Hydrocarbon well drainage gas recovery assembly tool string

Abstract

This invention discloses a combined tool string for drainage and gas production in oil and gas wells, comprising a drainage and gas production surface tool string and a drainage and gas production downhole tool string arranged sequentially. The surface tool string includes a blowout relief tool and a wellbore that are fixedly connected. The downhole tool string includes a rope cap, a weight bar, a bidirectional impact tool, an anti-upward slip device, and a dual suction system that are threaded together sequentially. A steel wire rope is pulled out from the blowout relief tool and passes through the wellbore, rope cap, weight bar, bidirectional impact tool, anti-upward slip device, and dual suction system sequentially from top to bottom. This invention's tool string features a reliably sealed steel wire rope. During high pressure in the wellbore, the blowout relief provides a buffer for the tool string reaching the wellhead at high speed, preventing upward movement of the tool string. It results in minimal leakage and slippage, high drainage and gas production efficiency, improved operational efficiency, and reduced operating costs, meeting the practical needs of oil and gas fields for cost reduction and efficiency improvement.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas field development and production equipment, and relates to a combined tool string for draining and producing oil and gas wells. Background Technology

[0002] Existing technologies for draining and producing gas from oil and gas wells often employ closed-loop gas well drainage skids and traditional mechanical pumping equipment. However, this frequently results in problems such as unsealed or failed wire ropes, inability to release pressure in a timely manner under high pressure in the wellbore, unbuffered high-speed upward movement of the downhole drainage and gas production tool string, wire rope detachment, tool jamming, upward movement of the tool string, large leakage due to slippage during drainage and gas production, and low drainage and gas production efficiency. These issues fail to meet the current needs of oil and gas fields for cost reduction and efficiency improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a combined tool string for draining and producing gas in oil and gas wells, which solves the problem of easy loosening of steel wire ropes in the prior art.

[0004] The technical solution adopted in this invention is an oil and gas well drainage and gas production combined tool string, which includes a drainage and gas production wellhead tool string and a drainage and gas production wellhead tool string arranged sequentially.

[0005] The tool string for drainage and gas production wells includes a fixedly connected venting and pressure relief tool and wellbore.

[0006] The downhole tool string for drainage and gas production includes a rope cap, a weight bar, a bidirectional shock tool, an anti-upward slip device, and a dual suction system connected in sequence by threads.

[0007] A steel wire rope is pulled out from the blowout relief tool and threaded from top to bottom through the wellbore, rope cap, weight bar, bidirectional shock tool, anti-upward slip device, and dual suction system.

[0008] The invention is further characterized by:

[0009] The blowout relief tool includes a riser with a blowout hole channel machined on one side. A blowout pipe connected to the blowout hole channel is welded onto the riser. A plug is threaded to the end of the blowout pipe away from the riser. A blowout valve is threaded to the middle of the blowout pipe. A buffer spring is also installed inside the riser. A lower stabilizer and an upper stabilizer are respectively sleeved at both ends of the buffer spring. The riser is threaded to the body. A cone seat is placed inside the body. A cone is placed inside the cone seat. A semi-circular clamp is in contact with the cone. A screw is provided outside the semi-circular clamp. A sealing core is placed inside the semi-circular clamp. A sealing box is in contact with the end face of the cone seat. A sealing ring is placed inside the sealing box. A pressure cap is in contact with the sealing ring. A pressure cover is in contact with the pressure cap. The pressure cover is threaded to the body. The riser is threaded to the wellbore.

[0010] The inner conical rope cap includes a rope cap body, an inner cone of the rope cap is installed inside the rope cap body, and a weight bar is threadedly connected to the rope cap body;

[0011] The bidirectional shock tool includes an upper connector, which is connected to a weight bar. The upper connector is inserted into the housing. The upper connector has a spring that is sleeved and a stop cap that is threaded. The housing is threaded to an intermediate connector. The intermediate connector is sleeved to a lower connector. The lower connector is sleeved to a compression spring. The intermediate connector has a special pressure cap that is threaded to the lower connector. The lower connector is threaded to an anti-upward slip device.

[0012] The anti-upward slip device includes a male connector, which connects to the lower connector. The male connector is threaded to an intermediate short section, which has a coupling installed inside. A slip is fitted onto the annular groove of the intermediate short section. A movable conical mandrel is threaded to the coupling. A retaining ring is welded to the outer diameter of the movable conical mandrel, and a clamp is welded to the retaining ring. The clamp, retaining ring, and slip are all in contact with each other. The intermediate short section is in contact with the movable conical mandrel. A ball seat is threaded to the movable conical mandrel. The ball seat is in contact with the inner hole of the sliding sleeve. The sliding sleeve is threaded to a male and female connector. A ball is placed in the cavity formed by the sliding sleeve, ball seat, and male and female connector. The male and female connectors are threaded to a dual suction system.

[0013] The dual suction system includes a main shaft, which is connected to a male and female connector. The main shaft is fixed to a fixed sleeve with steel nails. A spring fixing seat and an adjustable spring are installed on the main shaft. A metal spring is installed in the limiting groove of the fixed sleeve. A transition shaft is threaded to the main shaft. A limiting sleeve is connected to the inner hole of the transition shaft. A sealing seat is threaded to the limiting sleeve. A return spring is installed on the sealing seat. The return spring is connected to the transition shaft. An expansion sealing sleeve is threaded to the outer diameter of the transition shaft. A screw plug is installed at one end of the expansion sealing sleeve on the outer diameter of the transition shaft. A male and female ball seat is threaded to the transition shaft. One end of the male and female ball seat is connected to a steel ball, and the other end is threaded to a tapered connector. An upper bypass hole and a lower bypass hole are machined on the main shaft.

[0014] The cone is made of aluminum alloy, the sealing core is made of rubber, and the sealing ring is made of polymer material;

[0015] Both the springs and compression springs are made of stainless steel.

[0016] The ball seat contacts the ball, and the movable conical mandrel allows the slips to open. The slips are fitted into the annular groove of the middle short section and are limited by clamps and retaining rings.

[0017] The steel ball is in contact with the sealing seat.

[0018] The beneficial effects of this invention are:

[0019] 1. The tool string has a securely sealed steel wire rope to prevent the steel wire rope from coming loose. It can release pressure when the well is under high pressure and acts as a buffer for the downhole drainage and gas production tool string that reaches the wellhead at high speed in the well.

[0020] 2. Features bidirectional shock absorption to prevent tool jamming and tool string from moving upwards;

[0021] 3. It features a dual-sealed liquid column, resulting in minimal leakage and slippage, and high efficiency in drainage and gas extraction.

[0022] 4. It can greatly improve operational efficiency, save operational costs, and meet the current needs of oil and gas fields for cost reduction and efficiency improvement. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the aboveground working string structure of the oil and gas well drainage and gas production combined tool string of the present invention;

[0024] Figure 2 This is a schematic diagram of the downhole working string structure of the oil and gas well drainage and gas production combined tool string of the present invention;

[0025] Figure 3 This is a schematic diagram of the blowout relief and pressure relief tool structure of the oil and gas well drainage and gas production combined tool string of the present invention;

[0026] Figure 4 This is a schematic diagram of the conical rope cap structure of the oil and gas well drainage and gas production combination tool string of the present invention;

[0027] Figure 5 This is a schematic diagram of the weight bar structure of the oil and gas well drainage and gas production combination tool string of the present invention;

[0028] Figure 6 This is a schematic diagram of the bidirectional shock tool structure of the oil and gas well drainage and gas production combined tool string of the present invention;

[0029] Figure 7 This is a schematic diagram of the anti-upward slip device structure of the oil and gas well drainage and gas production combination tool string of the present invention;

[0030] Figure 8 This is a schematic diagram of the dual suction system structure of the oil and gas well drainage and gas production combination tool string of the present invention.

[0031] In the diagram, 1. Venting and pressure relief tool, 101. Riser, 102. Venting pipe, 103. Plug, 104. Venting valve, 105. Lower stabilizer, 106. Buffer spring, 107. Upper stabilizer, 108. Body, 109. Cone seat, 110. Cone, 111. Lead screw, 112. Semi-circular clamp, 113. Sealing core, 114. Sealing box, 115. Sealing ring, 116. 1. Pressure cap, 117. Pressure cap, 118. Spray outlet channel, 119. Steel wire rope; 2. Rope cap, 201. Rope cap body, 202. Inner cone of rope cap; 3. Weight bar; 4. Two-way shock tool, 401. Upper connector, 402. Housing, 403. Spring, 404. Stop cap, 405. Intermediate connector, 406. Special pressure cap, 407. Compression spring, 408. Lower connector; 5. Anti-upward slip clip 501. Male connector, 502. Intermediate short section, 503. Coupling, 504. Collar, 505. Movable tapered mandrel, 506. Clamp, 507. Snap ring, 508. Sliding sleeve, 509. Ball seat, 510. Ball, 511. Male and female connector; 6. Dual suction system, 601. Main shaft, 602. Steel nail, 603. Fixing sleeve, 604. Spring fixing seat, 605 606. Adjustable spring; 607. Metal spring; 608. Transition shaft; 609. Limiting sleeve; 610. Expanding sealing sleeve; 611. Screw plug; 612. Return spring; 613. Sealing seat; 614. Steel ball; 615. Male and female ball seat; 616. Tapered joint; 617. Tail hole; 618. Upper bypass hole; 619. Lower bypass hole; 620. Fluid cavity; 63. Fluid hole; 7. Wellbore. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] This invention provides a combined tool string for draining and producing gas from oil and gas wells, such as... Figure 1 , Figure 2 As shown, the tool includes a blowout relief tool 1, which is threadedly connected to the wellbore 7, forming the aboveground part of the tool string of the present invention. The blowout relief tool 1 has a steel wire rope 119 at its center, and the end of the steel wire rope 119 is connected to a rope cap 2. The rope cap 2, the weight bar 3, the bidirectional shock tool 4, the anti-upward slip device 5, and the dual suction system 6 are all threadedly connected in sequence. The rope cap 2, the weight bar 3, the bidirectional shock tool 4, the anti-upward slip device 5, and the dual suction system 6 connected by the steel wire rope 119 constitute the downhole tool string part of the drainage and gas production operation of the present invention. This part of the tool string passes through the inner hole channel of the wellhead gas production tree and enters the wellbore for drainage and gas production operations.

[0034] like Figure 3As shown, the pressure relief tool 1 includes a riser 101 with a pressure relief channel 118 machined on it. The inner hole of the pressure relief channel 118 is connected to the inner hole of the pressure relief pipe 102. The pressure relief pipe 102 is welded to the riser 101 and threadedly connected to the plug 103 and the pressure relief valve 104. A lower stabilizer 105 is placed in the inner hole of the riser 101. A buffer spring 106 is installed on the small diameter of the lower stabilizer 105. One end of the buffer spring 106 is fitted onto the outer diameter of the upper stabilizer 107. The upper stabilizer 107, the body 108, and the riser 101 are all threadedly connected. A cone seat 109 is sequentially placed in the inner cavity of the body 108. A cone 110 is placed in the cone hole inside the cone seat 109. One end face of the cone 110 is connected to a semi-circular clamp 112. A sealing core 113 is placed in the inner hole of the semi-circular clamp 112. One end face of the sealing core 113 is connected to the cone seat 109 into which the cone 110 is placed. The end face of the cone seat 109 is connected to a sealing box 114. A sealing ring 115 is placed in the inner hole of the sealing box 114. The sealing ring 115 is pressed by a pressure cap 116. The pressure cap 116 is limited by a pressure cover 117. All of the above are contact connections. The pressure cover 117, the lead screw 111 and the body 108 are all threaded connections. The wire rope 119 is pulled out from the inner hole formed by the above connections.

[0035] like Figure 4 , Figure 5 As shown, the rope cap 2 includes a rope cap body 201, and the inner cone 202 of the rope cap body 201 is in contact with the inside of the rope cap body 201. The rope cap body 201 and the inner cone 202 of the rope cap form the rope cap 2, and the rope cap 2 is threadedly connected to the weight bar 3.

[0036] like Figure 6 As shown, the bidirectional vibration tool 4 includes an upper connector 401. The small-diameter end of the upper connector 401 is inserted into the inner hole of the housing 402. A spring 403 is fitted on the small-diameter end of the upper connector 401 in the inner hole of the housing 402. One end of the spring 403 is threadedly connected to the small-diameter end of the upper connector 401 by a stop cap 404. The stop cap 404 connects the upper connector 401 and the housing 402 together. The housing 402 is threadedly connected to the intermediate connector 405. A small-diameter rod of the lower connector 408 is fitted into the inner hole of the intermediate connector 405. A compression spring 407 is fitted into the small-diameter end of the lower connector 408. One end of the compression spring 407 is in contact with the intermediate connector 405. A specially made pressure cap 406 is threadedly connected to the lower connector 408 in the inner hole of the intermediate connector 405, thus connecting the intermediate connector 405 and the lower connector 408 together.

[0037] like Figure 7As shown, the anti-upward slip device 5 includes a male connector 501, which is threadedly connected to an intermediate short section 502. A coupling 503 is installed in the inner hole of the intermediate short section 502. The coupling 503 is threadedly connected to a movable tapered mandrel 505. A retaining ring 507 is welded to the outer diameter of the movable tapered mandrel 505, and a clamp 506 is welded to the retaining ring 507. The clamp 506, retaining ring 507, and slip 504 are all in contact with each other. The clamp 506 and retaining ring 507 fix and limit the slip 504. The function of 4 is that the slip plate 504 is fitted into the annular groove of the intermediate short section 502, the intermediate short section 502 is in contact with the movable tapered mandrel 505, the movable tapered mandrel 505 is threadedly connected to the ball seat 509, the ball seat 509 is in contact with the sliding sleeve 508 and placed in the inner hole of the sliding sleeve, the sliding sleeve 508 is threadedly connected to the male and female connector 511, the male and female connector 511 is in contact with the ball 510, and the ball 510 is placed in the cavity formed by the sliding sleeve 508, the ball seat 509 and the male and female connector 511.

[0038] like Figure 8 As shown, the dual suction system 6 includes a main shaft 601. The main shaft 601, the transition shaft 607, the male and female ball seats 614, and the tapered joint 615 are all threaded connections. These connections constitute the main structure of the dual suction system of the present invention. A spring fixing seat 604 and an adjustable spring 605 are installed in contact with the outer diameter hole of the main shaft 601. The adjustable spring 605 is in contact with a metal spring 606, which is installed in contact with the limiting groove of the fixing sleeve 603. The fixing sleeve 603 is fixed to the main shaft 601 by steel nails 602. An upper bypass hole 617 and a lower bypass hole 618 are machined on the outer diameter of the main shaft 601. The metal spring 606 limits the adjustable spring 605, and the adjustable spring 605 can keep the metal spring 606 in an expanded state. The upper bypass hole 617 and the lower bypass hole 618 form a normally open bypass convection channel. A limiting sleeve 608 is installed at the limiting boss in the inner hole of the transition shaft 607. The limiting sleeve 608 is threadedly connected to the sealing seat 612. A return spring 611 is installed on the rod diameter of the sealing seat 612. One end of the return spring 611 is in contact with the transition shaft 607 and is limited by the inner hole boss. An expansion sealing sleeve 609 is threadedly connected to the outer diameter of the transition shaft 607. The expansion sealing sleeve 609 and the outer diameter of the transition shaft 607 seal to form a liquid cavity 619. A liquid hole 620 and a threaded injection hole are machined on the outer diameter of the transition shaft 607. A screw plug 610 is installed in the threaded injection hole. The liquid injected by the screw plug 610 enters the liquid cavity 619 through the liquid hole 620. The sealing seat 612 and the transition shaft 607 seal to accommodate the return spring 611 and form a return spring cavity. The transition shaft 607 is threadedly connected to the male and female ball seats 614, the male and female ball seats 614 are in contact with the steel ball 613, the male and female ball seats 614 are threadedly connected to the tapered joint 615, and the tapered joint 615 has a tail hole 616 machined on its outer diameter, which is connected to the inner hole of the tapered joint 615.

[0039] The working principle of the oil and gas well drainage and gas production combination tool string of the present invention is as follows:

[0040] In the blowout relief tool 1, the sealing core 113 and sealing ring 115 seal the wire rope 119. Specifically, when the wire rope 119 is raised or lowered, it drives the cone 110 to compress the sealing core 113, thus sealing the wire rope 119. When the inner hole of the sealing core 113 is worn, the semi-circular clamp 112 is tightened to tighten the sealing core 113, again sealing the wire rope 119. In an emergency, the blowout valve 104 can be opened for safe blowout relief. When the downhole tool string for drainage and gas production reaches the wellhead at high speed and impacts the lower stabilizer 105, the lower stabilizer 105 compresses the buffer spring 106, which alleviates the impact force of the downhole tool string and protects the downhole tool string and wellbore.

[0041] The inner cone 202 of the rope cap 2 and the weight bar 3 limits and fixes the wire rope 119 to the rope cap body 201, which serves to prevent the wire rope 119 from loosening. The weight bar 3 provides gravity for the downhole tool string for drainage and gas production operations, which can smoothly lower the tool string into the target layer of the well.

[0042] When the upper connector 401 of the bidirectional shock tool 4 is released, the spring 403 releases its elastic force, and the stop cap 404 moves to complete the shock action towards the bottom of the well, compressing the upper connector 401 and indirectly compressing the compression spring 407. When the upper connector 401 is released, the compression spring 407 pushes the upper connector 401 to drive the lower connector 408 to complete the shock action towards the wellhead. This part can perform bidirectional shock action, which can realize the bidirectional unblocking of the downhole tool string when encountering obstruction during drainage and gas production operations.

[0043] The pressure inside the wellbore of the anti-upward slip device 5 causes the ball 510 to push the movable conical mandrel 505 connected to the ball seat 509 to move. The movable conical mandrel 505 causes the slip 504 to open and lock onto the inner wall of the wellbore, which prevents the downhole tool string from moving upward during drainage and gas production operations. When the lifting male connector 501 and the slip 504 retract, the tool string can be smoothly and unimpeded lifted and lowered inside the wellbore.

[0044] In the dual-suction system 6, the pressure inside the wellbore pushes the steel ball 613 to create a seal with the sealing seat 612, causing the sealing seat 612 to move and compress the return spring 611. Simultaneously, the liquid in the return spring 611 cavity enters the liquid chamber 619 through the liquid hole 620. The liquid in the liquid chamber 619 causes the expansion sealing sleeve 609 to expand, sealing the liquid column in the annular space between itself and the tubing. At the same time, part of the liquid column enters the inner hole of the main shaft 601 through the lower bypass hole 618, flows through the upper bypass hole 617, and reaches above the metal spring 606. The metal spring 606 seals part of the liquid column in the annular space formed between itself and the tubing, achieving the purpose of dual-sealing of the liquid column. The surface equipment drives the wire rope 119 to lift the downhole tool string for drainage and gas production operations, which can bring the liquid column in the wellbore out of the wellhead, completing one drainage and gas production operation and achieving the purpose of increasing production. Simultaneously, after drainage and gas extraction are completed, the wellbore pressure decreases, the steel ball 613 disengages from the sealing seat 612, and the steel ball 613 falls onto the male and female ball seats 614. At the same time, the return spring 611 pushes the sealing seat 612 to move, and the liquid in the liquid chamber 619 enters the return spring chamber through the liquid hole 620. The expanding sealing rubber sleeve 609 releases the seal with the wellbore and contracts. When the tool string is lowered into the wellbore again, the upper bypass hole 617 and the lower bypass hole 618 are connected to form a bypass liquid flow channel, which allows the tool string to fall quickly inside the wellbore.

[0045] This invention relates to a combined tool string for drainage and gas production in oil and gas wells. The tool string above ground features a securely sealed steel wire rope, pressure relief during wellbore high-pressure conditions, and a buffer against high-speed flow of the downhole tool string reaching the wellhead. The downhole tool string for drainage and gas production features anti-loosening steel wire rope, anti-jamming bidirectional shock-absorbing tools, prevention of tool string upward movement, double-sealed liquid column, and high drainage and gas production efficiency. These features significantly improve operational efficiency, reduce operating costs, and meet the current practical needs of oil and gas fields for cost reduction and efficiency improvement.

Claims

1. A combination tool string for draining and producing gas in oil and gas wells, characterized in that, This includes a drainage and gas production wellhead tool string and a drainage and gas production wellhead tool string set in sequence. The drainage and gas production well tool string includes a fixedly connected blowout relief tool (1) and wellbore (7); The drainage and gas production downhole tool string includes a rope cap (2), a weight bar (3), a bidirectional shock tool (4), an anti-upward slip device (5), and a dual suction system (6) connected in sequence by threads. The steel wire rope (119) is pulled out from the blowout relief tool (1). The steel wire rope (119) is threaded from top to bottom into the well shaft (7), rope cap (2), weight bar (3), bidirectional shock tool (4), anti-upward slip device (5) and dual suction system (6). The pressure relief tool (1) includes a riser (101), a pressure relief channel (118) machined on one side of the riser (101), a pressure relief pipe (102) welded to the riser (101) and communicating with the pressure relief channel (118), a plug (103) threadedly connected to the end of the pressure relief pipe (102) away from the riser (101), a pressure relief valve (104) threadedly connected to the middle of the pressure relief pipe (102), a buffer spring (106) also provided inside the riser (101), a lower stabilizer (105) and an upper stabilizer (107) respectively sleeved at both ends of the buffer spring (106), the riser (101) and the body (108) threadedly connected, the body (108) of the body (108) A cone seat (109) is placed inside the cone seat (109), and a cone (110) is placed inside the cone seat (109). The cone (110) is in contact with a semi-circular clamp (112). A screw (111) is provided outside the semi-circular clamp (112). A sealing core (113) is placed inside the semi-circular clamp (112). A sealing box (114) is in contact with the end face of the cone seat (109). A sealing ring (115) is placed inside the sealing box (114). A pressure cap (116) is in contact with the sealing ring (115). A pressure cap (116) is in contact with the pressure cover (117). The pressure cover (117) is threadedly connected to the body (108). The riser (101) is threadedly connected to the well shaft (7). The inner conical rope cap (2) includes a rope cap body (201), an inner cone (202) of the rope cap body (201) is installed inside the rope cap body (201), and the rope cap body (201) is threadedly connected to the weight bar (3); The bidirectional shock tool (4) includes an upper connector (401), which is connected to the weight bar (3). The upper connector (401) is inserted into the housing (402). The upper connector (401) has a spring (403) connected by a sleeve and a stop cap (404) connected by a thread. The housing (402) is threadedly connected to an intermediate connector (405). A lower connector (408) is sleeved inside the intermediate connector (405). A compression spring (407) is sleeved on the lower connector (408). A special pressure cap (406) is threadedly connected to the lower connector (408) inside the intermediate connector (405). The lower connector (408) is threadedly connected to the anti-upward slip device (5). The anti-upward slip device (5) includes a male connector (501), which is connected to the lower connector (408). The male connector (501) is threadedly connected to an intermediate short section (502). A coupling (503) is installed inside the intermediate short section (502). A slip plate (504) is sleeved on the annular groove of the intermediate short section (502). A movable conical mandrel (505) is threadedly connected to the coupling (503). A retaining ring (507) is welded on the outer diameter of the movable conical mandrel (505). A clamp (506) is welded on the retaining ring (507). The retaining ring (507) and the slip plate (504) are in contact connection. The intermediate short section (502) is in contact connection with the movable conical mandrel (505). The movable conical mandrel (505) is threadedly connected to a ball seat (509). The ball seat (509) is in contact connection with the inner hole of the sliding sleeve (508). The sliding sleeve (508) is threadedly connected to a male and female connector (511). A ball (510) is provided in the cavity formed by the sliding sleeve (508), the ball seat (509) and the male and female connector (511). The male and female connector (511) is threadedly connected to the dual suction system (6). The dual suction system (6) includes a main shaft (601), which is connected to the male and female connector (511). The main shaft (601) is fixedly connected to a fixing sleeve (603) by steel nails (602). A spring fixing seat (604) and an adjustable spring (605) are mounted on the main shaft (601). A metal spring (606) is installed in the limiting groove of the fixing sleeve (603). A transition shaft (607) is threaded onto the main shaft (601). A limiting sleeve (608) is connected to the inner hole of the transition shaft (607). A sealing seat (612) is threaded onto the limiting sleeve (608). The seat (612) is fitted with a return spring (611), which is in contact with a transition shaft (607). An expansion sealing sleeve (609) is threaded onto the outer diameter of the transition shaft (607). One end of the expansion sealing sleeve (609) is fitted with a screw plug (610) on the outer diameter of the transition shaft (607). The transition shaft (607) is threaded with a male and female ball seat (614). One end of the male and female ball seat (614) is in contact with a steel ball (613), and the other end is threaded onto a tapered connector (615). The main shaft (601) is machined with an upper bypass hole (617) and a lower bypass hole (618).

2. The oil and gas well drainage and gas production combination tool string according to claim 1, characterized in that, The cone (110) is made of aluminum alloy, the sealing core (113) is made of rubber, and the sealing ring (115) is made of polymer material.

3. The oil and gas well drainage and gas production combination tool string according to claim 1, characterized in that, Both the spring (403) and the compression spring (407) are made of stainless steel.

4. The oil and gas well drainage and gas production combination tool string according to claim 1, characterized in that, The ball seat (509) is in contact with the ball (510), the movable conical mandrel (505) can open the slip plate (504), the slip plate (504) is fitted in the annular groove of the intermediate short section (502) and limited by the clamp (506) and the retaining ring (507).

5. The oil and gas well drainage and gas production combination tool string according to claim 1, characterized in that, The steel ball (613) is in contact with the sealing seat (612).

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