CN201344030Y - Underground atomizer for gas recovery by liquid drainage - Google Patents

Abstract

The utility model provides a downhole atomizer for liquid drainage and gas recovery, which comprises a plug, a gland, a suspension joint, an atomizer body, a gas suction pipe and a liquid suction pipe. It is composed of a pipe seat, an atomizing chamber, an annular chamber, a liquid nozzle, a flow channel and an outer cylinder. The atomizer can atomize the accumulated liquid at the bottom of the well and completely solve the problem of the accumulated liquid at the bottom of the well.

Description

Downhole atomizer for liquid drainage and gas recovery

technical field

The utility model provides a well bottom fluid atomization tool used in natural gas wells, in particular, a downhole atomizer for liquid drainage and gas recovery.

Background technique

In natural gas production, as the pressure of the gas reservoir drops and the coning of edge water and bottom water, the produced water or condensate cannot self-spray out of the wellbore along with the natural gas, and stays at the bottom of the well to form a liquid accumulation column, causing additional damage to the gas reservoir. The hydrostatic back pressure of the gas well leads to a continuous decline in the self-spraying energy of the gas well, and even causes the gas well to be crushed to death and stop production, especially in the middle and late stages of gas well development, which seriously affects the development efficiency of the gas well and the recovery factor of the gas well.

Conventional liquid drainage gas recovery technology includes plunger gas lift liquid drainage gas recovery technology, optimized column liquid drainage gas recovery technology, foam liquid drainage gas recovery technology, machine pumping liquid drainage gas recovery technology, electric submersible pump liquid drainage gas recovery technology, etc. . There are also turbo pump liquid drainage gas recovery technology, concentric capillary tube technology, accelerating tube technology, natural gas continuous cycle gas recovery technology, combined liquid drainage gas recovery technology, etc.

The foam drainage gas recovery process is simple and easy to operate, and it is mainly aimed at those small and medium gas wells with low production. However, foam drainage has great limitations. It is generally limited by various conditions such as well depth, well temperature, daily fluid production, and salinity of water quality in the production layer. When adding continuously, not only ground equipment is required, but also a considerable amount of medicine is required.

After the application of the concentric capillary column technology, the injection of chemicals is more convenient and efficient. The injection of chemical agents through the column can make the produced water of the gas well foam, so as to achieve the effect of assisting the gas well drainage and gas recovery, but it also has limitations. , the initial cost of the capillary column is between the plunger gas lift and the acceleration tube. In addition, due to the application of chemical agents, the operating cost will increase; in addition, the capillary column often has the problem of chemical agent adhesion to the capillary column.

The advantages of electric submersible pump drainage and gas recovery technology are high efficiency, convenient operation and management, complete accessories, convenient service and maintenance, but the biggest problem is that there must be sufficient power supply as a guarantee. For wells with high gas-liquid ratio, the lifting efficiency is low , often due to air locks, the pump fails.

The turbine pump dewatering gas recovery process uses high-speed hydraulic turbines instead of expensive submersible motors to drive downhole centrifugal pumps for oil recovery. It has the advantages of high reliability, easy adjustment, light weight, small size, high temperature resistance and corrosion resistance, but requires ground power.

Optimum pipe string and accelerated tube technology Drainage and gas recovery process needs to change the pipe string after fracturing, the process is simple to implement; but the pressure consumption is high, and it is adaptable to water content, suitable for gas wells with less liquid accumulation, and the displacement is limited.

Gas lift (continuous, intermittent) liquid drainage gas recovery technology installs a gas lift valve on the tubing, injects high-pressure natural gas, liquid nitrogen, or other gases into the shutdown well on the ground, uses the energy of the injected gas to open the gas lift valve, and lifts The liquid in the wellbore reduces the production pressure difference of the gas well and restores the production capacity of the well. Gas lift is currently the most widely used liquid drainage and gas recovery method in oilfields. Gas lift drainage has strong adaptability and flexible displacement. For wells with high gas-liquid ratio, sandy and corrosive media, gas lift is more effective than other lifting methods. The disadvantage is that construction requires a stable gas source, and The one-time investment of ground equipment using compressor boosting is large.

The ball plug gas lift drainage gas recovery technology is a special gas lift method proposed to solve the production problems of severe liquid slip loss and low lifting efficiency in low-pressure oil and gas wells under conventional gas lift methods. It adopts U-shaped double-pipe strings (one injection and one production), and injects air-lift balls into the injected airflow as the solid interface between the gas-liquid phase to achieve a stable slug flow, effectively prevent the liquid from falling back, and reduce the loss of slippage and injection. The gas volume increases the production pressure difference; in addition, changing the oil pipe to a smaller size improves the two-phase instability of conventional continuous gas lift, enabling continuous gas lift under extremely low formation pressure, improving the lifting efficiency, and ultimately improving the recovery of gas wells .

Coiled tubing deep well drainage and gas recovery technology intermittently assists drainage, and the cost is high.

The current maximum displacement of mechanical pumping, drainage and gas recovery is 70m ³ /d, and the maximum pump depth is 2000m. The displacement is limited by the depth of the pump, and the maintenance cost is high. For wells with high gas-liquid ratio or sand production wells, the efficiency is low.

Therefore, there is an urgent need in the art for an atomization tool that atomizes the accumulated fluid at the bottom of the well to completely solve the problem of the accumulated fluid at the bottom of the well.

Contents of the invention

Therefore, the author creates the utility model in view of the above-mentioned shortcoming.

The purpose of this utility model is to provide a liquid accumulation atomization tool used in natural gas wells that can be installed at the bottom of the well, through which the liquid accumulation can be atomized at the bottom of the well to completely solve the problem of liquid accumulation at the bottom of the well .

The utility model provides a downhole atomizer for liquid drainage and gas recovery, which is characterized in that the atomizer includes a plug, a gland, a suspension joint with a central tube, one end connected with the gland and the plug, and the other end The atomizer body connected with the suspension joint, and the gas suction pipe and the liquid suction pipe that pass through the plug and through the gland and are connected with the atomizer body; the atomizer body is composed of a nozzle, a nozzle seat, atomization chamber, annular chamber, liquid nozzle, flow channel and outer cylinder, the atomization chamber is set in the outer cylinder, one end of the atomization chamber communicates with the central pipe of the suspension joint, The other end is in communication with the nozzle, and the end of the nozzle away from the atomization chamber is connected to the gas suction pipe that runs through the gland. The nozzle is covered with a nozzle seat, and the nozzle seat is The outer wall is attached to the inner wall of the outer cylinder, and the two ends are respectively connected with the atomization chamber and the gland to fix the nozzle in the outer cylinder, and the annular chamber is arranged around the atomizer On the outside of the atomization chamber, the liquid nozzle penetrates through the wall of the atomization chamber so that the annular chamber communicates with the atomization chamber through the liquid nozzle, and the nozzle seat is provided with a flow channel, One end of the flow channel communicates with the annular chamber, and the other end connects with the liquid suction pipe. The outer cylinder is a cylindrical cylinder located at the outermost side of the atomizer body. One end is connected with the suspension joint, and the other end is connected with the gland and the plug.

The atomizer of the utility model is directly installed or installed at the bottom of the well in the way of throwing and fishing, and uses the pressure of the natural gas reservoir to do work to continuously atomize the bottom fluid. After the bottom fluid is atomized, it is normally carried to the wellhead by the airflow. The atomized liquid drainage and gas recovery process does not change the existing pipe string structure, does not require other devices and power, has a simple and reliable structure, and has strong operability. Compared with the existing liquid drainage and gas recovery process, the atomization liquid drainage and gas recovery process can To further improve the development efficiency and ultimate recovery of gas reservoirs, the research on atomization liquid drainage and gas recovery technology has important engineering value.

In the downhole atomizer for liquid drainage and gas recovery of the present utility model, it is also characterized in that the liquid suction pipe is preferably provided with a jet pump, and the two ends of the jet pump communicate with the liquid suction pipe, and the other end It communicates with the gas suction pipe, so that the power of the jet pump is derived from the high-pressure air flow in the gas suction pipe; the jet pump is installed at the position where the liquid suction pipe is close to the atomizer body.

The jet pump is used to suck the liquid at the bottom of the well, and it can better suck the liquid from a few meters to more than ten meters below the atomizer into the atomizer. The power of the jet pump is part of the air flow diverted from the gas suction pipe. . The utility model can also not be provided with a jet pump and use other power to suck the bottom fluid into the atomizer.

In the downhole atomizer for liquid drainage and gas recovery of the present utility model, it is also characterized in that the side wall of the gland is attached to the inner wall of the outer cylinder, and one end of the gland is connected to the nozzle seat , the other end is in contact with the plug, and the gland can move relatively axially on the inner wall of the outer cylinder. The power of the gland movement comes from the pressure exerted by the plug on the gland, so that the axis The relative position and tightness of the internal structure of the outer cylinder can be adjusted by moving to, and the structure in the outer cylinder can be compressed according to the needs; Consistent through holes, the through holes are arranged on the gland so that the gas suction pipe and the liquid suction pipe passing through the through holes can be connected to the nozzle pipe and the flow channel respectively.

In the downhole atomizer for liquid drainage and gas recovery of the utility model, it is also characterized in that the connection between one end of the suspension joint and the outer cylinder is preferably a buckle connection, and the suspension joint is connected to the atomizer through the buckle connection. The other end of the suspension joint is provided with a male buckle joint, so that it is buckled with the external seat seal through the male buckle joint. The atomizer provided by the utility model is connected with the seat seal by means of the male buckle joint provided on the suspension joint, so that the atomizer can be suspended on the seat seal, and can be lowered into any part of the gas production pipe along with the seat seal. position, even down to the bottom of the tubing.

In the downhole atomizer for liquid drainage and gas recovery of the present utility model, it is also characterized in that the plug and the inner wall of the bottom end of the outer cylinder are preferably connected by a buckle connection (buckle connection), The connection method can adjust the position of the plug. The purpose of adjusting the position of the plug is to apply pressure to the gland, so that the position of the gland moves in the outer cylinder. The displacement of the gland gives a certain force to the nozzle seat, which can drive the atomization The parts and structures in the atomizer body change in position, and the parts in the atomizer body are properly pressed or loosened as required. The parts in the atomizer body described here are mainly the atomization chamber and the spray pipe, which are placed in the outer cylinder of the atomizer body and connected to each other, in order to prevent the atomization chamber and nozzle The nozzle is shifted in the outer cylinder. The utility model is provided with a nozzle seat outside the nozzle. The nozzle seat limits the displacement of the nozzle to a certain extent. The positioning pins can also be used to connect the atomization chamber, the nozzle and/or Or the nozzle seat is fixed at an appropriate position in the outer cylinder, and one end of the atomizer body is fixed by a buckled plug and a gland attached to the inner wall of the outer cylinder, and a through hole is set on the gland to penetrate the gas The suction pipe and the liquid suction pipe, and the position of the hole should be connected to the gas suction pipe and the nozzle, and the liquid suction pipe to the flow channel.

According to the needs of actual operation, the position of the gas suction pipe is higher than the position of the liquid suction pipe in the downhole atomizer for liquid drainage and gas recovery of the present utility model.

The above-mentioned gas suction pipe is located at the lower part of the atomizer and is higher than the liquid suction pipe. This design can ensure that the gas suction pipe sucks the natural gas at the bottom of the well. After inhaling natural gas, part of the flow can be diverted to the jet pump to suck the liquid into the atomizer body, and the rest of the flow will enter the nozzle and accelerate, and the accelerated airflow will enter the atomization chamber.

The applicant of the utility model found in the scientific research that the nozzle connected to the atomization chamber on the atomizer body can be a common nozzle, or a Laval nozzle with a contracted tube and expanded tube structure.

In a preferred embodiment of the present utility model, the jet pump of the downhole atomizer for liquid drainage and gas recovery is preferably arranged at one end of the liquid suction pipe close to the atomizer body, and the liquid suction pipe and the atomizer The inner annular chamber is communicated. Since the jet pump is also connected with the gas suction pipe, the high-pressure gas from the gas suction pipe can be used as power, and the bottom well fluid can be sucked into the annular chamber through the liquid suction pipe. indoor.

The nozzle of the utility model can be any nozzle available in the art. In order to achieve a better liquid absorption effect, the nozzle of the utility model can preferably be a Laval nozzle.

The first half of the Laval nozzle shrinks from large to small to a narrow throat in the middle, which can be called a contraction tube; after the narrow throat expands from small to large, it can be called an expansion tube. The principle of the Laval nozzle is: the air flow is under pressure, for example, the gas flow in the rocket engine moves backward through the nozzle under the pressure of the combustion chamber, and the gas movement follows the "fluid movement in the tube" during the shrinking tube stage. When the cross-section is small, the flow velocity is high, and the flow velocity is small at the large cross-section", so the airflow is constantly accelerating. When reaching the narrow throat, the flow speed reaches the speed of sound and can even exceed the speed of sound. However, the transonic fluid no longer obeys the principle of "the flow velocity is high at the small cross-section, and the flow velocity is small at the large cross-section" when it moves, but on the contrary, the larger the cross-section, the faster the flow velocity. Therefore, in the stage of expanding the tube, the gas flow velocity is further accelerated, which can reach a speed several times higher than the speed of sound.

The liquid suction pipe of the utility model is located at the bottom of the atomizer, and the suction end of the liquid suction pipe is preferably much lower than the gas suction pipe, so that the liquid suction pipe can inhale the effusion formed at the bottom of the well. The preferred jet pump is set on the top of the liquid suction pipe to suck the bottom fluid into the annular chamber, and the liquid nozzle is installed on the outer wall of the atomization chamber to accelerate the gas-liquid mixture and spray it into the atomization chamber. The high-speed airflow formed by the Laval nozzle collides with the high-speed liquid ejected from the liquid nozzle at high speed in the atomization chamber. During the collision of the liquid, the inertial force overcomes the surface tension, causing large-sized droplets to break into small-diameter droplets , and then carried by the airflow, it flows out of the atomizer through the upper outlet of the atomizer, and then enters the oil pipe through the center tube of the external seat seal.

Therefore, the preferred Laval nozzle of the nozzle of the present utility model is to make the effect of the utility model to atomize the effusion more remarkable by means of its "flow speed booster".

In order to meet the needs of liquid accumulation atomization, the number of liquid nozzles arranged on the outer wall of the atomization chamber is preferably more than two, that is, the number of liquid nozzles is preferably several.

The upper end of the atomizer body is connected with the external seat seal through the suspension joint, mainly the outer cylinder of the atomizer body is connected with the buckle of the suspension joint through buckle connection, so that the atomizer can be hung on the seat seal, and With the seat seal, it can be lowered into any position of the gas production tubing, and generally can be lowered to the bottom of the tubing.

The lower end of the atomizer body can adjust the position of the plug through the plug and the buckle connection between the plug and the outer cylinder, so as to push the gland to compress or loosen the internal structure, and the gas suction pipe and liquid suction pipe pass through the plug , one end goes through the gland and communicates with the atomizer body, and the opening at the other end is connected with the bottom of the well.

Atomized liquid drainage gas recovery can control the liquid level in the wellbore, prevent the impact of bottom-hole liquid accumulation, completely eliminate the problem of liquid accumulation wells and dead wells, prolong the production time of natural gas wells, and improve the development efficiency and recovery rate of gas reservoirs. The atomizer can be lowered into the bottom of the well in the way of throwing and fishing like a choke and other tools, without changing the existing pipe string structure, simple and reliable.

At present, conventional gas recovery technologies that have been used in the field for many years include plunger gas lift drainage gas recovery technology, optimized column drainage gas recovery technology, foam drainage gas recovery technology, mechanical pumping drainage gas recovery technology, electric submersible pump drainage gas recovery technology, etc. There are also turbine pump drainage gas recovery technology, concentric capillary tube technology, accelerating tube, natural gas continuous circulation gas recovery technology, combined drainage gas recovery technology, etc., but the above-mentioned processes have their own shortcomings to varying degrees.

The utility model completely solves the problem of the bottom fluid by atomizing the fluid accumulation at the bottom of the well. The atomizer uses the energy of the natural gas reservoir itself to do work to atomize the bottom-hole liquid accumulation and reduce the droplet diameter. It does not require any additional equipment and power. It has a simple and reliable structure and strong operability. Better application prospects.

The specific advantages are:

(1) Using the energy of the gas reservoir itself, no additional power is required; the structure and process are simple, the cost is low, and the diameter of the production string can be increased without replacing the string. Compared with continuous bubble row, the cost is reduced by 20%, and compared with gas lift, the cost is reduced by 28%.

(2) Make effective use of formation energy and increase the output per unit pressure drop, which is about 15% higher than conventional methods (bubble row, gas lift), thereby increasing daily gas production and total gas production, and improving economic benefits.

(3) It can be drained in time, and can be drained as it is produced, without causing intermittent production reduction or shutdown; it will not cause frequent well shut-in and avoid the formation of closed gas, especially when the formation pressure is close to the depletion pressure, it can still be produced, thereby improving recovery. The recovery rate of the gas reservoir can be increased by 1.4% by using the atomization liquid drainage gas recovery process.

Description of drawings

Fig. 1: The utility model adopts the sectional view of the downhole atomizer of liquid drainage and gas extraction with common nozzle;

Fig. 2: The sectional view of the downhole atomizer for liquid drainage and gas recovery of the utility model adopting the Laval nozzle.

Figure number:

1——Suspension joint 2A——Plug 2B——Gland 3——Gas suction pipe

4——Liquid suction pipe 5——Jet pump 6——Nozzle 6a——Laval nozzle

7——atomizing chamber 8——annular chamber 9——liquid nozzle 10——flow channel

11——outer cylinder 12——nozzle seat 13——locating pin

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings, but the implementation scope of the utility model is not limited.

Example 1.

In the early stage of gas well production, in natural gas reservoirs with serious bottom water and edge water, liquid accumulation will also occur at the bottom of the well in the early stage of production. As shown in Figure 1, Figure 1 is a sectional view of a downhole atomizer for liquid drainage and gas recovery using a common nozzle, the downhole atomizer for liquid drainage and gas recovery includes a plug 2A, a gland 2B, a central tube Suspension joint 1, atomizer body connected to plug 2A, gland 2B and suspension joint 1 at both ends, gas suction pipe 3 that runs through plug 2A and gland 2B in turn and connects to atomizer body , liquid suction pipe 4 and jet pump 5; the atomizer body consists of nozzle 6, nozzle seat 12, atomization chamber 7, annular chamber 8, liquid nozzle 9, flow channel 10 and outer cylinder 11, the nozzle 6 communicates with the atomization chamber 7, the other end communicates with the gas suction pipe 3, the other end of the atomization chamber 7 communicates with the central pipe of the suspension joint 1, and several liquid nozzles 9 are arranged on the atomization chamber 7 and penetrate its outer wall, The annular chamber 8 surrounds the outside of the atomizing chamber 7 and communicates with the atomizing chamber 7 through the liquid nozzle 9. The flow channel 10 is arranged on the nozzle seat 12, and one end communicates with the annular chamber 8, and the other end communicates with the liquid suction pipe 4 , the outer cylinder 11 is a cylindrical cylinder, which wraps the nozzle 6, the nozzle seat 12, the atomization chamber 7, the annular chamber 8, the liquid nozzle 9 and the flow channel 10, one end of which is connected with the suspension joint 1, and the other end Connect with plug 2A and gland 2B. The nozzle base 12 and the atomizing chamber 7 are fixed in a relatively firm position in the outer cylinder 11 by means of the positioning function of the positioning pin 12 .

The jet pump 5 uses part of the high-pressure gas from the gas suction pipe 3 as a power source, and sucks the bottom fluid into the flow channel 10 to the annular chamber 8 through the liquid suction pipe 4, and is installed on the outer wall of the atomization chamber 7. The liquid nozzle 9 is used to accelerate the gas-liquid mixture and inject it into the atomization chamber 7. The high-speed airflow formed by the nozzle 6 collides with the high-speed liquid ejected from the liquid nozzle 9 in the atomization chamber 7 at a high speed, and the liquid collides with the airflow. During the process, the inertial force overcomes the surface tension, causing the large-sized droplets to be broken into small-diameter droplets. Then, under the airflow, they flow out of the atomizer through the upper outlet of the atomizer body, and then pass through the center of the outer seat seal. The tube goes into the tubing.

The accumulated liquid enters the atomizing chamber 7 from the liquid suction pipe 4, and the atomization of the liquid can be realized as long as the parameters of the atomizer nozzle 6 and each liquid nozzle 9 are reasonably selected.

Example 2.

In the middle and later stages of gas well production, continuous liquid accumulation occurs at the bottom of the well, and the atomizer shown in Figure 2 is used. Figure 2 is a cross-sectional view of the downhole atomizer for liquid drainage and gas recovery using Laval nozzle of the present utility model , the downhole atomizer for liquid drainage and gas recovery includes a plug 2A, a gland 2B, a suspension joint 1 with a central tube, and an atomizer body whose two ends are respectively connected to the plug 2A, gland 2B and suspension joint 1 , the gas suction pipe 3, the liquid suction pipe 4 and the jet pump 5 that run through the plug 2A and the gland 2B and are connected to the atomizer body; the atomizer body consists of a Laval nozzle 6a, an atomization chamber 7, an annular The chamber 8, the liquid nozzle 9, the flow channel 10 and the outer cylinder 11 are composed. The Laval nozzle 6a communicates with the atomization chamber 7, and the other end communicates with the gas suction pipe 3 that runs through the gland 2B. The atomization chamber 7 The other end communicates with the central pipe of the suspension joint 1. Several liquid nozzles 9 are arranged on the outer wall of the atomization chamber 7 and run through the outer wall. The annular chamber 8 surrounds the outer wall of the atomization chamber 7 and passes through the liquid nozzles 9 and The atomization chamber 7 communicates, and the flow channel 10 is set on the nozzle seat 12, which is located inside the atomizer body near the plug 2A. One end of the flow channel 10 is connected with the annular chamber 8, and the other end is connected with the through gland The liquid suction pipe 4 of 2B is connected, and the outer cylinder 11 is a closed cylindrical cylinder, which is located on the outermost side of the atomizer body and wraps the Laval nozzle 6a, the nozzle seat 12, the atomization chamber 7, and the annular chamber 8 , the liquid nozzle 9 and the flow channel 10, one end of the outer cylinder 11 is connected with the suspension joint 1, the inner wall of the other end is connected with the plug 2A, and the side wall of the gland 2B which is closely attached to one end of the plug 2A is connected to the The outer cylinder 11 maintains a movable contact state.

The jet pump 5 sucks the bottomhole fluid into the annular chamber 8 through the liquid suction pipe 4 by means of the power source from the gas in the gas suction pipe 3, and the liquid nozzle 9 installed on the outer wall of the atomization chamber 7 is used to inject the gas-liquid mixture into the annular chamber 8. Accelerate, spray into the atomizing chamber 7, the high-speed airflow formed by the Laval nozzle 6a and the high-speed liquid ejected from the liquid nozzle 9 collide at high speed in the atomizing chamber 7, and the inertial force of the liquid overcomes the surface tension during the collision of the airflow , causing the large-sized droplets to be broken into small-diameter droplets, and then carried by the airflow, they flow out of the atomizer through the upper outlet of the atomizer body, and then enter the oil pipe through the center tube of the external seat seal.

The accumulated liquid enters the atomization chamber 7 from the liquid suction pipe 4, as long as the parameters of the atomizer Laval nozzle 6a and each liquid nozzle 9 are reasonably selected, the atomization of the liquid dispersed phase can be realized, and the accumulated liquid at the bottom of the well can be discharged in time , so as to improve the gas recovery efficiency.

Example 3.

When the production of gas wells is close to depletion, and the current process cannot achieve gas recovery by draining liquid, the atomizer of Example 1 or Example 2 is used to reasonably match various structural parameters to reduce the pressure drop of the tool, and the liquid mist at the bottom of the well can still be removed. Gas can still be produced under very low formation pressure, thereby increasing the recovery rate. It is estimated that the recovery rate can be increased by 1.4%.

Claims (9)

1. A downhole atomizer for liquid drainage and gas recovery, characterized in that the atomizer includes a plug, a gland, a suspension joint with a central pipe, one end connected to the gland and the plug, and the other end connected to the suspension joint The connected atomizer body, and the gas suction pipe and liquid suction pipe that pass through the plug and through the gland and connect with the atomizer body; Composed of an atomizing chamber, an annular chamber, a liquid nozzle, a flow channel and an outer cylinder, the atomizing chamber is arranged in the outer cylinder, one end of the atomizing chamber communicates with the central pipe of the suspension joint, and the other end communicates with the central pipe of the suspension joint. The nozzles are connected, and the other end of the nozzle is connected to the gas suction pipe that runs through the gland. The outer side of the nozzle is provided with a nozzle seat for fixing the nozzle. The nozzle seat The outer wall of the outer cylinder is attached to the inner wall of the outer cylinder, and the two ends are respectively connected with the atomization chamber and the gland, the annular chamber is arranged around the outer side of the atomization chamber, and the liquid Nozzles are installed through the wall of the atomization chamber so that the annular chamber communicates with the atomization chamber, the nozzle seat is provided with a flow channel, and one end of the flow channel communicates with the annular chamber, The other end is in contact with the liquid suction pipe. The outer cylinder is a cylindrical cylinder located on the outermost side of the atomizer body. One end of the outer cylinder is connected to the suspension joint, and the other end is connected to the gland and The plugs are connected. 2. The downhole atomizer for liquid drainage and gas extraction according to claim 1, wherein a jet pump is provided on the liquid suction pipe, and the two ends of the jet pump communicate with the liquid suction pipe, and the other One end communicates with the gas suction pipe. 3. The downhole atomizer for liquid drainage and gas recovery according to claim 1, characterized in that, the side wall of the gland is attached to the inner wall of the outer cylinder, and one end of the gland is connected to the nozzle seat The other end is in contact with the plug. 4. The downhole atomizer for liquid drainage and gas recovery according to claim 1, characterized in that the gland is provided with a through hole whose diameter is consistent with the diameter of the gas suction pipe and the liquid suction pipe The gas suction pipe and the liquid suction pipe that pass through the gland through the through hole are connected to the nozzle pipe and the flow channel respectively. 5. The downhole atomizer for liquid drainage and gas recovery according to claim 1, characterized in that, the connection mode between the top inner wall of the outer cylinder and the suspension joint is a buckle connection; the bottom of the outer cylinder The connection mode between the end inner wall and the plug is a buckle connection. 6. The downhole atomizer for liquid drainage and gas recovery according to claim 2, characterized in that, the jet pump is arranged at one end of the liquid suction pipe close to the atomizer body, and the jet pump is connected with the The above-mentioned gas suction pipe is connected, so that the high-pressure airflow in the gas suction pipe becomes the power source of the jet pump. 7. The downhole atomizer for liquid drainage and gas recovery according to claim 1, wherein the position of the gas suction pipe is higher than that of the liquid suction pipe. 8. The downhole atomizer for liquid drainage and gas recovery according to claim 1, characterized in that there are more than one liquid nozzles, all of which penetrate the atomization chamber. 9. The downhole atomizer for liquid drainage and gas recovery according to any one of claims 1-8, characterized in that the nozzle is a Laval nozzle.

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