Horizontal well mouth pipe hanger telescopic device

Abstract

The utility model provides a horizontal well mouth pipe hanger telescopic device which comprises an upper gland, a lower gland, an outer cylinder, an inner cylinder and a piston, an upper hollow portion is formed on the upper gland, a lower hollow portion is formed on the lower gland, the upper gland is connected with the upper end of the outer cylinder, the upper hollow portion is connected with an oil pipe nipple, and the inner cylinder is connected with the piston. The upper pressing cover is connected with the lower end of the outer cylinder, the lower pressing cover is connected with the lower end of the outer cylinder, the piston is movably arranged in the outer cylinder and located between the upper pressing cover and the lower pressing cover, one end of the inner cylinder penetrates through the lower hollow part to be connected with the piston, and the other end of the inner cylinder is connected with a tubular column in a horizontal well. Sealing pieces are arranged between the upper gland and the outer cylinder, between the lower gland and the outer cylinder, between the lower gland and the inner cylinder and between the piston and the outer cylinder. The upper flange plate and the lower flange plate of the horizontal well can be quickly closed.

Description

Technical Field

[0001] The utility model relates to operations on a horizontal well, in particular to a wellhead pipe hanging telescopic device for a horizontal well. Background Art

[0002] Due to the technical requirements, horizontal wells need to be handed over to the oil production process after the drilling process is completed. During the oil production process, the pressure of the horizontal production section is greater than the wellbore pressure. In order to prevent well kicks and blowouts, a long-term packer is set below the oil well deflection point and above the horizontal production section to block the horizontal production section and the wellbore for sealing and production processes. When the center cannula of the packer carried by the lower part of the production string is inserted into the packer, the passage between the horizontal production section and the wellbore is opened. At this time, the pressure of the liquid gushing out of the horizontal production section is about 20 MPa, which will overflow to the wellhead within 3 minutes. During this period of time, the upper and lower flanges of the wellhead must be quickly closed to achieve the purpose of sealing. If the upper and lower flanges are greater than 10 to 35 cm due to the telescopic properties of the well string, calculation errors, etc., the upper and lower flanges must be tightened with wellhead screws to close them. If the upper and lower flanges of the wellhead cannot be closed within 3 minutes, well kicks and blowouts will occur, causing oil and gas pollution on the working surface, increasing the risk of fire and toxic and harmful gas damage. Utility Model Content

[0003] In view of the above technical problems, the technical solution adopted by the utility model is:

[0004] An embodiment of the utility model provides a horizontal wellhead pipe hanging and telescopic device, comprising: an upper pressure cover, a lower pressure cover, an outer cylinder, an inner cylinder, and a piston, wherein the upper pressure cover is formed with an upper hollow portion, and the lower pressure cover is formed with a lower hollow portion, the upper pressure cover is connected to the upper end of the outer cylinder, the upper hollow portion is connected to a short section of the oil pipe, and the lower pressure cover is connected to the lower end of the outer cylinder, the piston is movably arranged inside the outer cylinder and is located between the upper pressure cover and the lower pressure cover, one end of the inner cylinder passes through the lower hollow portion and is connected to the piston, and the other end of the inner cylinder is connected to the pipe column in the horizontal well, and sealing members are arranged between the upper pressure cover and the outer cylinder, between the lower pressure cover and the outer cylinder, between the lower pressure cover and the inner cylinder, and between the piston and the outer cylinder.

[0005] The utility model has at least the following beneficial effects:

[0006] The horizontal wellhead pipe hanging and telescopic device provided by the embodiment of the utility model has an inner tube that can be telescoped and has an effective stroke of 38 cm. In specific applications, if the oil pipe is too long, the uppermost oil pipe can be removed and the horizontal wellhead pipe hanging and telescopic device can be used to replace a part of the oil pipe. If the oil pipe is too short, the horizontal wellhead pipe hanging and telescopic device can also be used to replace a part of the oil pipe, thereby preventing the upper and lower flanges of the wellhead from failing to close in time, causing well kicks and blowouts, thereby preventing well kicks and blowouts, and preventing the occurrence of hazards such as wellhead oil pollution, fire hazards, and toxic and harmful gas invasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 A working state diagram of a horizontal wellhead pipe hanging and telescopic device provided in an embodiment of the utility model;

[0009] Figure 2 A schematic diagram of an outer cylinder of a horizontal wellhead pipe hanging and telescopic device provided in an embodiment of the utility model;

[0010] Figure 3 A schematic diagram of the inner cylinder of the horizontal wellhead pipe hanging and telescopic device provided in an embodiment of the utility model;

[0011] Figure 4 A schematic diagram of a piston of a horizontal wellhead pipe hanger telescopic device provided in an embodiment of the utility model;

[0012] Figure 5 A schematic diagram of an upper gland of a horizontal wellhead pipe hanging and telescopic device provided by an embodiment of the utility model;

[0013] Figure 6 A schematic diagram of a lower gland of a horizontal wellhead pipe hanging and telescopic device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0015] The utility model embodiment provides a horizontal wellhead pipe hanging telescopic device, the application scenario is the oil production process scenario. Figures 1 to 6 As shown, the device may include: an upper gland 4, a lower gland 5, an outer cylinder 1, an inner cylinder 2, and a piston 3. The upper gland 4 is formed with an upper hollow portion, and the lower gland 5 is formed with a lower hollow portion. The upper gland 4 is connected to the upper end of the outer cylinder 1, and the upper hollow portion is connected to the oil pipe nipple 7. The lower gland 5 is connected to the lower end of the outer cylinder 1. The piston 3 is movably arranged inside the outer cylinder 1 and is located between the upper gland 4 and the lower gland 5. One end of the inner cylinder 2 passes through the lower hollow portion and is connected to the piston 3. The other end of the inner cylinder 2 is connected to the tubing string 8 in the horizontal well. Seals are provided between the upper gland 4 and the outer cylinder 1, between the lower gland 5 and the outer cylinder 1, between the lower gland 5 and the inner cylinder 2, and between the piston 3 and the outer cylinder 1.

[0016] In the embodiment of the utility model, the tubing nipple 7 is connected to the upper flange 6 of the horizontal well (not shown), and the tubing string 8 passes through the lower flange 9 of the horizontal well and is connected to the packer 11 buried in the wellbore 12. The lower flange 9 is set on the ground 10.

[0017] Furthermore, in the embodiment of the utility model, the upper pressure cover 4 and the outer cylinder 1 are connected by threads, the lower pressure cover 5 and the outer cylinder 1 are connected by threads; and the inner cylinder 2 and the piston 3 are connected by threads.

[0018] Furthermore, if Figure 2 As shown, the outer tube 1 is provided with a first threaded portion and a second threaded portion at both ends, and each threaded portion is formed with an internal thread.

[0019] Furthermore, if Figure 3 As shown, the inner tube 2 may include a first threaded portion 201, a telescopic portion 202, an operating portion 203, and a second threaded portion 204 connected in sequence, the first threaded portion 201 is connected to the piston 3, the second threaded portion 204 is connected to the pipe column 8, the length of the operating portion 203 is less than the length of the telescopic portion 204, and the surface roughness of the operating portion 203 is greater than the surface roughness of the telescopic portion, that is, the operating portion is an unpolished area. The operating portion is not polished, which can prevent the sealing performance from being reduced when the polished area is screwed with a tightening tool.

[0020] Furthermore, if Figure 4 As shown, the piston 3 may include a hollow portion 302 on which an internal thread matching the first threaded portion 201 of the inner tube 2 is formed, and two circular grooves extending in the circumferential direction are arranged on the outer surface of the piston 3, and a seal 301 is arranged in the circular groove.

[0021] Furthermore, if Figure 5 As shown, the upper gland 4 may include a first upper base 401, a second upper base 407, and an upper insert 403 disposed between the first upper base 401 and the second upper base 407, wherein the diameter of the second upper base 407 is smaller than the diameter of the first upper base 401. Two circular grooves extending in the circumferential direction are disposed on the outer side of the second upper base, and a sealing member 408 is disposed in the circular groove.

[0022] The diameter of the first connection end of the upper inserting part 403 connected to the first upper base 401 is larger than the diameter of the second connection end of the upper inserting part connected to the second upper base 407, that is, the upper inserting part 403 is a tapered body that is wide at the top and narrow at the bottom. The upper inserting part 403 is formed with an external thread 405 that matches the internal thread on the first threaded part of the outer tube.

[0023] The hollow portion of the upper gland 4 includes a conical portion 406 extending from the top of the first upper base 401 to the upper insertion portion 403 and a cylindrical portion 404 extending from the lower end of the conical portion 406 to the second upper base 407. The conical portion is provided with an internal thread for threaded connection with the tubing nipple 7. The diameter of the upper end of the conical portion 406 is greater than the diameter of the lower end of the conical portion 406.

[0024] Furthermore, if Figure 6 As shown, the lower gland 5 may include a first lower base 501, a second lower base 504, and a lower inserting portion 502 disposed between the first lower base 501 and the second lower base 504, wherein the diameter of the second lower base 504 is greater than the diameter of the first lower base 501. The outer side of the second lower base 504 has two circular grooves extending in the circumferential direction, and a sealing member 506 is disposed in the circular groove.

[0025] Further, the diameter of the first connection end of the lower insert 502 connected to the first lower base 501 is larger than the diameter of the second connection end of the lower insert 502 connected to the second lower base, i.e., a tapered body that is wide at the top and narrow at the bottom, and an external thread 503 that matches the internal thread of the second threaded portion of the outer cylinder is formed under the lower insert. The hollow portion 505 of the lower gland is a cylindrical hole, and three sealing members are arranged on the hollow portion of the lower gland.

[0026] In the embodiment of the utility model, the sealing member may be a sealing ring capable of withstanding a pressure of 35 MPa.

[0027] In the embodiment of the utility model, the length of the outer cylinder can be 60 cm, the inner diameter can be 10 cm, the outer diameter can be 11.4 cm, and the effective stroke of the inner cylinder can be 38 cm.

[0028] The horizontal wellhead pipe hanging and telescopic device provided by the embodiment of the utility model, when in use, first connect one end of the inner tube with the piston, then insert the piston into the outer tube, then insert the lower gland through the inner tube into the outer tube and connect it with the second threaded portion of the outer tube, insert the upper gland into the other end of the outer tube and connect it with the first threaded portion of the outer tube, then connect the oil pipe nipple with the upper gland, connect the second threaded portion of the inner tube with the pipe column, during the connection process, use a pipe clamp to clamp the operating part, and screw the inner tube so that the inner tube and the pipe column are tightly connected. Then, put the device as a whole into the well so that the upper flange and the lower flange can be quickly fitted together, and the flanges are embedded with steel rings for sealing, and then the upper flange and the lower flange are connected by bolts.

[0029] The horizontal wellhead pipe hanging and telescopic device provided by the embodiment of the utility model has an inner tube that can be telescoped and has an effective stroke of 38 cm. In specific applications, if the oil pipe lowered into the well is too long, the uppermost oil pipe can be removed and the horizontal wellhead pipe hanging and telescopic device can be used to replace a portion of the oil pipe. If the oil pipe is too short, the horizontal wellhead pipe hanging and telescopic device can also be used to replace a portion of the oil pipe. This can avoid well kicks and blowouts caused by the spacing being greater than 10 to 35 cm due to the telescopic properties of the tubing in the well, calculation errors, and other reasons, and the upper and lower flanges of the wellhead cannot be closed in time, thereby avoiding the occurrence of well kicks and blowouts, and can prevent the occurrence of hazards such as wellhead oil pollution, fire accidents, and toxic and harmful gas invasions.

[0030] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should also be understood by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A horizontal wellhead pipe hanging and telescopic device, characterized in that: include: An upper gland, a lower gland, an outer tube, an inner tube, and a piston, wherein the upper gland is formed with an upper hollow portion, and the lower gland is formed with a lower hollow portion, the upper gland is connected to the upper end of the outer tube, the upper hollow portion is connected to a short section of the oil pipe, and the lower gland is connected to the lower end of the outer tube, the piston is movably arranged inside the outer tube and located between the upper gland and the lower gland, one end of the inner tube passes through the lower hollow portion and is connected to the piston, and the other end of the inner tube is connected to a tubing string in a horizontal well, and seals are arranged between the upper gland and the outer tube, between the lower gland and the outer tube, between the lower gland and the inner tube, and between the piston and the outer tube.

2. The horizontal wellhead pipe hanging and telescopic device according to claim 1, characterized in that: The upper gland and the outer cylinder are connected by threads, the lower gland and the outer cylinder are connected by threads, and the inner cylinder and the piston are connected by threads.

3. The horizontal wellhead pipe hanging and telescopic device according to claim 1, characterized in that: The inner tube includes a first threaded portion, a telescopic portion, an operating portion, and a second threaded portion that are connected in sequence, the first threaded portion is connected to the piston, the second threaded portion is connected to the pipe column, the length of the operating portion is smaller than the length of the telescopic portion, and the surface roughness of the operating portion is greater than the surface roughness of the telescopic portion.

4. The horizontal wellhead pipe hanging and telescopic device according to claim 1, characterized in that: The upper pressure cover includes a first upper base, a second upper base and an upper insertion portion arranged between the first upper base and the second upper base, the diameter of the second upper base is smaller than the diameter of the first upper base, the diameter of the first connecting end of the upper insertion portion connected to the first upper base is larger than the diameter of the second connecting end of the upper insertion portion connected to the second upper base, an external thread is formed on the upper insertion portion, and the hollow portion of the upper pressure cover includes a conical portion extending from the top of the first upper base to the upper insertion portion and a cylindrical portion extending from the lower end of the conical portion to the second upper base, an internal thread is arranged in the conical portion, and the diameter of the upper end of the conical portion is larger than the diameter of the lower end of the conical portion.

5. The horizontal wellhead pipe hanging and telescopic device according to claim 4, characterized in that: Two sealing members are arranged on the outer side of the second upper substrate.

6. The horizontal wellhead pipe hanging and telescopic device according to claim 1, characterized in that: The lower pressure cover includes a first lower base, a second lower base, and a lower insertion portion arranged between the first lower base and the second lower base, the diameter of the second lower base is larger than the diameter of the first lower base, the diameter of the first connecting end of the lower insertion portion connected to the first lower base is larger than the diameter of the second connecting end of the lower insertion portion connected to the second lower base, an external thread is formed under the lower insertion portion, and the hollow portion of the lower pressure cover is a cylindrical hole.

7. The horizontal wellhead pipe hanging and telescopic device according to claim 6, characterized in that: Two sealing members are arranged on the outer side of the second lower substrate.

8. The horizontal wellhead pipe hanging and retracting device according to claim 6, characterized in that: Three sealing members are arranged on the hollow portion of the lower gland.

9. The horizontal wellhead pipe hanging and telescopic device according to claim 1, characterized in that: The effective stroke of the inner cylinder is 38 cm.

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