CN108361006A - A kind of water drainage-gas recovery technology method using preset pneumatic type tubing string - Google Patents

Abstract

The present invention provides a kind of water drainage-gas recovery technology method using preset pneumatic type tubing string, belong to natural gas extraction technical field, by the way that preset pneumatic type tubing string is arranged in gas-producing well, and realize that the insertion of preset pneumatic type tubing string seals using the interference fit for being inserted into seal modules and between the preset sealing drum of internal surface of sleeve pipe, and according to the relationship between the shaft bottom hydrops height and preset height threshold value of gas-producing well, automatically switch the gas production function and water pumping gas production function of preset pneumatic type tubing string, handover operation between function is to be automatically brought into operation, handover operation is simple and function switch is timely, i.e. the water drainage-gas recovery technology method is not only easy to operate, and adaptability is extensive and process costs are low, and there is lower energy consumption, pollution of the water pumping gas production in the process to stratum can also be reduced simultaneously.

Description

A kind of drainage and gas recovery technology method using preset pneumatic pipe string

technical field

The invention relates to the technical field of natural gas exploitation, in particular to a drainage gas recovery process method using a preset pneumatic pipe string.

Background technique

With the rapid development of the global economy, the demand for resources is increasing day by day. Oil and gas resources, known as one of the three major energy sources, are in tight demand. Seeking an economical and effective way to develop oil and gas resources has become the theme of current oil field development. .

After the gas well was put into production, Qijing’s gas production and pressure dropped rapidly, which led to insufficient liquid carrying capacity of the gas well. With the prolongation of production time, the number of liquid-loaded gas wells in the gas field increased year by year, and the bottom-hole liquid accumulation became more and more serious. The contradiction between the normal production of gas wells and the solution to the problem of wellbore fluid accumulation has become increasingly prominent. Low production capacity and high liquid accumulation in gas wells have become the key factors restricting the production economy of gas wells, and large-scale drainage and gas recovery have become an effective means to solve this problem.

At present, the main drainage measures include foam drainage, concentric capillary tube technology, vortex drainage, coiled tubing drainage, natural gas continuous circulation, velocity string drainage, plunger gas lift, deep pumping drainage, interconnected wellbore drainage, multi-stage section Flow valve mutual aid liquid drainage, nitrogen injection, small diameter pipe gas production, slimhole well drilling and production technology, optimized pipe string gas production, gas well deep drainage, electric submersible pump, jet pump, combination of foam row and other processes, etc., these processes Although the technology plays an important role in drainage and gas recovery and fluid drainage and production resumption of gas wells shut down due to fluid accumulation with their respective advantages, there are common problems such as complex operation, poor applicability, high process cost, and high energy consumption. Therefore, it is urgent to develop a water drainage gas recovery process method with simple operation, wide adaptability, low process cost and low energy consumption.

Contents of the invention

In view of the above problems, the present invention provides a drainage and gas recovery process using a preset pneumatic string, aiming to provide a drainage and gas recovery process with simple operation, wide adaptability, low process cost, and low energy consumption. It can also reduce the pollution to the formation in the process of drainage and gas recovery. The technical scheme provided by the invention is as follows:

The present invention provides a drainage gas recovery process method using a preset pneumatic pipe string, and the drainage gas recovery process method includes:

Install the preset pneumatic string in the gas production well, and use the interference fit between the insertion sealing module and the preset sealing cylinder installed on the inner wall of the casing to realize the insertion seal of the preset pneumatic string;

Judging whether the height of the bottomhole fluid accumulation of the gas production well is greater than a preset height threshold;

If the height of the bottomhole liquid accumulation of the gas production well is not greater than the preset height threshold, the pneumatic reversing module is turned on to allow the formation gas to enter the pneumatic reversing module, and then the formation gas is discharged to the wellhead through the oil casing annulus , to realize the function of gas extraction;

If the height of the bottom-hole fluid accumulation of the gas production well is greater than the preset height threshold, switch the pneumatic reversing module so that the formation gas enters the pneumatic reversing module, and drive the gas-liquid pressurization module to work, and then pass through the oil jacket The annulus discharges the formation gas to the wellhead, and discharges the bottomhole fluid to the wellhead through the tubing, so as to realize the function of drainage and gas recovery.

Optionally, the preset pneumatic string is installed in the gas production well, and the insertion of the preset pneumatic string is realized by using the interference fit between the insertion sealing module and the preset sealing cylinder installed on the inner wall of the casing seal, specifically:

The preset pneumatic string composed of the gas-liquid pressurization module, the pneumatic reversing module and the insertion sealing module is lowered to the bottom of the gas production well by tubing, and the bottom hole screen of the preset pneumatic string is inserted into the In the bottom fluid;

The insertion seal of the preset pneumatic pipe string is realized by using the interference fit between the rubber ring inserted into the sealing module and the sealing cylinder preset on the inner wall of the casing through vulcanization.

Optionally, if the height of the bottomhole fluid accumulation of the gas production well is not greater than the preset height threshold, the pneumatic reversing module is turned on to allow formation gas to enter the pneumatic reversing module, and then the gas is transferred through the oil casing annulus. The above-mentioned formation gas is discharged to the wellhead to realize the function of gas recovery, specifically:

If the height of the bottomhole fluid accumulation of the gas production well is not greater than the preset height threshold, the formation high-pressure gas enters the oil casing annulus inserted below the sealing module through multiple perforations evenly arranged in the middle of the casing;

The formation high-pressure gas that enters the annulus of the oil jacket inserted under the sealing module enters the pneumatic reversing module through the gas inlet of the air motor piston, drives the reversing valve core to perform a reciprocating linear motion in the gap, and realizes opening the pneumatic reversing module so that the formation gas enters the The pneumatic reversing module discharges the formation gas to the wellhead through the oil casing annulus to realize the gas production function.

Optionally, if the height of bottomhole fluid accumulation of the gas production well is greater than the preset height threshold, the pneumatic reversing module is switched to allow formation gas to enter the pneumatic reversing module, and the gas-liquid pressurization module is driven work, and then discharge the formation gas to the wellhead through the oil casing annulus, and discharge the bottomhole fluid to the wellhead through the tubing, so as to realize the drainage and gas recovery function, specifically including:

If the height of the bottom hole liquid accumulation of the gas production well is greater than the preset height threshold, the formation high-pressure gas enters the oil casing annulus inserted below the sealing module through multiple perforations evenly arranged in the middle of the casing;

A part of formation high-pressure gas entering the annulus of the oil jacket inserted under the sealing module enters the pneumatic reversing module through the gas inlet of the air motor piston, and drives the reversing valve core to perform a reciprocating linear motion in the gap to realize the reversing function;

Another part of formation high-pressure gas entering the annulus of the oil jacket inserted under the sealing module enters the gas-liquid pressurization module through the power gas inlet, and drives the pneumatic piston to make reciprocating linear motion, and then drives the upper liquid piston and the lower liquid piston to reciprocate linear motion;

The upper liquid piston makes a reciprocating linear motion to suck the annular liquid in the oil jacket above the sealing module into the central pipe string through the annular liquid inlet, and then discharge the annular liquid to the bottom of the well through the bottom hole screen;

The lower liquid piston makes a reciprocating linear motion to suck the bottom-hole liquid into the central pipe string through the bottom-hole screen;

Through the oil pipe inserted above the sealing module, the liquid sucked into the central string is discharged to the wellhead to realize the drainage function;

Formation high-pressure gas that enters the central pipe string through the air motor piston gas inlet and power gas inlet, drives the reversing valve core and pneumatic piston, and then discharges through the exhaust gas outlet to the oil jacket annulus above the insertion sealing module, and passes through the oil jacket The annulus discharges the formation gas to the wellhead for gas production.

Optionally, the pneumatic reversing module drives the reversing valve core to perform gap reciprocating linear motion to realize the reversing function, specifically:

Formation high-pressure gas enters the lower chamber of the air motor piston through the gas inlet of the air motor piston, and at the same time, the formation high-pressure gas in the lower chamber of the air motor piston enters the upper chamber of the air motor piston through the gas channel on the side of the motor piston;

The air motor piston moves downward from the top dead center under the action of the differential pressure of the high-pressure gas in the formation, and drives the reversing piston coaxially and fixedly connected with the air motor piston to move downward;

When the reversing piston moves to the bottom of the buffer cylinder, the reversing piston drives the buffer cylinder to continue to move downward, and then the buffer cylinder drives the reversing valve spool that is fixedly connected with it coaxially to move downward, realizing that the reversing valve spool moves from up to down. Position switch to down position;

When the starter motor piston moves to the bottom dead point, the upper slot of the air motor piston connecting rod communicates with the lower chamber of the air motor piston and the slide valve chamber, and the formation high-pressure pneumatic enters the slide valve chamber through the upper slot of the air motor piston connecting rod chamber, the slide valve starts to move upward from the bottom dead center under the action of the differential pressure force generated by the high-pressure gas in the formation;

When the slide valve moves to the top dead center, the slide valve blocks the passage between the lower chamber of the pneumatic piston and the side gas passage of the air motor piston, and then under the action of the pressure difference, the air motor piston starts to move from the bottom dead center Up movement, and drive the reversing piston to move up;

When the reversing piston moves upwards to the top of the buffer cylinder, it drives the buffer cylinder to move upwards, and the buffer cylinder drives the reversing valve core to move upwards to realize the switching of the reversing valve spool from the lower position to the upper position.

The present invention has at least the following beneficial effects:

The invention provides a drainage and gas recovery process method using a preset pneumatic pipe string, by setting a preset pneumatic pipe string in a gas production well, and adopting the method of inserting a sealing module and a preset sealing cylinder installed on the inner wall of the casing The interference fit between the preset pneumatic strings can realize the insertion and sealing of the preset pneumatic strings, and automatically switch the gas production function and drainage of the preset pneumatic strings according to the relationship between the bottomhole fluid height of the gas production well and the preset height threshold Gas extraction function, the switching operation between functions is automatic operation, the switching operation is simple and the function switching is timely, that is, the drainage gas recovery process method is not only simple to operate, but also has wide adaptability and low process cost, and has low energy consumption. It can also reduce the pollution to the formation in the process of drainage and gas recovery.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic flow chart of a drainage and gas recovery process method using a preset pneumatic string provided by an embodiment of the present invention;

Fig. 2 is a schematic structural view of a preset pneumatic string provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a gas-liquid booster module provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a gas-liquid pressurization module provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a pneumatic reversing module provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a pneumatic reversing module provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of an insertion sealing module provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of an insertion sealing module provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "Eighth", etc., if present, are used to distinguish similar items and are not necessarily used to describe a particular order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Referring to Fig. 1 to Fig. 8, a drainage and gas recovery process using a preset pneumatic string according to an embodiment of the present invention will be described in detail.

Referring to Fig. 1, a drainage and gas recovery process using a preset pneumatic string according to an embodiment of the present invention includes:

Step 110: Install the preset pneumatic string in the gas production well, and implement the insertion seal of the preset pneumatic string by using the interference fit between the insertion sealing module and the preset sealing cylinder installed on the inner wall of the casing.

Referring to FIG. 2 , the preset pneumatic string used in the embodiment of the present invention includes a casing 1 , a sealing cylinder 2 , a perforation 3 , a gas-liquid booster module 4 , a pneumatic reversing module 5 and an insertion sealing module 6 . Among them, the casing 1 is fixed on the inner wall of the gas well through the cementing process, and the preset sealing cylinder 2 is a cylindrical rubber ring, which is embedded in the groove at the upper position of the inner wall of the casing 1 in advance through vulcanization, and the multiple perforations 3 are uniform Arranged in the middle of the casing 1, the center pipe string is fixedly connected by inserting the sealing module 6, the pneumatic reversing module 5 and the gas-liquid booster module 4 from top to bottom through threads, and the oil pipe joint 6.9 on the upper part of the center pipe string is threaded with The upper oil pipe is fixedly connected, and the rubber ring 6.5 inserted into the sealing module 6 and the preset sealing cylinder 2 are sealed by interference fit, and the bottom hole screen 4.17 at the bottom of the central string is inserted into the bottom hole fluid to realize the bottom hole fluid accumulation discharge.

Among them, referring to Fig. 3 and Fig. 4, the gas-liquid booster module 4 is mainly composed of the lower liquid piston 4.1, the middle section of the bottom fluid flow channel 4.2, the upper liquid piston 4.3, the integrated piston rod 4.4, the pneumatic piston 4.5, the flow channel Conversion plate 4.6, upper cylinder of pneumatic piston 4.7, middle cylinder of pneumatic piston 4.8, lower section of annular liquid flow path 4.9, lower cylinder of pneumatic piston 4.10, first check valve 4.11, upper cylinder of liquid piston 4.12, lower end cover of liquid piston cylinder 4.13, The second one-way valve 4.14, the liquid piston lower cylinder 4.15, the liquid piston cylinder cover 4.16, the bottom hole screen 4.17, the third one-way valve 4.18, the lower section of the first well bottom fluid flow channel 4.19, and the fourth one-way valve 4.20 , Bottomhole fluid conversion channel 4.21, power gas channel lower section 4.22, power gas channel lower section 4.23, fifth check valve 4.24, second bottomhole fluid channel lower section 4.25, sixth one-way valve 4.26.

Wherein, as shown in Fig. 5 and Fig. 6, the pneumatic reversing module 5 is mainly composed of the upper section 5.1 of the first power gas passage, the reversing cylinder 5.2, the upper section 5.3 of the second power gas passage, the end cover 5.4 of the reversing cylinder, and the reversing valve core. 5.5, reversing valve core connecting rod 5.6, buffer cylinder 5.7, reversing piston 5.8, reversing piston connecting rod 5.9, slide valve side gas channel 5.10, slide valve 5.11, air motor piston side gas channel 5.12, air motor piston Cylinder 5.13, air motor piston 5.14, air motor piston connecting rod 5.15, air motor piston connecting rod upper groove 5.16, air motor piston gas inlet 5.17, air motor piston lower cylinder 5.18, slide valve upper cylinder sleeve 5.19, slide valve lower cylinder Sleeve 5.20, slide valve base 5.21, air motor base 5.22, buffer outer cylinder 5.23, idle power gas discharge channel 5.24, buffer outer cylinder end cover 5.25, reversing valve core reversing channel 5.26, power gas inlet 5.27, reversing cylinder 5.28 , Middle section 5.29 of the second power gas channel, power gas reversing channel 5.30, upper section 5.31 of the bottom fluid flow channel, 5.32 lower chamber of the slide valve base, 5.33 slide valve chamber, upper section 5.34 of the annular liquid flow channel and the piston connection of the air motor The lower part of the rod is slotted 5.35 to form.

Referring to Figure 7 and Figure 8, the insertion sealing module 6 is mainly composed of a dead power gas conduit 6.1, an insertion sealer main body 6.2, an insertion sealer lower end cover 6.3, an insertion sealer lower piston 6.4, a rubber ring 6.5, and an insertion sealer upper piston 6.6, insert the upper end cover of the sealer 6.7, exhaust gas outlet 6.8, oil pipe joint 6.9, annular liquid conduit 6.10, insert the lower spring of the sealer 6.11, insert the lower through hole of the sealer 6.12, insert the upper through hole of the sealer 6.13, insert the seal The upper spring 6.14, the annular liquid inlet 6.15 and the insert sealer housing 6.16 are composed.

Specifically, the preset pneumatic string composed of the gas-liquid pressurization module 4, the pneumatic reversing module 5 and the insertion sealing module 6 is lowered to the bottom of the gas production well by tubing, and the bottom of the preset pneumatic string is The screen pipe is inserted into the bottom hole liquid; then the rubber ring 6.5 inserted into the sealing module 6 and the sealing cylinder 2 preset on the inner wall of the casing 1 through vulcanization are used for interference fit to realize the preset pneumatic string insert seal.

Step 120: Judging whether the height of the bottomhole fluid accumulation of the gas production well is greater than a preset height threshold.

Specifically, by presetting the liquid level sensor at the bottom of the well to detect the height of the bottom hole liquid accumulation, it is automatically judged whether the bottom hole liquid accumulation height of the gas production well is greater than the preset height threshold. Wherein, the embodiment of the present invention does not specifically limit the setting of the specific size of the preset height threshold. For example, the preset height threshold may be 1 meter.

Step 130: If the height of the bottomhole fluid accumulation of the gas production well is not greater than the preset height threshold, turn on the pneumatic reversing module to allow the formation gas to enter the pneumatic reversing module, and then pass the formation gas through the oil casing annulus It is discharged to the wellhead to realize the function of gas recovery.

Specifically, if the bottomhole liquid accumulation height of the gas-producing well is not greater than the preset height threshold, formation high-pressure gas enters the oil casing annulus below the insertion sealing module through multiple perforations evenly arranged in the middle of the casing; The formation high-pressure gas in the oil jacket annulus enters the pneumatic reversing module through the gas inlet of the air motor piston, and drives the reversing valve core to perform gap reciprocating linear motion to realize the opening of the pneumatic reversing module so that the formation gas enters the pneumatic reversing module, and then passes through the pneumatic reversing module. The oil casing annulus discharges the formation gas to the wellhead to realize the function of gas production.

Further, as shown in Fig. 2 to Fig. 8, if the height of bottomhole fluid accumulation of the gas production well is not greater than the preset height threshold, formation high-pressure gas enters the insertion sealing module 6 through the multiple perforations 3 evenly arranged in the middle of the casing 1 The oil jacket annulus at the bottom is inserted into the oil jacket annulus below the sealing module 6. The formation high-pressure gas enters the pneumatic reversing module 5 through the gas inlet 5.17 of the air motor piston, and drives the reversing valve core 5.5 to move back and forth in a straight line to realize the opening of the pneumatic reversing The module 5 allows the formation gas to enter the pneumatic reversing module, and then discharges the formation gas to the wellhead through the oil casing annulus to realize the gas production function.

Step 140: If the height of the bottomhole fluid accumulation of the gas production well is greater than the preset height threshold, switch the pneumatic reversing module to allow formation gas to enter the pneumatic reversing module, and drive the gas-liquid booster module to work, and then The formation gas is discharged to the wellhead through the oil casing annulus, and the bottomhole fluid is discharged to the wellhead through the tubing, so as to realize the function of water drainage and gas recovery.

Specifically, if the height of the bottomhole liquid accumulation of the gas producing well is greater than the preset height threshold, the formation high-pressure gas enters the oil casing annulus under the insertion sealing module through the multiple perforations evenly arranged in the middle of the casing; Part of the formation high-pressure gas in the oil jacket annulus enters the pneumatic reversing module through the gas inlet of the air motor piston, and drives the reversing valve core to perform a reciprocating linear motion in the gap to realize the reversing function; it enters the other part of the oil jacket annulus inserted under the sealing module Formation high-pressure gas enters the gas-liquid pressurization module through the power gas inlet, and drives the pneumatic piston to make reciprocating linear motion, and then drives the upper liquid piston and the lower liquid piston to reciprocate linear motion; The annulus liquid in the oil casing is sucked into the central pipe string through the annulus liquid inlet, and then discharged to the bottom of the well through the bottom hole screen; The liquid sucked into the central pipe string is discharged to the wellhead through the oil pipe inserted into the sealing module to realize the drainage function; the formation high-pressure gas entering the central pipe string through the gas inlet of the air motor piston and the power gas inlet drives the reversing valve core and the pneumatic The piston is then discharged to the oil jacket annulus above the insertion sealing module through the exhaust gas outlet, and the formation gas is discharged to the wellhead through the oil jacket annulus to realize the gas recovery function.

Further, the formation high-pressure gas enters the lower chamber of the air motor piston through the gas inlet of the air motor piston, and at the same time, the formation high-pressure gas in the lower chamber of the air motor piston enters the upper chamber of the air motor piston through the gas channel on the side of the motor piston; Under the action of the pressure difference of the gas, it starts to move downward from the top dead center, and drives the reversing piston coaxially and fixedly connected with the air motor piston to move downward; when the reversing piston moves to the bottom of the buffer cylinder, the reversing piston drives The buffer cylinder continues to move downward, and then the buffer cylinder drives the spool of the reversing valve fixedly connected with the same axis to move downwards, realizing the switching of the spool of the reversing valve from the upper position to the lower position; when the piston of the air motor moves to the bottom dead point At the same time, the upper slot of the air motor piston connecting rod is connected with the lower chamber of the air motor piston and the slide valve chamber, and the formation high-pressure air enters the slide valve chamber through the upper slot of the air motor piston connecting rod, and the slide valve is generated by the high-pressure gas in the formation. Under the action of the pressure difference force, it starts to move upward from the bottom dead center; when the slide valve moves to the top dead point, the slide valve blocks the passage between the lower chamber of the pneumatic piston and the side gas passage of the air motor piston, and then Under the action of differential force, the piston of the air motor moves upward from the bottom dead center, and drives the reversing piston to move upward; when the reversing piston moves upward to the top of the buffer cylinder, it drives the buffer cylinder to move upward, and the buffer cylinder drives the reversing valve The spool moves upward to realize switching of the reversing valve spool from the lower position to the upper position.

Further, as shown in Fig. 2 to Fig. 8, if the height of the bottomhole fluid accumulation of the gas production well is greater than the preset height threshold, the formation high-pressure gas enters under the sealing module 6 through the multiple perforations 3 evenly arranged in the middle of the casing 1 The formation high-pressure gas inserted into the oil jacket annulus below the sealing module 6 enters the pneumatic reversing module 5 through the air motor piston gas inlet 5.17, and drives the reversing valve core 5.5 to reciprocate and linearly move in a gap to realize the reversing function; The formation high-pressure gas inserted into the air of the oil sleeve ring below the sealing module 6 enters the gas-liquid pressurization module 4 through the power gas inlet 5.27, and drives the pneumatic piston 4.5 to perform reciprocating linear motion, thereby driving the upper liquid piston 4.3 and the upper liquid piston 4.3 coaxially fixed with the pneumatic piston 4.5. The lower liquid piston 4.1 makes a reciprocating linear motion, and the upper liquid piston 4.3 makes a reciprocating linear motion to draw the oil casing annular liquid inserted above the sealing module 6 into the central pipe string through the annulus liquid inlet 6.15, and pass through the bottom hole screen 4.17 to hold the annulus. Empty liquid is discharged to the bottom of the well, and the lower liquid piston 4.1 performs reciprocating linear motion to suck the bottom-hole liquid into the central pipe string through the bottom-hole screen 4.17, and discharge it to the wellhead through the oil pipe inserted into the top of the sealing module 6 to realize the drainage function; The air motor piston gas inlet 5.17 and the power gas inlet 5.27 enter the formation high-pressure gas in the central pipe string, drive the reversing valve core and the pneumatic piston, and discharge it through the dead power gas outlet 6.8 to the oil jacket annulus inserted above the sealing module 6, and The oil casing annulus inserted above the sealing module 6 is discharged to the wellhead to realize the gas recovery function.

Moreover, in the pre-set pneumatic pipe string used in the drainage and gas recovery process method using the preset pneumatic pipe string in the embodiment of the present invention, a plurality of side holes of the bottom-hole screen pipe are evenly arranged in the middle of the side of the bottom-hole screen pipe 4.17, The side hole of the bottom hole screen is a through hole with a certain inclination angle. When the bottom hole liquid is sucked into the central pipe string through the bottom hole screen 4.17, it can form a swirling flow, so that the sand and gravel in the bottom hole liquid will settle to the bottom hole screen. The center of the bottom surface of the pipe 4.17 is discharged to the bottom of the well through the bottom holes of the bottom surface of the bottom hole screen 4.17 evenly arranged at the center of the bottom surface of the bottom hole screen 4.17 to realize the sand control function.

Referring to Figures 2 to 8, when the formation high-pressure gas enters from the lower section 4.23 of the second power gas channel, the formation high-pressure gas enters the lower chamber of the pneumatic piston 4.5 through the through hole at the lower right of the pneumatic piston 4.5, thereby pushing the pneumatic piston 4.5 toward The upward movement drives the upper liquid piston 4.3 and the lower liquid piston 4.1 coaxially fixed with the pneumatic piston 4.5 to move upward, and the idle gas in the upper chamber of the pneumatic piston 4.5 enters the lower section of the first power gas channel through the upper left hole of the pneumatic piston 4.5 4.22, and then discharged to the pneumatic reversing module 5.

Referring to Figures 2 to 8, due to the upward movement of the upper liquid piston 4.3, the idle gas in the upper chamber of the upper liquid piston 4.3 enters the lower section 4.22 of the first power gas passage through the upper left hole of the upper liquid piston 4.3, and then is discharged to the pneumatic converter. To the module 5, the lower chamber of the upper liquid piston 4.3 forms a low-pressure area, and the annular liquid above the second check valve 4.14 in the lower section 4.9 of the annular liquid passage enters the lower chamber of the upper liquid piston 4.3 through the lower right through hole of the upper liquid piston 4.3.

Referring to Figures 2 to 8, due to the upward movement of the lower liquid piston 4.1, the bottom well fluid in the upper chamber of the lower liquid piston 4.1 enters the lower section 4.25 of the second bottom well fluid channel through the upper right hole of the lower liquid piston 4.1, Then the bottom hole fluid in the upper chamber of the lower liquid piston 4.1 passes through the fifth one-way valve 4.24, and is discharged to the pneumatic reversing module 5 through the bottom hole fluid conversion channel 4.21, and the lower chamber of the lower liquid piston 4.1 forms a low-pressure area. Bottomhole fluid enters the lower section 4.19 of the first bottomhole fluid channel through the bottomhole screen 4.17 and the third one-way valve 4.18, and enters the lower cavity of the lower liquid piston 4.1 through the lower left through hole of the lower liquid piston 4.1.

Referring to Figures 2 to 8, when the formation high-pressure gas enters from the lower section 4.22 of the first power gas channel, the formation high-pressure gas enters the upper chamber of the pneumatic piston 4.5 through the upper left hole of the pneumatic piston 4.5, thereby pushing the pneumatic piston 4.5 downward movement, and then drives the upper liquid piston 4.3 and the lower liquid piston 4.1 coaxially fixed with the pneumatic piston 4.5 to move downward, and the exhaust gas in the lower chamber of the pneumatic piston 4.5 enters the lower section 4.23 of the power gas channel B through the through hole at the lower right of the pneumatic piston 4.5, Then it is discharged to the pneumatic reversing module 5.

Referring to Figures 2 to 8, due to the downward movement of the upper liquid piston 4.3, the annular liquid in the lower chamber of the upper liquid piston 4.3 enters the lower section 4.22 of the first power gas channel through the lower right hole of the upper liquid piston 4.3, and then passes through the second The one-way valve 4.14 and the bottom hole screen 4.17 are discharged to the bottom of the well, and the upper chamber of the upper liquid piston 4.3 forms a low-pressure area, and the high-pressure gas in the lower section 4.22 of the first power gas channel enters the upper liquid through the upper left hole of the upper liquid piston 4.3 Piston 4.3 upper chamber,

Referring to Figures 2 to 8, due to the downward movement of the lower liquid piston 4.1, the bottom hole fluid in the lower chamber of the lower liquid piston 4.1 enters the lower section 4.19 of the first bottom fluid flow channel through the lower left through hole of the lower liquid piston 4.1 , then the bottom hole fluid in the lower cavity of the lower liquid piston 4.1 passes through the fourth check valve 4.20, and is discharged to the pneumatic reversing module 5 through the bottom fluid fluid conversion channel 4.21, and the upper cavity of the lower liquid piston 4.1 forms a low-pressure area , the bottom hole liquid enters the second bottom hole liquid flow path lower section 4.25 through the bottom hole screen 4.17 and the sixth check valve 4.26, and enters the lower liquid piston 4.1 upper chamber through the upper right through hole of the lower liquid piston 4.1.

In particular, there are three pneumatic pistons 4.5 at the power end, one lower liquid piston 4.1 and one upper liquid piston 4.3 at the liquid end, and the area of the pneumatic piston is larger than that of the liquid piston 4.1 and the upper liquid piston 4.3, so the effective area of the pneumatic piston 4.5 at the power end It is larger than the effective area of the lower liquid piston 4.1 and the upper liquid piston 4.3 of the liquid end, so the integrated piston has a gas-liquid pressurizing effect.

Referring to Figures 2 to 8, the air motor piston 5.14 is initially at the top dead center, and formation high-pressure gas enters the lower chamber of the air motor piston 5.14 through the gas inlet 5.17 of the air motor piston, while the formation high-pressure gas in the lower chamber of the air motor piston 5.14 passes through The air channel 5.12 on the side of the air motor piston enters the upper cavity of the air motor piston 5.14. Since the upper surface area of the air motor piston 5.14 is larger than the lower surface area, the total pressure acting on the upper surface of the air motor piston 5.14 is greater than the total pressure on the lower surface, so the air motor piston 5.14 starts to move downward from the top dead center, and the downward movement of the air motor piston 5.14 drives the reversing piston 5.8, which is coaxially and fixedly connected with the air motor piston 5.14, to move downward. When the reversing piston 5.8 moves to the bottom of the buffer cylinder 5.7, the reversing piston The piston 5.8 drives the buffer cylinder 5.7 to continue to move downward, and the downward movement of the buffer cylinder 5.7 drives the reversing valve core 5.5 coaxially fixedly connected with the buffer cylinder 5.7 to move downward. At this time, the reversing valve core 5.5 is switched from the upper position to the lower position. Location.

Referring to Figures 2 to 8, when the air motor piston 5.14 moves to the bottom dead center, the upper groove 5.16 of the air motor piston connecting rod communicates with the lower chamber of the air motor piston 5.14 and the slide valve chamber 5.33, and the formation high-pressure gas passes through the pneumatic The groove 5.16 on the upper part of the motor piston rod enters the spool valve chamber 5.33 from the lower chamber of the air motor piston 5.14. Since the upper surface area of the spool valve 5.11 is smaller than the lower surface area, the total pressure acting on the upper surface of the spool valve 5.11 is smaller than the total pressure on the lower surface. Therefore, the spool valve 5.11 starts to move upward from the bottom dead center. When the spool valve 5.11 moves to the top dead center, the spool valve 5.11 blocks the passage between the lower cavity of the air motor piston 5.14 and the air passage 5.12 on the side of the air motor piston. The upper chamber of the air motor piston 5.14 communicates with the air passage 5.12 on the side of the air motor piston, the annular space in the middle of the slide valve 5.11, the air passage 5.10 on the side of the slide valve and the lower chamber 5.32 of the slide valve base, and the lower chamber 5.32 of the slide valve base passes through the slide valve base 5.21 The through hole on the lower right is connected with the idle gas discharge channel 5.24. The pressure of the idle gas is lower than that of the formation high-pressure gas. Under the action of the pressure difference, the air motor piston 5.14 moves upward from the bottom dead center, and the air motor piston 5.14 moves upward Drive the reversing piston 5.8 coaxially fixedly connected with the air motor piston 5.14 to move upward, when the reversing piston 5.8 moves to the top of the buffer cylinder 5.7, the reversing piston 5.8 drives the buffer cylinder 5.7 to continue to move upward, and the upward movement of the buffer cylinder 5.7 drives the The reversing spool 5.5 that is fixedly connected with the buffer cylinder 5.7 moves upwards, and now the reversing spool 5.5 is switched from the lower position to the upper position.

Referring to Figures 2 to 8, when the air motor piston 5.14 moves to the top dead point again, the slot 5.35 in the lower part of the air motor piston connecting rod communicates with the spool valve chamber 5.33 and the spool valve base lower cavity 5.32, at this time the spool valve The upper surface of 5.11 is still formation high-pressure gas, and the lower surface of slide valve 5.11 is idle power gas. The pressure of idle power gas is lower than that of formation high-pressure gas. Periodic pneumatic reversing function.

Referring to Figures 2 to 8, the top of the insertion sealing module 6 is fixedly connected with the oil pipe through threads, and the middle part of the insertion sealing module 6 is sealed by interference fit with the preset sealing cylinder 2 through a plurality of uniformly arranged rubber rings 6.5. The sealing cylinder 2 is embedded in the inner wall of the casing 1 in advance through vulcanization, and the inner diameter of the preset sealing cylinder 2 is smaller than the inner diameter of the casing 1, which is convenient for inserting the sealing module 6 into the sealing position, inserting the sealing module 6 below and the pneumatic reversing module 5 through the thread Fixed connection.

Further, as shown in Fig. 2 to Fig. 8, the gas-liquid channel mainly includes the annular liquid flow channel, the bottomhole liquid flow channel and the gas channel; in the annular liquid flow channel, the oil jacket annular space above the sealing module 6 The liquid enters the annular liquid conduit 6.10 through the annular liquid inlet 6.15, and then the annular liquid enters the upper section 5.34 of the annular liquid flow channel that is connected with the annular liquid conduit 6.10 through screw connections, and the annular liquid continues to enter the upper section of the annular liquid flow channel. 5.34 is connected to the lower section 4.9 of the annular space liquid channel, and is discharged to the bottom of the well through the bottom hole screen 4.17.

Referring to Figures 2 to 8, in the bottomhole fluid flow channel, the bottomhole fluid passes through the bottom hole screen 4.17 and enters the lower section 4.19 of the first bottomhole fluid channel and the lower section 4.25 of the second bottomhole fluid channel, Then the bottomhole fluid enters the middle section 4.2 of the bottomhole fluid channel through the bottomhole fluid conversion channel 4.21, and then the bottomhole fluid enters the bottom hole fluid channel upper section 5.31 through the bottomhole fluid conversion channel, and passes through the tubing Discharge to the wellhead.

Referring to Figures 2 to 8, in the gas channel, when the reversing valve core 5.5 is located at the upper position, formation high-pressure gas enters the central pipe string through the power gas inlet 5.27, and enters the first reversing channel 5.26 through the reversing valve core. The upper section 5.3 of the second power gas channel, then the formation high-pressure gas enters the middle section 5.29 of the second power gas channel through the power gas reversing channel 5.30, and enters the lower section 4.23 of the second power gas channel through the flow channel conversion channel, and then the formation high-pressure gas passes through the pneumatic piston 4.5 The side through hole enters the lower chamber of the pneumatic piston 4.5, thereby pushing the pneumatic piston 4.5 to move upward, and the idle power gas in the upper chamber of the pneumatic piston 4.5 enters the lower section 4.22 of the first power gas channel through the side through hole of the pneumatic piston 4.5, and enters the The lower section of the first motive gas channel 4.22 is connected to the upper section 5.1 of the first motive gas channel, and then the idle power gas enters the idle power gas discharge channel 5.24 through the reversing channel 5.26 of the reversing valve core, and passes through the idle power gas conduit 6.1 and the idle power gas in sequence. Outlet 6.8 discharges the dead gas to the oil jacket annulus inserted above the sealing module 6, and discharges to the wellhead through the oil jacket annulus inserted above the sealing module 6.

Referring to Figures 2 to 8, when the reversing valve core 5.5 is at the lower position, formation high-pressure gas enters the central pipe string through the power gas inlet 5.27, and enters the upper section of the first power gas channel through the reversing channel 5.26 of the reversing valve core 5.1, then the formation high-pressure gas enters the lower section 4.22 of the first power gas passage connected to the upper section 5.1 of the first power gas passage, and then the formation high-pressure gas enters the upper chamber of the pneumatic piston 4.5 through the side hole of the pneumatic piston 4.5, thereby pushing the pneumatic piston 4.5 Moving downwards, the idle gas in the lower chamber of the pneumatic piston 4.5 enters the lower section 4.23 of the second motive gas channel through the side hole of the pneumatic piston 4.5, and enters the middle section 5.29 of the second motive gas channel through the channel conversion channel, and then the exhaust gas passes through The power gas reversing channel 5.30 enters the upper section 5.3 of the second power gas channel, and enters the exhaust gas discharge channel 5.24 through the reversing channel 5.26 of the reversing valve core, and then passes through the exhaust gas conduit 6.1 and the exhaust gas outlet 6.8 in sequence to discharge the idle gas The power gas is discharged into the annulus of the oil jacket inserted above the sealing module 6 , and discharged to the wellhead through the annulus of the oil jacket inserted above the sealing module 6 .

The invention provides a drainage and gas recovery process method using a preset pneumatic pipe string, by setting a preset pneumatic pipe string in a gas production well, and adopting the method of inserting a sealing module and a preset sealing cylinder installed on the inner wall of the casing The interference fit between the preset pneumatic strings can realize the insertion and sealing of the preset pneumatic strings, and automatically switch the gas production function and drainage of the preset pneumatic strings according to the relationship between the bottomhole fluid height of the gas production well and the preset height threshold Gas extraction function, the switching operation between functions is automatic operation, the switching operation is simple and the function switching is timely, that is, the drainage gas recovery process method is not only simple to operate, but also has wide adaptability and low process cost, and has low energy consumption. It can also reduce the pollution to the formation in the process of drainage and gas recovery.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (5)

1. a kind of water drainage-gas recovery technology method using preset pneumatic type tubing string, which is characterized in that the water drainage-gas recovery technology side Method includes：

Preset pneumatic type tubing string is mounted in gas-producing well, and using insertion seal modules and mounted on the preset close of internal surface of sleeve pipe Interference fit between sealed tube realizes the insertion sealing of preset pneumatic type tubing string；

Judge whether the shaft bottom hydrops height of the gas-producing well is more than preset height threshold value；

If the shaft bottom hydrops height of the gas-producing well is not more than preset height threshold value, pneumatic inverting module is opened so that formation gas Body enters the pneumatic inverting module, and then the formation gas is discharged to well head by oil jacket annular space, to realize gas production work( Energy；

If the shaft bottom hydrops height of the gas-producing well is more than preset height threshold value, switch the pneumatic inverting module so that stratum Gas enters the pneumatic inverting module, and gas-liquid pressure-boosting module is driven to work, and then by oil jacket annular space by the formation gas Body is discharged to well head, and the shaft bottom hydrops is discharged to well head by oil pipe, to realize water pumping gas production function.

2. water drainage-gas recovery technology method according to claim 1, which is characterized in that described to install preset pneumatic type tubing string It is realized in advance in gas-producing well, and using the interference fit for being inserted into seal modules and between the preset sealing drum of internal surface of sleeve pipe The insertion sealing of pneumatic type tubing string is set, specially：

By gas-liquid pressure-boosting module, pneumatic inverting module and the preset pneumatic type tubing string of seal modules composition is inserted into using oil pipe decentralization To gas-producing well shaft bottom, and the bottom shaft bottom screen casing of the preset pneumatic type tubing string is inserted into the hydrops of shaft bottom；

It is preset between the sealing drum of internal surface of sleeve pipe in advance using the rubber ring for being inserted into seal modules and by sulfurization Interference fit, realize preset pneumatic type tubing string insertion sealing.

3. water drainage-gas recovery technology method according to claim 1, which is characterized in that if the shaft bottom product of the gas-producing well Liquid height be not more than preset height threshold value when, open pneumatic inverting module so that formation gas enter the pneumatic inverting module, And then the formation gas is discharged to by well head by oil jacket annular space, to realize gas production function, specially：

If the shaft bottom hydrops height of the gas-producing well is not more than preset height threshold value, stratum high pressure gas passes through in casing The multi-openings that portion is uniformly arranged enter the oil jacket annular space being inserted into below seal modules；

Stratum high pressure gas into the oil jacket annular space being inserted into below seal modules is entered by air motor piston gas entrance Pneumatic inverting module, driving reversing valve core carry out gap linear reciprocating motion, realize and open pneumatic inverting module so that formation gas Body enters the pneumatic inverting module, and then the formation gas is discharged to well head by oil jacket annular space, to realize gas production work( Energy.

4. water drainage-gas recovery technology method according to claim 1, which is characterized in that if the shaft bottom product of the gas-producing well When liquid height is more than preset height threshold value, switch the pneumatic inverting module so that formation gas enters the pneumatic commutation mould Block, and gas-liquid pressure-boosting module is driven to work, and then the formation gas is discharged to by well head by oil jacket annular space, and pass through oil The shaft bottom hydrops is discharged to well head by pipe, to realize water pumping gas production function, is specifically included：

If the shaft bottom hydrops height of the gas-producing well is more than preset height threshold value, stratum high pressure gas passes through uniform in the middle part of casing The multi-openings of setting enter the oil jacket annular space being inserted into below seal modules；

Partially layer high pressure gas into the oil jacket annular space being inserted into below seal modules is entered by air motor piston gas Mouth enters pneumatic inverting module, and driving reversing valve core carries out gap linear reciprocating motion, realizes commutation function；

Another part stratum high pressure gas into the oil jacket annular space being inserted into below seal modules is entered by power gas entrance Gas-liquid pressure-boosting module, and air rammer is driven to do linear reciprocating motion, and then it is past to drive upper liquid piston and lower liquid piston to do Linear motion；

The upper liquid piston does linear reciprocating motion and the oil jacket annulus fluid being inserted into above seal modules is passed through annulus fluid Entrance sucks center tubing string, and then annulus fluid is discharged to shaft bottom by shaft bottom screen casing；

The lower liquid piston does linear reciprocating motion and shaft bottom hydrops is sucked center tubing string by shaft bottom screen casing；

The liquid for sucking center tubing string is discharged to well head to realize drain function by being inserted into the oil pipe above seal modules；

Enter the stratum high pressure gas of center tubing string, driving commutation by air motor piston gas entrance and power gas entrance The oil jacket annular space above the insertion seal modules is discharged to by the outlet of weary power gas after spool and air rammer, passes through oil The formation gas is discharged to well head by set annular space, to realize gas production function.

5. water drainage-gas recovery technology method according to claim 4, which is characterized in that the pneumatic inverting module, driving are changed Gap linear reciprocating motion is carried out to spool, realizes commutation function, specially：

Stratum high pressure gas enters air motor piston cavity of resorption, while air motor piston by air motor piston gas entrance The stratum high pressure gas of cavity of resorption enters the epicoele of air motor piston by motor piston side gas passage；

Air motor piston moves downward under the pressure difference force effect of stratum high pressure gas since top dead-centre, and drive and institute The reversing piston that air motor piston coaxial is fixedly connected is stated to move downward；

When reversing piston moves to cushion dashpot bottom, reversing piston drives cushion dashpot to continue to move downward, and then cushion dashpot band It is dynamic that the change-over valve core being coaxially fixedly connected is driven to move downward, realize that change-over valve core switches to bottom from upper position It sets；

When starter motor piston motion is to bottom dead centre, the top fluting connection air motor piston of air motor piston rod Cavity of resorption and guiding valve chamber, stratum high-pressure pneumatic enter guiding valve chamber by the top fluting of air motor piston rod, and guiding valve exists Start to move upwards from bottom dead centre under the action of the difference force that stratum high pressure gas generates；

When sliding valve movement is to top dead-centre, the side gas passage of the cavity of resorption of jammed spool valve air rammer and pneumatic motor piston it Between channel, and then under the action of difference force, air motor piston is up moved since bottom dead centre, and drives reversing piston It moves upwards；

When reversing piston moves upward at the top of cushion dashpot, cushion dashpot is driven to move upwards, cushion dashpot drives the reversal valve Core moves upwards, and realizes that change-over valve core switches to upper position from lower position.