Plunger and throttling integrated gas production tool suitable for well completion under pressure

Abstract

The invention discloses a plunger and throttling integrated gas production tool suitable for under-pressure well completion, and belongs to the technical field of natural gas development equipment.The plunger and throttling integrated gas production tool suitable for under-pressure well completion comprises a working barrel, an axial extending hole is formed in the working barrel, and the working barrel is provided with a plurality of through holes; the diameter of at least partial section of the first hole part is gradually reduced along the first direction; the plug core component is assembled in the second hole part, and the plug core component is made of a soluble metal material; and a seat member. The existing ceramic rupture disk and blind plug design is replaced by the soluble design of the plug core component, the phenomenon that a plug is knocked off by liquid nitrogen gas lift pressure building is avoided, the operation time and the operation cost are greatly saved, meanwhile, the risk of generating underground falling objects is also avoided, and the falling plunger can be limited by a clamping device through the conical design of the first hole part, so that the working efficiency is improved. And the clamping device does not need to be put down through rope operation, so that the operation time and the operation cost are further saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas development equipment, and particularly relates to a plunger and throttle integrated gas production tool suitable for pressure completion Background Art

[0002] In tight gas wells and shale gas wells, production strings are usually operated under pressure. The conventional method is to connect a ceramic rupture disk at the end of the production string for internal pipe plugging. After the string is run in, liquid nitrogen gas lift is used to build pressure inside the pipe to break through the ceramic rupture disk and communicate the tubing-casing annulus to achieve normal gas well production; another method is to connect a blind plug at the end of the production string for internal pipe plugging. After the string is run in, liquid nitrogen gas lift is used to build pressure inside the pipe to knock out the blind plug and communicate the tubing-casing annulus to achieve normal gas well production. However, the ceramic rupture disk is an imported product with a long supply cycle and high price; after the blind plug is knocked out, it falls to the bottom of the well, resulting in downhole debris, which is not conducive to the development of subsequent downhole operation processes. At the same time, such gas wells usually use the plunger gas lift process for drainage gas production in the later stage. At this time, a catcher needs to be run in by wireline operation to limit the falling movement of the plunger, further increasing the operation time and cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a plunger and throttle integrated gas production tool suitable for pressure completion to solve the problems of existing gas production tools in the use process mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A plunger and throttle integrated gas production tool suitable for pressure completion, comprising:

[0005] A working cylinder body, in which there is an axially extending hole, and the hole includes a first hole portion and a second hole portion arranged in sequence along a first direction. At least part of the section of the first hole portion gradually decreases in diameter along the first direction;

[0006] A plug core member, assembled in the second hole portion, and the plug core member is made of a soluble metal material;

[0007] A seat body member, assembled in the second hole portion and fixed by a pin assembly, and the plug core member and the seat body member are arranged in sequence along the first direction. An axially extending channel is formed in the seat body member.

[0008] Preferably, the first hole portion is configured as a tapered hole.

[0009] Preferably, the second hole portion includes a first section, a second section, and a third section arranged in sequence along the first direction. The diameter of the second section is smaller than that of the third section and larger than that of the first section.

[0010] Preferably, the plug core member is assembled in the first section, the seat member is assembled in the second section, and at least one keyway is provided on the outer wall of the third section, and the inner and outer spaces of the working cylinder in the third section are communicated through the keyway.

[0011] Preferably, the channel includes a first flow path and a second flow path arranged in sequence along the second direction, and the diameter of the second flow path gradually increases along the second direction.

[0012] Preferably, the gas production tool further includes a choke body, and the choke body is assembled in the first flow path.

[0013] Preferably, the pin assembly includes a plurality of:

[0014] A pin hole, including a first part radially extending from the outer wall of the working cylinder to the inner wall and a second part radially extending inward from the outer wall of the seat member;

[0015] A pin member, including a head and a cylindrical portion, and the cylindrical portion has a connection section connected to the first part and an insertion section adapted to the first part.

[0016] Preferably, the outer wall of the connection section and a part of the inner wall of the first part are provided with adapted external threads and internal threads.

[0017] Preferably, the cylindrical portion further includes a sealing section, on which an annular groove for installing a second sealing ring is formed.

[0018] Preferably, at least one annular groove for accommodating a first sealing ring is provided on the outer wall of the plug core member, and the first sealing ring is made of a soluble rubber material.

[0019] Preferably, annular grooves for accommodating third sealing rings are provided on both sides of the pin assembly on the outer wall of the seat member.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In this application, a gas production tool composed of a working cylinder, a plug core member and a seat member is provided. The second hole part in the working cylinder is used as the installation hole for the plug core member and the seat member. The soluble design of the plug core member is used to replace the existing ceramic rupture disk and blind plug design, avoiding the use of liquid nitrogen gas lift to hold pressure and knock off the plug, greatly saving the operation time and operation cost. At the same time, the risk of downhole falling objects is also avoided. Through the conical design of the first hole part, the falling plunger can be limited instead of using a catcher, and there is no need to lower the catcher by wireline operation, further saving the operation time and operation cost. Description of the Drawings

[0022] Figure 1 Schematic diagram of the overall structure of the gas production tool;

[0023] Figure 2 is a schematic structural diagram of the working cylinder body;

[0024] Figure 3 is a schematic structural diagram of the pin component.

[0025] In the figure:

[0026] 100, working cylinder body; 100a, first end; 100b, second end;

[0027] 200, first hole part; 201, second hole part; 201a, first section; 201b, second section; 201c, third section; 202, keyway;

[0028] 300, plug core component; 301, first sealing ring;

[0029] 400, seat body component; 401, channel; 401a, first flow path; 401b, second flow path; 402, throttle nozzle body; 403, third sealing ring;

[0030] 500, pin component; 501, head; 502, cylindrical part; 502a, sealing section; 502b, connecting section; 502c, inserting section; 503, second sealing ring; 504, pin hole; 504a, first part; 504b, second part;

[0031] 600, guide head component; 601, mounting groove body. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] A plunger and throttle integrated gas production tool suitable for pressure-keeping well completion (hereinafter referred to as the gas production tool), referring to Figure 1 - Figure 2The main body of the gas production tool is composed of a working cylinder 100, a plug core member 300 and a seat member 400. The working cylinder 100 adopts a tubing nipple structure, with an outer diameter and material the same as those of the tubing coupling. Both ends of the working cylinder 100 are machined into tubing threads. Specifically, the working cylinder 100 extends along the axis O and has an axial first end 100a and a second end 100b. In subsequent descriptions, the extension direction from the first end 100a to the second end 100b is denoted as the first direction, and the opposite direction of the first direction (i.e., the extension direction from the second end 100b to the first end 100a) is denoted as the second direction. A guide head member 600 is assembled at the second end 100b of the working cylinder 100, and the two are detachably connected. Exemplarily, the working cylinder 100 and the guide head are threadedly connected. Specifically, one end of the guide head member 600 is provided with an installation groove 601 for the working cylinder 100 to insert. External threads and internal threads are provided on the outer wall of the second end 100b of the working cylinder 100 and on the installation groove 601. At this time, the working cylinder 100 can be connected to the guide head member 600 by screwing in. Back to Figure 1 and 2 , continue to describe the composition of the gas production tool. An axially extending through hole is provided in the working cylinder 100. In some embodiments, the through hole includes a first hole portion 200 and a second hole portion 201. The first hole portion 200 is configured as a limiting hole for gas production work, and the second hole portion 201 is configured as an installation hole for the gas production tool components, that is, the installation holes for the plug core member 300 and the seat member 400. Specifically, the plug core member 300 is fixed in the second hole portion 201.

[0034] In some embodiments, referring to Figure 2 , the second hole portion 201 is configured as a stepped hole group. Specifically, the second hole group includes a first section 201a, a second section 201b and a third section 201c arranged in sequence along the first direction. The diameter of the second section 201b is greater than that of the first section 201a and less than that of the third section 201c. Correspondingly, the plug core member 300 is assembled in the first section 201a, the seat member 400 is assembled in the second section 201b, and the seat member 400 is fixed by a pin assembly. The pin assembly can be cut off under an external force to disconnect the connection between the seat member 400 and the working cylinder 100. Correspondingly, the seat member 400 descends into the third section 201c. Back to Figure 2, Continuing with the description of the second hole portion 201, at least one keyway 202 is provided on the above-mentioned third section 201c. The keyway 202 is configured as a connection groove between the external section and the internal section of the working cylinder 100 in the third section 201c. That is, the external section and the internal section of the working cylinder 100 in the third section 201c are connected through the keyway 202, so that high-pressure natural gas can enter the internal section of the working cylinder 100 from the external section of the working cylinder 100.

[0035] Referring to Figure 1 , the above-mentioned plug core member 300 is generally configured as a cylindrical component assembled in the first section 201a. The outer wall of the plug core member 300 fits with the inner wall of the first section 201a. The plug core member 300 is made of a soluble metal material. That is, the plug core member 300 is configured to be able to dissolve into powder under the action of well fluid, and the dissolution time of the plug core member 300 can be adjusted by the composition of the plug core member 300. And the staff can inject liquids such as clear water during the operation period of the working cylinder 100, in cooperation with the adjustment of the components of the plug core member 300, to achieve the dissolution control of the plug core member 300. At the same time, at least one annular groove for accommodating the first sealing ring 301 is provided on the outer wall of the plug core member 300. The sealing between the contact surface of the plug core member 300 and the first section 201a is achieved through the first sealing ring 301. Exemplarily, three annular grooves are provided on the outer wall of the plug core member 300 at intervals in the axial direction. Further, the above-mentioned first sealing ring 301 is configured as a soluble sealing ring, so that the first sealing ring 301 can dissolve synchronously with the plug core member 300. Exemplarily, the above-mentioned first sealing ring 301 is made of a soluble rubber material.

[0036] Referring to Figure 1 and 2 , an axially extending channel 401 is provided in the above-mentioned seat member 400. The channel 401 includes a first flow path 401a and a second flow path 401b arranged in sequence along the second direction. The second flow path 401b is configured as a gradually expanding flow path, that is, the diameter of the second flow path 401b gradually increases along the second direction. Exemplarily, the second flow path 401b is configured as a conical flow path. In some embodiments, a throttle nozzle body 402 is assembled in the first flow path 401a of the above-mentioned seat member 400. When the gas production tool operates, high-pressure natural gas enters the working cylinder 100 through the keyway 202 of the third section 201c, flows through the throttle nozzle body 402 and then flows out of the seat member 400 along the second flow path 401b.

[0037] Referring to Figure 1 and 2, continue to describe the gas production tool. A set of pin holes 504 are provided on the outer wall of the above-mentioned seat member 400 and the second section 201b. The set of pin holes 504 is composed of a plurality of circumferentially distributed pin holes 504. Each single pin hole 504 includes a first part 504a extending from the outer wall to the inner wall of the second section 201b and a second part 504b extending radially from the outer wall of the seat member 400. Correspondingly, the above-mentioned pin assembly includes a plurality of pin members 500. The number of pin members 500 is the same as the number of pin holes 504, and each single pin member 500 can enter the pin hole 504 to realize the connection between the seat member 400 and the working cylinder 100. In some embodiments, referring to Figure 3 , the above-mentioned pin member 500 includes a head 501 and a cylindrical part 502. Specifically, the cylindrical part 502 includes a sealing section 502a, a connecting section 502b, and an insertion section 502c. The insertion section 502c constitutes the assembly part of the pin member 500 and the second part 504b of the pin hole 504. That is, after the pin member 500 is installed, the insertion section 502c is located in the second part 504b of the pin hole 504. Back to Figure 3 , continue to describe the pin member 500. The above-mentioned connecting section 502b constitutes the fixed section of the pin member 500. Exemplarily, an external thread is provided on the outer wall of the connecting section 502b. Correspondingly, an internal thread adapted to the external thread of the connecting section 502b is provided on a partial section of the first part 504a of the pin hole 504. The installation of the pin member 500 is realized through the connection of the internal and external threads. Back to Figure 3 , the above-mentioned sealing section 502a constitutes the installation section of the second sealing ring 503. The second sealing ring 503 is used to realize the sealing between the contact surfaces of the pin member 500 and the pin hole 504.

[0038] In some embodiments, the above-mentioned seat member 400 is provided with annular grooves for accommodating the third sealing ring 403 on both sides of the pin assembly. The third sealing ring 403 is used to realize the sealing between the contact surfaces of the seat member 400 and the working cylinder 100.

[0039] In some embodiments, referring to Figure 1 , the diameter of the above-mentioned first hole part 200 gradually decreases along the first direction. Exemplarily, the first hole part 200 is configured as a conical hole. By designing the first hole part 200 to be conical, in the later stage of gas well exploitation, the inner conical surface of the working cylinder 100 can replace the catcher to limit the falling plunger, and there is no need to lower the catcher through wireline operation.

[0040] The working process of the above-mentioned gas production tool is as follows:

[0041] The ground installs the plug core member 300 and the seat body member 400 in the first section 201a and the second section 201b inside the working cylinder 100 respectively. After the first end 100a of the working cylinder 100 is connected to the end of the oil pipe, it is lowered to the set position through a pressure operation. After the plug core member 300 contacts the well fluid and dissolves, after the dissolution of the plug core member 300 is completed, the high-pressure natural gas in the well flows into the working cylinder 100 from the keyway 202 on the third section 201c, flows through the throttle nozzle body 402 and the second flow path 401b, and then enters the oil pipe; when it is necessary to cancel the throttling process or the throttling fails due to other reasons, a soluble ball is put into the wellhead and the oil pipe is pressurized to cut off the pin member 500. The seat body member 400 moves downward along the first direction to expose the keyway 202 on the working cylinder 100, and the natural gas in the well enters the oil pipe for production through the keyway 202; when carrying out the plunger process, the tapered first hole portion 200 inside the working cylinder 100 can replace the catcher to limit the falling plunger, and there is no need to lower the catcher by wireline operation.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plunger and throttle integrated gas production tool applicable to pressure-holding completion, characterized in that: Comprising: A working cylinder body, in which an axially extending hole is formed. The hole includes a first hole portion and a second hole portion arranged in sequence along a first direction. At least a partial section of the first hole portion has a diameter gradually decreasing along the first direction. A plug core member, assembled in the second hole portion, and the plug core member is made of a soluble metal material. A seat body member, assembled in the second hole portion and fixed by a pin assembly. The plug core member and the seat body member are arranged in sequence along the first direction. An axially extending channel is formed in the seat body member.

2. The integrated gas production tool with a plunger and a throttle valve applicable to pressure-keeping well completion according to claim 1, characterized in that: The first hole portion is configured as a tapered hole.

3. The integrated gas production tool of a plunger and a throttle valve applicable to pressure completion according to claim 1 or 2, characterized in that: The second hole portion includes a first section, a second section, and a third section arranged in sequence along the first direction. The diameter of the second section is smaller than that of the third section and larger than that of the first section.

4. The integrated gas production tool of a plunger and a throttle valve applicable to pressure completion according to claim 3, characterized in that: The plug core member is assembled in the first section, the seat body member is assembled in the second section, and at least one key groove is formed on the outer wall of the third section. The inner and outer spaces of the working cylinder body in the third section are communicated through the key groove.

5. The integrated gas production tool of a plunger and a throttle valve applicable to pressure-keeping well completion according to claim 1, characterized in that: The channel includes a first flow path and a second flow path arranged in sequence along a second direction. The diameter of the second flow path gradually increases along the second direction.

6. The integrated gas production tool of a plunger and a throttle valve applicable to underbalanced completion according to claim 5, wherein: The gas production tool further includes a choke nozzle body, which is assembled in the first flow path.

7. The integrated gas production tool with a plunger and a throttle for pressure completion according to claim 1, characterized in that: The pin assembly includes a plurality of: Pin holes, including a first part radially extending from the outer wall of the working cylinder body to the inner wall and a second part radially extending inward from the outer wall of the seat body member. Pin members, including a head and a columnar portion. The columnar portion has a connection section connected to the first part and an insertion section adapted to the first part.

8. The integrated gas production tool for plunger and throttle applicable to pressure completion according to claim 7, characterized in that: External threads and internal threads adapted to each other are provided on the outer wall of the connection section and a partial inner wall of the first part.

9. The integrated gas production tool for plunger and throttle applicable to pressure completion according to claim 8, characterized in that: The columnar portion further includes a sealing section, on which an annular groove for installing a second sealing ring is formed.

10. A plunger and throttle integrated gas production tool applicable to pressure-holding well completion, characterized in that: At least one annular groove for accommodating a first sealing ring is formed on the outer wall of the plug core member. The first sealing ring is made of a soluble rubber material.

11. The integrated gas production tool for plunger and throttle applicable to underbalanced completion according to claim 1, wherein: Annular grooves for accommodating third sealing rings are provided on both sides of the pin assembly on the outer wall of the seat body member.

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