Built-in stop pin cement head

Abstract

The utility model discloses a built-in stop pin cement head, which belongs to the technical field of well cementation equipment and comprises a cement head shell, an upper cover cap is inserted into the upper end of the cement head shell, a sealing ring is fixedly connected to the side wall of the upper cover cap, and an ejector rod is fixedly connected to the lower end of the upper cover cap; the upper side of the outer side wall of the cement head shell is fixedly connected with three unions; the right end of the right union is connected with a conveying assembly; the inner side of the cement head shell is connected with a control mechanism; a connecting assembly is installed at the lower end of the cement head shell. The control mechanism comprises a limiting assembly and a locking assembly, and the limiting assembly used for limiting the sleeve rubber plug is connected to the side wall of the inner side of the cement head shell. The locking assembly is arranged at the right end of the outer side wall of the cement head shell and connected with the right end of the limiting assembly. By means of the mode, the locking assembly relieves limiting on the casing rubber plug through the limiting assembly, the casing rubber plug can be conveniently driven to move downwards along the feeding pipeline by replacing slurry, backflow of cement slurry is prevented, and meanwhile the sealing performance of the cement slurry in the well cementation operation process is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cementing equipment, in particular to a built-in stop pin cement head. Background Art

[0002] The field of cementing equipment technology has broad prospects. As oil and gas exploration and development expand into deep, complex formations and oceans, the demand for cementing equipment continues to increase.

[0003] Chinese patent CN217735443U discloses a cementing head, which includes a cementing head body and an endoscope connector. A cementing plug is disposed in the inner cavity of the cementing head body. An endoscope camera is disposed at one end of the endoscope connector, and a signal line interface is disposed at the other end. The endoscope camera and the signal line interface are connected via a signal line passing through the endoscope connector. The endoscope connector is fixed to the upper end of the cementing head body. The endoscope camera extends into the inner cavity of the cementing head body to capture the working status of the cementing plug. The signal line interface is exposed on the cementing head body to connect to a display device. However, this cementing head still has the following problems:

[0004] The cement head body is plugged into the plug stop pin. The limit of the cementing plug is released by pulling the plug stop pin outward. During the process of pulling the plug, it is difficult to ensure the sealing of the inside of the cement head body, and the displacement slurry may overflow from the gap between the plug and the cement head.

[0005] Based on this, the utility model designs a built-in stop pin cement head to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a cement head with a built-in stop pin.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A built-in stopper pin cement head, comprising a cement head shell;

[0009] The upper end of the cement head shell is plugged with an upper cap, the side wall of the upper cap is fixedly connected to a sealing ring, and the lower end of the upper cap is fixedly connected to a push rod for supporting the casing plug; a union is fixedly connected to the upper side of the outer wall of the cement head shell; two unions are fixedly connected to the lower side of the outer wall of the cement head shell symmetrically; the right end of the right union is connected to a conveying assembly, which conveys cement slurry through the union at the lower right end, and the conveying assembly conveys replacement slurry through the upper union; the inside of the cement head shell is connected to a control mechanism for controlling the casing plug; the lower end of the cement head shell is equipped with a connecting assembly for connecting to a feeding pipe;

[0010] The control mechanism includes a limiting assembly and a locking assembly. The limiting assembly for limiting the casing plug is connected to the inner side wall of the cement head shell; the locking assembly is arranged at the right end of the outer side wall of the cement head shell, and the locking assembly is connected to the right end of the limiting assembly. The locking assembly is used to control the realization and release of the limiting of the casing plug by the limiting assembly.

[0011] Furthermore, the conveying assembly includes a manifold, valve one and valve two. The manifold is connected to the right end of the union. The manifold is provided with two output pipes, the upper output pipe is fixedly connected to the right end of the upper union, and the lower output pipe is fixedly connected to the right end of the lower union; the side wall of the upper output pipe is fixedly connected to valve one, and the side wall of the lower output pipe is fixedly connected to valve two.

[0012] Furthermore, the limiting assembly includes an avoidance groove, a lever shaft and a stop pin. The front end of the inner wall of the cement head shell is provided with an avoidance groove; the inner wall of the avoidance groove is fixedly connected to the lever shaft; and the stop pin is rotationally connected to the lever shaft.

[0013] Furthermore, the locking assembly includes an installation groove, an opening valve core, an opening valve seat, a driving assembly, a pressure cap and a baffle. The rear end of the cement head shell is provided with an installation groove; the opening valve seat is fixedly connected to the inner wall of the installation groove; the opening valve core is rotatably connected to the opening valve seat; the front end of the opening valve core is fixedly connected to a baffle; the rear end of the opening valve seat is fixedly connected to a pressure cap for limiting the opening valve core; the rear end of the opening valve core is fixedly connected to a driving assembly for driving the opening valve core to rotate.

[0014] Furthermore, the driving component adopts a wrench or a motor.

[0015] Furthermore, the connection assembly includes a quick-connect upper joint, a quick-connect nut and a quick-connect lower joint. The lower end of the cement head shell is fixedly connected to the quick-connect upper joint; the lower end of the quick-connect upper joint is rotatably connected to the quick-connect nut; the quick-connect lower joint is threadedly connected to the quick-connect nut; and the lower end of the quick-connect lower joint is fixedly connected to the feeding pipe.

[0016] Furthermore, the union adopts a 1502 type union.

[0017] Furthermore, the distance between the top of the upper cover cap and the bottom of the quick-connect lower connector is 2036 mm.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the locking assembly releases the limit on the casing plug through the limit assembly, which is convenient for driving the casing plug downward along the feed pipe for slurry replacement, preventing the backflow of cement slurry, and the limit assembly is always on the inside of the cement head shell, while ensuring the sealing of the cement slurry during the cementing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0020] Figure 1 This is a front view of a cement head with built-in stop pins according to the present invention;

[0021] Figure 2 This is a right side view of a built-in stopper cement head of the utility model;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a top view of a cement head with a built-in retaining pin according to the present invention.

[0024] The numbers in the figure represent:

[0025] 10. Cement head shell; 11. Upper cover cap; 12. Push rod; 13. Union; 21. Manifold; 22. Valve 1; 23. Valve 2; 311. Avoidance groove; 312. Push rod shaft; 313. Stop pin; 321. Mounting groove; 322. Open valve core; 323. Open valve seat; 324. Drive assembly; 325. Press cap; 326. Baffle; 41. Quick-connect upper connector; 42. Quick-connect nut; 43. Quick-connect lower connector. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0028] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-4 , a built-in stop pin cement head, comprising a cement head shell 10;

[0029] The upper end of the cement head shell 10 is plugged with an upper cap 11, and a sealing ring is fixedly connected to the side wall of the upper cap 11. The lower end of the upper cap 11 is fixedly connected to a push rod 12 for supporting the casing plug; a union 13 is fixedly connected to the upper side of the outer wall of the cement head shell 10; two unions 13 are fixedly connected to the lower side of the outer wall of the cement head shell 10 symmetrically; the right end of the right union 13 is connected to a conveying assembly, which conveys cement slurry through the union 13 on the lower right end, and the conveying assembly conveys replacement slurry through the upper union 13; the inside of the cement head shell 10 is connected to a control mechanism for controlling the casing plug; the lower end of the cement head shell 10 is equipped with a connecting assembly for connecting to a feeding pipe; the union 13 adopts a 1502 type union;

[0030] The control mechanism includes a limiting assembly and a locking assembly. The limiting assembly for limiting the casing plug is connected to the inner side wall of the cement head shell 10; the locking assembly is arranged at the right end of the outer side wall of the cement head shell 10, and the locking assembly is connected to the right end of the limiting assembly. The locking assembly is used to control the implementation and release of the limiting assembly on the casing plug.

[0031] In the present invention, the casing plug is placed on the inner side of the cement head shell 10, and the casing plug is limited by the locking assembly to control the limiting assembly, and the upper cover cap 11 is inserted into the upper end of the cement head shell 10. The upper cover cap 11 drives the push rod 12 to move downward and support the upper end of the casing plug, and the push rod 12 cooperates with the limiting assembly to achieve the limiting fixation of the casing plug; at this time, the conveying assembly conveys cement slurry through the union 13 at the lower right end, and the cement slurry flows to the inner side of the cement head shell 10, and the cement slurry finally reaches the bottom of the well through the feeding pipe at the lower end of the connecting assembly; after the cement slurry is conveyed, the locking assembly releases the limitation of the casing plug through the limiting assembly, and at the same time, the conveying assembly conveys replacement slurry through the upper union 13, and the replacement slurry drives the casing plug to move downward along the feeding pipe to prevent the cement slurry from flowing back.

[0032] In the utility model, the locking assembly releases the limit on the casing plug through the limit assembly, which facilitates the slurry replacement and drives the casing plug to move downward along the feed pipe to prevent the backflow of cement slurry. The limit assembly is always on the inner side of the cement head shell 10, and at the same time ensures the sealing of the cement slurry during the cementing operation.

[0033] The delivery assembly includes a manifold 21, a valve 1 22, and a valve 2 23. The manifold 21 is connected to the right end of the union 13. The manifold 21 is provided with two output pipes. The upper output pipe is fixedly connected to the right end of the upper union 13, and the lower output pipe is fixedly connected to the right end of the lower right union 13. The side wall of the upper output pipe is fixedly connected to the valve 1 22, and the side wall of the lower output pipe is fixedly connected to the valve 2 23.

[0034] The limiting assembly includes an avoidance groove 311, a lever shaft 312 and a stop pin 313. The front end of the inner wall of the cement head shell 10 is provided with the avoidance groove 311; the inner wall of the avoidance groove 311 is fixedly connected to the lever shaft 312; the stop pin 313 is rotatably connected to the lever shaft 312;

[0035] The locking assembly includes a mounting groove 321, an opening valve core 322, an opening valve seat 323, a driving assembly 324, a pressure cap 325 and a baffle 326. The rear end of the cement head shell 10 is provided with a mounting groove 321; the opening valve seat 323 is fixedly connected to the inner wall of the mounting groove 321; the opening valve core 322 is rotatably connected to the opening valve seat 323; the front end of the opening valve core 322 is fixedly connected to the baffle 326; the rear end of the opening valve seat 323 is fixedly connected to the pressure cap 325 for limiting the opening valve core 322; the rear end of the opening valve core 322 is fixedly connected to the driving assembly 324 for driving the opening valve core 322 to rotate, and the driving assembly 324 can be a wrench or a motor.

[0036] The connection assembly includes a quick-connect upper joint 41, a quick-connect nut 42 and a quick-connect lower joint 43. The lower end of the cement head shell 10 is fixedly connected to the quick-connect upper joint 41; the lower end of the quick-connect upper joint 41 is rotatably connected to the quick-connect nut 42; the quick-connect lower joint 43 is threadedly connected to the quick-connect nut 42; the lower end of the quick-connect lower joint 43 is fixedly connected to the feeding pipe; the distance between the top of the upper cover cap 11 and the bottom of the quick-connect lower joint 43 is 2036 mm.

[0037] After the slurry is discharged, the slurry is discharged from the well and the feed pipe 320 is turned to the well, and the feed pipe 321 is turned to the well, so that the feed pipe 320 can be turned to the well after the slurry is discharged. On the inside of the head shell 10, the slurry replacement applies a downward force to the casing plug on the inside of the cement head shell 10, and at the same time, the driving component 324 drives the open valve core 322 to drive the baffle 326 to rotate. When the baffle 326 is misaligned with the baffle pin 313, the slurry replacement drive casing plug drives the baffle pin 313 to rotate downward around the lever shaft 312. When the baffle pin 313 rotates to the inside of the avoidance groove 311, the slurry replacement drive casing plug moves downward, thereby avoiding cement slurry backflow; when it is necessary to disassemble and assemble the feeding pipeline, rotate the quick-connect nut 42 to release the fixation of the quick-connect nut 42 to the quick-connect lower joint 43, thereby realizing disassembly and assembly of the feeding pipeline.

[0038] In the present invention, by controlling the opening and closing of valve 1 22 and valve 2 23, the cement slurry and the replacement slurry are transported separately; the valve seat 323 is driven to open by the driving component 324 to drive the baffle 326 to rotate, so that the stop pin 313 releases the limit on the casing plug, making it easier for the replacement slurry to drive the casing plug to move downward, while ensuring the sealing of the cement slurry during the cementing operation.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A built-in stopper pin cement head, comprising a cement head shell (10), characterized in that: The upper end of the cement head shell (10) is plugged with an upper cap (11), a sealing ring is fixedly connected to the side wall of the upper cap (11), and a push rod (12) for supporting the casing rubber plug is fixedly connected to the lower end of the upper cap (11); a union (13) is fixedly connected to the upper side of the outer wall of the cement head shell (10); two unions (13) are fixedly connected to the lower side of the outer wall of the cement head shell (10) in a left-right symmetrical manner; the right end of the right union (13) is connected to a conveying assembly, the conveying assembly conveys cement slurry through the union (13) at the lower right end, and the conveying assembly conveys replacement slurry through the upper union (13); the inner side of the cement head shell (10) is connected to a control mechanism for controlling the casing rubber plug; the lower end of the cement head shell (10) is installed with a connecting assembly for connecting to a feeding pipe; The control mechanism comprises a limiting assembly and a locking assembly, wherein the limiting assembly for limiting the position of the casing rubber plug is connected to the inner side wall of the cement head shell (10); the locking assembly is arranged at the right end of the outer side wall of the cement head shell (10), and the locking assembly is connected to the right end of the limiting assembly, and the locking assembly is used to control the realization and release of the limiting assembly on the casing rubber plug.

2. The built-in stopper cement head according to claim 1, characterized in that: The delivery assembly comprises a manifold (21), a valve 1 (22) and a valve 2 (23). The manifold (21) is connected to the right end of the union (13). The manifold (21) is provided with two output pipes, the upper output pipe is fixedly connected to the right end of the upper union (13), and the lower output pipe is fixedly connected to the right end of the lower union (13); the side wall of the upper output pipe is fixedly connected to the valve 1 (22), and the side wall of the lower output pipe is fixedly connected to the valve 2 (23).

3. The built-in stopper cement head according to claim 2, characterized in that: The limiting assembly comprises an avoidance groove (311), a shifting rod shaft (312) and a stop pin (313); the avoidance groove (311) is provided at the front end of the inner side wall of the cement head shell (10); the shifting rod shaft (312) is fixedly connected to the inner wall of the avoidance groove (311); and the stop pin (313) is rotatably connected to the shifting rod shaft (312).

4. The built-in stopper pin cement head according to claim 3, characterized in that: The locking assembly comprises a mounting groove (321), an opening valve core (322), an opening valve seat (323), a driving assembly (324), a pressure cap (325) and a baffle (326). The rear end of the cement head shell (10) is provided with a mounting groove (321); the opening valve seat (323) is fixedly connected to the inner wall of the mounting groove (321); the opening valve core (322) is rotatably connected to the opening valve seat (323); the front end of the opening valve core (322) is fixedly connected to the baffle (326); the rear end of the opening valve seat (323) is fixedly connected to a pressure cap (325) for limiting the opening valve core (322); and the rear end of the opening valve core (322) is fixedly connected to a driving assembly (324) for driving the opening valve core (322) to rotate.

5. The built-in stopper pin cement head according to claim 4, characterized in that: The driving component (324) adopts a wrench or a motor.

6. The built-in stopper pin cement head according to claim 5, characterized in that: The connection assembly comprises a quick-connect upper joint (41), a quick-connect nut (42) and a quick-connect lower joint (43); the lower end of the cement head shell (10) is fixedly connected to the quick-connect upper joint (41); the lower end of the quick-connect upper joint (41) is rotatably connected to the quick-connect nut (42); the quick-connect lower joint (43) is threadedly connected to the quick-connect nut (42); and the lower end of the quick-connect lower joint (43) is fixedly connected to the feeding pipe.

7. The built-in stopper cement head according to claim 6, characterized in that: The union (13) adopts a 1502 type union.

8. The built-in stopper cement head according to claim 7, characterized in that: The distance between the top of the upper cover cap (11) and the bottom of the quick-connect lower connector (43) is 2036 mm.

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