Gas lift plunger based on composite drainage gas recovery technology

Abstract

The present invention relates to a gas lift plunger based on a composite drainage gas production process, comprising a hollow columnar shell, a storage bin and a slide seat arranged vertically opposite to each other, a connecting column arranged coaxially with the storage bin in the middle of the slide seat, a through hole adapted to the connecting column on the storage bin, a liquid inlet on the connecting column, a liquid outlet connected to the storage bin on the side wall of the through hole, a drainage hole connected to the connecting column at the bottom of the slide seat, and in an initial state, the liquid inlet is located below the liquid outlet; the storage bin and the slide seat are connected by a pressure-driven rotation mechanism, when the slide seat is subjected to axial pressure toward the storage bin, the slide seat slides toward the storage bin, and drives the storage bin to rotate through the pressure-driven rotation mechanism, the liquid outlet and the liquid inlet at least partially overlap, so that the liquid foaming agent in the storage bin is discharged through the drainage hole. The present invention can realize the periodic release of the foaming agent, has a good and reliable composite mining process effect, and can be reused many times.

Description

Technical Field

[0001] The invention relates to the field of natural gas water drainage and gas production, and more specifically to a gas lift plunger based on a composite water drainage and gas production process. Background Art

[0002] During the natural gas extraction process, the flow rate of gas production decreases due to the sudden intrusion of water at the edge and bottom of the formation and the decrease in formation pressure. When the gas production is less than the critical flow rate for carrying liquid, the liquid cannot be completely carried out of the wellbore by the natural gas. At the same time, the liquid is retained in the wellbore in the form of a mixed gas column to form liquid accumulation, resulting in excessive production pressure difference of the gas well, flooding of the gas well, and decrease in gas production, which seriously affects the normal extraction of natural gas.

[0003] In order to reduce the impact of liquid accumulation at the bottom of the well, foam drainage gas production or plunger gas lift is usually used for auxiliary production in the actual production process. Foam drainage gas production mainly uses foaming agents to generate foam in the liquid to bring out the accumulated liquid, while plunger gas lift mainly uses sealing to separate the lifting gas and liquid to reduce gas crossflow and fallback, thereby achieving the purpose of improving lifting efficiency.

[0004] The usual practice is to select different auxiliary production processes according to different well conditions. At present, the plunger gas lift process mainly uses a columnar or spherical piston to seal the gas lift. The structure and function of the plunger or ball plug are single, and the effect achieved is not ideal. Of course, there are also some product processes on the market that combine foam drainage gas production and plunger gas lift technology, such as patent number CN201710129344.6, and the patent name is "An integrated composite gas production method of plunger gas lift and foam drainage". The patent mainly mentions making the foam drainage rod into a plunger shape, thereby realizing the composite application of the two production processes.

[0005] However, during the subsequent follow-up research and application process, the applicant found that because the main body is made directly of bubble rods, it will begin to melt as soon as it comes into contact with the accumulated fluid during the process of falling to the bottom of the well, which will increase the diameter difference between it and the wellbore. This will reduce its effect as a plunger to seal the gas lift, thus affecting the effect of the plunger. On the other hand, the plunger is a disposable product and needs to be frequently released periodically, which will also increase the later production costs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a gas lift plunger based on a composite drainage and gas production process, which can realize the periodic release of the foaming agent, has a good and reliable composite mining process effect, and can be reused many times.

[0007] The technical solution adopted by the present invention to solve the technical problem is: construct a gas lift plunger based on a composite drainage gas production process, comprising a hollow cylindrical shell, the bottom of the shell is open, and a storage bin and a slide seat are arranged vertically opposite to each other, wherein the slide seat is slidably matched with the shell and can slide along the axial direction of the shell, and the storage bin is rotatably arranged in the shell and can rotate along the central axis of the shell;

[0008] The middle part of the slide seat has a connecting column coaxially arranged with the storage bin, the storage bin has a through hole adapted to the connecting column, the connecting column is a hollow structure, has a liquid inlet, and the side wall of the through hole is provided with a liquid outlet connected with the storage bin, the bottom of the slide seat has a drainage hole connected with the connecting column, and in the initial state, the liquid inlet is located below the liquid outlet;

[0009] The storage bin and the slide are connected via a pressure-driven rotation mechanism. When the slide is subjected to axial pressure toward the storage bin, the slide slides toward the storage bin and drives the storage bin to rotate via the pressure-driven rotation mechanism. The liquid outlet at least partially overlaps with the liquid inlet, so that the liquid foam discharge agent in the storage bin can be discharged through the drainage hole.

[0010] By adopting the above scheme, the storage bin is mainly used to hold liquid foaming agent. After the plunger is placed, when it falls to the pre-installed downhole buffer in the well, it collides with it, thereby driving the storage bin to rotate, and at the same time the connecting column rises, so that the liquid inlet and the liquid outlet are connected, and the foaming agent in the storage bin can enter the wellbore liquid through the drainage hole, thereby realizing foam drainage and gas recovery. Because the foaming agent is discharged from the bottom, it can be better mixed with the accumulated liquid, thereby improving the foaming reaction speed. At the same time, when the air pressure below the plunger rises, the plunger begins to move upward as a whole and separates from the buffer. The pressure on the sliding seat disappears, the sliding seat quickly resets, the connection between the liquid inlet and the liquid outlet is interrupted, and the foaming agent is no longer discharged, that is, it is ensured that no foaming agent is discharged during the upward and downward processes, and the foaming agent is only discharged in a short time during the collision with the buffer, and it is ensured that this part of the foaming agent directly enters the liquid, so that the plunger is recycled many times, and the foaming agent is also slowly released many times until it is consumed, and then the foaming agent is injected into the storage bin for continued use.

[0011] According to the above scheme, the pressure-driven rotation mechanism includes at least three connecting rods evenly distributed along the circumference of the connecting column, and the upper and lower ends of each connecting rod are respectively connected to the storage bin and the slide seat through a ball-joint structure, and the upper end connection point of each connecting rod is located outside the circumference of the lower end connection point. The multi-directional freedom of the ball-joint structure is fully utilized to convert the axial pressure of the slide seat into a torsional force on the storage bin, and the structure is simple and reliable, and easy to implement.

[0012] According to the above scheme, in the initial state, the connecting rod is inclined relative to the central axis of the connecting column on the cross section. The above scheme is adopted to avoid a large impact force on the storage bin caused by a collision, or instantaneous jamming, etc., and ensure torsional reliability.

[0013] According to the above scheme, a return spring is provided between the storage bin and the slide seat, and the return spring is sleeved on the connecting column, and the upper and lower ends of the return spring are respectively against the storage bin and the slide seat. The above scheme is adopted to facilitate the rapid reset of the slide seat, disconnect the connection between the liquid inlet and the liquid outlet, and extend the service life of the foaming agent.

[0014] According to the above scheme, the storage bin has at least two compartments distributed along the circumference or axial direction of the connecting column, and each compartment has the liquid outlet corresponding to one of them. By adopting the above scheme, different medicines can be added to each storage bin, and after the liquid inlet and the liquid outlet are connected, different medicines enter the connecting column and mix to form the required foaming agent, or finished foaming agents of different properties are directly loaded into each compartment. The liquid inlet is optimized according to the position of the liquid outlet. With the change of the overall gravity of the plunger and the change of the impact force between the plunger and the buffer, the upward stroke of the slide changes. According to its change range, the liquid outlet is connected to different liquid outlets at different stages, that is, different foaming agents are discharged in different cycle types, so as to meet more usage needs.

[0015] According to the above scheme, the side wall of the through hole corresponding to the liquid outlet is provided with a sealing ring A, and the side walls at both ends of the through hole are provided with sealing rings B. The above scheme can effectively prevent the leakage of the foaming agent, ensuring that the foaming agent will be discharged only after the liquid inlet and the liquid outlet are connected.

[0016] According to the above scheme, the slide seat includes an integrally formed sliding part and a pressure-bearing part, wherein the sliding part is slidably matched with the housing, and the bottom of the pressure-bearing part is a pressure-bearing spherical surface. The above scheme can ensure that the direction of the impact force received by the slide seat coincides with the central axis to prevent deflection, which is conducive to improving its movement stability and extending its service life.

[0017] According to the above scheme, the lower end of the pressure-bearing part is in an inverted cone shape, and the outlet end of the drainage hole is distributed on the cone surface. With the above scheme, the medicine or foaming agent can be sprayed out in an umbrella shape, increasing its contact range with the accumulated liquid, and avoiding the contact part with the buffer to become a part with weak stress, and having better mechanical properties.

[0018] According to the above scheme, the lower end of the housing has a plug that matches its thread. In the initial state, the slide seat and the plug are against each other, and the inner side of the lower end of the plug is in the shape of a tapered hole that is axially retracted. With the above scheme, the plug can, on the one hand, limit the downward stroke of the slide seat to a certain extent, and the downward stroke stop of the slide seat can be adjusted by adjusting its screw-in depth; on the other hand, the lower end of the tapered inner hole can play a certain guiding role, ensuring that the center of the bottom of the slide seat contacts and impacts the downhole buffer, that is, ensuring the centering of the impact force.

[0019] According to the above scheme, the housing has a bracket arranged in a detachable manner just above the storage bin, the top of the connecting column is open, and the bracket has a bolt arranged coaxially with the connecting column. The bolt is threadedly matched with the bracket, and its lower end has a piston adapted to the inner diameter of the connecting column, and the position of the piston is adapted to the sliding stroke of the connecting column. With the above scheme, the piston mainly plays a pressurizing role. When the connecting column rises, after the liquid inlet and the liquid outlet are connected by overlap, the foam discharge agent enters the connecting column. The connecting column continues to rise, and the piston enters the connecting column. The two undergo axial displacement, which can accelerate the discharge of the foam discharge agent in the connecting column and the slide seat from the drainage hole. By adjusting the screw-in depth of the bolt, it can be better adapted to the stroke of the connecting column.

[0020] The gas lift plunger based on the composite drainage gas production process of the present invention has the following beneficial effects:

[0021] The gas lift plunger based on the composite water drainage and gas production process provided by the present invention fully utilizes the impact force between the plunger and the downhole buffer to achieve periodic release of the foaming agent, that is, the foaming agent is released once when the plunger is cycled once, and the main effect of the plunger gas lift is not affected. It has a good composite mining process effect and can be recycled and reused many times. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 for Figure 1 A cross-sectional view of

[0025] Figure 3 This is a schematic diagram of the connection between the storage bin and the slide (in the initial state);

[0026] Figure 4 for Figure 3 Front view;

[0027] Figure 5 It is a cross-sectional view of the slide;

[0028] Figure 6It is a top view of the slide;

[0029] Figure 7 For the implementation of the internal structure of the storage warehouse;

[0030] Figure 8 In the initial state, Figure 7 A schematic diagram showing the relative positions of the liquid outlet and the liquid inlet on the storage bin;

[0031] Fig. 9 Implementation II for the internal structure of the storage bin;

[0032] Fig.10 In the initial state, Fig. 9 A schematic diagram showing the relative positions of the liquid outlet and the liquid inlet on the storage bin;

[0033] Fig.11 Implementation 3 of the internal structure of the storage bin, and a schematic diagram of the relative positions of the corresponding liquid outlet and liquid inlet in the initial state;

[0034] Fig.12 It is a schematic diagram of the bracket and piston structure. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0036] refer to Figures 1 to 12 The gas lift plunger based on the composite drainage gas production process shown includes a hollow cylindrical shell 1, which is usually made of metal material. Its circumferential outer side has a sealing ring 10 distributed along its circumference. The sealing ring 10 is distributed at intervals along the axial direction of the shell 1 and is usually made of rubber. Its outer diameter is slightly smaller than the inner diameter of the wellbore oil pipe, mainly to achieve the effect of improving the drainage of the plunger gas lift.

[0037] The bottom of the shell 1 is open, and the top is provided with a recovery head 11 connected by a thread. The shell 1 has a storage bin 2 and a slide seat 3 arranged vertically opposite to each other, wherein the slide seat 3 is slidably matched with the shell 1 and can slide along the axial direction of the shell 1. Figures 2 to 5 The inner wall of the shell 1 has at least two slide grooves 12 opened along its axial direction. There are at least two slide grooves 12, which are evenly distributed along the circumference of the shell 1 and extend to the lower end surface of the shell 1. The circumferential outer side of the slide seat 3 has a protrusion 33 that slides with the slide groove 12 one by one, so as to ensure the smooth sliding of the slide seat 3 and prevent rotation. The storage bin 2 is a hollow structure and is rotatably arranged in the shell 1 and can rotate along the central axis of the shell 1. In specific implementation, the storage bin 2 is usually installed in the shell 1 through a bearing 13. In order to improve its rotation flexibility, it can be made of plastic material.

[0038] The middle part of the slide 3 has a connecting column 30 coaxially arranged with the storage bin 2, and the connecting column 30 is arranged vertically. The storage bin 2 has a through hole 20 adapted to the connecting column 30. The connecting column 30 is a hollow structure with a liquid inlet 31 thereon. The side wall of the through hole 20 is provided with a liquid outlet 21 that penetrates the interior of the storage bin 2. The bottom of the slide 3 has a drainage hole 32 that is connected to the connecting column 30. In the initial state, the liquid inlet 31 is located below the liquid outlet 21 (the upper and lower positions in this application are all referred to as Figure 2 The relative position in is taken as a reference), and the storage bin 2 and the slide 3 are connected to each other through a pressure-driven rotation mechanism. When the slide 3 is subjected to axial pressure toward the storage bin 2, the slide 3 slides toward the storage bin 2 and drives the storage bin 2 to rotate through the pressure-driven rotation mechanism. The liquid outlet 21 and the liquid inlet 31 at least partially overlap, so that the liquid foam discharge agent in the storage bin 2 is discharged through the liquid discharge hole 32.

[0039] In this embodiment, the pressure-driven rotation mechanism includes at least three connecting rods 4 evenly distributed along the circumference of the connecting column 30, and the upper and lower ends of each connecting rod 4 are respectively connected to the storage bin 2 and the slide seat 3 through a ball-jointed structure 40, and the upper end connection point of each connecting rod 4 is located on the circumferential outside of the lower end connection point. The upper and lower ends of the connecting rod 4 are connected to the corresponding components through the ball-jointed structure 40. The two ends of the connecting rod 4 have a good degree of freedom, so that once the connecting rod 4 is deflected, it can better drive the storage bin 2 to rotate. Of course, in addition to adopting this structure, a rotation guide groove structure corresponding to the connecting column 30 can also be directly provided on the side wall of the through hole 20, and the linear motion of the connecting column 30 can be used to drive the storage bin 2 to rotate. Relatively speaking, the structural reliability of this embodiment is better, and it can withstand a larger axial load, and it can also better control the rotation angle of the storage bin 2.

[0040] refer to Figure 3 and Figure 4 In order to further improve the reliability of the pressure-driven rotation mechanism, in the initial state, the connecting rod 4 is inclined in the cross-section relative to the central axis of the connecting column 30, that is, the central axis of any connecting rod 4 and the central axis of the connecting column 30 are not in the same vertical plane. In this way, when the slide 3 is subjected to pressure, it can better drive the storage bin 2 to twist in the pre-tilted direction, prevent instantaneous impact jamming, and better convert the impact force into torsional force.

[0041] A reset spring 5 is provided between the storage bin 2 and the slide 3. As shown in the figure, the reset spring 5 is sleeved on the connecting column 30, and the upper and lower ends of the reset spring 5 are respectively against the storage bin 2 and the slide 3. In this way, once the external pressure on the slide 3 disappears, under the action of the reset spring 5, the relative positions of the storage bin 2 and the slide 3 can be quickly reset to the initial state, which is mainly beneficial for quickly disconnecting the connection state of the liquid inlet 31 at the liquid outlet 21, stopping the discharge of the foaming agent, and better controlling the effective period of composite mining.

[0042] like Figure 2 , Figure 3 , Figures 7 to 11 As shown, in the specific implementation, the storage bin 2 has at least two chambers 22 distributed along the circumferential or axial direction of the connecting column 30, and each chamber 22 has a liquid outlet 21 corresponding to one of them. Different distribution structures can adapt to different application scene requirements. First, refer to Figure 7 and Figure 8 In the first embodiment, the storage bin 2 is divided into a first chamber 22a and a second chamber 22b by a partition A23 arranged along its axial direction, and the radial inner sides of the first chamber 22a and the second chamber 22b are respectively provided with a first liquid outlet 21a and a second liquid outlet 21b penetrating the through hole 20, and the first liquid outlet 21a and the second liquid outlet 21b are centrally symmetrically arranged along the central axis of the through hole 20, and the connecting column 30 is provided with a first liquid inlet 31a and a second liquid inlet 31b at the same height, and the first liquid inlet 31a and the second liquid inlet 31b are also centrally symmetrically arranged about the central axis of the through hole 20, and as shown in FIG. Figure 7 As shown, there is an angle between the first liquid inlet 31a and the first liquid outlet 21a on the circumference, that is, in the initial state, the first liquid inlet 31a is located in front of the first liquid outlet 21a in the circumferential direction (with the rotation direction as a reference).

[0043] When the slide 3 moves upward due to the impact force, it drives the storage bin 2 to rotate, so that the first liquid inlet 31a and the first liquid outlet 21a, as well as the second liquid inlet 31b and the second liquid outlet 21b partially overlap, then the foaming agent in the corresponding chamber can flow into the connecting column 30. This embodiment 1 is mainly suitable for situations where two medicines need to be mixed to form a finished foaming agent.

[0044] Refer to Fig. 9 and Fig.10The second embodiment shown is different from the first embodiment in that the first liquid outlet 21a and the second liquid outlet 21b are not centrally symmetrically arranged, but can be at the same height, that is, in the initial state, the circumferential angle between the first liquid inlet 31a and the first liquid outlet 21a is not equal to the circumferential angle between the second liquid inlet 31b and the second liquid outlet 21b. As shown in the figure, the angle between the first liquid inlet 31a and the first liquid outlet 21a is greater than the circumferential angle between the second liquid inlet 31b and the second liquid outlet 21b. In the early stage of the working of the plunger, the overall weight is large, so the impact force on the slide 3 is large, then the same The torsion angle of the sample storage bin 2 is relatively large, and the first liquid inlet 31a and the first liquid outlet 21a are easier to align and overlap to achieve communication. At this time, the foaming agent in the first chamber 22a is easier to flow out. As the weight is reduced and the impact force is reduced, the torsion angle of the storage bin 2 becomes smaller. At this stage, the second liquid inlet 31b and the second liquid outlet 21b are easier to overlap and align, and the foaming agent in the second chamber 22b is easier to flow out. For the above-mentioned working conditions where the weight change factor is introduced, the first liquid inlet 31a and the second liquid inlet 31b have a certain height difference in the axial direction. This structure can basically meet the application requirements of using different foaming agents in different stages.

[0045] refer to Fig.11 The third embodiment is shown. In this embodiment, the storage bin 2 is divided into two upper and lower chambers by a partition B24 inclined along its radial direction, which are a first chamber 22a at the lower part and a second chamber 22b at the upper part. The first liquid outlet 21a and the second liquid outlet 21b are symmetrically arranged in projection, and there is a height difference in the axial direction. Correspondingly, the first liquid inlet 31a and the second liquid inlet 31b have a vertical distance consistent with the height difference. When the slide 3 is impacted, the first liquid inlet 31a and the first liquid outlet 21a, the second liquid inlet 31b and the second liquid outlet 21b can be connected during the impact force, so as to achieve the purpose of simultaneous outflow from each chamber.

[0046] Of course, this structure can also introduce weight change factors, and make step-change settings for the circumferential angle between the first liquid outlet 21a and the first liquid inlet 31a, and the circumferential angle between the second liquid outlet 21b and the second liquid inlet 31b, so as to achieve the purpose of connecting different liquid inlets with the liquid outlets of the corresponding chambers at different stages.

[0047] In order to further improve the reuse efficiency of the plunger, the top of the storage bin 2 is provided with a liquid injection port 25 connected to each chamber. After the plunger circulates for a certain period, it can be taken out to replenish the corresponding medicine or foaming agent in the chamber.

[0048] Because relative rotation and sliding need to occur between the connecting column 30 and the storage bin 2, there is a certain tolerance gap. In order to prevent the medicine or foaming agent in each compartment from overflowing from the corresponding liquid outlet 21 and causing unexpected mixing or discharge, a sealing ring A (not shown in the figure) is provided on the side wall of the through hole 20 corresponding to the liquid outlet 21. The sealing ring A is embedded in the side wall of the through hole 20 and is located on the circumferential outer side of the corresponding liquid outlet 21. The side walls at the upper and lower ends of the through hole 20 are provided with sealing rings B26. The sealing ring B26 is annular. The sealing ring A and the sealing ring B26 are both interference fit with the outer surface of the connecting column 30.

[0049] refer to Figures 3 to 5 In this embodiment, the slide seat 3 includes an integrally formed sliding portion 3a and a pressure-bearing portion 3b, wherein the sliding portion 3a is generally disc-shaped and slidably cooperates with the housing 1. As shown in the figure, the protrusion 33 is formed on the circumferential outer side of the sliding portion 3a, and the lower end face of the pressure-bearing portion 3b is an upwardly concave arc surface, which constitutes a pressure-bearing spherical surface 34, and its center coincides with the central axis of the connecting column 30, which can better ensure the centrality of the impact force.

[0050] The lower end of the pressure-bearing portion 3b is in an inverted cone shape, and the outlet ends of the drainage holes 32 are distributed on the cone surface. As shown in the figure, all the drainage holes 32 are distributed in an umbrella shape and are inclined relative to the connecting column 30. The inner ends thereof are connected to the connecting column 30, and the outer ends thereof pass through the cone surface of the pressure-bearing portion 3b. In order to further increase the mixing rate of the foam discharge agent and the bottom hole accumulated liquid, the aperture of the drainage holes 32 is gradually reduced in the direction away from the connecting column 30 to increase the instantaneous pressure and speed of the discharge, and at the same time, it can also increase the difficulty of the bottom hole accumulated liquid entering the connecting column 30.

[0051] On this basis, in the present application, a bracket 7 is provided in a detachable manner just above the storage bin 2 in the shell 1, the bracket 7 is connected to the shell 1 by threads, the top of the connecting column 30 is open, and the bracket 7 is provided with a bolt 70 coaxially arranged with the connecting column 30, the bolt 70 is threadedly matched with the bracket 7, and its lower end portion is provided with a piston 71 adapted to the inner diameter of the connecting column 30, and the position of the piston 71 is adapted to the sliding stroke of the connecting column 30. Specifically, the height of the piston 71 is adjusted mainly by adjusting the screw-in depth of the bracket 7 and the screw-in depth of the bolt 70 to match different storage bin 2 structures, mainly to ensure that after the liquid outlet 21 is connected with the liquid inlet 31, at the end of the continuous upward process of the connecting column 30, the piston 71 will inevitably extend into the connecting column 30, and axial relative displacement will occur between the two, thereby pushing the foam discharge agent in the connecting column 30 to be discharged from the drainage hole 32 better and faster.

[0052] The bracket 7 has at least two insertion holes 72 opened along the thickness direction thereof, and the insertion holes 72 can be used for pliers to be inserted to better rotate and threadably fit in the housing 1 .

[0053] In specific implementation, the lower end of the housing 1 has a plug 6 that matches its thread. Figure 2 As shown, in the initial state, the slide 3 is against the plug 6, the downward stroke of the slide 3 is limited by the plug 6, and the upward stroke is limited by the top of the slide groove 12. By adjusting the screw-in depth of the plug 6 and the elastic force value of the reset spring 5, the sliding stroke of the slide 3 can be adjusted. The setting of the plug 6 can also better adjust the pre-tilt posture of the connecting rod 4. The inner side of the lower end of the plug 6 is inwardly tapered along its axial direction, so that it can better guide the plunger to be centered as a whole at the moment of contact with the bottom hole buffer, ensuring that the bottom center of the slide 3 collides with the bottom hole buffer.

[0054] refer to Figures 1 to 12 The gas lift plunger based on the composite drainage gas production process shown mainly converts the impact force of the plunger falling and the bottom hole buffer into a torsional force on the storage bin 2, so as to realize the mixed release of the foaming agent or the single periodic slow release, etc. In the specific design, the impact force that may be generated by falling into the bottom hole can be calculated according to the general depth of the bottom hole liquid accumulation, the position of the bottom hole buffer, the overall weight of the plunger (without the foaming agent), and other parameters, and then the sliding stroke of the slide seat 3 is calculated based on this impact force, that is, the minimum sliding stroke of the slide seat 3 and the minimum storage bin 2 are calculated according to the impact force. The torsion angle is determined, and the upper stop position of the slide groove 12 is determined at the same time, ensuring that the end point of the impact force is borne by the shell 1, which is beneficial to reducing the impact force on the storage bin 2 and extending its service life. According to the minimum sliding stroke calculated above, the relative positions of the liquid outlet 21 and the liquid inlet 31 are determined to ensure that within the sliding stroke, there will inevitably be a moment when the liquid outlet 21 and the liquid inlet 31 overlap and connect, or after the liquid outlet 21 and the liquid inlet 31 overlap, they are staggered again until the connecting column 30 cooperates with the piston 71 and finally resets the stroke change.

[0055] During installation, the storage bin 2, the slide seat 3, the pressure-driven rotation mechanism and the reset spring 5 can be assembled first, and then the assembled whole can be installed from the lower end of the shell 1, and the storage bin 2 can be fixed by the bearing 13. The slide seat 3 can slide with the slide groove 12 through the protrusion 33, and then the plug 6 can be installed. By adjusting the screw-in depth of the plug 6, the posture of the connecting rod 4 can be adjusted to ensure that it is in a pre-tilted posture in its initial state. At this time, the reset spring 5 is in a pre-stressed state, and then according to the designed sliding stroke, the bracket 7 with the piston 71 is installed above the storage bin 2. Finally, the recovery head 11 is installed on the upper end of the shell 1 to complete the installation. During use, the effective use period of the foaming agent in the plunger can be roughly calculated according to the frequency of the cycle, and new foaming agent can be injected into the storage bin 2 in time.

[0056] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A gas lift plunger based on a composite drainage gas recovery process, comprising a hollow cylindrical shell (1), characterized in that: The shell (1) has an open bottom, and contains a storage bin (2) and a slide seat (3) disposed vertically opposite to each other, wherein the slide seat (3) is slidably matched with the shell (1) and can slide along the axial direction of the shell (1), and the storage bin (2) is rotatably disposed in the shell (1) and can rotate along the central axis of the shell (1); The middle part of the slide seat (3) has a connecting column (30) coaxially arranged with the storage bin (2); the storage bin (2) has a through hole (20) adapted to the connecting column (30); the connecting column (30) is a hollow structure with a liquid inlet (31) thereon; a liquid outlet (21) communicating with the storage bin (2) is provided on a side wall of the through hole (20); the bottom of the slide seat (3) has a liquid discharge hole (32) communicating with the connecting column (30); in an initial state, the liquid inlet (31) is located below the liquid outlet (21); The storage bin (2) and the slide seat (3) are connected via a pressure-driven rotation mechanism. When the slide seat (3) is subjected to an axial pressure toward the storage bin (2), the slide seat (3) slides toward the storage bin (2) and drives the storage bin (2) to rotate via the pressure-driven rotation mechanism. The liquid outlet (21) and the liquid inlet (31) at least partially overlap, so that the liquid foam discharge agent in the storage bin (2) is discharged through the liquid discharge hole (32).

2. The gas lift plunger based on the composite drainage gas production process according to claim 1, characterized in that: The pressure-driven rotation mechanism comprises at least three connecting rods (4) uniformly distributed along the circumference of the connecting column (30), the upper and lower ends of each connecting rod (4) being respectively connected to the storage bin (2) and the slide seat (3) via a ball joint structure (40), and the upper end connection point of each connecting rod (4) being located on the circumferential outer side of the lower end connection point.

3. The gas lift plunger based on the composite drainage gas production process according to claim 2, characterized in that: In the initial state, the connecting rod (4) is arranged to be inclined in a cross-section relative to the central axis of the connecting column (30).

4. The gas lift plunger based on the composite drainage gas production process according to any one of claims 1 to 3, characterized in that: A return spring (5) is provided between the storage bin (2) and the slide seat (3), the return spring (5) being sleeved on the connecting column (30), and the upper and lower ends of the return spring (5) respectively abut against the storage bin (2) and the slide seat (3).

5. The gas lift plunger based on the composite drainage gas production process according to claim 1, characterized in that: The storage bin (2) has at least two chambers (22) distributed circumferentially or axially along the connecting column (30), and each chamber (22) has a liquid outlet (21) corresponding to one of the chambers.

6. The gas lift plunger based on the composite drainage gas production process according to claim 1 or 5, characterized in that: A sealing ring A is provided on the side wall of the through hole (20) corresponding to the liquid outlet (21), and a sealing ring B is provided on the side walls at the upper and lower ends of the through hole (20).

7. The gas lift plunger based on the composite drainage gas production process according to claim 1, characterized in that: The sliding seat (3) comprises an integrally formed sliding portion (3a) and a pressure-bearing portion (3b), wherein the sliding portion (3a) is slidably matched with the housing (1), and the bottom of the pressure-bearing portion (3b) is a pressure-bearing spherical surface (34).

8. The gas lift plunger based on the composite drainage gas production process according to claim 7, characterized in that: The lower end of the pressure-bearing portion (3b) is in an inverted cone shape, and the outlet ends of the drainage holes (32) are distributed on the cone surface.

9. The gas lift plunger based on the composite drainage gas production process according to claim 1, 7 or 8, characterized in that: The lower end of the housing (1) has a plug (6) threadedly matched therewith. In an initial state, the sliding seat (3) abuts against the plug (6), and the inner side of the lower end of the plug (6) is in the shape of a tapered hole that is axially contracted inward.

10. The gas lift plunger based on the composite drainage gas production process according to claim 1, characterized in that: The housing (1) has a bracket (7) disposed in a detachable manner just above the storage bin (2); the top of the connecting column (30) is open; the bracket (7) has a bolt (70) disposed coaxially with the connecting column (30); the bolt (70) is threadedly engaged with the bracket (7); the lower end of the bolt (70) has a piston (71) adapted to the inner diameter of the connecting column (30); and the position of the piston (71) is adapted to the sliding stroke of the connecting column (30).

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