A gas well full life cycle completion gas production device and process method

Abstract

The application belongs to the technical field of gas field completion, and particularly relates to a gas well full life cycle completion gas production device and process method. The device comprises an upper joint, a lower joint, a first outer cylinder, a first connecting pipe, a second outer cylinder, a second connecting pipe, a third outer cylinder and a gas nozzle seat connected in sequence through threads, O-rings are arranged at the thread connection positions, the inner wall of the first outer cylinder is provided with a first communication structure for connecting or separating the inner and outer spaces of the first outer cylinder according to the life cycle of the gas well, the inner wall of the second outer cylinder is provided with a second communication structure for connecting or separating the inner and outer spaces of the second outer cylinder according to the life cycle of the gas well. The first communication structure and the second communication structure are arranged to realize the full life cycle completion gas production of the gas well from the initial completion to abandonment, the cost of fishing operations of the preset throttle and the slip throttle is saved, and the downhole accidents caused by the fishing failure of the two throttles are avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas field completion, and particularly relates to a gas well full life cycle completion gas production device and process method. BACKGROUND

[0002] The high-pressure period of a gas well in a tight gas field is short, and the low-pressure period is long, and 75% of the cumulative gas production is produced in the low-pressure period, so it is particularly important to select a gas production process technology suitable for the full life cycle production of a low-pressure and low-yield gas well. Although the gas production process is mature, the segmented implementation of the main process measures has poor effect and high cost.

[0003] At present, there are contradictions between fracturing fluid flowback and downhole throttling in the field application process of the continuous oil pipe completion of the tight gas well, which specifically embodies that: on the one hand, before the gas well is put into the continuous oil pipe completion, only the large casing with a diameter of 114.3 mm is used to flow back the fracturing fluid, and after the completion, the continuous oil pipe with a small pipe diameter of 50.8 mm is used to flow back the fracturing fluid; on the other hand, since the ground gas pipeline network generally adopts medium and low pressure gathering and transportation, the downhole throttling process must be used to reduce the oil pressure at the wellhead when the gas well completed by the continuous oil pipe with a diameter of 50.8 mm is produced, and the throttling nozzle used in the downhole throttling process has an outer diameter of only 3-8 mm, which seriously affects the flowback of the fracturing fluid. At present, there are two methods: one is to install a pre-set type throttle working cylinder at the tail of the pipe when the continuous oil pipe is completed, and to put the throttling core (including the throttling nozzle) through wireline operation after the fracturing fluid is completely flowback, and the throttling core cannot be set and sealed once there is sand accumulation and scaling at the working cylinder; the other is to put the slip type downhole throttle into the middle of the continuous oil pipe through wireline operation, and since the maximum outer diameter of the slip type downhole throttle is only 38 mm, the overall strength of the tool is low, and it is easy to be pulled off and difficult to be fished. If the throttle cannot be fished, the subsequent plunger gas lift and other water drainage and gas production processes cannot be implemented, which seriously affects the production of the gas well. Therefore, a new completion process and tool are urgently needed, which can realize the sealing of the continuous oil pipe, the full-bore continuous oil pipe flowback of the fracturing fluid, the downhole throttling production, the full-bore speed pipe column water drainage and gas production, and the plunger gas lift water drainage and gas production to the abandonment of the gas well by pre-installing a special tool at the tail end of the continuous oil pipe during the completion of the continuous oil pipe. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application aims to provide a gas well full life cycle completion gas recovery device and process method, which realizes the following stages after completion: the first stage: sealing the coiled tubing when running in hole, preventing the wellbore from producing natural gas; the second stage: full bore coiled tubing and side port backflow fracturing fluid, improving the fracturing fluid backflow rate, and ensuring the smooth production of the gas well; the third stage: downhole throttling production, preventing hydrate freezing and plugging in the wellbore, and reducing the wellhead pressure to the gathering system pressure; the fourth stage: full bore coiled tubing and side port speed string drainage gas recovery production, ensuring stable liquid carrying production of the gas well for a period of time; the fifth stage: plunger gas lift to discharge the wellbore fluid accumulated in the fourth stage, and then plunger gas lift production until the gas well is abandoned.

[0005] To achieve the above object, the present application provides the following technical scheme:

[0006] A gas well full life cycle completion gas recovery device, comprising an upper joint, a lower joint, a first outer cylinder, a first connecting pipe, a second outer cylinder, a second connecting pipe, a third outer cylinder and a gas nozzle seat connected in sequence by threads, and a sealing structure is arranged at the thread connection,

[0007] The inner wall of the first outer cylinder is provided with a first communication structure, which is used to connect or separate the inner and outer spaces of the first outer cylinder according to the life cycle of the gas well;

[0008] The inner wall of the second outer cylinder is provided with a second communication structure, which is used to connect or separate the inner and outer spaces of the second outer cylinder according to the life cycle of the gas well.

[0009] Optionally, a gas nozzle is inserted into the gas nozzle seat, one end of the gas nozzle is inserted into the gas nozzle seat, the other end of the gas nozzle is provided with a pressure cap, the pressure cap is connected with the gas nozzle seat through threads, a sand prevention cover is arranged on the outside of the pressure cap, the sand prevention cover is connected with the gas nozzle seat through threads, and a sealing structure is arranged at the thread connection.

[0010] Optionally, the inner cavity of the upper joint is provided with a tapered slip and a tapered sleeve.

[0011] Optionally, the first communication structure comprises a first shear pin, an upper sliding sleeve and a first outlet, the inner wall of the first outer cylinder is fixedly connected with the upper sliding sleeve through the first shear pin, the cylinder wall of the first outer cylinder is provided with the first outlet, the upper sliding sleeve covers the first outlet, and the flow area of the first outlet is not less than the flow area of the coiled tubing.

[0012] Optionally, the second communication structure comprises a second shear pin, a lower sliding sleeve, a second outlet and a plug head, the inner wall of the second outer cylinder is fixedly connected with the outer wall of the lower sliding sleeve through the second shear pin, the cylinder wall of the second outer cylinder is provided with the second outlet, the lower sliding sleeve is provided with a through hole corresponding to the position of the second outlet, the lower sliding sleeve is provided with the plug head, one end of the plug head covers the through hole, the other end of the plug head is provided with a limiting block and is connected with the second connecting pipe through a third shear pin, and one end of the limiting block of the second connecting pipe is provided with a limiting groove.

[0013] Optionally, the second outer cylinder is a variable-diameter pipe, the inner diameter of one end of the second outer cylinder close to the first connecting pipe is smaller than the inner diameter of the other end close to the second connecting pipe.

[0014] The lower sliding sleeve is located at one end of the second outer cylinder close to the first connecting pipe, the end of the lower sliding sleeve close to the second connecting pipe is provided with a check spring, the check spring is located between the second outer cylinder and the lower sliding sleeve, one end of the check spring is attached to the inner wall of the second outer cylinder, and the other end of the check spring is fixedly connected with the lower sliding sleeve through a pin, and the check spring is in a compressed state.

[0015] Optionally, one end of the second connecting pipe close to the third outer cylinder is provided with a check assembly, the check assembly is in a compressed state, one end of the check assembly is fixedly connected with the inner wall of the second connecting pipe through a pin, and the other end of the check assembly is fixed by a soluble material.

[0016] Optionally, the gas well full life cycle completion gas recovery device further comprises a soluble ball, a steel ball and a plunger,

[0017] The outer diameter of the soluble ball is greater than the inner diameter of the lower sliding sleeve and smaller than the inner diameters of the first connecting pipe and the second outer cylinder, the soluble ball gradually dissolves after encountering fracturing fluid or water, and can be completely dissolved within 30 days.

[0018] The outer diameter of the steel ball is greater than the inner diameter of the upper sliding sleeve and smaller than the inner diameter of the first outer cylinder.

[0019] The size of the plunger is adapted to the inner diameter of the upper joint.

[0020] The soluble ball, the steel ball and the plunger are used to be sequentially put into the gas recovery device from the upper joint according to the life cycle of the gas well.

[0021] Optionally, the strengths of the third shear pin, the second shear pin and the first shear pin are increased in turn.

[0022] On the other hand, the present application discloses a gas well full life cycle completion gas recovery process method, which adopts the above device for completion and gas recovery, comprising:

[0023] S1. Insert the coiled tubing into the inner cavity of the upper joint, the tapered slip, the cone sleeve and the lower joint until it is locked, lower the coiled tubing and the gas recovery device into the casing until the preset depth, and sequentially complete the coiled tubing suspension, pipe cutting, sealing and gas well mouth installation.

[0024] S2. Nitrogen is punched into the coiled tubing and gradually pressurized, the third shear pin is sheared off, the plug falls into the sand control cover, the second outlet is opened, and the fracturing fluid is flowed back;

[0025] S3. A soluble ball is thrown into the coiled tubing to the lower sliding sleeve, nitrogen is punched into the coiled tubing and gradually pressurized, the soluble ball and the lower sliding sleeve are pushed to move together, so that the second shear pin is sheared off, until the lower sliding sleeve moves to the connecting pipe, the second outlet is closed, the lower sliding sleeve is lowered to the enlarged diameter of the second outer cylinder, the compressed check spring is elongated, so that the lower sliding sleeve is prevented from moving back to the original position, and the soluble ball is completely dissolved after contacting the fracturing fluid or water, and the downhole choke production is started;

[0026] S4. When the gas well is produced, the soluble material at one end of the check assembly is dissolved by the water in the wellbore, and the compressed check assembly is radially elongated, so that the plug is prevented from returning to the initial position and plugging the coiled tubing;

[0027] S5. When the gas well uses downhole throttling production, and the wellbore starts to accumulate liquid, a steel ball is thrown into the coiled tubing to the upper sliding sleeve, nitrogen is punched into the coiled tubing and gradually pressurized, the steel ball and the upper sliding sleeve are pushed to move together, so that the first shear pin is sheared off, until the upper sliding sleeve moves to the connecting pipe, the first outlet is opened, and the coiled tubing is used as a velocity string to discharge the wellbore liquid;

[0028] S6. When the wellbore of the gas well accumulates liquid again, a plunger is thrown into the coiled tubing to the upper joint, the gas production device is used as the receiver of the plunger, and the plunger is used for water discharge and gas production until the gas well reaches the abandonment pressure.

[0029] The technical effects and advantages of the present application are as follows:

[0030] The present application realizes the functions of running in with pressure, fracturing fluid flowback, downhole throttling production, velocity string water discharge and gas production, and plunger water discharge and gas production in sequence, covers the whole life cycle of the gas well from the initial completion to abandonment, ensures the orderly connection of various water discharge and gas production measures, saves the operation cost of the pre-installed throttle and the slip throttle, and avoids the downhole accidents caused by the failure of the two throttle operations.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or will be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structures particularly pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the first communication structure of the present application;

[0033] Figure 2Structure diagram of second communication structure of the present application;

[0034] Figure 3 Diagram of the device of the present application in connection with coiled tubing and under pressure pipe lowering;

[0035] Figure 4 Diagram of the device of the present application in connection with coiled tubing and under pressure pipe lowering;

[0036] Figure 5 Diagram of the device of the present application in connection with coiled tubing and under pressure pipe lowering;

[0037] Figure 6 Diagram of the device of the present application in connection with coiled tubing and under pressure pipe lowering;

[0038] Figure 7 Diagram of the device of the present application in connection with coiled tubing and under pressure pipe lowering;

[0039] Figure 8 Diagram of the device of the present application in connection with coiled tubing and under pressure pipe lowering.

[0040] The drawings show that: 1, upper joint; 2, tapered slip; 3, cone sleeve; 4, lower joint; 5, first shear pin; 6, first outlet; 7, upper sleeve; 8, first outer cylinder; 9, first connecting pipe; 10, second outer cylinder; 11, lower sleeve; 12, second shear pin; 13, second outlet; 14, check spring; 15, plug head; 16, third shear pin; 17, second connecting pipe; 18, check assembly; 19, third outer cylinder; 20, air nozzle seat; 21, air nozzle; 22, pressure cap; 23, sand prevention cover; 24, soluble ball; 25, steel ball; 26, plunger. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] To overcome the shortcomings of the existing technology, the present invention provides a gas well completion and production device for the entire life cycle of a gas well, comprising an upper connector 1, a lower connector 4, a first outer cylinder 8, a first connecting pipe 9, a second outer cylinder 10, a second connecting pipe 17, a third outer cylinder 19, and a gas nozzle seat 20 connected sequentially by threaded connections. Each threaded connection is equipped with a sealing structure, such as an O-ring seal. The inner wall of the first outer cylinder 8 is provided with a first connecting structure, which is used to connect or separate the inner and outer spaces of the first outer cylinder 8 according to the gas well's life cycle. The inner wall of the second outer cylinder 10 is provided with a second connecting structure, which is used to connect or separate the inner and outer spaces of the second outer cylinder 10 according to the gas well's life cycle.

[0043] Optionally, an air nozzle 21 is inserted into the air nozzle seat 20. One end of the air nozzle 21 is inserted into the air nozzle seat 20, and the other end is provided with a pressure cap 22. The pressure cap 22 is connected to the air nozzle seat 20 by a thread. A sandproof cover 23 is provided on the outside of the pressure cap 22. The sandproof cover 23 is connected to the air nozzle seat 20 by a thread. A sealing structure, such as an O-ring seal, is provided at the thread connection.

[0044] Optionally, the inner cavity of the upper connector 1 is provided with a tapered slip 2 and a tapered sleeve 3.

[0045] Optional, Figure 1 This is a schematic diagram of the first connected structure, as shown below. Figure 1 As shown, the first connecting structure includes a first shear pin 5, an upper sliding sleeve 7, and a first outlet 6. The inner wall of the first outer cylinder 8 is fixedly connected to the upper sliding sleeve 7 through the first shear pin 5. The cylinder wall of the first outer cylinder 8 is provided with the first outlet 6. The upper sliding sleeve 7 covers the first outlet 6. The flow area of ​​the first outlet 6 is not less than the flow area of ​​the continuous tubing.

[0046] Optional, Figure 2 This is a schematic diagram of the second connected structure, as shown below. Figure 2 As shown, the second connecting structure includes a second shear pin 12, a sliding sleeve 11, a second outlet 13, and a plug head 15. The inner wall of the second outer cylinder 10 is fixedly connected to the outer wall of the sliding sleeve 11 by the second shear pin 12. The cylinder wall of the second outer cylinder 10 is provided with a second outlet 13. The sliding sleeve 11 is provided with a through hole at the position corresponding to the second outlet 13. A plug head 15 is provided inside the sliding sleeve 11. One end of the plug head 15 covers the through hole. The other end of the plug head 15 is provided with a limit block and is connected to the second connecting pipe 17 by a third shear pin 16. The second connecting pipe 17 is provided with a limit groove at one end corresponding to the limit block.

[0047] Optionally, the second outer cylinder 10 is a reducing pipe, and the inner diameter of the end of the second outer cylinder 10 near the first connecting pipe 9 is smaller than the inner diameter of the end near the second connecting pipe 17.

[0048] The lower sliding sleeve 11 is located at one end of the second outer tube 10 close to the first connecting pipe 9, and the lower sliding sleeve 11 is provided with a check spring 14 at one end close to the second connecting pipe 17, the check spring 14 is located between the second outer tube 10 and the lower sliding sleeve 11, one end of the check spring 14 is attached to the inner wall of the second outer tube 10, and the other end of the check spring 14 is fixedly connected with the lower sliding sleeve 11 through a pin, and the check spring 14 is in a compressed state.

[0049] Optionally, the second connecting pipe 17 is provided with a check assembly 18 at one end close to the third outer tube 19, the check assembly 18 is in a compressed state, one end of the check assembly 18 is fixedly connected with the inner wall of the second connecting pipe 17 through a pin, and the other end of the check assembly 18 is fixed by a soluble material.

[0050] Optionally, the device further comprises a soluble ball 24, a steel ball 25 and a plunger 26, the outer diameter of the soluble ball 24 is greater than the inner diameter of the lower sliding sleeve 11 and less than the inner diameters of the first connecting pipe 9 and the second outer tube 10, the soluble ball 24 gradually dissolves after being subjected to fracturing fluid or water, and can be completely dissolved within 30 days;

[0051] The outer diameter of the steel ball 25 is greater than the inner diameter of the upper sliding sleeve 7 and less than the inner diameter of the first outer tube 8;

[0052] The size of the plunger 26 is adapted to the inner diameter of the upper joint 1;

[0053] The soluble ball 24, the steel ball 25 and the plunger 26 are used for being sequentially put into the gas recovery device from the upper joint 1 according to the life cycle of the gas well.

[0054] Optionally, the strengths of the third shear pin 16, the second shear pin 12 and the first shear pin 5 are sequentially increased, so that the shear pins are sequentially sheared off when the gas is injected into the inside of the coiled tubing and the ball is pressed.

[0055] In another aspect, the application further discloses a gas well full-life cycle completion and gas recovery process method, which adopts the above device for completion and gas recovery, and comprises the following steps:

[0056] S1. The coiled tubing is inserted into the inner cavities of the upper joint 1, the tapered slip 2, the tapered sleeve 3 and the lower joint 4 until it is locked, and the coiled tubing and the gas recovery device are lowered into the casing until a preset depth, and the coiled tubing suspension, pipe cutting, sealing and gas well mouth installation are sequentially completed;

[0057] S2. Nitrogen is injected into the inside of the coiled tubing and gradually pressurized, so that the third shear pin 16 is sheared off, the plug head 15 falls into the sand prevention cover 23, the second outlet 13 is opened, and the fracturing fluid is returned and drained;

[0058] S3. Dissolve the soluble ball 24 into the coiled tubing and place it into the sliding sleeve 11. Inject nitrogen into the coiled tubing and gradually increase the pressure to push the soluble ball 24 and the sliding sleeve 11 together to shear the second shear pin 12 until the sliding sleeve 11 moves to the connecting pipe 17. Close the second outlet 13. The sliding sleeve 11 moves down to the expansion section of the second outer cylinder 10. The compressed check spring 14 extends to prevent the sliding sleeve 11 from moving up back to its original position. The soluble ball 24 completely dissolves after contacting the fracturing fluid or water. Start production using the downhole throttle.

[0059] S4. When the gas well is put into production, the soluble material at one end of the check valve assembly 18 dissolves in the water in the wellbore, and the check valve assembly 18 in the compressed state elongates radially, thereby preventing the plug head 15 from returning to the initial position and blocking the coiled tubing.

[0060] S5. When the gas well adopts downhole throttling production and the wellbore begins to accumulate fluid, steel ball 25 is thrown into the coiled tubing to the upper sliding sleeve 7. Nitrogen gas is injected into the coiled tubing and gradually pressurized to push steel ball 25 and upper sliding sleeve 7 to move together, thereby shearing the first shear pin 5 until the upper sliding sleeve 7 moves to the connecting pipe 9 and the first outlet 6 is opened, using the coiled tubing as a velocity string to discharge the wellbore fluid.

[0061] S6. When liquid accumulates again in the wellbore, plunger 26 is inserted into the coiled tubing to the upper connector 1. The gas production device is used as the receiver of plunger 26. Plunger 26 is used to drain water and produce gas until the gas well reaches the abandoned pressure.

[0062] The following is an example of completing a well with Φ50.8mm coiled tubing under pressure after fracturing with Φ114.3mm casing. The specific operation procedure is as follows:

[0063] 1. Insert coiled tubing under pressure

[0064] On the ground, the integrated well completion unit is arranged according to... Figure 3 After assembly as shown, insert the Φ50.8mm coiled tubing into the inner cavities of the upper connector 1, tapered slip 2, tapered sleeve 3, and lower connector 4. The upper connector 1 and lower connector 4 are then gradually tightened via threads. The upper connector 1 pushes the tapered slip 2 and tapered sleeve 3, creating relative movement and forcing the tapered slip 2 to retract and gradually grip the coiled tubing until it is locked. The coiled tubing is then pressurized using a coiled tubing installation machine. Figure 3 The device shown is lowered together with the coiled tubing into the Φ114.3mm casing until the designed depth is reached. The coiled tubing is then suspended, cut, sealed, and installed at the gas wellhead in sequence.

[0065] 2. Remove the plug and flush out the fracturing fluid.

[0066] Connect the nitrogen booster truck and other pressurization devices to the wellhead tree venting test valve, inject nitrogen into the coiled tubing and gradually increase the pressure until it reaches 3 MPa. At this point, the third shear pin 16 is sheared off. Figure 4 As shown, the plug head 15 falls into the pocket of the sand shield 23. With the fall of the plug head 15, the second outlet 13 is opened. The flow area of ​​the second outlet 13 is the same as that of the Φ50.8mm coiled tubing, ensuring that the fracturing fluid that was not completely drained by the Φ114.3mm casing can be smoothly discharged along the second outlet 13.

[0067] 3. Throw in 24 soluble balls and close the second exit 13.

[0068] like Figure 5 As shown, at the wellhead, a Φ26mm soluble ball 24 is inserted into the coiled tubing via the wellhead venting test valve and placed into the sliding sleeve 11. A nitrogen pressurization device, such as a nitrogen truck, is connected to the wellhead venting test valve to inject nitrogen into the coiled tubing and gradually increase the pressure. The outer diameter of the soluble ball 24 is larger than the inner diameter of the sliding sleeve 11. The high-pressure nitrogen pushes the soluble ball 24 and the sliding sleeve 11 together, thereby shearing the second shear pin 12 until the sliding sleeve 11 moves to the second connecting pipe 17. The outer diameter of the sliding sleeve 11 is larger than the inner diameter of the second connecting pipe 17. At this point, the second outlet 13 is closed as the sliding sleeve 11 moves. The sliding sleeve 11 moves down to the expansion section of the second outer cylinder 10, and the check spring 14, which was originally compressed, extends, preventing the sliding sleeve 11 from moving back to its original position. The soluble ball 24 completely dissolves upon contact with fracturing fluid or water, and production begins using a downhole throttle.

[0069] 4. Downhole production throttling

[0070] During well production, high-pressure natural gas and other fluids flow sequentially through the sand shield 23, pressure cap 22, and gas nozzle 21, entering the coiled tubing and reaching the surface gathering and transportation network. Because the gas nozzle 21 has a diameter of 2-8mm, the high-pressure natural gas passing through it creates a throttling and pressure-reducing effect, thus achieving downhole throttling production in the gas well. Figure 6 As shown, when natural gas flows at high speed in the wellbore, it may impact the plug head 15 and move it upward, or even return to its initial position and block the coiled tubing. Since the soluble material at one end of the check assembly 18 dissolves in the water in the wellbore, the check assembly 18, which was originally in a compressed state, recovers its deformation and elongates radially, thereby preventing the plug head 15 from returning to its initial position and blocking the coiled tubing.

[0071] 5. Throw steel balls 25, open the upper sliding sleeve, 7 speed tubing for drainage and gas production.

[0072] After a period of downhole throttling production, as the production capacity decreases, liquid begins to accumulate in the wellbore. Since the diameter of the gas nozzle 21 is 2-8mm, the flow area of ​​the liquid is small and the friction is large when the liquid flows through it, which seriously affects drainage and gas production.

[0073] like Figure 7 As shown, at the wellhead, a Φ30mm steel ball 25 is dropped into the coiled tubing via the wellhead venting test valve to the upper sliding sleeve 7. A nitrogen pressurization device, such as a nitrogen truck, is connected to the wellhead venting test valve to inject nitrogen into the coiled tubing and gradually increase the pressure. Because the outer diameter of the steel ball 25 is larger than the inner diameter of the upper sliding sleeve 7, the high-pressure nitrogen pushes the steel ball 25 and the upper sliding sleeve 7 together, thereby shearing the first shear pin 5 until the upper sliding sleeve 7 moves to the first connecting pipe 9. At this point, along with the movement of the upper sliding sleeve 7, the first outlet 6 is opened. The flow area of ​​the first outlet 6 is not less than the flow area of ​​the coiled tubing, ensuring that wellbore fluid can be effectively discharged when using Φ50.8mm coiled tubing as the velocity string.

[0074] 6. Deploy plunger 26 for drainage and gas production.

[0075] As gas well productivity declines, when production falls below the critical fluid-carrying capacity of Φ50.8mm coiled tubing, fluid accumulation re-occurs in the wellbore. At this point, if... Figure 8 As shown, a Φ38mm plunger 26 is inserted into the coiled tubing through the venting test valve at the wellhead. The device of this invention can serve as a receiver for the plunger 26. The inner diameter of the upper connector 1 is adapted to the size of the plunger 26. The plunger 26 is used to drain water and produce gas until the gas well reaches the abandonment pressure. Thus, the entire life cycle of the gas well, from commissioning to abandonment, is completed.

[0076] In summary, the process of this invention sequentially realizes the following: running tubing under pressure, fracturing fluid backflow, downhole throttling production, velocity tubing drainage and gas production, and plunger gas lift drainage and gas production. It covers the entire life cycle of a gas well from initial completion to abandonment, ensuring the orderly connection of various drainage and gas production measures, saving the cost of pre-installed throttling devices and slip throttling device deployment and retrieval, avoiding downhole accidents caused by the failure of these two types of throttling devices, and meeting the full life cycle production needs of a gas well from commissioning to abandonment.

[0077] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas well completion and production device covering the entire life cycle of a gas well, characterized in that, It includes an upper connector (1), a lower connector (4), a first outer cylinder (8), a first connecting pipe (9), a second outer cylinder (10), a second connecting pipe (17), a third outer cylinder (19), and an air nozzle seat (20) connected in sequence by threaded connections. Each threaded connection is equipped with a sealing structure. The inner wall of the first outer cylinder (8) is provided with a first connecting structure, which is used to connect or separate the inner and outer spaces of the first outer cylinder (8) according to the life cycle of the gas well; The inner wall of the second outer cylinder (10) is provided with a second connecting structure, which is used to connect or separate the inner and outer spaces of the second outer cylinder (10) according to the gas well life cycle; The first connecting structure includes a first shear pin (5), an upper sliding sleeve (7) and a first outlet (6). The inner wall of the first outer cylinder (8) is fixedly connected to the upper sliding sleeve (7) by the first shear pin (5). The cylinder wall of the first outer cylinder (8) is provided with a first outlet (6). The upper sliding sleeve (7) covers the first outlet (6). The flow area of ​​the first outlet (6) is not less than the flow area of ​​the continuous tubing. The second connecting structure includes a second shear pin (12), a sliding sleeve (11), a second outlet (13), and a plug (15). The inner wall of the second outer cylinder (10) is fixedly connected to the outer wall of the sliding sleeve (11) by the second shear pin (12). The cylinder wall of the second outer cylinder (10) is provided with a second outlet (13). The sliding sleeve (11) is provided with a through hole corresponding to the position of the second outlet (13). The sliding sleeve (11) is provided with a plug (15). One end of the plug (15) covers the through hole. The other end of the plug (15) is provided with a limit block and is connected to the second connecting pipe (17) by a third shear pin (16). The second connecting pipe (17) is provided with a limit groove corresponding to one end of the limit block. The second outer cylinder (10) is a reducing pipe, and the inner diameter of the end of the second outer cylinder (10) near the first connecting pipe (9) is smaller than the inner diameter of the end near the second connecting pipe (17); The sliding sleeve (11) is located at one end of the second outer cylinder (10) near the first connecting pipe (9). A check spring (14) is provided at one end of the sliding sleeve (11) near the second connecting pipe (17). The check spring (14) is located between the second outer cylinder (10) and the sliding sleeve (11). One end of the check spring (14) is in contact with the inner wall of the second outer cylinder (10). The other end of the check spring (14) is fixedly connected to the sliding sleeve (11) by a pin. The check spring (14) is in a compressed state.

2. The gas well completion and production device according to claim 1, characterized in that, An air nozzle (21) is inserted into the air nozzle seat (20). One end of the air nozzle (21) is inserted into the air nozzle seat (20), and the other end is provided with a pressure cap (22). The pressure cap (22) is connected to the air nozzle seat (20) by a thread. A sandproof cover (23) is provided on the outside of the pressure cap (22). The sandproof cover (23) is connected to the air nozzle seat (20) by a thread. A sealing structure is provided at the thread connection.

3. A gas well completion and production device for the entire life cycle of a gas well according to claim 1, characterized in that, The inner cavity of the upper connector (1) is provided with a conical slip (2) and a conical sleeve (3).

4. A gas well completion and production device for the entire life cycle of a gas well according to claim 1, characterized in that, A check valve assembly (18) is provided at one end of the second connecting pipe (17) near the third outer cylinder (19). The check valve assembly (18) is in a compressed state. One end of the check valve assembly (18) is fixedly connected to the inner wall of the second connecting pipe (17) by a pin, and the other end of the check valve assembly (18) is fixed by a soluble material.

5. A gas well completion and production device according to claim 4, characterized in that, It also includes soluble balls (24), steel balls (25) and plungers (26). The outer diameter of the soluble ball (24) is larger than the inner diameter of the sliding sleeve (11) and smaller than the inner diameter of the first connecting pipe (9) and the second outer cylinder (10). The soluble ball (24) gradually dissolves after encountering fracturing fluid or water and can be completely dissolved within 30 days. The outer diameter of the steel ball (25) is larger than the inner diameter of the upper sliding sleeve (7) and smaller than the inner diameter of the first outer cylinder (8); The plunger (26) is sized to fit the inner diameter of the upper connector (1); The soluble ball (24), steel ball (25) and plunger (26) are used to sequentially engage the gas production device from the upper connector (1) according to the gas well life cycle.

6. A gas well completion and production device according to claim 1, characterized in that, The strength of the third shear stud (16), the second shear stud (12), and the first shear stud (5) increases sequentially.

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