Jackscrew anti-falling assembly for oil production wellhead

Abstract

The utility model relates to the technical field of jackscrews, in particular to a jackscrew anti-falling component for an oil production wellhead, which comprises an anti-falling component body, a hanger arranged at the top of the anti-falling component body, an oil pipe head slidably sleeved at the bottom of the hanger, stepped holes arranged on two sides of the oil pipe head, jackscrews sleeved in the stepped holes, and an anti-falling component body arranged on the top of the anti-falling component body. One end of the jackscrew is sleeved with a locking nut in a threaded mode, a pressing plate is arranged on one side of the locking nut, and a pressing cover is fixedly connected to one side of the pressing plate. The hanger has the advantages that the jackscrew is screwed in from the inner hole of the tubing head, so that the large end of the jackscrew is clamped in the stepped hole, one end of the jackscrew is limited and fixed through the locking nut, the large end of the jackscrew abuts against the annular outer ring face of the jackscrew, and then the hanger is limited in the tubing head through the jackscrew; therefore, even if threads on the jackscrew lose efficacy due to corrosion, the jackscrew cannot be ejected out to cause accidents, and the pressing plate moves to drive the pressing cover to press one end of the jackscrew, so that the jackscrew is prevented from being ejected out by internal pressure to cause leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of top screws, in particular to a top screw anti-falling component used for an oil wellhead. Background Art

[0002] In the design of oil wellhead equipment, preventing the top screw from falling off is an important safety issue. The falling top screw may cause the seal of the tubing hanger to fail, increase production costs and labor intensity of workers.

[0003] In the prior art, a top screw is screwed into the wellhead tubing head from the outside of the flange to hold the hanger inside. However, under special working conditions, the threads on some top screws fail due to corrosion, causing leakage, or even being pushed out by the internal pressure, causing leakage accidents. Utility Model Content

[0004] The utility model aims to provide a top screw anti-falling component for an oil wellhead, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a top screw anti-falling component for an oil wellhead, comprising: an anti-falling component body, a hanger is arranged on the top of the anti-falling component body, a tubing head is slidably sleeved on the bottom of the hanger, stepped holes are provided on both sides of the tubing head, a top screw is sleeved in the stepped hole, and a locking nut is threadedly sleeved on one end of the top screw.

[0006] A pressure plate is arranged on one side of the locking nut, and a pressure cover is fixedly connected to one side of the pressure plate.

[0007] Preferably, a set of two top screws are provided and are symmetrically arranged about the central plane of the tubing head. A packing ring is fixedly sleeved at one end of the top screw, and a packing pressure cap is sleeved at the other end of the top screw, and one side of the packing pressure cap abuts against the locking nut.

[0008] Preferably, both sides of the pressure plate are slidably connected to the fixed plate, one end of the fixed plate is fixedly connected to the outer ring surface of the oil pipe head, and the other end of the fixed plate is rotatably sleeved with a threaded rod.

[0009] Preferably, the threaded rod is provided with two sections of threads with opposite rotation directions, the threaded rod is sleeved with a threaded sleeve, and a small shaft is fixedly connected to one side of the threaded sleeve.

[0010] Preferably, a connecting seat is fixedly connected to one side of the pressure plate, the connecting seat is rotatably connected to one end of the connecting rod through a small shaft, and the other end of the connecting rod is rotatably connected to the screw sleeve through the small shaft.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: The set screw is inserted into the stepped hole opened on the side wall of the tubing head through the inner hole of the tubing head. The length of the set screw is adapted to the inner diameter of the tubing head, which facilitates its insertion. Thus, the large head of the set screw is clamped in the stepped hole. Since there are steps in the stepped hole, the large head of the set screw is clamped. The stepped holes are opened on both sides of the tubing head, which facilitates the set screw to limit the hanger from both ends. A packing ring is fixedly sleeved at one end of the set screw, which increases the friction and improves the sealing performance at the same time. A packing gland is sleeved at the other end of the set screw, which further increases the sealing performance. The lock nut presses the packing gland tightly, thereby limiting and fixing the set screw and reducing the possibility of it being pushed out from the inside due to the corrosion and failure of the thread. By rotating the crank handle fixedly connected to one end of the threaded rod, the crank handle drives the threaded rod to rotate in the fixed plate, so that the threaded rod drives the nut sleeve on it to move. When the two nut sleeves move towards each other, one end of the connecting rod is driven by the connection of the small shaft, so that the other end of the connecting rod drives the connecting seat to move towards the set screw through the rotational connection of the small shaft with the connecting seat, so that the connecting seat drives the pressure plate to move towards the set screw. One side of the pressure plate is fixedly connected to the gland, so that the gland approaches the set screw, and the gland presses one end of the set screw, thus avoiding the problems of leakage and even being pushed out from the inside due to the corrosion and failure of the thread on the set screw, improving the safety and reliability. At the same time, even if the thread of the set screw is corroded and fails, it is impossible to be pushed out and cause an accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0013] Figure 2 is a top view schematic diagram of the overall structure of the present utility model;

[0014] Figure 3 is a top view schematic diagram of the internal structure of the present utility model;

[0015] Figure 4 is a side view schematic diagram of the internal structure of the present utility model;

[0016] In the figure: 1. Anti-detachment component body; 2. Hanger; 3. Tubing head; 4. Stepped hole; 5. Set screw;

[0017] 6. Lock nut; 7. Pressure plate; 8. Gland; 9. Packing ring; 10. Packing gland; 11. Fixed plate;

[0018] 12. Threaded rod; 13. Nut sleeve; 14. Small shaft; 15. Connecting seat; 16. Connecting rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to clearly and completely describe the purpose, technical solution of the present utility model, and make its advantages more clearly understood, the following further details the embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present utility model, rather than all of them, and are only used to explain the embodiments of the present utility model, not to limit the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0020] Embodiment 1

[0021] Please refer to Figures 1 - 4 , the present utility model provides a technical solution: an anti - falling component for the top screw of an oil production wellhead, including: the anti - falling component body 1, a hanger 2 is arranged at the top of the anti - falling component body 1, a tubing head 3 is slidably sleeved at the bottom of the hanger 2, stepped holes 4 are opened on both sides of the tubing head 3, a top screw 5 is sleeved in the stepped holes 4, a locking nut 6 is threadedly sleeved at one end of the top screw 5, a pressing plate 7 is arranged on one side of the locking nut 6, and a gland 8 is fixedly connected to one side of the pressing plate 7.

[0022] Insert the top screw 5 into the stepped hole 4 opened on the side wall of the tubing head 3 from the inner hole of the tubing head 3. The length of the top screw 5 is adapted to the inner diameter of the tubing head 3 to facilitate its insertion, so that the large head of the top screw 5 is clamped in the stepped hole 4. Then, the locking nut 6 is used to limit and fix one end of the top screw 5, so that the large head of the top screw 5 abuts against the annular outer surface of the top screw 5. Further, the top screw 5 limits the hanger 2 in the tubing head 3. Thus, even if the thread on the top screw 5 fails due to corrosion, it cannot be pushed out to cause an accident. Then, the movement of the pressing plate 7 drives the gland 8 to press one end of the top screw 5, further limiting and fixing the top screw 5 to prevent the top screw 5 from being pushed out by the internal pressure and causing leakage.

[0023] Embodiment 2

[0024] On the basis of Embodiment 1, a set of two top screws 5 are provided and are symmetrically arranged with respect to the central plane of the tubing head 3. A packing ring 9 is fixedly sleeved at one end of the top screw 5, and a packing gland 10 is sleeved at the other end of the top screw 5. One side of the packing gland 10 abuts against the locking nut 6.

[0025] The stepped holes 4 are opened on both sides of the tubing head 3, so as to facilitate the top screw 5 to limit the hanger 2 from both ends. A packing ring 9 is fixedly sleeved at one end of the top screw 5, which increases the friction and improves the sealing performance at the same time. A packing gland 10 is sleeved at the other end of the top screw 5, further increasing the sealing performance. The locking nut 6 presses the packing gland 10 tightly, thereby limiting and fixing the top screw 5.

[0026] Embodiment 3

[0027] On the basis of the second embodiment, both sides of the pressing plate 7 are slidably connected to the fixing plate 11. One end of the fixing plate 11 is fixedly connected to the outer circumferential surface of the tubing head 3. The other end of the fixing plate 11 is rotatably sleeved with a threaded rod 12. One end of the fixing plate 11 is fixedly connected to the outer circumferential surface of the tubing head 3, so that the fixing plate 11 limits the pressing plate 7, and the other end of the fixing plate 11 supports the threaded rod 12, facilitating its rotation. The threaded rod 12 is provided with two sections of threads with opposite helix directions. The threaded rod 12 is sleeved with a nut sleeve 13. One side of the nut sleeve 13 is fixedly connected with a small shaft 14. A group of nut sleeves 13 are sleeved on the threaded rod 12. The nut sleeve 13 is driven by the rotation of the threaded rod 12. Both sides of the nut sleeve 13 are fixedly connected with small shafts 14, facilitating the movement of the nut sleeve 13. One side of the pressing plate 7 is fixedly connected with a connecting seat 15. The connecting seat 15 is rotatably connected to one end of the connecting rod 16 through a small shaft 14. The other end of the connecting rod 16 is rotatably connected to the nut sleeve 13 through a small shaft 14. One side of the connecting seat 15 is fixedly connected with the pressing plate 7. Thus, the movement of the pressing plate 7 is driven by the movement of the connecting seat 15, and the connecting rod 16 transmits power between the connecting seat 15 and the nut sleeve 13.

[0028] By rotating the crank handle fixedly connected to one end of the threaded rod 12, the crank handle drives the threaded rod 12 to rotate within the fixing plate 11, so that the threaded rod 12 drives the nut sleeve 13 thereon to move. When the two nut sleeves 13 move towards each other, one end of the connecting rod 16 is driven by the connection of the small shaft 14 on the nut sleeve 13. Thus, the other end of the connecting rod 16 drives the connecting seat 15 to move towards the direction close to the setscrew 5 through the rotational connection of the small shaft 14 with the connecting seat 15. Therefore, the connecting seat 15 drives the pressing plate 7 to move towards the setscrew 5. One side of the pressing plate 7 is fixedly connected with the gland 8. Further, the gland 8 approaches the setscrew 5, and the gland 8 presses one end of the setscrew 5, thus avoiding problems such as the failure of the setscrew 5 due to corrosion of its thread, leakage, or even being ejected from the inside, improving the safety and reliability.

[0029] In actual use, the set screw 5 is inserted into the stepped hole 4 opened on the side wall of the tubing head 3 from the inner hole of the tubing head 3. The length of the set screw 5 is adapted to the inner diameter of the tubing head 3, facilitating its insertion. Thus, the large head of the set screw 5 is clamped in the stepped hole 4. Since there is a step in the stepped hole 4, the large head of the set screw 5 is clamped. The stepped holes 4 are opened on both sides of the tubing head 3, facilitating the set screw 5 to limit the hanger 2 from both ends. A packing ring 9 is fixedly sleeved at one end of the set screw 5, increasing the friction and improving the sealing performance at the same time. A packing gland 10 is sleeved at the other end of the set screw 5, further enhancing the sealing performance. The lock nut 6 presses the packing gland 10 tightly, thereby limiting and fixing the set screw 5 and reducing the possibility of it being pushed out from the inside due to the corrosion failure of the thread. By rotating the crank handle fixedly connected to one end of the threaded rod 12, the crank handle drives the threaded rod 12 to rotate in the fixed plate 11, so that the threaded rod 12 drives the nut sleeve 13 thereon to move. When the two nut sleeves 13 move towards each other, one end of the connecting rod 16 is driven to move through the connection of the small shaft 14. Thus, the other end of the connecting rod 16 drives the connection seat 15 to move towards the set screw 5 through the rotational connection of the small shaft 14 with the connection seat 15, so that the connection seat 15 drives the pressing plate 7 to move towards the set screw 5. One side of the pressing plate 7 is fixedly connected to the gland 8, further causing the gland 8 to approach the set screw 5, and the gland 8 presses one end of the set screw 5, thereby preventing the set screw 5 from leaking or even being pushed out from the inside due to the corrosion of the thread thereon, improving the safety and reliability. At the same time, even if the thread of the set screw 5 corrodes and fails, it is impossible for it to be pushed out and cause an accident.

[0030] 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 top screw anti-drop component for an oil production wellhead, comprising an anti-drop component body (1), characterized in that: A hanger (2) is provided at the top of the anti-drop component body (1). The bottom of the hanger (2) is slidably sleeved with a tubing head (3). Step holes (4) are formed on both sides of the tubing head (3). A set screw (5) is sleeved in the step hole (4). A locking nut (6) is threadedly sleeved at one end of the set screw (5). A pressing plate (7) is provided on one side of the locking nut (6). A gland (8) is fixedly connected to one side of the pressing plate (7).

2. The anti-loosening component for the oil production wellhead according to claim 1, wherein: There are two set screws (5) in a group and they are symmetrically arranged with respect to the central plane of the tubing head (3). A packing ring (9) is fixedly sleeved at one end of the set screw (5). A packing gland (10) is sleeved at the other end of the set screw (5). One side of the packing gland (10) abuts against the locking nut (6).

3. The anti-loosening component for the oil production wellhead according to claim 2, characterized in that: Both sides of the pressing plate (7) are slidably connected to a fixing plate (11). One end of the fixing plate (11) is fixedly connected to the outer peripheral surface of the tubing head (3). The other end of the fixing plate (11) is rotatably sleeved with a threaded rod (12).

4. The anti-loosening component for the oil production wellhead according to claim 3, characterized in that: Two sections of threads with opposite thread directions are formed on the threaded rod (12). A screw sleeve (13) is sleeved on the threaded rod (12). A small shaft (14) is fixedly connected to one side of the screw sleeve (13).

5. The anti-loosening component of a jackscrew for an oil production wellhead according to claim 4, characterized in that: A connecting seat (15) is fixedly connected to one side of the pressing plate (7). One end of the connecting rod (16) is rotatably connected to the connecting seat (15) through the small shaft (14). The other end of the connecting rod (16) is rotatably connected to the screw sleeve (13) through the small shaft (14).

Images