A bare hole wellhead packoff

Abstract

The utility model relates to the technical field of oil well open hole well head on-site installation, maintenance, specifically relates to a kind of open hole well head well packer, including center main body, the upper end of center main body is equipped with the pressing push cylinder, and the pressing push cylinder is rotatably connected with center main body, and the outer wall of pressing push cylinder is equipped with the lifting casing pipe;Mounting bracket, it is located in the middle part of center main body, one end of mounting bracket is connected with lifting casing pipe, and rotary piece is equipped in mounting bracket, and the bottom of mounting bracket is equipped with card tooth and return elastic element;Expansion structure, it is sleeved on the lower end shoulder of center main body, and one end of expansion structure is located in card tooth, and expansion structure is fixed on center main body by stop pin;Self-sealing rubber tube, it is sleeved on the lower end of center main body, and abuts against stop pin;Lower baffle, it is connected with the bottom of center main body. By forward rotation pressing push cylinder, expansion structure expands card tooth anchoring, reverse rotation pressing push cylinder makes expansion structure and card tooth disengage, card tooth is reset to anchor by return elastic element, so that the volume of well packer is small.

Description

Technical Field

[0001] This utility model relates to the field of on-site repair and installation technology of open wellheads in oil wells, specifically to an open wellhead sealing device. Background Technology

[0002] An open-hole well refers to an oil well where the exposed portion of the casing head does not have a wellhead control device installed. Oil and gas may leak out of the wellhead. When performing maintenance or other operations at the wellhead, it is necessary to seal the open-hole wellhead or backflow the flammable oil and gas into a tanker truck through a hose to prevent a fire at the wellhead.

[0003] Conventional open-hole wellhead hot work repair operations typically involve sealing the casing with a bridge plug. This requires the use of a work platform or cable car and a pyrotechnic bridge plug for sealing. However, unsealing the bridge plug requires drilling and milling, which results in a long operation period and high costs. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the bridge plug unsealing in the prior art has to be completed through drilling and milling process, which has a long operation period and high cost, and thus provides an open hole wellhead sealing device.

[0005] To solve the above-mentioned technical problems, this utility model provides an open-hole wellhead sealing device, comprising: a central body, a clamping pusher sleeved at the upper end of the central body and rotatably connected to the central body, and an upward lifting sleeve on the outer wall of the clamping pusher sleeve; a mounting frame disposed in the middle of the central body, one end of the mounting frame connected to the upward lifting sleeve, a rotating component inside the mounting frame, and a locking tooth and a return elastic component at the bottom of the mounting frame; a tensioning structure sleeved on the lower shoulder of the central body, one end of the tensioning structure located in the locking tooth, and the tensioning structure fixed to the central body by a stop pin; a self-sealing rubber sleeve sleeved at the lower end of the central body and abutting against the stop pin; and a lower baffle connected to the bottom of the central body.

[0006] Furthermore, the inner wall of the locking tooth is tapered, and the tapered shape is adapted to the outer wall of the tensioning structure.

[0007] Furthermore, the tensioning structure is a cone.

[0008] Furthermore, the locking teeth are disposed within the circumferential square holes of the mounting bracket.

[0009] Furthermore, the return elastic element is installed inside the outer blind hole of the retaining tooth.

[0010] Furthermore, the return elastic element is a return spring.

[0011] Furthermore, the pressing pusher is threaded to the upper end of the central body, and the lower baffle is threaded to the bottom of the central body.

[0012] Furthermore, one end of the lifting sleeve is fitted onto the shoulder of the pressing push cylinder, and the other end is connected to the mounting bracket by screws.

[0013] Furthermore, the stop pin passes through the outer circular hole of the tensioning structure and is engaged in the annular groove of the central body.

[0014] Furthermore, the rotating component is a pressure bearing.

[0015] The technical solution of this utility model has the following advantages: 1. The open-hole wellhead sealing device provided by this utility model includes: a central body, a clamping pusher sleeved on the upper end of the central body and rotatably connected to the central body, and an upward lifting sleeve on the outer wall of the clamping pusher sleeve; a mounting frame disposed in the middle of the central body, one end of the mounting frame connected to the upward lifting sleeve, a rotating component disposed inside the mounting frame, and a locking tooth and a return elastic component disposed at the bottom of the mounting frame; a tensioning structure sleeved on the lower shoulder of the central body, and one end of the tensioning structure located in the locking tooth, and the tensioning structure fixed to the central body by a stop pin; a self-sealing rubber sleeve sleeved on the lower end of the central body and abutting against the stop pin; and a lower baffle plate connected to the bottom of the central body.

[0016] By fitting a clamping pusher sleeve onto the upper end of the central body, an lifting sleeve can be installed on the clamping pusher sleeve, providing an installation position for the lifting sleeve. Simultaneously, a mounting bracket is installed on the outer wall of the lifting sleeve, which connects to and secures the lifting sleeve. The locking teeth are located within the mounting bracket, allowing for positioning. During actual use, rotating the clamping pusher sleeve pushes the mounting bracket downwards, causing the mounting bracket to move the locking teeth downwards and press them against the tensioning structure. The tensioning structure then expands the locking teeth, anchoring them to the inner wall of the sleeve. When unsealing is required, a return elastic element ensures the locking teeth return to their initial position.

[0017] This open-hole wellhead sealing device uses a clamp-fixed sealing device, utilizing the sealing effect of a self-sealing rubber sleeve to seal the open-hole casing. A rotating clamping pusher anchors the clamp inside the casing. When there is a large overflow from the casing, the overflow is discharged into a tanker truck through a hose connected to the upper end of the sealing device. By rotating the clamping pusher in the forward direction, the tensioning structure expands and anchors the clamp; by rotating the clamping pusher in the reverse direction, the tensioning structure disengages from the clamp. The clamp returns to its original position and is unanchored by a return elastic element. This design makes the sealing device small in size, reusable, quick to operate, and easy to maintain, reducing maintenance costs.

[0018] This open wellhead sealing device is operated manually at the wellhead, ensuring reliable well sealing while avoiding restrictions on the use of explosives and large machinery. Two people can operate it on-site with a hook wrench. The sealing device is reusable on-site, and the drainage hose is connected to a tanker truck downwind, ensuring safety during hot work operations.

[0019] 2. The open-hole wellhead sealing device provided by this utility model has a tapered inner wall of the clamping tooth, which is adapted to the outer wall of the tensioning structure. The tensioning structure can be used to expand the clamping tooth, thereby anchoring the clamping tooth to the inner wall of the casing.

[0020] 3. The open-hole wellhead sealing device provided by this utility model has a return elastic element installed in the outer blind hole of the clamp, that is, the return elastic element is installed between the clamp and the mounting bracket, and the outer blind hole fixes the return elastic element, ensuring the installation stability of the return elastic element and preventing the return elastic element from moving arbitrarily.

[0021] The utility model summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed embodiments below. The utility model summary section is not intended to identify essential or essential features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of the open-hole wellhead sealing device provided by this utility model; Figure 2 A schematic diagram of the structure of the open-hole wellhead sealing device provided by this utility model installed inside the sleeve.

[0024] Explanation of reference numerals in the attached figures: 1. Central body; 2. Pressing push cylinder; 3. Lifting sleeve; 4. Screw; 5. Rotating component; 6. Mounting bracket; 7. Clamping teeth; 8. Return elastic component; 9. Tensioning structure; 10. Stop pin; 11. Self-sealing rubber tube; 12. Lower baffle; 13. Sleeve. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0026] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0027] Please see Figures 1 to 2 As shown, this utility model provides an open-hole wellhead sealing device, comprising: a central body 1, with a clamping pusher 2 sleeved on the upper end of the central body 1, and the clamping pusher 2 being rotatably connected to the central body 1; an upper lifting sleeve 3 being provided on the outer wall of the clamping pusher 2; a mounting frame 6, located in the middle of the central body 1, with one end of the mounting frame 6 connected to the upper lifting sleeve 3; a rotating component 5 being provided inside the mounting frame 6; and a locking tooth 7 and a return elastic component 8 being provided at the bottom of the mounting frame 6; a tensioning structure 9, sleeved on the lower shoulder of the central body 1, with one end of the tensioning structure 9 located inside the locking tooth 7; and the tensioning structure 9 being fixed to the central body 1 by a stop pin 10; a self-sealing rubber sleeve 11, sleeved on the lower end of the central body 1 and abutting against the stop pin 10; and a lower baffle 12, connected to the bottom of the central body 1.

[0028] By fitting a pressing pusher 2 onto the upper end of the central body, an lifting sleeve 3 can be installed on the pressing pusher 2, providing an installation position for the lifting sleeve 3. Simultaneously, a mounting bracket 6 is installed on the outer wall of the lifting sleeve 3, which can be connected to and fixed to the lifting sleeve 3. A locking tooth 7 is installed inside the mounting bracket 6, allowing the mounting bracket 6 to position the locking tooth 7. During actual use, rotating the pressing pusher 2 causes it to push the mounting bracket 6 downwards. The mounting bracket 6 then moves the locking tooth 7 downwards, pressing it against the tensioning structure 9. The tensioning structure 9 expands the locking tooth 7, anchoring it to the inner wall of the sleeve 13. When unsealing is required, the return elastic element 8 ensures that the locking tooth 7 returns to its initial position.

[0029] This open-hole wellhead sealing device uses a clamp 7 to fix the sealing device and utilizes the sealing effect of the self-sealing rubber sleeve 11 to seal the open-hole casing 13. A rotating clamping pusher 2 anchors the clamp 7 inside the casing 13. When the overflow from the casing 13 is large, the overflow is discharged into a tanker truck through a hose connected to the upper end of the sealing device. By rotating the clamping pusher 2 in the forward direction, the tensioning structure 9 expands and anchors the clamp 7. Reverse rotation of the clamping pusher 2 disengages the tensioning structure 9 from the clamp 7. The clamp 7 returns to its original position and is released by the return elastic element 8. This design makes the sealing device small in size, reusable, quick to operate, and easy to maintain.

[0030] This open wellhead sealing device is operated manually at the wellhead, ensuring reliable well sealing while avoiding restrictions on the use of explosives and large machinery. Two people can operate it on-site with a hook wrench. The sealing device is reusable on-site, and the drainage hose is connected to a tanker truck downwind, ensuring safety during hot work operations.

[0031] In this embodiment, the inner wall of the locking tooth 7 is tapered, and the tapered shape is adapted to the outer wall of the tensioning structure 9. The tensioning structure 9 can be used to expand the locking tooth 7, thereby anchoring the locking tooth 7 to the inner wall of the sleeve 13.

[0032] Specifically, the tensioning structure 9 is a cone.

[0033] In this embodiment, the locking tooth 7 is disposed in the circumferential square hole of the mounting bracket 6, so that the locking tooth 7 can be fixed by the circumferential square hole, thus ensuring the installation stability of the locking tooth 7.

[0034] The return elastic element 8 is installed in the outer blind hole of the clamp 7, that is, the return elastic element 8 is installed between the clamp 7 and the mounting bracket 6, and the outer blind hole fixes the return elastic element 8, ensuring the installation stability of the return elastic element 8 and preventing the return elastic element 8 from moving arbitrarily.

[0035] In this embodiment, the return elastic element 8 is a return spring.

[0036] In some optional embodiments, the pressing pusher 2 is threadedly connected to the upper end of the central body 1, and the lower baffle 12 is threadedly connected to the bottom of the central body 1.

[0037] One end of the lifting sleeve 3 is fitted onto the shoulder of the pressing push cylinder 2, and the other end is connected to the mounting bracket 6 by screws 4. That is, the screws 4 are used to achieve a stable connection between the lifting sleeve 3 and the mounting bracket 6.

[0038] Specifically, the stop pin 10 passes through the outer circular hole of the tensioning structure 9 and is engaged in the annular groove of the central body 1, thereby fixing the tensioning structure 9 to the central body 1.

[0039] In this embodiment, the rotating component 5 is a pressure bearing.

[0040] Installation method of the open-hole wellhead sealer: First, press the open hole wellhead sealing assembly into the wellhead casing 13. Then, use a hook wrench to hook onto the upper end of the central body 1 to fix it in place. Use another hook wrench to hook onto the clamping push cylinder 2, and rotate the hook wrench to make the clamping push cylinder 2 rotate clockwise. The clamping push cylinder 2 pushes the mounting frame 6 downward, and the mounting frame 6 causes the clamping teeth 7 to move down and press against the tensioning structure 9. The tensioning structure 9 expands the clamping teeth 7, so that the clamping teeth 7 are anchored on the inner wall of the casing 13. The drain hose is connected to the external thread of the central body 1, and the other end of the drain hose is connected to the tank truck, thereby achieving the functions of pressure relief and sewage discharge.

[0041] The open-hole wellhead sealer was unsealed: First, remove the drain hose. Use a hook wrench to hook onto the upper end of the central body 1 to fix the central body 1 and prevent it from rotating. Use another hook wrench to hook onto the clamping push cylinder 2. Rotate the hook wrench to make the clamping push cylinder 2 rotate in the opposite direction. After the outer shoulder of the clamping push cylinder 2 pushes upward against the inner shoulder of the lifting sleeve 3, continue to rotate the clamping push cylinder 2. The central body 1 is pushed downward to make the tensioning structure 9 disengage from the locking tooth 7. Then, under the action of the return elastic element 8, the locking tooth 7 returns inward and releases the anchorage with the sleeve 13.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A wellhead sealing device for open-hole wells, characterized in that, include: The central body (1) is fitted with a pressing push cylinder (2) at the upper end of the central body (1), and the pressing push cylinder (2) is rotatably connected to the central body (1). The outer wall of the pressing push cylinder (2) is provided with an upward lifting sleeve (3). Mounting bracket (6) is located in the middle of the central body (1). One end of the mounting bracket (6) is connected to the lifting sleeve (3). The mounting bracket (6) is equipped with a rotating part (5). The bottom of the mounting bracket (6) is equipped with a locking tooth (7) and a return elastic part (8). The tensioning structure (9) is fitted onto the lower shoulder of the central body (1), and one end of the tensioning structure (9) is located inside the retaining tooth (7). The tensioning structure (9) is fixed to the central body (1) by the stop pin (10). The self-sealing rubber tube (11) is fitted onto the lower end of the central body (1) and abuts against the stop pin (10); The lower baffle (12) is connected to the bottom of the central body (1).

2. The open-hole wellhead sealing device according to claim 1, characterized in that, The inner wall of the locking tooth (7) is tapered, and the tapered shape is adapted to the outer wall of the tensioning structure (9).

3. The open-hole wellhead sealing device according to claim 2, characterized in that, The tensioning structure (9) is a cone.

4. The open-hole wellhead sealing device according to claim 3, characterized in that, The locking tooth (7) is located in the circumferential square hole of the mounting bracket (6).

5. The open-hole wellhead sealing device according to claim 4, characterized in that, The return elastic element (8) is installed in the outer blind hole of the tooth (7).

6. The open-hole wellhead sealing device according to claim 5, characterized in that, The return elastic element (8) is a return spring.

7. The open-hole wellhead sealing device according to any one of claims 1-5, characterized in that, The pressing push cylinder (2) is threaded to the upper end of the central body (1), and the lower baffle (12) is threaded to the bottom of the central body (1).

8. The open-hole wellhead sealing device according to claim 7, characterized in that, One end of the lifting sleeve (3) is fitted onto the shoulder of the pressing push cylinder (2), and the other end is connected to the mounting bracket (6) by screws (4).

9. The open-hole wellhead sealing device according to claim 8, characterized in that, The stop pin (10) passes through the outer hole of the tensioning structure (9) and is engaged in the annular groove of the central body (1).

10. The open-hole wellhead sealing device according to claim 1, characterized in that, The rotating part (5) is a pressure bearing.

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