CN112901125B - Secondary sand prevention pipe column of casing damage rock debris well - Google Patents
Secondary sand prevention pipe column of casing damage rock debris well Download PDFInfo
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- CN112901125B CN112901125B CN201911220224.2A CN201911220224A CN112901125B CN 112901125 B CN112901125 B CN 112901125B CN 201911220224 A CN201911220224 A CN 201911220224A CN 112901125 B CN112901125 B CN 112901125B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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Abstract
本发明为一种套损出岩屑井的二次防砂管柱，包括二次防砂筛管以及冲砂接管，二次防砂筛管包括基管，基管的管壁外表面凹设有多个防砂凹槽，防砂凹槽的底面开设有穿孔，在每个防砂凹槽内设有一个过滤单元，在过滤单元的内表面与防砂凹槽的底面之间设有覆盖穿孔的酸溶块。冲砂接管的内壁上设有凸环和阶梯部，在凸环和阶梯部之间设有酸溶过流管、封堵球和弹簧，封堵球的上部与凸环的底部之间设有一定间隙，酸溶过流管的侧壁沿其周向间隔设有多个通孔。本发明的二次防砂管柱能够在二次防砂管柱下入过程中，实现同时利用二次防砂管柱进行冲砂作业，避免因套损处出砂出岩屑速度快、量大而造成二次防砂管柱无法下入井内的问题。
The invention relates to a secondary sand control pipe string for casing damage out of cuttings well, which comprises a secondary sand control screen pipe and a sand flushing nozzle. Sand control groove, the bottom surface of the sand control groove is provided with perforations, a filter unit is arranged in each sand control groove, and an acid solution block covering the perforation is arranged between the inner surface of the filter unit and the bottom surface of the sand control groove. A convex ring and a stepped part are arranged on the inner wall of the sand flushing nozzle, an acid-dissolving flow pipe, a blocking ball and a spring are arranged between the convex ring and the stepped part, and a top part of the blocking ball and the bottom of the convex ring are provided with With a certain gap, the side wall of the acid-dissolving flow pipe is spaced with a plurality of through holes along its circumferential direction. The secondary sand control pipe string of the invention can realize the simultaneous use of the secondary sand control pipe string to carry out the sand flushing operation during the running process of the secondary sand control pipe string, so as to avoid the high speed and large amount of sand and cuttings produced at the casing damage. The problem that the secondary sand control string cannot be run into the well.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a secondary sand prevention pipe column of a casing damage rock debris well.
Background
Oil fields such as Liaohe oil field, Daqing oil field and the like are developed for years and enter the later development stage at present. After the oil well is mined for many years, wells with casing damage (namely casing damage), casing deformation and casing fracture in the sand control pipe column of the prior sieve pipe increase year by year, and in some old blocks, the proportion of damaged wells of the casing exceeds 50 percent, so that a new problem of sand control is brought. The main body is as follows: after the sleeve pipe is damaged or even broken by mistake, the rock debris discharging speed at the sleeve damage part is high, the rock debris discharging amount is large, normal oil pipe sand washing operation cannot be carried out completely, and the secondary sand prevention pipe column is difficult to run.
As shown in fig. 1, the sand control pipe column of the advanced screen pipe generally adopts a well body structure that the advanced sand control screen pipe 03 is connected below a casing 02 and is cemented with a wellbore 01 through a cement sheath, and the advanced sand control screen pipe 03 is arranged corresponding to the position of an oil layer 04. Under the condition that casing damage, casing deformation and casing pipe dislocation do not occur, after the early sand control screen pipe 03 fails in sand control, formation sand enters the early sand control screen pipe 03, as shown in fig. 2, an oil pipe is generally adopted as a sand washing pipe 05 for sand washing, and after the formation sand in the early sand control screen pipe 03 is washed out of the ground, a secondary sand control screen pipe 06 is put into the ground again for sand control, as shown in fig. 3.
However, if casing damage, casing deformation and casing pipe fracture occur in the sand control pipe column of the prior sieve pipe, particularly after casing pipe fracture occurs, as shown in fig. 4, formation sand or formation rock debris directly enters the prior sand control sieve pipe 03 from the casing damage part 07, and the sand and rock debris producing speed is increased. In the sand washing construction link, in the process of lifting the sand washing pipe 05 after sand washing, the sleeve damage part 07 can continue to produce sand, so that formation sand is not washed cleanly, even the sand production and rock debris production speed of some wells is approximately the same as the sand washing speed, sand always exists in the shaft 01, and a secondary sand control pipe column cannot be put into the well.
Therefore, the inventor provides a secondary sand control pipe column for casing damage of a rock debris well by means of experience and practice of related industries for many years, so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to provide a secondary sand control pipe column of a casing damage rock debris producing well, which can realize sand washing operation by utilizing the secondary sand control pipe column simultaneously in the running-in process of the secondary sand control pipe column and avoid the problem that the secondary sand control pipe column cannot be run into the well due to high sand and rock debris producing speed and large quantity at the casing damage position.
The purpose of the invention is realized in this way, a secondary sand control pipe column for a casing damaged rock debris well comprises: the secondary sand control screen pipe is vertically arranged and comprises a base pipe, wherein a plurality of sand control grooves are concavely arranged on the outer surface of the pipe wall of the base pipe along the radial direction of the base pipe, at least one perforation is arranged on the bottom surface of each sand control groove along the radial direction of the base pipe, a filter unit is arranged in each sand control groove, and an acid dissolving block for covering the perforation is arranged between the inner surface of each filter unit and the bottom surface of each sand control groove;
the sand washing connecting pipe is fixed at the bottom end of the secondary sand control screen pipe, the inner wall of the sand washing connecting pipe is provided with a convex ring and a step part with the diameters reduced from top to bottom at intervals, an acid-soluble overflow pipe, a plugging ball and a spring are sequentially arranged between the convex ring and the step part from top to bottom, the axis of the acid-soluble overflow pipe is parallel to the axis of the sand washing connecting pipe, and the top end of the acid-soluble overflow pipe is abutted against the bottom of the convex ring; the upper portion of shutoff ball supports and leans on and is equipped with certain clearance between the bottom of acid-soluble overflow pipe and the upper portion of shutoff ball and the bottom of bulge loop, the top of spring and the lower part fixed connection of shutoff ball, the bottom and the step fixed connection of spring, the lateral wall of acid-soluble overflow pipe is equipped with a plurality of through-holes along its circumference interval, the through-hole is linked together with the inner chamber and the clearance of sand washing takeover.
In a preferred embodiment of the invention, the acid soluble block and the acid soluble flow tube are made of an acid soluble material.
In a preferred embodiment of the present invention, the acid-soluble block and the acid-soluble flow pipe are made of magnesium alloy.
In a preferred embodiment of the present invention, the sand washing connecting pipe comprises an outer pipe, an inner pipe fixed on the inner wall of the outer pipe, and a bottom pipe fixed at the bottom end of the outer pipe, wherein the inner pipe forms a convex ring, and the top surface of the bottom pipe forms a step.
In a preferred embodiment of the present invention, a stepped hole with an enlarged diameter is formed downward on the inner wall of the bottom of the inner tube, and the top end of the acid-soluble overflow tube abuts against the stepped hole.
In a preferred embodiment of the present invention, the inner wall of the inner tube and the portion below the stepped hole are tapered surfaces that gradually expand downward, and the diameter of the plugging ball is larger than that of the stepped hole.
In a preferred embodiment of the present invention, the outer wall of the bottom end of the bottom tube is a conical surface with a diameter gradually decreasing downwards.
In a preferred embodiment of the present invention, the filtering unit includes a filtering layer and a protective layer, the filtering layer is disposed on the bottom surface of the sand prevention groove and covers the through hole, the protective layer is disposed on a side of the filtering layer close to the outer surface of the base pipe and is fixedly connected to the base pipe, the protective layer is provided with a plurality of through holes, and the acid soluble block is disposed between the inner surface of the filtering layer and the bottom surface of the sand prevention groove.
In a preferred embodiment of the present invention, a mounting groove is concavely formed on the inner surface of the filter layer corresponding to each through hole, and an acid dissolving block is arranged in each mounting groove.
In a preferred embodiment of the invention, the system further comprises a suspension packer; the bottom end of the suspension packer is fixedly connected with the top end of the secondary sand control screen pipe.
According to the invention, the acid-soluble block and the acid-soluble flow-through pipe are skillfully arranged in the secondary sand control pipe column, and by utilizing the characteristic that the acid-soluble block can be dissolved by acid liquor, the flow-through channel of the sieve pipe is always in a blocking state due to the existence of the acid-soluble block in the running-in process of the secondary sand control pipe column, and meanwhile, the through hole in the acid-soluble flow-through pipe enables the inside of the whole secondary sand control pipe column to be in a communicating state from top to bottom, so that liquid in a shaft can enter the inside of the secondary sand control pipe column along the through hole in the acid-soluble flow-through pipe in the running-in process of the secondary sand control pipe column, and the phenomenon that the liquid in the shaft cannot enter the inside of the secondary sand control pipe column so that the buoyancy is too large and the secondary sand control pipe column cannot be easily run in the running-in process is avoided.
Simultaneously, go into the in-process under secondary sand control tubular column, if meet stratum sand or detritus and lead to the tubular column to meet and hinder, can utilize this secondary sand control tubular column just directly to carry out the sand washing operation, realize going into of carrying out secondary sand control tubular column simultaneously sand washing, avoid because of casing damage department go out the problem that the detritus is fast, the volume is big and cause secondary sand control tubular column can't go into in the well. After the screen pipe is placed into a designed position in a well, the screen pipe overflowing channel is opened by pumping acid liquor, and meanwhile, the plugging ball in the sand washing connecting pipe is extruded to the bottom of the convex ring under the action of the spring to realize plugging, so that normal oil well sand prevention production is carried out. In addition, through the mutual cooperation of the spring and the plugging ball, fluid can not enter from the lower end of the sand washing connecting pipe in the sand prevention production process of the oil well, the effect of one-way throttling can be achieved, and the normal production of the oil well is guaranteed.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is a structural schematic diagram of the prior sand control pipe column with the sieve pipe.
FIG. 2: the sand washing screen pipe is a structural schematic diagram of the prior sand washing screen pipe which is used for running a sand washing pipe to carry out sand washing operation after the prior sand washing screen pipe fails.
FIG. 3: the structure of the secondary sand control pipe column is schematically shown after the prior sand control screen pipe fails and the secondary sand control screen pipe is put into the prior sand control screen pipe.
FIG. 4 is a schematic view of: the prior sieve tube sand control pipe column is a structural schematic diagram of casing damage.
FIG. 5: the invention provides a structural schematic diagram of the secondary sand control pipe column in the running process.
FIG. 6: the invention provides a schematic structural diagram of the secondary sand control pipe column after the secondary sand control pipe column is lowered to a designed position and the suspended packer is set.
FIG. 7: the invention provides a semi-section schematic diagram of a sand washing connecting pipe.
FIG. 8: is a half-section schematic diagram of the inner pipe provided by the invention.
FIG. 9: is a half-section schematic diagram of the acid-soluble overflowing pipe provided by the invention.
FIG. 10: is a half-section schematic diagram of the secondary sand control screen pipe provided by the invention.
FIG. 11: the invention provides a partial section schematic diagram of a secondary sand control screen pipe.
FIG. 12: the invention provides a partial appearance schematic diagram of a secondary sand control screen pipe.
FIG. 13: is a partial cross-sectional schematic view of a substrate tube provided by the present invention.
FIG. 14: a cross-sectional side view of a filter layer provided by the present invention.
FIG. 15: is a top view of a filter layer provided by the present invention.
FIG. 16: a side sectional view of a protective layer provided for the present invention.
FIG. 17: is a top view of the protective layer provided by the present invention.
The reference numbers illustrate:
the prior art is as follows:
01. a wellbore; 02. a sleeve; 03. firstly, sand control screen pipes are arranged; 04. an oil layer; 05. washing the sand pipe; 06. a secondary sand control screen pipe; 07. a damaged portion of the sheath;
the invention comprises the following steps:
1. a secondary sand control screen pipe;
11. a base pipe; 111. a sand prevention groove; 112. perforating;
12. a filtration unit; 121. a filter layer; 1211. mounting grooves; 122. a protective layer; 1221. an overflowing hole; 1222. a protective wall; 1223. welding the part;
13. acid dissolution;
2. sand washing pipe connection; 21. acid-soluble overflow pipes; 211. a through hole; 22. plugging the ball; 23. a spring; 24. an outer tube; 25. an inner tube; 251. a stepped hole; 26. a bottom tube; 261. a step portion;
3. hanging a packer;
4. a sleeve; 41. a damaged portion of the sheath;
5. an oil interval section;
6. and (4) an oil pipe.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 5 to 7 and 9 to 13, the present embodiment provides a secondary sand control pipe string for a damaged debris well, which includes a vertically arranged secondary sand control screen 1 and a sand wash adapter 2 fixed at the bottom end of the secondary sand control screen 1.
The secondary sand control screen pipe 1 comprises a base pipe 11, a plurality of sand control grooves 111 are concavely arranged on the outer surface of the pipe wall of the base pipe 11 along the radial direction, at least one perforation 112 is arranged on the bottom surface of each sand control groove 111 along the radial direction of the base pipe 11, a filter unit 12 is arranged in each sand control groove 111, and an acid soluble block 13 covering the perforation 112 is arranged between the inner surface of each filter unit 12 and the bottom surface of each sand control groove 111. The inner wall of the sand washing connecting pipe 2 is provided with a convex ring and a step part 261 with the diameters reduced from top to bottom at intervals, an acid-soluble overflow pipe 21, a plugging ball 22 and a spring 23 are sequentially arranged between the convex ring and the step part 261 from top to bottom, the axis of the acid-soluble overflow pipe 21 is parallel to the axis of the sand washing connecting pipe 2, and the top end of the acid-soluble overflow pipe 21 abuts against the bottom of the convex ring. The upper portion of the blocking ball 22 abuts against the bottom end of the acid-soluble overflow pipe 21, a certain gap is formed between the upper portion of the blocking ball 22 and the bottom of the convex ring, the top end of the spring 23 is fixedly connected with the lower portion of the blocking ball 22, the bottom end of the spring 23 is fixedly connected with the step portion 261, a plurality of through holes 211 are formed in the side wall of the acid-soluble overflow pipe 21 at intervals along the circumferential direction of the side wall, and the through holes 211 are communicated with the inner cavity of the sand washing connection pipe 2 and the gap.
Specifically, the plurality of sand control grooves 111 are generally evenly distributed on the outer surface of the base pipe 11 to enable uniform flow of fluids into the interior of the base pipe 11 from various locations around the base pipe 11. The through holes 211 are generally uniformly distributed on the wall of the acid-soluble overflow pipe 21, the outer diameter of the acid-soluble overflow pipe 21 is larger than the inner diameter of the convex ring, and the diameter of the plugging ball 22 is larger than the inner diameter of the acid-soluble overflow pipe 21. When the acid-soluble overflowing pipe 21 is not dissolved, the spring 23 is in a compressed state, and after the acid-soluble overflowing pipe 21 is completely dissolved, the blocking ball 22 abuts against the bottom of the convex ring to realize a blocking effect under the action of the spring 23.
The blocking ball 22 is generally made of steel balls, and the acid-soluble block 13 and the acid-soluble flow-through pipe 21 are made of acid-soluble materials and can be completely dissolved after being soaked in an acid solution for a certain time. For example, the acid-soluble block 13 and the acid-soluble flow pipe 21 are both made of magnesium alloy, and can be completely dissolved after being immersed in earth acid. Of course, the acid-soluble block 13 and the acid-soluble flow-through tube 21 may be made of other acid-soluble materials, and the blocking ball 22 may be made of other materials, as required.
From this, acid-soluble piece 13 and acid-soluble overflow pipe 21 have been set up ingeniously in this embodiment, utilize its characteristic that can be dissolved by acidizing fluid, go into the in-process under the secondary sand control tubular column because the existence of acid-soluble piece 13 makes the screen pipe overflow passageway be in the shutoff state all the time, simultaneously because be equipped with through-hole 211 on the acid-soluble overflow pipe 21 and make the inside of whole secondary sand control tubular column be in the intercommunication state from top to bottom, so go into the in-process under the secondary sand control tubular column, the inside that the through-hole 211 on the acid-soluble overflow pipe 21 can be followed to liquid in the pit shaft gets into the secondary sand control tubular column, thereby avoid the interior liquid of pit shaft can't get into the inside buoyancy that leads to the secondary sand control tubular column to go into the in-process too big difficult to go into down.
Simultaneously, go into the in-process under secondary sand control tubular column, if meet stratum sand or detritus and lead to the tubular column to meet and hinder, can utilize this secondary sand control tubular column just directly to carry out the sand washing operation, realize going into of carrying out secondary sand control tubular column simultaneously sand washing, avoid because of casing damage department go out the problem that the detritus is fast, the volume is big and cause secondary sand control tubular column can't go into in the well. After the sand washing connecting pipe is placed into a designed position in a well, the screen pipe overflowing channel can be opened by pumping acid liquor, and meanwhile, the plugging ball 22 in the sand washing connecting pipe 2 is extruded at the bottom of the convex ring under the action of the spring 23 to realize plugging, so that normal sand prevention production of the oil well is carried out. In addition, through the mutual cooperation of spring 23 and shutoff ball 22, fluid can not get into from the lower extreme of sand washing connecting pipe 2 in the oil well sand control production process, can also play one-way throttle effect, has guaranteed the normal production of oil well.
In a specific implementation, as shown in fig. 7, for convenience of processing and installation, the sand washing adapter 2 includes an outer tube 24, an inner tube 25 fixed on the inner wall of the outer tube 24, a bottom tube 26 fixed at the bottom end of the outer tube 24, a convex ring formed by the inner tube 25, and a stepped portion 261 formed by the top surface of the bottom tube 26. The outer wall of the inner tube 25 is generally screwed to the inner wall of the outer tube 24, and the outer wall of the top end of the bottom tube 26 is screwed to the inner wall of the bottom end of the outer tube 24.
In order to facilitate the installation of the acid-soluble overflowing pipe 21 and to ensure the stability of the structure, as shown in fig. 7 and 8, a stepped hole 251 having an enlarged diameter is formed downward in the bottom inner wall of the inner pipe 25, and the top end of the acid-soluble overflowing pipe 21 abuts against the stepped hole 251. Wherein the outer diameter of the acid-soluble flowing pipe 21 is the same as the diameter of the stepped hole 251, and the inner diameter of the acid-soluble flowing pipe 21 is larger than that of the inner pipe 25.
In order to ensure that the sealing performance of the blocking ball 22 after the acid-soluble overflow pipe 21 is completely dissolved is better after the bottom of the inner pipe 25 is blocked, as shown in fig. 7 and 8, the part of the inner wall of the inner pipe 25 below the stepped hole 251 is a conical surface which is gradually enlarged downwards, and the diameter of the blocking ball 22 is larger than that of the stepped hole 251.
To facilitate running the secondary sand control string into the well, as shown in FIG. 7, the outer wall of the bottom end of the bottom tube 26 is a tapered surface with a downwardly tapering diameter. In addition, the bottom end of the outer tube 24 is typically chamfered.
Further, as shown in fig. 11, the filtering unit 12 includes a filtering layer 121 and a protective layer 122, the filtering layer 121 is disposed on the bottom surface of the sand control groove 111 and covers the perforation 112, the protective layer 122 is disposed on one side of the filtering layer 121 close to the outer surface of the base pipe 11, the protective layer 122 is fixedly connected to the base pipe 11, a plurality of overflowing holes 1221 are disposed on the protective layer 122, and the acid-soluble block 13 is disposed between the inner surface of the filtering layer 121 and the bottom surface of the sand control groove 111.
The protective layer 122 is generally welded to the base pipe 11 by a weld 1223. In order to facilitate the installation of the acid-dissolving block 13, as shown in fig. 11, 14 and 15, an installation groove 1211 is concavely arranged on the inner surface of the filter layer 121 corresponding to each through hole 112, an acid-dissolving block 13 is arranged in each installation groove 1211, the thickness of the acid-dissolving block 13 is the same as the depth of the installation groove 1211, and the diameter of the acid-dissolving block 13 is larger than that of the through hole 112. When the filter layer 121 and the acid soluble block 13 are stacked together and then placed in the protective layer 122 to form the filter unit 12, then the filter unit 12 is placed in the sand control groove 111, and the protective layer 122 is welded and fixed with the base pipe 11 through the welding part 1223.
It should be noted that, in practical applications, the acid-dissolving block 13 may also be disposed between the outer surface of the filtering layer 121 and the inner surface of the protective layer 122 and cover the overflowing hole 1221, so as to achieve the purpose of plugging the overflowing channel of the screen pipe during the running process of the secondary sand control pipe string. Of course, the structure of the acid-dissolving block 13 may also be set in other manners, as long as the flow passage of the sieve tube can be plugged in the running process of the secondary sand control pipe, and the flow passage of the sieve tube can be communicated after the sand washing is finished.
Further, in order to effectively protect the filter layer 121, as shown in fig. 11, 16 and 17, a protective wall 1222 is extended from the outer periphery of the protective layer 122 to the inside of the base pipe 11 in the radial direction of the base pipe 11, the outer sidewall of the protective wall 1222 is attached to the inner sidewall of the sand control groove 111, and the outer sidewall of the filter layer 121 is attached to the inner sidewall of the protective wall 1222. Like this, through the setting of protection wall 1222, play certain guard action to filter layer 121, can prevent simultaneously that the gap from appearing between filter unit 12 and the inside wall of sand control recess 111 and pile up the foreign particles, clean up sand control recess 111 when being convenient for the later stage to filter layer 121 change.
In practical applications, the sand control groove 111 may be a circular groove, a square groove, a triangular groove or a polygonal groove, and the shape of the filter unit 12 should be completely matched with the shape of the sand control groove 111 to reduce a gap between the filter unit 12 and the sand control groove 111. The sand control groove 111 is preferably a circular groove, so that the possibility of generating a gap or a dead angle between the inner side wall of the sand control groove 111 and the filter unit 12 is reduced to the maximum extent, and the accumulation of impurity particles is further reduced; meanwhile, the circular grooves are stressed uniformly, so that the strength of the base pipe 11 can be kept to the maximum extent, and the processing is convenient.
The through-flow holes 1221 and the through holes 112 are preferably circular holes, and the circular holes are uniformly stressed, so that the strength and the strength of the protective layer 122 and the base pipe 11 can be maintained to the greatest extent. The number of the overflowing holes 1221, the through holes 112, and the through holes 211 is determined according to actual needs, and the present invention is not limited thereto. The filter layer 121 is generally made of metal fibers or metal wool, and is preferably a multi-layer metal mesh structure, which has the advantages of high strength and strong anti-damage capability.
In addition, in order to avoid damage to the filter layer 121 caused by high-speed fluid directly eroding the filter layer 121, it is preferable that the overflowing holes 1221 and the perforations 112 are staggered as shown in fig. 11.
Furthermore, the whole secondary sand control pipe column further comprises a hanging packer 3, and the bottom end of the hanging packer 3 is fixedly connected with the top end of the secondary sand control screen pipe 1. Wherein, hang packer 3 and generally adopt Y245 type packer, its external diameter size is decided according to the sleeve pipe 4 size of construction well, has the function of hanging secondary sand control tubular column, plays sealed effect simultaneously, and its concrete structure is prior art, no longer gives details here. When in use, two ends of the hanging packer 3 are respectively and fixedly connected with the oil pipe 6 and the secondary sand control screen pipe 1, and fluid can flow through the inside of the hanging packer 3 in the working process. Of course, in practical applications, other types of the suspension packer 3 may be selected, and this embodiment is only for illustration.
In order to better understand the scheme of the embodiment, the working process of the whole secondary sand control pipe column in the embodiment is described in detail as follows:
first, take over 2 with the sand washing in the secondary sand control tubular column, secondary sand control screen pipe 1 and hang packer 3 and connect gradually from bottom to top, the length of whole secondary sand control tubular column needs to satisfy and to guarantee that secondary sand control screen pipe 1 is located oil interval section 5, and hang packer 3 and be located on casing loss position 41, if casing loss position 41 is far away from oil interval section 5, then need be connected the sleeve pipe with the same specification model between hanging packer 3 and secondary sand control screen pipe 1 to practice thrift the cost.
And secondly, starting to put in the secondary sand control pipe column, connecting the top end of the suspended packer 3 by using the oil pipe 6, and putting the secondary sand control pipe column into the well.
When the secondary sand control pipe column meets the sand surface and is blocked in the running process, a pump truck is connected to the ground, well washing liquid is pumped into the air of the oil sleeve ring, and sand washing is carried out by backwashing. Because of the existence of the acid-soluble block 13 and the acid-soluble overflow pipe 21, the overflow channel of the screen pipe is in a blocking state at the moment, the inside and the outside of the secondary sand control screen pipe 1 can not be communicated with each other, the inside of the sand washing connecting pipe 2 is in a vertical through state, the sand washing and well washing liquid can carry out sand washing operation through the secondary sand control screen pipe 1 from top to bottom, and can not flow to the outside of the secondary sand control screen pipe 1 through the wall of the screen pipe, therefore, the sand washing operation of a backwash well can be directly carried out by utilizing the secondary sand control pipe column, the backwash well can ensure that well bottom rock debris and stratum sand are better washed out of the ground, and the running of the secondary sand control pipe column is carried out while sand washing.
When backwashing sand washing, well washing liquid is pumped in from the oil sleeve ring in the air, goes down along the oil sleeve ring, reaches the bottom pipe 26 of the sand washing connecting pipe 2, meets the sand surface and blocks, impacts stratum sand, carries the stratum sand to enter the bottom pipe 26, enters the lower inner cavity of the outer pipe 24 along the inner cavity of the bottom pipe 26, enters the upper inner cavity of the outer pipe 24 through the through hole 211 on the outer wall of the acid-soluble overflow pipe 21, continues to go up, enters the hanging packer 3 through the secondary sand control screen pipe 1, further enters the oil pipe 6, and returns to the ground. Because the space in the oil pipe 6 is smaller than the space of the oil sleeve annulus, the flushing fluid has a higher speed when the flushing is finished and the flushing returns upwards along the oil pipe 6 when the sand flushing is carried out by adopting a mode of flushing sand, and the formation sand or rock debris cannot settle in the process of returning upwards along with the flushing fluid under the condition that the formation sand particles are larger or the rock debris at the sleeve damage part is more serious, so that the sand flushing effect is ensured. Of course, in actual use, a normal well-flushing sand-washing mode of directly pumping the well-washing fluid into the oil pipe 6 may be adopted according to needs, and this embodiment is only an example.
So wash sand and go into secondary sand control tubular column simultaneously, design position in going into the well under secondary sand control tubular column, guarantee that secondary sand control screen pipe 1 is located oil interval section 5, hang packer 3 and be located on casing damage position 41.
And thirdly, pumping acid liquor into the oil pipe 6 after the secondary sand control pipe column is lowered to the designed position, ensuring that the internal space of the whole secondary sand control pipe column can be filled with the common use amount of the acid liquor, and waiting for a period of time to ensure that the acid dissolving block 13 and the acid dissolving overflow pipe 21 are completely dissolved by the acid liquor. After all the sand washing connecting pipe is dissolved, the sieve pipe overflowing channel is communicated again, the blocking ball 22 in the sand washing connecting pipe 2 is extruded on the conical surface of the inner pipe 25 under the action of the spring 23, and the inside of the sand washing connecting pipe 2 is not communicated up and down.
After all the sand is dissolved, the oil sleeve annulus is closed at the wellhead, the well-flushing liquid is continuously pumped into the oil pipe 6, the acid liquid in the secondary sand-prevention pipe column is squeezed into the stratum, and the effect of cleaning the area close to the well can be achieved. In the process, the acid liquid flows mainly to the outside through the screen flow passage, and in a special case, the acid liquid may also push the plugging ball 22 open to flow from the bottom end of the bottom pipe 26 to the outside.
And fourthly, setting the suspended packer 3, wherein the process of specifically realizing setting is the prior art and is not described herein any more. After the secondary sand control pipe column is sealed, the sleeve damage part 41 is sealed, and the secondary sand control function is realized.
After the screen pipe overflowing channel is communicated again, sand prevention production operation can be carried out on the oil well. In the production process of the oil well, the stratum produced fluid can enter the secondary sand control screen pipe 1 through the screen pipe overflowing channel, then goes up through the secondary sand control screen pipe 1 and is extracted out of the ground by the oil well pump. Due to the effects of the plugging ball 22 and the spring 23, in the production process of the oil well, the formation sand outside the secondary sand control screen pipe 1 cannot enter the secondary sand control screen pipe 1 through the sand washing connecting pipe 2, so that the function of one-way flow limiting is achieved.
The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications of the invention without departing from the spirit and principles of the invention should be considered within the scope of the invention.
Claims (10)
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| CN201911220224.2A CN112901125B (en) | 2019-12-03 | 2019-12-03 | Secondary sand prevention pipe column of casing damage rock debris well |
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| CN112901125B true CN112901125B (en) | 2022-06-03 |
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| US7422060B2 (en) * | 2005-07-19 | 2008-09-09 | Schlumberger Technology Corporation | Methods and apparatus for completing a well |
| CN105041241A (en) * | 2015-06-03 | 2015-11-11 | 中国石油化工股份有限公司华东分公司采油厂 | Continuous direct cycle sand cleaning-out device for common oil pipes and technological method |
| MX2018006881A (en) * | 2015-12-18 | 2018-09-06 | Welltec As | Downhole system. |
| CN206158689U (en) * | 2016-10-19 | 2017-05-10 | 中国石油天然气股份有限公司 | An erosion-resistant sand control screen |
| CN108457626A (en) * | 2017-12-28 | 2018-08-28 | 中国石油天然气集团公司 | A kind of dissolution type sand bridge screen casing |
| CN208966207U (en) * | 2018-08-14 | 2019-06-11 | 中国石油天然气股份有限公司 | Joint production string |
| CN209654011U (en) * | 2019-03-18 | 2019-11-19 | 中国石油化工股份有限公司 | Small casing pipe well sand control bottom sand washing service aid |
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