A simple underwater oil and gas production wellhead

Abstract

A simple underwater oil and gas production wellhead comprises a high-pressure wellhead, an oil pipe hanger and an upper plug; the oil pipe hanger and the upper plug are arranged inside the high-pressure wellhead; the upper plug is arranged at the upper end of the oil pipe hanger; the device can be directly transferred to production as a drilling equipment; the device can be directly used for production and development, and can also be used as a sample; the device can improve installation efficiency and reduce development costs; the device can be used alone, and can also be connected with other wellheads for joint development and use.

Description

Technical Field

[0001] The invention relates to the technical field of underwater oil and gas production equipment, and in particular to a simple underwater oil and gas production wellhead. Background Art

[0002] More and more countries are conducting research and exploration on the development of hydrates, and my country has also conducted trial mining in this field. With the continuous improvement of technology, the development efforts will become stronger and stronger. The reserves of hydrates in the South China Sea in my country have been proven to be relatively high. The country has also attached more and more importance to this field. The exploration and development in this field also promotes the development and utilization of clean energy. In the context of the times, a new and simple underwater development wellhead equipment is needed to summarize the current exploration and development equipment. Summary of the invention

[0003] (I) Purpose of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes a simple underwater oil and gas production wellhead. The device can be used as a drilling equipment and can be directly put into production; the device can be directly used for production and development, and can also be used as a sample; the device can improve installation efficiency and reduce development costs; the device can be used alone, and can also be connected to other wellheads for joint development and use.

[0005] (II) Technical solution

[0006] In order to solve the above problems, the present invention provides a simple underwater oil and gas production wellhead, including a high-pressure wellhead, a tubing hanger and an upper plug; the tubing hanger and the upper plug are arranged inside the high-pressure wellhead; the upper plug is arranged at the upper end of the tubing hanger; a hanging step is arranged on the inner lower end side wall of the high-pressure wellhead; a support ring is arranged on the lower end side wall of the tubing hanger; the lower end of the support ring is arranged on the hanging step; a lower metal skeleton seal and an upper metal skeleton seal are arranged on the tubing hanger; the lower metal skeleton seal and the upper metal skeleton seal are located above the support ring, and a support skeleton is arranged between them. The frame is provided with a discharge hole on the side wall of the high-pressure wellbore head; the middle part of the support frame is a cage structure; a hole corresponding to the discharge hole is provided between the tubing hanger and the cage structure of the support frame; an annular step plane 1 is provided on the outside of the tubing hanger; the annular step plane 1 is located above the upper metal frame seal, and a support ring 1 is provided on the upper end; a locking ring 1 is provided between the outer wall of the support ring 1 and the high-pressure wellbore head; a set of locking rings is provided on the support ring 1; a pressure ring 1 is provided above the support ring 1; the lower end of the pressure ring is converged and inserted between the side wall of the tubing hanger and the support ring 1, and a retaining ring 3 is provided between the upper end and the tubing hanger ; Pipeline 1 is axially arranged inside the tubing hanger; a production tubing is arranged at the lower end of pipeline 1, and a plug thread and a plug are arranged at the upper end inside; the plug is connected to one side wall of the pipeline through the plug thread; a sealing hole 1 is arranged at the upper end of the tubing hanger; a jumper joint is arranged inside the sealing hole 1; an anti-rotation block is arranged on the outer side wall of the lower end of the upper plug; an anti-rotation groove is arranged on the upper side wall of the tubing hanger; the lower end of the anti-rotation block is arranged in the anti-rotation groove; a cross-border pipeline is arranged inside the upper plug and the tubing hanger; two groups of cross-border pipelines are connected by a jumper joint; an annular step is arranged on the side wall of the upper plug Plane 2; support ring 2 is arranged at the upper end of annular step plane 2; lock ring 2 is arranged between support ring 2 and high-pressure wellhead, and pressure ring 2 is arranged above; the lower end of pressure ring 2 is converged and inserted between the side wall of the oil pipe hanger and support ring 2, and retaining ring 2 is arranged between the upper end and the oil pipe hanger; a through hole is arranged inside the upper plug; the cross-border pipeline inside the upper plug and the oil pipe hanger corresponds to the through hole; sealing hole 2 is arranged at the upper end of the upper plug, and pipe 2 is arranged axially inside; a separator plug and separator thread are arranged at the upper end of the inner part of pipe 2; the separator plug is connected to the side wall of pipe 2 through the separator thread.

[0007] Preferably, a low-pressure wellhead is sleeved on the outer side of the lower end of the high-pressure wellhead; and the lower end of the low-pressure wellhead is connected to a fixing pile.

[0008] Preferably, a retaining ring is provided at the lower end of the oil pipe hanger; and the support ring is provided at the lower end of the oil pipe hanger through a retaining ring.

[0009] Preferably, a fixing bolt three is provided at a lower end of the support ring, and is arranged at the upper end of the annular step plane one through the fixing bolt three; a fixing bolt two is provided at the lower end of the support ring two, and is arranged at the upper end of the annular step plane two through the fixing bolt two.

[0010] Preferably, a first feeding thread is provided at the upper end of the inner side wall of pipe one; and a second feeding thread is provided at the upper end of the inner side wall of pipe two.

[0011] Preferably, a fixing bolt 1 is provided on the anti-rotation block, and is arranged on the outer side wall of the lower end of the upper plug through the fixing bolt 1.

[0012] Preferably, a robot control module is disposed inside the second sealing hole.

[0013] The above technical solution of the present invention has the following beneficial technical effects:

[0014] In the present invention,

[0015] 1. As a drilling equipment, the device can be directly put into production.

[0016] 2. The device can be directly produced and developed, or it can be used as a sample.

[0017] 3. The device can improve installation efficiency and reduce development costs.

[0018] 4. The device can be used alone or connected with other wellheads for joint development and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the simple underwater oil and gas production wellhead proposed by the present invention.

[0020] Figure numerals: 1, high-pressure wellhead; 2, tubing hanger; 3, upper plug; 4, discharge hole; 5, support ring; 6, retaining ring 1; 7, lower metal skeleton seal; 8, upper metal skeleton seal; 9, locking ring 1; 10, support ring 1; 11, pressure ring 1; 12, feeding thread 1; 13, plug; 14, plug thread; 15, anti-rotation block; 16, fixing bolt 1; 17, anti-rotation groove; 18, sealing hole 1; 19, jumper joint; 20, Locking ring two; 21. Fixing bolt two; 22. Pressing ring two; 23. Retaining ring two; 24. Retaining ring three; 25. Sealing hole two; 26. Feeding thread two; 27. Separator plug; 28. Separator thread; 29. ​​Through hole; 30. Robot control module; 101. Low-pressure wellhead; 102. Fixed pile; 201. Sitting step; 202. Production tubing; 203. Support frame; 204. Fixing bolt three; 205. Support ring two. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0022] like Figure 1 As shown, a simple underwater oil and gas production wellhead proposed by the present invention comprises a high-pressure wellhead 1, a tubing hanger 2 and an upper plug 3; the tubing hanger 2 and the upper plug 3 are arranged inside the high-pressure wellhead 1; the upper plug 3 is arranged at the upper end of the tubing hanger 2; a hanging step 201 is arranged on the inner lower end side wall of the high-pressure wellhead 1; a support ring 5 is arranged on the lower end side wall of the tubing hanger 2; the lower end of the support ring 5 is arranged on the hanging step 201; a lower metal skeleton seal 7 and an upper metal skeleton seal 8 are sleeved on the tubing hanger 2; the lower metal skeleton seal 7 and the upper metal skeleton seal 8 are located above the support ring 5, and a support skeleton 203 is arranged between them; the high-pressure wellhead 1 A discharge hole 4 is arranged on the side wall; the middle part of the support frame 203 is a cage structure; a hole corresponding to the discharge hole 4 is arranged between the tubing hanger 2 and the cage structure of the support frame 203; an annular step plane 1 is arranged on the outside of the tubing hanger 2; the annular step plane 1 is located above the upper metal frame seal 8, and a support ring 10 is arranged on the upper end; a locking ring 9 is arranged between the outer wall of the support ring 10 and the high-pressure wellhead 1; the locking ring 9 is sleeved on the support ring 10; a pressure ring 11 is arranged above the support ring 10; the lower end of the pressure ring 11 is converged and inserted between the side wall of the tubing hanger 2 and the support ring 10, and a retaining ring 24 is arranged between the upper end and the tubing hanger 2; the inside of the tubing hanger 2 A pipeline 1 is arranged along the axial direction; a production oil pipe 202 is arranged at the lower end of the pipeline 1, and a plug thread 14 and a plug 13 are arranged at the upper end inside; the plug 13 is connected to one side wall of the pipeline through the plug thread 14; a sealing hole 18 is arranged at the upper end of the oil pipe hanger 2; a jumper joint 19 is arranged inside the sealing hole 18; an anti-rotation block 15 is arranged on the outer wall of the lower end of the upper plug 3; an anti-rotation groove 17 is arranged on the upper end side wall of the oil pipe hanger 2; the lower end of the anti-rotation block 15 is arranged in the anti-rotation groove 17; a cross-border pipeline is arranged inside the upper plug 3 and the oil pipe hanger 2; two groups of cross-border pipelines are connected by a jumper joint 19; an annular step plane 2 is arranged on the side wall of the upper plug 3; an annular A support ring 205 is arranged at the upper end of the second step plane; a locking ring 20 is arranged between the second support ring 205 and the high-pressure wellhead 1, and a pressure ring 22 is arranged above it; the lower end of the pressure ring 22 is converged and inserted between the side wall of the oil pipe hanger 2 and the support ring 205, and a retaining ring 23 is arranged between the upper end and the oil pipe hanger 2; a through hole 29 is arranged inside the upper plug 3; the cross-border pipeline inside the upper plug 3 and the oil pipe hanger 2 corresponds to the through hole 29; a sealing hole 25 is arranged at the upper end of the upper plug 3, and a pipeline 2 is arranged axially inside; a separator plug 27 and a separator thread 28 are arranged at the upper end of the inside of the pipeline 2; the separator plug 27 is connected to the side wall of the pipeline 2 through the separator thread 28.

[0023] In an optional embodiment, a low-pressure wellhead head 101 is sleeved on the outer side of the lower end of the high-pressure wellhead head 1 ; and a fixing pile 102 is connected to the lower end of the low-pressure wellhead head 101 .

[0024] In an optional embodiment, a retaining ring 6 is provided at the lower end of the oil pipe hanger 2; and the support ring 5 is sleeved on the lower end of the oil pipe hanger 2 through the retaining ring 6.

[0025] In an optional embodiment, a fixing bolt three 204 is provided at the lower end of the support ring 10, and is arranged at the upper end of the annular step plane one through the fixing bolt three 204; a fixing bolt two 21 is provided at the lower end of the support ring 205, and is arranged at the upper end of the annular step plane two through the fixing bolt two 21.

[0026] In an optional embodiment, a first feeding thread 12 is provided at the upper end of the inner side wall of the first pipe; and a second feeding thread 26 is provided at the upper end of the inner side wall of the second pipe.

[0027] In an optional embodiment, a fixing bolt 16 is provided on the anti-rotation block 15 , and is arranged on the outer side wall of the lower end of the upper plug 3 through the fixing bolt 16 .

[0028] In an optional embodiment, a robot control module 30 is disposed inside the second sealing hole 25 .

[0029] In the present invention, the working principle of the device is to pre-install the wellhead equipment on the fixed pile 102, fix the low-pressure wellhead 101 on the fixed pile 102, and then install and fix the high-pressure wellhead 1 with the technical casing inside the low-pressure wellhead 101, and send it in together with the fixed pile 102. After it is in place, the drilling equipment is lowered to operate according to the design, and the operation is carried out to the predetermined position, and the oil pipe hanger 2 is lowered and installed. During the lowering process of the oil pipe hanger 2, the electric submersible pump, sensor, and chemical agent pipeline can be sent in together according to the design requirements. There are jumper joints 19 of various pipelines on the upper part of the oil pipe hanger 2, which can be connected to the control pipeline of the upper plug 3.

[0030] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A simple underwater oil and gas production wellhead, characterized in that: The invention comprises a high-pressure wellbore head (1), an oil pipe hanger (2) and an upper plug (3); the oil pipe hanger (2) and the upper plug (3) are arranged inside the high-pressure wellbore head (1); and the upper plug (3) is arranged at the upper end of the oil pipe hanger (2); A seating step (201) is provided on the inner lower end side wall of the high-pressure wellbore head (1); a support ring (5) is provided on the lower end side wall of the oil pipe hanger (2); the lower end of the support ring (5) is provided on the seating step (201); a lower metal frame seal (7) and an upper metal frame seal (8) are sleeved on the oil pipe hanger (2); the lower metal frame seal (7) and the upper metal frame seal (8) are located above the support ring (5), and a support frame (203) is provided between them; a discharge hole (4) is provided on the side wall of the high-pressure wellbore head (1); the middle part of the support frame (203) is a cage-type structure; a hole corresponding to the discharge hole (4) is provided between the oil pipe hanger (2) and the cage-type structure of the support frame (203); an annular step plane 1 is provided on the outer side of the oil pipe hanger (2); the annular step plane 1 is located above the upper metal frame seal (8), and a support ring (10) is arranged on the upper end; a locking ring (9) is arranged between the outer wall of the support ring (10) and the high-pressure wellhead (1); the locking ring (9) is sleeved on the support ring (10); a pressure ring (11) is arranged on the upper end of the support ring (10); the lower end of the pressure ring (11) is gathered and inserted between the side wall of the oil pipe hanger (2) and the support ring (10), and a retaining ring (24) is arranged between the upper end and the oil pipe hanger (2); a pipe (202) is arranged inside the oil pipe hanger (2) along the axial direction; a production oil pipe (202) is arranged at the lower end of the pipe (2), and a plug thread (14) and a plug (13) are arranged at the upper end of the inner part; the plug (13) is connected to one side wall of the pipe through the plug thread (14); a sealing hole (18) is arranged on the upper end of the oil pipe hanger (2); a jumper joint (19) is arranged inside the sealing hole (18); An anti-rotation block (15) is arranged on the outer wall of the lower end of the upper plug (3); an anti-rotation groove (17) is arranged on the upper end side wall of the oil pipe hanger (2); the lower end of the anti-rotation block (15) is arranged in the anti-rotation groove (17); a jumper pipe is arranged inside the upper plug (3) and the oil pipe hanger (2); two groups of jumper pipes are connected by a jumper joint (19); an annular step plane 2 is arranged on the side wall of the upper plug (3); a support ring 2 (205) is arranged on the upper end of the annular step plane 2; a lock ring 2 (20) is arranged between the support ring 2 (205) and the high-pressure wellhead head (1), and a pressure ring 2 (22) is arranged above. ); the lower end of the second pressure ring (22) is converged and inserted between the side wall of the oil pipe hanger (2) and the second support ring (205), and a second retaining ring (23) is arranged between the upper end and the oil pipe hanger (2); a through hole (29) is arranged inside the upper plug (3); the jumper pipe inside the upper plug (3) and the oil pipe hanger (2) corresponds to the through hole (29); the upper end of the upper plug (3) is provided with a sealing hole (25), and the second pipe is arranged axially inside; the upper end of the inside of the second pipe is provided with a separator plug (27) and a separator thread (28); the separator plug (27) is connected to the side wall of the second pipe through the separator thread (28); A retaining ring (6) is provided at the lower end of the oil pipe hanger (2); the support ring (5) is sleeved on the lower end of the oil pipe hanger (2) through the retaining ring (6); and a robot control module (30) is provided inside the sealing hole (25).

2. The simple underwater oil and gas production wellhead according to claim 1 is characterized in that: A low-pressure wellhead opening (101) is sleeved on the outer side of the lower end of the high-pressure wellhead opening (1); the lower end of the low-pressure wellhead opening (101) is connected to a fixing pile (102).

3. The simple underwater oil and gas production wellhead according to claim 1 is characterized in that: The lower end of the support ring 1 (10) is provided with a fixing bolt 3 (204), which is arranged on the upper end of the annular step plane 1 through the fixing bolt 3 (204); the lower end of the support ring 2 (205) is provided with a fixing bolt 2 (21), which is arranged on the upper end of the annular step plane 2 through the fixing bolt 2 (21).

4. The simple underwater oil and gas production wellhead according to claim 1 is characterized in that: The upper end of the inner wall of the first pipe is provided with a first feeding thread (12); the upper end of the inner wall of the second pipe is provided with a second feeding thread (26).

5. The simple underwater oil and gas production wellhead according to claim 1 is characterized in that: The anti-rotation block (15) is provided with a fixing bolt (16), which is arranged on the outer side wall of the lower end of the upper plug (3) through the fixing bolt (16).

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