A direct connection type bushing

Abstract

The application provides a direct connection type casing and relates to the field of oil casings. The direct connection type casing comprises a pipe body, one end of the pipe body is fixedly connected with an external thread, one end of the pipe body close to the external thread is slidably connected with a sliding ring, one end of the pipe body close to the sliding ring is fixedly connected with a pressing ring, one end of the pipe body away from the external thread is fixedly connected with a first ratchet, an internal thread is arranged in one end of the pipe body away from the external thread, a plurality of grooves are formed in one end of the pipe body close to the sliding ring, and a protrusion is slidably connected in each groove. The inner wall of the sliding ring is fixedly connected with the protrusion, and a sampling mechanism is fixedly connected through the pipe body. The ratchets arranged at both ends of the pipe body and the sampling mechanism arranged on the pipe body make the connection between the pipe bodies more compact, prevent the pipe bodies from being separated, and facilitate sampling of the liquid in the pipe through the sampling mechanism.

Description

Technical Field

[0001] This invention relates to the field of oil casing technology, specifically a direct-connection casing. Background Technology

[0002] Straight-connect casing is a type of threaded connection without couplings. Its structural feature is that both ends of the casing are machined with internal and external threads, respectively, allowing for direct connection between the two pipes. It is mainly used in small-bore drilling, windowed sidetracking, and for repairing damaged wells by running small casing. Compared to casing with couplings, straight-connect casing does not increase the outer diameter significantly, thus allowing for smooth passage through existing wellbores and avoiding wellbore enlargement issues.

[0003] Chinese invention patent CN107558934A discloses a direct-connection sleeve threaded joint, which adopts a submerged design and processing method. When meeting the requirement of h = (25%~40%)T, the wall thickness at the sealing surface is increased, which can improve the stability of the sealing performance and improve the compression resistance of the pipe body. However, existing direct-connection sleeves require the addition of multi-port pipes and valves for sampling, which is more material-intensive. At the same time, its sealing performance is affected by the thread processing, which has a high processing difficulty. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a direct-connection sleeve, which solves the problems of inconvenient sampling of direct-connection sleeves and the high processing difficulty caused by the influence of thread processing on the sealing performance of the sleeve.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a direct-connection sleeve comprising a tube body, one end of which is fixedly connected to an external thread, a sliding ring slidably connected to the end of the tube body near the external thread, a compression ring fixedly connected to the end of the tube body near the sliding ring, a first ratchet fixedly connected to the end of the tube body away from the external thread, an internal thread provided in the end of the tube body away from the external thread, a plurality of grooves provided in the end of the tube body near the sliding ring, each groove having a protrusion slidably connected therein, the inner wall of the sliding ring being fixedly connected to the protrusion, and a sampling mechanism being fixedly connected through the tube body.

[0008] The above technical solution allows for tighter pipe connection and more convenient sampling via the sampling mechanism.

[0009] Preferably, a fixing groove is provided at one end of the tube body near the sliding ring, and a compression ring is fixedly connected in the fixing groove. Both ends of the compression ring are provided with round holes. A second ratchet is fixedly connected to the side of the sliding ring away from the tube body. The first ratchet and the second ratchet mesh with each other. The compression ring is made of rubber, and the first ratchet and the second ratchet are both made of stainless steel.

[0010] The above technical solution allows the second ratchet to press against the first ratchet, improving the tightness of the engagement.

[0011] Preferably, the sampling mechanism includes a sampling tube, with a sampling tube fixedly connected to the inner wall of the tube body, a circular groove opened on the outer wall of the tube body near the sampling tube, a fixing plate fixedly connected to the bottom end of the sampling tube, a plurality of first through holes opened on the fixing plate, a spring fixedly connected to the upper surface of the fixing plate, and a sealing plate fixedly connected to the end of the spring away from the fixing plate.

[0012] The above technical solution enables the sealing plate to automatically seal under the action of the spring.

[0013] Preferably, a baffle is fixedly connected inside the sampling tube, and a second through hole is provided on the baffle. The baffle is located on the upper surface of the sealing plate. A third through hole is provided at the bottom end of the circular groove. A movable tube is slidably connected through the third through hole. A plurality of sampling holes are provided at one end of the movable tube near the baffle. A slider is fixedly connected to one side of the movable tube. The bottom end of the movable tube is flat. The movable tube is slidably connected through the baffle.

[0014] The above technical solution allows the liquid inside the tube to enter the movable tube through the first through hole, the second through hole, and the point through hole, and then flow out through the movable tube.

[0015] Preferably, a fixed sleeve is fixedly connected to the bottom of the circular groove, a slide rail is provided on one side of the fixed sleeve, a limiting groove is provided at the end of the circular groove near the sampling tube, a rotating sleeve is rotatably connected to the circular groove, a slide rail is provided in the rotating sleeve, a limiting plate is fixedly connected to the outside of the end of the rotating sleeve near the sampling tube, the limiting plate and the limiting groove slide against each other, the limiting plate and the fixed sleeve are integrally formed, and the fixed sleeve and the movable tube are concentrically arranged.

[0016] Preferably, the rotating sleeve has anti-slip textured edges at the end away from the sampling tube, the slide groove and the slider slide in mutual cooperation, the slide track and the slider slide in mutual cooperation, the rotating sleeve is made of stainless steel, and the limiting plate and the limiting groove slide in mutual cooperation.

[0017] The above technical solution allows the movable tube to move down and push open the sealing plate under the action of rotating the sleeve.

[0018] Preferably, the sealing plate is made of rubber, the sampling tube is made of stainless steel, the sampling tube and the fixing plate are integrally formed, the sealing plate and the sampling tube slide against each other, and the diameter of the sealing plate is larger than the second through hole.

[0019] The above technical solutions can improve the sealing effect of the sealing plate and increase the structural strength of the sampling tube.

[0020] Preferably, the tube body is made of stainless steel, the sliding ring and the protrusion are integrally formed, both the sliding ring and the protrusion are made of stainless steel, the outer surface of the tube body is coated with epoxy resin, and the sliding ring is concentrically arranged with the tube body.

[0021] The above technical solutions can improve the corrosion resistance of the pipe body and increase the structural strength of the sliding ring.

[0022] Working principle: The internal thread 12 of tube 1 is aligned with the external thread 2 of another tube 1 and rotated to bring the tubes 1 closer together. When rotated to the bottom, the first ratchet 6 and the second ratchet 9 engage. At this time, the second ratchet 9 pushes the sliding ring 3 to slide along the groove 7. The sliding ring 3 is supported by the compression ring 4, which compresses the connection of the tubes 1 to both sides, making the internal thread 12 and the external thread 2 engage more tightly and preventing loosening between the tubes 1. When it is necessary to disassemble the tubes 1, the compression ring 4 is hooked through the round hole 11 and pulled open, allowing the sliding ring 3 to move on the groove 7, causing the first ratchet 6 to engage. 6. The second ratchet 9 disengages, allowing the tube body 1 to rotate and separate. When sampling is required, the rotating sleeve 516 is rotated, causing the slider 510 to move. Under the limit of the slide rail 514, the slider 510 moves downward along the slide rail 514, causing the movable tube 58 to move downward, pushing open the sealing plate 55, allowing the liquid in the tube to enter the movable tube 58 through the first through hole 53, the second through hole 57, and the sampling hole 59, and then flow out. After the sampling is completed, the rotating sleeve 516 is rotated in the opposite direction, causing the movable tube 58 to move upward. At this time, the sealing plate 55 descends under the action of the spring 54, closing and sealing the second through hole 57.

[0023] (III) Beneficial Effects

[0024] This invention provides a direct-connection sleeve. It has the following advantages:

[0025] This invention improves the sealing performance between pipe bodies by setting a first ratchet at one end of the pipe body, a sliding ring at the other end, and a second ratchet on the sliding ring. The meshing of the ratchets restricts the relative rotation between the pipe bodies, thereby improving the sealing performance between the pipe bodies. Furthermore, the compression ring allows the first and second ratchets to mesh more tightly. When disassembly is required, the compression ring can be pulled apart to both sides. Simultaneously, a sampling mechanism is installed on the pipe body. By rotating the pipe sleeve and cooperating with the fixed pipe sleeve, the movable pipe moves up and down, opening the sealing plate and facilitating sampling. Sampling can be performed without adding a valve body to the pipeline, greatly reducing production costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a cross-sectional view of the convex interface of the present invention;

[0028] Figure 3 This is a structural diagram of the recessed interface of the present invention;

[0029] Figure 4 This is a cross-sectional view of the sampling mechanism of the present invention;

[0030] Figure 5 This is a perspective view of the sampling mechanism of the present invention;

[0031] Figure 6 This is a structural diagram of the knob of the present invention.

[0032] The components are as follows: 1. Tube body; 2. External thread; 3. Sliding ring; 4. Compression ring; 5. Sampling mechanism; 51. Sampling tube; 52. Fixing plate; 53. First through hole; 54. Spring; 55. Sealing plate; 56. Baffle; 57. Second through hole; 58. Movable tube; 59. Sampling hole; 510. Sliding block; 511. Circular groove; 512. Third through hole; 513. Fixing sleeve; 514. Slide rail; 515. Limiting groove; 516. Rotating sleeve; 517. Limiting plate; 518. Slide groove; 519. Anti-slip texture; 6. First ratchet; 7. Groove; 8. Protrusion; 9. Second ratchet; 10. Fixing groove; 11. Circular hole; 12. Internal thread. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1:

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a direct-connection sleeve, including a tube body 1. One end of the tube body 1 is fixedly connected to an external thread 2. A sliding ring 3 is slidably connected to the end of the tube body 1 near the external thread 2. A compression ring 4 is fixedly connected to the end of the tube body 1 near the sliding ring 3. A first ratchet 6 is fixedly connected to the end of the tube body 1 away from the external thread 2. An internal thread 12 is provided in the end of the tube body 1 away from the external thread 2. A plurality of grooves 7 are provided in the end of the tube body 1 near the sliding ring 3. A protrusion 8 is slidably connected in each groove 7. The inner wall of the sliding ring 3 is fixedly connected to the protrusion 8. A sampling mechanism 5 is fixedly connected through the tube body 1.

[0036] A fixing groove 10 is provided at one end of the tube body 1 near the sliding ring 3. A compression ring 4 is fixedly connected in the fixing groove 10. Both ends of the compression ring 4 are provided with round holes 11. A second ratchet 9 is fixedly connected on the side of the sliding ring 3 away from the tube body 1. The first ratchet 6 and the second ratchet 9 mesh with each other. The compression ring 4 is made of rubber, and the first ratchet 6 and the second ratchet 9 are both made of stainless steel.

[0037] like Figure 4 , Figure 5 and Figure 6 As shown, the sampling mechanism 5 includes a sampling tube 51. The sampling tube 51 is fixedly connected to the inner wall of the tube body 1. A circular groove 511 is opened on the outer wall of the tube body 1 near the sampling tube 51. A fixing plate 52 is fixedly connected to the bottom end of the sampling tube 51. Several first through holes 53 are opened on the fixing plate 52. A spring 54 is fixedly connected to the upper surface of the fixing plate 52. A sealing plate 55 is fixedly connected to the end of the spring 54 away from the fixing plate 52. A baffle 56 is fixedly connected inside the sampling tube 51. A second through hole 57 is opened on the baffle 56. The baffle 56 is located on the upper surface of the sealing plate 55. A third through hole 512 is opened at the bottom end of the circular groove 511. A movable tube 58 is slidably connected through the third through hole 512. Several sampling holes 59 are opened at the end of the movable tube 58 near the baffle 56. A slider 510 is fixedly connected to one side of the movable tube 58. The bottom end of the movable tube 58 is flat. The movable tube 58 is slidably connected through the baffle 56.

[0038] A fixed sleeve 513 is fixedly connected to the bottom of the circular groove 511. A slide rail 514 is provided on one side of the fixed sleeve 513. A limiting groove 515 is provided at the end of the circular groove 511 near the sampling tube 51. A rotating sleeve 516 is rotatably connected inside the circular groove 511. A slide rail 518 is provided inside the rotating sleeve 516. A limiting plate 517 is fixedly connected to the outside of the end of the rotating sleeve 516 near the sampling tube 51. The limiting plate 517 and the limiting groove 515 slide against each other. The limiting plate 517 and the fixed sleeve 513 are integrated. The fixed sleeve 513 and the movable tube 58 are concentric. An anti-slip texture 519 is provided on the outside of the end of the rotating sleeve 516 away from the sampling tube 51. The slide rail 518 slides against the slider 510. The slide rail 514 slides against the slider 510. The rotating sleeve 516 is made of stainless steel. The limiting plate 517 and the limiting groove 515 slide against each other.

[0039] The sealing plate 55 is made of rubber, the sampling tube 51 is made of stainless steel, the sampling tube 51 and the fixing plate 52 are integrated, the sealing plate 55 and the sampling tube 51 slide against each other, the diameter of the sealing plate 55 is larger than the second through hole 57, the tube body 1 is made of stainless steel, the sliding ring 3 and the protrusion 8 are integrated, both the sliding ring 3 and the protrusion 8 are made of stainless steel, the outer surface of the tube body 1 is coated with epoxy resin, and the sliding ring 3 and the tube body 1 are concentrically arranged.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct-connection type sleeve, comprising a sleeve body (1), characterized in that: One end of the tube (1) is fixedly connected to an external thread (2), the end of the tube (1) near the external thread (2) is slidably connected to a sliding ring (3), the end of the tube (1) near the sliding ring (3) is fixedly connected to a compression ring (4), the end of the tube (1) away from the external thread (2) is fixedly connected to a first ratchet (6), the end of the tube (1) away from the external thread (2) is provided with an internal thread (12), the end of the tube (1) near the sliding ring (3) is provided with several grooves (7), each groove (7) is slidably connected to a protrusion (8), the inner wall of the sliding ring (3) is fixedly connected to the protrusion (8), and a sampling mechanism (5) is fixedly connected through the tube (1). The tube body (1) has a fixed groove (10) at one end near the sliding ring (3), and a compression ring (4) is fixedly connected in the fixed groove (10). Both ends of the compression ring (4) have round holes (11). The sliding ring (3) is fixedly connected to a second ratchet (9) on the side away from the tube body (1). The first ratchet (6) and the second ratchet (9) mesh with each other. The compression ring (4) is made of rubber, and the first ratchet (6) and the second ratchet (9) are both made of stainless steel. The sampling mechanism (5) includes a sampling tube (51), the inner wall of the tube body (1) is fixedly connected to the sampling tube (51), the outer wall of the tube body (1) is provided with a circular groove (511) near the sampling tube (51), the bottom end of the sampling tube (51) is fixedly connected to a fixing plate (52), the fixing plate (52) is provided with a plurality of first through holes (53), the upper surface of the fixing plate (52) is fixedly connected to a spring (54), and the end of the spring (54) away from the fixing plate (52) is fixedly connected to a sealing plate (55). A baffle (56) is fixedly connected inside the sampling tube (51). A second through hole (57) is provided on the baffle (56). The baffle (56) is located on the upper surface of the sealing plate (55). A third through hole (512) is provided at the bottom end of the circular groove (511). A movable tube (58) is slidably connected through the third through hole (512). Several sampling holes (59) are provided at one end of the movable tube (58) near the baffle (56). A slider (510) is fixedly connected to one side of the movable tube (58). The bottom end of the movable tube (58) is flat. The movable tube (58) is slidably connected through the baffle (56).

2. The direct-connection sleeve according to claim 1, characterized in that: A fixed sleeve (513) is fixedly connected to the bottom of the circular groove (511). A slide (514) is provided on one side of the fixed sleeve (513). A limiting groove (515) is provided at one end of the circular groove (511) near the sampling tube (51). A rotating sleeve (516) is rotatably connected inside the circular groove (511). A slide groove (518) is provided inside the rotating sleeve (516). A limiting plate (517) is fixedly connected to the outside of one end of the rotating sleeve (516) near the sampling tube (51). The limiting plate (517) and the limiting groove (515) slide against each other. The limiting plate (517) and the fixed sleeve (513) are integrated. The fixed sleeve (513) and the movable tube (58) are concentrically arranged.

3. A direct-connection sleeve according to claim 2, characterized in that: The rotating sleeve (516) has anti-slip texture (519) on the end away from the sampling tube (51), the slide groove (518) and the slider (510) slide in each other, the slide rail (514) and the slider (510) slide in each other, and the rotating sleeve (516) is made of stainless steel.

4. A direct-connection sleeve according to claim 3, characterized in that: The sealing plate (55) is made of rubber, the sampling tube (51) is made of stainless steel, the sampling tube (51) and the fixing plate (52) are integrated, the sealing plate (55) and the sampling tube (51) slide together, and the diameter of the sealing plate (55) is larger than the second through hole (57).

5. A direct-connection sleeve according to claim 1, characterized in that: The tube body (1) is made of stainless steel. The sliding ring (3) and the protrusion (8) are integrated. Both the sliding ring (3) and the protrusion (8) are made of stainless steel. The outer surface of the tube body (1) is coated with epoxy resin paint. The sliding ring (3) and the tube body (1) are concentrically arranged.

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