A reverse buckle for oil casing

Abstract

This utility model relates to the field of oil casing fitting technology and discloses a reverse threaded fitting for oil casing, including a fitting seat. The fitting seat has a first inner cavity and a second inner cavity at its upper and lower ends, respectively, and a through hole is formed at the middle of the first and second inner cavities. When the first casing is screwed into the middle of the fitting seat, the connecting sleeve rotates downwards. When the lower end of the connecting sleeve contacts the wedge, the lower end of the connecting sleeve slides downwards along the inclined surface of the wedge, and the elastic rod deforms accordingly. After the connecting sleeve is inserted into the mounting groove, the stabilizing groove and the wedge are on the same horizontal line, the elastic rod returns to its original deformation, and the wedge is inserted into the stabilizing groove, thereby fixing the first casing in the middle of the fitting seat. Combined with the left-hand helical design of the threaded sleeve, this ensures a more stable connection between the first casing and the fitting seat, preventing loosening and potential oil leakage.

Description

Technical Field

[0001] This utility model relates to the field of oil casing fittings technology, and in particular to a reverse threaded fitting for oil casing. Background Technology

[0002] Casing couplings are important tools used in oil and gas drilling to connect two sections of casing or tubing. They mainly serve to connect and seal. Typically, casing couplings are short pipes made of high-strength steel with internal threads, used to connect two casings end to end. This threaded connection has a certain sealing capability, which can prevent the leakage of fluids or gases in the well, thereby protecting the wellbore and formation and maintaining the stability of the wellbore.

[0003] However, existing casing joints often connect two casings end to end using only threads. This type of connection can become loose over time. When the threads become loose, the sealing between the two casings will decrease, making it easy for oil to leak from the joint between the two sets of casings, thus causing unnecessary losses. Utility Model Content

[0004] Given that existing casing joints often connect two casings end to end using only threads, this connection method can become loose over time. When the threads become loose, the sealing between the two casings will decrease, making it easy for oil to leak from the joint between the two sets of casings, thus causing unnecessary losses. Therefore, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a reverse threaded connector for oil casing, including a connector seat, wherein the upper and lower ends of the connector seat are respectively provided with a first inner cavity and a second inner cavity, and a through hole is provided in the middle between the first inner cavity and the second inner cavity. A first sleeve is inserted into the middle of the connector seat, and the lower end of the first sleeve passes through the first inner cavity and the through hole and is connected to a stabilizing component. The stabilizing component includes a connecting sleeve provided at the lower end of the first sleeve, a stabilizing sleeve fitted at the lower end of the connecting sleeve, an installation groove that mates with the connecting sleeve being provided on the inner wall of the upper end of the stabilizing sleeve, two sets of mutually symmetrical elastic rods being provided at the upper end of the stabilizing sleeve, a wedge being provided at the upper end of the elastic rods, and a stabilizing groove that mates with the wedge being provided on the outer wall of the upper end of the connecting sleeve.

[0006] As a preferred embodiment of the reverse threaded connector for oil casing of this utility model, the first casing moves sequentially from top to bottom through the first inner cavity, the connecting hole and the second inner cavity, and the first casing is fixedly fitted with a sealing sleeve at the upper end of the connector seat.

[0007] As a preferred embodiment of the reverse threaded connector for oil casing of this utility model, wherein: a threaded sleeve is fixedly fitted on the outer wall of the first casing at the lower end of the sealing sleeve, the threaded sleeve is threadedly inserted into the upper end of the connector seat, and the thread of the threaded sleeve is a left-hand helix.

[0008] As a preferred embodiment of the reverse threaded connector for oil casing of this utility model, the lower end of the connecting sleeve is movably inserted into the mounting groove, the upper end of the stabilizing sleeve is provided with multiple sets of filter holes, and the wedge is movably inserted into the stabilizing groove.

[0009] In a preferred embodiment of the reverse threaded connector for oil casing according to this utility model, the second inner cavity is provided with an installation assembly, which includes a bidirectional threaded rod disposed on the inner wall of the second inner cavity. The two ends of the bidirectional threaded rod are rotatably connected to the inner wall of the second inner cavity. Two sets of symmetrical adjusting plates are sleeved on the outer wall of the bidirectional threaded rod. The adjusting plates have threaded holes that mate with the bidirectional threaded rod. A worm gear is fixedly sleeved on the outer wall of the middle end of the bidirectional threaded rod. A worm is rotatably inserted into the lower outer wall of the connector seat located in the second inner cavity. The worm and the worm gear mesh with each other. A sealing ring is movably sleeved on the outer wall of the worm. The sealing ring is fixedly connected to the outer wall of the connector seat.

[0010] As a preferred embodiment of the reverse threaded connector for oil casing of this utility model, wherein: the adjusting plates are fixedly provided with insert rods at their middle ends close to each other, the outer wall of the stabilizing sleeve is fixedly provided with two sets of symmetrical mounting blocks, the outer wall of the middle end of the mounting block is provided with a socket hole that cooperates with the insert rod, the insert rod is movably inserted into the socket hole, and the adjusting plate and the bidirectional screw are movably inserted with a sliding rod at one end symmetrically opposite to each other, the sliding rod being fixedly connected to the inner wall of the second inner cavity.

[0011] As a preferred embodiment of the reverse threaded connector for oil casing of this utility model, a second casing is fixedly inserted at the lower end of the connector seat.

[0012] As a preferred embodiment of the reverse threaded connector for oil casing of this utility model, wherein: a sealing plug is fixedly sleeved on the upper end of the first casing at the connecting hole, and a pressure plate is fixedly sleeved on the outer wall of the upper end of the first casing at the sealing plug.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] In this invention, the thread of the threaded sleeve is a left-handed helix. Compared to a right-handed helix, during the process of the first sleeve being screwed into the connector seat, the rotational torque generated by the weight of the first sleeve is counterclockwise when viewed from below, which is opposite to the direction of the thread. The loosening direction of the reverse thread is opposite to the rotational torque generated by its own weight, forming a self-locking effect of "the looser it is, the tighter it becomes", effectively preventing the thread from loosening.

[0015] 2. In this utility model, when the first sleeve is screwed into the middle of the connector seat, the connecting sleeve rotates downward. When the lower end of the connecting sleeve contacts the wedge, the lower end of the connecting sleeve slides downward along the inclined surface of the wedge, and the elastic rod deforms accordingly. After the connecting sleeve is inserted into the mounting groove, the stabilizing groove and the wedge are on the same horizontal line, the elastic rod returns to its original deformation, and the wedge is inserted into the stabilizing groove, thereby fixing the first sleeve in the middle of the connector seat. Combined with the left-hand spiral design of the threaded sleeve, the first sleeve is more firmly connected to the connector seat, avoiding loose connection between the first sleeve and the connector seat, which could lead to oil leakage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the reverse threaded connector for oil casing of this utility model;

[0017] Figure 2 This is a three-dimensional cross-sectional view of the overall structure of the reverse threaded connector for oil casing of this utility model.

[0018] Figure 3 This is an exploded three-dimensional structural diagram of the stabilizing component of the reverse threaded joint for oil casing of this utility model.

[0019] Figure 4 This is a three-dimensional structural diagram of the installation assembly of the reverse threaded connector for oil casing according to this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the sealing plug and pressure plate of the reverse threaded connector for oil casing of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Connector seat; 2. First inner cavity; 3. Second inner cavity; 4. First sleeve; 5. Stabilizing component; 51. Connecting sleeve; 52. Stabilizing sleeve; 53. Mounting groove; 54. Filter hole; 55. Elastic rod; 56. Wedge; 57. Stabilizing groove; 58. Mounting block; 6. Mounting component; 61. Two-way lead screw; 62. Adjusting plate; 63. Slide rod; 64. Insert rod; 65. Worm gear; 66. Worm; 67. Sealing ring; 7. Threaded sleeve; 8. Sealing sleeve; 9. Connecting hole; 10. Sealing plug; 11. Pressure plate; 12. Second sleeve. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0024] Reference Figures 1-5This is the first embodiment of the present invention, which provides a reverse threaded connector for oil casing, including a connector seat 1. The connector seat 1 has a first inner cavity 2 and a second inner cavity 3 respectively opened at its upper and lower ends. A connecting hole 9 is opened through the middle of the first inner cavity 2 and the second inner cavity 3. A first sleeve 4 is inserted into the middle of the connector seat 1. The lower end of the first sleeve 4 passes through the first inner cavity 2 and the connecting hole 9 and is connected to a stabilizing component 5. The stabilizing component 5 includes a connecting sleeve 51 located at the lower end of the first sleeve 4. A stabilizing sleeve 52 is fitted at the lower end of the connecting sleeve 51. An installation groove 53 that cooperates with the connecting sleeve 51 is opened on the inner wall of the upper end of the stabilizing sleeve 52. Two sets of elastic rods 55 that are symmetrically arranged are provided at the upper end of the stabilizing sleeve 52. A wedge 56 is opened at the upper end of the elastic rods 55. A stabilizing groove 57 that cooperates with the wedge 56 is opened on the outer wall of the upper end of the connecting sleeve 51.

[0025] The first sleeve 4 moves from top to bottom through the first inner cavity 2, the connecting hole 9, and the second inner cavity 3. The first sleeve 4 is fixedly fitted with a sealing sleeve 8 at the upper end of the connector seat 1.

[0026] The outer wall of the first sleeve 4 is fixedly fitted with a threaded sleeve 7 at the lower end of the sealing sleeve 8. The threaded sleeve 7 is threaded into the upper end of the connector seat 1, and the thread of the threaded sleeve 7 is a left-handed helix.

[0027] The lower end of the connecting sleeve 51 is movably inserted into the mounting groove 53, the upper end of the stabilizing sleeve 52 has multiple sets of filter holes 54, and the wedge 56 is movably inserted into the stabilizing groove 57.

[0028] The second inner cavity 3 is equipped with an installation assembly 6, which includes a bidirectional lead screw 61 located on the inner wall of the second inner cavity 3. The two ends of the bidirectional lead screw 61 are rotatably connected to the inner wall of the second inner cavity 3. Two sets of symmetrical adjusting plates 62 are sleeved on the outer wall of the bidirectional lead screw 61. The adjusting plates 62 have threaded holes that cooperate with the bidirectional lead screw 61. A worm gear 65 is fixedly sleeved on the outer wall of the middle end of the bidirectional lead screw 61. A worm 66 is rotatably inserted into the lower outer wall of the connector seat 1. The worm 66 and the worm gear 65 mesh with each other. A sealing ring 67 is movably sleeved on the outer wall of the worm 66. The sealing ring 67 is fixedly connected to the outer wall of the connector seat 1.

[0029] The adjusting plate 62 is fixedly provided with a plug rod 64 at its middle end, and two sets of symmetrical mounting blocks 58 are fixedly provided on the outer wall of the stabilizing sleeve 52. The middle outer wall of the mounting block 58 is provided with a plug hole that matches the plug rod 64. The plug rod 64 is movably inserted into the plug hole. The adjusting plate 62 and the bidirectional screw 61 are symmetrically provided with a sliding rod 63 at one end. The sliding rod 63 is fixedly connected to the inner wall of the second inner cavity 3.

[0030] The lower end of the connector 1 is fixedly inserted with a second sleeve 12.

[0031] The first sleeve 4 is fixedly fitted with a sealing plug 10 at the upper end of the connecting hole 9, and the first sleeve 4 is fixedly fitted with a pressure plate 11 on the outer wall of the upper end of the sealing plug 10.

[0032] When the first sleeve 4 and the connector 1 need to be connected, the first sleeve 4 is spirally inserted into the middle of the connector 1. The lower end of the first sleeve 4 passes through the connecting hole 9, and the sealing plug 10 contacts the upper end of the connecting hole 9. The first sleeve 4 drives the pressure plate 11 to continue moving downward, squeezing the sealing plug 10. The sealing plug 10 deforms and seals the connecting hole 9, thus preventing the oil in the second inner cavity 3 from flowing into the first inner cavity 2. The thread of the threaded sleeve 7 is a left-hand helix, which, relative to the right-hand helix, ensures that during the process of the first sleeve 4 being screwed into the connector 1, due to the first... The rotational torque generated by the self-weight of the first sleeve 4 is counterclockwise when viewed from bottom to top, opposite to the direction of the thread. The loosening direction of the reverse thread is opposite to the rotational torque generated by its own weight, forming a self-locking effect of "the looser it is, the tighter it becomes," effectively preventing the thread from loosening. When the first sleeve 4 is screwed into the middle of the connector seat 1, the connecting sleeve 51 at the lower end of the first sleeve 4 rotates downward. When the lower end of the connecting sleeve 51 contacts the wedge 56, the lower end of the connecting sleeve 51 slides downward along the inclined surface of the wedge 56, and the elastic rod 55 deforms accordingly. When the connecting sleeve 51 is inserted into the installation... After entering groove 53, stabilizing groove 57 and wedge 56 are on the same horizontal line. Elastic rod 55 returns to its original deformation, and wedge 56 inserts into stabilizing groove 57, thus fixing the first sleeve 4 to the middle of connector seat 1. Combined with the left-hand spiral design of threaded sleeve 7, this ensures a more secure connection between the first sleeve 4 and connector seat 1, preventing loosening and potential oil leakage. Filter hole 54 can filter larger particles in the oil, improving oil quality. When cleaning or maintaining filter hole 54 is required... During maintenance, rotating the worm gear 66 drives the worm wheel 65 to rotate, the two sets of adjusting plates 62 move away from each other, and the adjusting plates 62 slide along the slide rod 63, thereby moving the two sets of insert rods 64 away from each other and pulling them out of the mounting block 58. Then, rotating the first sleeve 4 in the opposite direction pulls the first sleeve 4 out from the middle of the connector seat 1. The stabilizing sleeve 52 moves out of the connector seat 1 together with the connecting sleeve 51. Then, the elastic rod 55 is pushed to both sides, and the wedge 56 moves out of the stabilizing groove 57, separating the stabilizing sleeve 52 and the connecting sleeve 51, thus facilitating the separate cleaning and maintenance of the stabilizing sleeve 52.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A reverse threaded connector for oil casing, comprising a connector seat (1), characterized in that: The connector seat (1) has a first inner cavity (2) and a second inner cavity (3) at its upper and lower ends respectively. A connecting hole (9) is provided through the middle of the first inner cavity (2) and the second inner cavity (3). A first sleeve (4) is inserted into the middle of the connector seat (1). The lower end of the first sleeve (4) passes through the first inner cavity (2) and the connecting hole (9) and is connected to a stabilizing component (5). The stabilizing component (5) includes a connecting sleeve (51) at the lower end of the first sleeve (4). A stabilizing sleeve (52) is fitted at the lower end of the connecting sleeve (51). An installation groove (53) that matches the connecting sleeve (51) is provided on the inner wall of the upper end of the stabilizing sleeve (52). Two sets of elastic rods (55) are provided symmetrically at the upper end of the stabilizing sleeve (52). A wedge (56) is provided at the upper end of the elastic rod (55). A stabilizing groove (57) that matches the wedge (56) is provided on the outer wall of the upper end of the connecting sleeve (51).

2. The reverse threaded connector for oil casing according to claim 1, characterized in that: The first sleeve (4) moves through the first inner cavity (2), the connecting hole (9) and the second inner cavity (3) from top to bottom. The first sleeve (4) is fixedly fitted with a sealing sleeve (8) at the upper end of the connector seat (1).

3. The reverse threaded connector for oil casing according to claim 1, characterized in that: The outer wall of the first sleeve (4) is fixedly fitted with a threaded sleeve (7) at the lower end of the sealing sleeve (8). The threaded sleeve (7) is threaded into the upper end of the connector seat (1). The thread of the threaded sleeve (7) is a left-handed helix.

4. The reverse threaded connector for oil casing according to claim 1, characterized in that: The lower end of the connecting sleeve (51) is movably inserted into the mounting groove (53), the upper end of the stabilizing sleeve (52) is provided with multiple sets of filter holes (54), and the wedge (56) is movably inserted into the stabilizing groove (57).

5. The reverse threaded connector for oil casing according to claim 1, characterized in that: The second inner cavity (3) is provided with an installation assembly (6). The installation assembly (6) includes a bidirectional lead screw (61) disposed on the inner wall of the second inner cavity (3). The two ends of the bidirectional lead screw (61) are rotatably connected to the inner wall of the second inner cavity (3). The outer wall of the bidirectional lead screw (61) is fitted with two sets of symmetrical adjusting plates (62). The adjusting plates (62) have threaded holes that cooperate with the bidirectional lead screw (61). The outer wall of the middle end of the bidirectional lead screw (61) is fixedly fitted with a worm gear (65). The connector seat (1) is located on the lower outer wall of the second inner cavity (3) and a worm (66) is rotatably inserted therein. The worm (66) and the worm gear (65) mesh with each other. The outer wall of the worm (66) is movably fitted with a sealing ring (67). The sealing ring (67) is fixedly connected to the outer wall of the connector seat (1).

6. The reverse threaded connector for oil casing according to claim 5, characterized in that: The adjusting plate (62) is fixedly provided with a plug rod (64) at the middle of its close proximity. The outer wall of the stabilizing sleeve (52) is fixedly provided with two sets of symmetrical mounting blocks (58). The outer wall of the middle end of the mounting block (58) is provided with a plug hole that matches the plug rod (64). The plug rod (64) is movably inserted into the plug hole. The adjusting plate (62) and the bidirectional screw (61) are movably inserted with a slide rod (63) at one end of their symmetrical arrangement. The slide rod (63) is fixedly connected to the inner wall of the second inner cavity (3).

7. The reverse threaded connector for oil casing according to claim 6, characterized in that: The lower end of the connector (1) is fixedly inserted with a second sleeve (12).

8. The reverse threaded connector for oil casing according to claim 1, characterized in that: The first sleeve (4) is fixedly fitted with a sealing plug (10) at the upper end of the connecting hole (9), and a pressure plate (11) is fixedly fitted on the outer wall of the upper end of the first sleeve (4) and the sealing plug (10).

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