A petroleum casing joint

Abstract

The present invention relates to the technical field of oil casing, specifically to an oil casing joint, comprising a threaded male joint and a threaded female joint symmetrically connected at both ends of the casing, the threaded male joint and the threaded female joint are a pair of matching tapered threaded joints, an annular outer tube is rotatably mounted on the outer wall of the threaded male joint close to one end of the casing, and the threaded male joint is located inside the annular outer tube, a plurality of convex plates are fixedly mounted on the outer wall of the threaded female joint, a plurality of convex plate grooves corresponding to the convex plates are provided on the inner side wall of the annular outer tube, and a plurality of connecting blocks are elastically connected to the bottom end of the annular outer tube. The present invention can conveniently connect the threaded male joint to the threaded female joint quickly and accurately by setting the annular outer tube, and can avoid collision and wear of the threads during connection, and after connection, the interface between the threaded male joint and the threaded female joint is sealed on the inner side of the annular outer tube, thereby improving the sealing performance of the connection between the threaded male joint and the threaded female joint, and improving the sealing performance and use effect of the oil casing joint.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum casing, in particular to a petroleum casing joint. Background Art

[0002] Oil casing is a steel pipe used to support the wellbore of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion. Each well uses several layers of casing according to the different drilling depths and geological conditions. Cement is used to cement the casing after it is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a disposable consumable material.

[0003] After searching, Chinese patent No. CN104563905B discloses a deep-sea oil drilling casing joint anti-rotation structure, which is composed of a threaded male joint, a threaded female joint, a wedge and a screw. The threaded male joint and the threaded female joint are a pair of matching tapered threaded joints, which are respectively connected to the two ends of the casing. The wedge is provided with a shoulder on the side facing the threaded female joint, and straight teeth are provided on the inclined surface of the upper shoulder. The lower shoulder is a right angle, and the outward vertical surface is provided with straight teeth perpendicular to the plane. The other side opposite to the shoulder is an inclined surface. The wedge is embedded in grooves evenly distributed on the outer wall of the threaded male joint. The wedge contacts the end face of the pipe mouth of the threaded female joint that has been screwed in with the toothed side. When the screw is used to position and lock, the straight teeth on the side of the wedge are embedded in the end face of the pipe mouth of the threaded female joint. The two are embedded and connected to form an anti-rotation structure for the threaded male joint and the threaded female joint.

[0004] Although the above-mentioned deep-sea oil drilling casing joint anti-rotation structure can play an anti-rotation role, it still has the following shortcomings:

[0005] 1. Due to the large size and weight of the casing, it is difficult to quickly and accurately connect the threaded male connector to the threaded female connector during connection. Not only is the operation troublesome and labor-intensive, but the threads are easily damaged and worn during connection, which will lead to poor stability and sealing of the connection between the threaded male connector and the threaded female connector.

[0006] 2. After the connection, the interface between the threaded male joint and the threaded female joint is directly exposed to the outside, which will lead to poor sealing of the connection between the threaded male joint and the threaded female joint. In addition, the screws after the connection are also directly exposed to the outside, and are prone to loosening after being impacted and vibrated by seawater, which will further deteriorate the stability and sealing of the connection between the threaded male joint and the threaded female joint.

[0007] 3. The diameter of the casing joint is larger than that of the oil casing and directly protrudes from the outside of the oil casing. During drilling operations, friction will occur between the casing joint and the well wall, increasing the drilling torque and friction resistance. Long-term work will cause joint wear. Once the joint is severely worn, it will easily lead to unstable connection between the casings, which may easily cause the casing connection to disconnect, affecting normal work.

[0008] Therefore, a petroleum casing joint is proposed. Summary of the invention

[0009] The object of the present invention is to provide a petroleum casing joint, which can conveniently and accurately connect a threaded male joint to a threaded female joint by providing an annular outer tube and can avoid collision and wear of the threads during connection. Moreover, after the connection, the interface between the threaded male joint and the threaded female joint is sealed on the inner side of the annular outer tube to solve the problems raised in the above-mentioned background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A petroleum casing joint comprises a threaded male joint and a threaded female joint symmetrically connected at two ends of the casing, the threaded male joint and the threaded female joint are a pair of matching tapered threaded joints, an annular outer tube is rotatably mounted on the outer wall of the threaded male joint close to one end of the casing, and the threaded male joint is located inside the annular outer tube, a plurality of convex plates are fixedly mounted on the outer wall of the threaded female joint, a plurality of convex plate grooves corresponding to the convex plates are provided on the inner side wall of the annular outer tube, a plurality of connecting blocks are elastically connected to the bottom end of the annular outer tube, a plurality of connecting card grooves corresponding to the connecting card blocks are provided on the outer wall of the threaded male joint, a pushing mechanism for pushing one end of the connecting card block into the connecting card groove is installed on the annular outer tube, a lubrication assembly is provided in the threaded male joint, and the lubrication assembly is driven by the pushing mechanism and the connecting card block, a tensile assembly is provided between the threaded male joint and the threaded female joint, a wear-resistant rubber sleeve is sleeved on the outer side wall of the annular outer tube, a plurality of convex blocks are evenly provided on the outer side wall of the annular outer tube, and a plurality of grooves matching the convex blocks are evenly provided on the inner side wall of the wear-resistant rubber sleeve.

[0012] Before connecting the threaded male joint and the threaded female joint, one end of the annular outer tube is first sleeved onto the outer side of the threaded female joint and the convex plate is inserted into the corresponding convex plate groove. When the threaded male joint is rotated, the annular outer tube will move with it and approach the threaded female joint. After the threaded male joint is threadedly connected to the threaded female joint, the annular outer tube is tightly sleeved on the outer side of the threaded female joint, so it is convenient to quickly and accurately connect the threaded male joint to the threaded female joint, and it can avoid collision and wear of the threads during connection, thereby improving the stability and sealing of the connection between the threaded male joint and the threaded female joint. Moreover, after the connection, the interface between the threaded male joint and the threaded female joint is also sealed on the inner side of the annular outer tube, thereby further improving the sealing of the connection between the threaded male joint and the threaded female joint, and enhancing the sealing performance and use effect of the petroleum casing joint; after the threaded male joint is completely threadedly connected to the threaded female joint, the pushing mechanism is used to push one end of the connecting card block into the connecting card groove to fix the annular outer tube to the threaded male joint. The arrangement of the annular outer tube and the threaded male joint cannot rotate relative to the threaded female joint, thereby improving the stability of the connection between the threaded male joint and the threaded female joint, thereby improving the torsional strength of the oil casing joint; when the pipeline is inserted into the inner side of the oil casing and the oil casing joint, the lubricating component can lubricate the outer wall of the pipeline, thereby facilitating the stable connection of the pipeline to the oil casing and the oil casing joint, thereby improving the use effect of the oil casing joint; the tensile component can fix the threaded male joint and the threaded female joint together after the threaded male joint is completely threadedly connected to the threaded female joint, thereby preventing the threaded male joint and the threaded female joint from being damaged after being subjected to tension, thereby improving the tensile strength of the threaded male joint, the threaded female joint and the oil casing joint; the arrangement of the annular outer tube and the wear-resistant rubber sleeve can prevent the threaded male joint and the threaded female joint from being directly exposed to the outside of the oil casing, thereby improving the wear resistance of the oil casing joint, thereby improving the use effect and service life of the oil casing joint.

[0013] Preferably, the pushing mechanism includes an annular plug plate movably inserted at one end of the annular outer tube, and connecting blocks are evenly arranged at one end of the annular plug plate, and each of the connecting blocks is provided with a plug plate groove that cooperates with the annular plug plate on the outer side wall close to the annular plug plate, and the inner side wall of the plug plate groove is a slope, and an automatic connection component is provided between the annular plug plate and the annular outer tube.

[0014] Push the annular plug plate and insert one end of the annular plug plate into the corresponding plug plate groove on the connecting card block. After the annular plug plate squeezes the inclined surface of the plug plate groove, it will push one end of the connecting card block to insert into the connecting card groove on the threaded male joint, so that the annular outer tube can be fixedly connected to the threaded male joint. Due to the arrangement of the convex plate and the convex plate groove, the annular outer tube and the threaded male joint cannot rotate relative to the threaded female joint, thereby improving the stability of the connection between the threaded male joint and the threaded female joint, thereby improving the torsional strength of the petroleum casing joint.

[0015] Preferably, the automatic connection assembly includes two fixing plates installed on the end of the annular plug plate away from the annular outer tube, and two fixing blocks are installed on the end of the annular outer tube close to the annular plug plate. The outer side walls of one side of the two fixing plates are provided with connecting grooves that cooperate with the fixing blocks. The top ends of the two fixing blocks are elastically connected to the limiting blocks, and the inner side walls of the top ends of the two connecting grooves are provided with limiting grooves that match the limiting blocks.

[0016] After one end of the annular plug plate is fully inserted into the plug plate groove on the connecting block, the two fixing plates are just pressed against one end of the annular outer tube and the two fixing blocks are respectively inserted into the corresponding connecting grooves. The spring will push the top of the limit block to move into the corresponding limit groove due to the restoration of its own elastic force, so that the two fixing plates and the annular plug plate can be fixedly connected to the two fixing blocks and the annular outer tube. The annular plug plate can be automatically fixed to the annular outer tube by moving the annular plug plate, which is easy and quick to operate, thereby improving the convenience of using the automatic connection component, the pushing mechanism and the oil casing joint.

[0017] Preferably, the top walls of the two fixed plates are threadedly connected with threaded push rods that cooperate with the limit blocks, the outer walls of the top ends of the two threaded push rods are installed with limit rings, and the two fixed plates are provided with movable grooves that cooperate with the limit rings.

[0018] The fixing plate can be easily removed from the fixing block by turning the threaded push rod to squeeze the limit block downward and squeeze the limit block to the outside of the limit groove. Therefore, when the fixing plate is connected to the fixing block too early, the fixing plate can be easily removed from the fixing block, thereby avoiding the fixing plate and the fixing block being connected too early, resulting in the threaded male joint being unable to be fully threadedly connected to the threaded female joint, thereby improving the stability of the automatic connection component, the pushing mechanism and the oil casing joint.

[0019] Preferably, the lubrication assembly includes a plurality of oil storage boxes elastically connected to the inner wall of the threaded male joint, each of the oil storage boxes is fixedly mounted with a push rod, and one end of the push rod extends into the connecting slot, each of the oil storage boxes is provided with an oil outlet at one end away from the connecting slot, each of the oil storage boxes is elastically connected with a sealing ball that cooperates with the oil outlet, and one end of the sealing ball extends to the outside of the oil storage box.

[0020] After one end of the connecting card block is inserted into the connecting card slot, it will push the push rod and drive the push rod and the oil storage box to move to the side away from the connecting card block. At this time, one end of the oil storage box is flush with the inner wall of the threaded male joint and one end of the sealing ball protrudes to the inner side of the threaded male joint. When the pipeline is inserted into the inner side of the oil casing and the oil casing joint, the pipeline will squeeze the sealing ball and shrink the sealing ball into the oil storage box. At this time, the lubricating oil in the oil storage box will be discharged through the oil outlet and lubricate the outer wall of the pipeline, so as to facilitate the stable connection of the pipeline to the oil casing and the oil casing joint, thereby improving the use effect of the oil casing joint.

[0021] Preferably, the tensile assembly includes a plurality of mounting plates elastically mounted on the outer wall of the threaded female joint, and the mounting plates are all located at one end of the threaded female joint close to the sleeve, a plurality of inclined plates are mounted on each of the mounting plates, a plurality of mounting grooves are evenly arranged on the inner side wall of the annular outer tube, and a plurality of hook plates cooperating with the inclined plates are mounted on the inner side wall of each of the mounting grooves.

[0022] After the annular outer tube is sleeved onto the threaded female joint, it will move along the outer wall of the threaded female joint. When the annular outer tube approaches the threaded female joint, it will squeeze the inclined plate and push the inclined plate to shrink into the threaded female joint. When the threaded male joint is completely threadedly connected to the threaded female joint, the spring will push one end of the inclined plate to move into the installation groove and connect with the corresponding hook plate. Therefore, when the threaded male joint is away from the threaded female joint, the hook plate will hook the corresponding inclined plate and prevent the threaded male joint from being separated from the threaded female joint, thereby improving the tensile strength of the oil casing joint.

[0023] Preferably, an annular plug is installed on one end of the threaded male connector away from the sleeve, and an annular plug hole matching the annular plug is formed on the inner side wall of the threaded female connector.

[0024] After the threaded male joint is fully threaded onto the threaded female joint, the annular plug will be inserted into the corresponding annular plug hole. Therefore, when the threaded male joint and the threaded female joint are laterally thrust, the annular plug will prevent the threaded male joint and the threaded female joint from bending, thereby improving the bending strength of the threaded male joint, the threaded female joint and the stone casing joint.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. By setting the annular outer tube, the threaded male joint can be conveniently and accurately connected to the threaded female joint and the threaded male joint can be prevented from being damaged or worn during the connection. Moreover, after the connection, the interface between the threaded male joint and the threaded female joint is sealed on the inner side of the annular outer tube, thereby improving the sealing performance of the connection between the threaded male joint and the threaded female joint, and improving the sealing performance and use effect of the oil casing joint;

[0027] 2. After the threaded male joint is completely threadedly connected to the threaded female joint, the annular outer tube can be fixedly connected to the threaded male joint by using a pushing mechanism to push one end of the connecting block into the connecting slot. Due to the arrangement of the convex plate and the convex plate slot, the annular outer tube and the threaded male joint cannot rotate relative to the threaded female joint, thereby improving the stability of the connection between the threaded male joint and the threaded female joint, thereby improving the torsional strength of the oil casing joint;

[0028] 3. When the pipeline is inserted into the inner side of the oil casing and the oil casing joint, the lubrication assembly can lubricate the outer wall of the pipeline, thereby facilitating the stable connection of the pipeline to the oil casing and the oil casing joint, and improving the use effect of the oil casing joint;

[0029] 4. The tensile assembly can fix the threaded male joint and the threaded female joint together after the threaded male joint is fully threaded to the threaded female joint, thereby preventing the threaded male joint and the threaded female joint from being damaged by tension, thereby improving the tensile strength of the threaded male joint, the threaded female joint and the oil casing joint;

[0030] 5. The setting of the annular outer tube and the wear-resistant rubber sleeve can prevent the threaded male joint and the threaded female joint from being directly exposed to the outside of the oil casing, thereby improving the wear resistance of the oil casing joint, thereby improving the use effect and service life of the oil casing joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a front structural cross-sectional view of the threaded male connector and the threaded female connector of the present invention when they are not assembled;

[0033] Figure 3 It is a front structural cross-sectional view of the threaded male connector and the threaded female connector after being assembled according to the present invention;

[0034] Figure 4 It is a front structural cross-sectional view of the threaded male connector and the threaded female connector of the present invention when they are assembled and rotated 30 degrees;

[0035] Figure 5 It is a front structural schematic diagram of the threaded male connector and the threaded female connector after being assembled according to the present invention;

[0036] Figure 6 It is a left side view of the threaded male connector and the threaded female connector of the present invention after being assembled;

[0037] Figure 7 It is a right side view of the threaded male connector and the threaded female connector of the present invention after being assembled;

[0038] Figure 8 It is an enlarged view of the structure of part A of the present invention;

[0039] Fig. 9 It is an enlarged view of the structure of part B of the present invention; Fig.10 It is an enlarged view of the structure of part C of the present invention.

[0040] In the figure: 1, sleeve; 2, threaded male joint; 3, threaded female joint; 4, annular outer tube; 5, convex plate; 6, convex plate groove; 7, connecting card block; 8, connecting card groove; 9, annular plug plate; 10, plug plate groove; 11, fixing plate; 12, fixing block; 13, connecting groove; 14, limit block; 15, limit groove; 16, threaded push rod; 17, oil storage box; 18, push rod; 19, sealing ball; 20, mounting plate; 21, inclined plate; 22, mounting groove; 23, hook plate; 24, annular plug block; 25, annular socket; 26, wear-resistant rubber sleeve; 27, convex block. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] See also Figures 1 to 10 The present invention provides a petroleum casing joint, and the technical solution is as follows.

[0045] A petroleum casing joint, comprising a threaded male joint 2 and a threaded female joint 3 symmetrically connected at both ends of a casing 1, wherein the threaded male joint 2 and the threaded female joint 3 are a pair of matching tapered threaded joints, wherein an annular outer tube 4 is rotatably mounted on the outer wall of the threaded male joint 2 close to one end of the casing 1, and the threaded male joint 2 is located inside the annular outer tube 4, the annular outer tube 4 and the threaded male joint 2 can rotate relative to each other, and before installation, the annular outer tube 4 can prevent the threads of the threaded male joint 2 from being directly exposed to the outside and being worn, a plurality of convex plates 5 are fixedly mounted on the outer wall of the threaded female joint 3, a plurality of convex plate grooves 6 corresponding to the convex plates 5 are opened on the inner side wall of the annular outer tube 4, and the annular outer tube 4 is provided with a plurality of convex plate grooves 6 corresponding to the convex plates 5. The bottom end of the tube 4 is elastically connected with a plurality of connecting blocks 7, and a plurality of connecting slots 8 corresponding to the connecting blocks 7 are provided on the outer wall of the threaded male joint 2. A pushing mechanism for pushing one end of the connecting block 7 into the connecting slot 8 is installed on the annular outer tube 4. A lubrication assembly is provided in the threaded male joint 2, and the lubrication assembly is driven by the pushing mechanism and the connecting block 7. A tensile assembly is provided between the threaded male joint 2 and the threaded female joint 3. A wear-resistant rubber sleeve 26 is sleeved on the outer side wall of the annular outer tube 4, and a plurality of protrusions 27 are evenly provided on the outer side wall of the annular outer tube 4, and a plurality of grooves matching the protrusions 27 are evenly provided on the inner side wall of the wear-resistant rubber sleeve 26.

[0046] Before connecting the threaded male joint 2 and the threaded female joint 3, one end of the annular outer tube 4 is sleeved onto the outer side of the threaded female joint 3 and the convex plate 5 is inserted into the corresponding convex plate groove 6. When the threaded male joint 2 is rotated, the annular outer tube 4 will move with it and approach the threaded female joint 3. After the threaded male joint 2 is threadedly connected to the threaded female joint 3, the annular outer tube 4 is tightly sleeved on the outer side of the threaded female joint 3, so that it is convenient to quickly and accurately connect the threaded male joint 2 to the threaded female joint 3, and it can avoid collision and wear of the threads during connection, thereby improving the stability and sealing of the connection between the threaded male joint 2 and the threaded female joint 3. Moreover, after the connection, the interface between the threaded male joint 2 and the threaded female joint 3 is also sealed on the inner side of the annular outer tube 4, thereby further improving the sealing of the connection between the threaded male joint 2 and the threaded female joint 3, and enhancing the sealing performance and use effect of the petroleum casing joint; after the threaded male joint 2 is completely threadedly connected to the threaded female joint 3, the annular outer tube 4 can be fixedly connected to the threaded male joint 2 by using a pushing mechanism to push one end of the connecting block 7 into the connecting card groove 8. Due to the arrangement of the convex plate 5 and the convex plate groove 6, the annular outer tube 4 and the threaded male joint 2 cannot rotate relative to the threaded female joint 3, thereby improving the stability of the connection between the threaded male joint 2 and the threaded female joint 3, thereby improving the torsional strength of the oil casing joint; when the pipeline is inserted into the inner side of the oil casing and the oil casing joint, the lubricating component can lubricate the outer wall of the pipeline, thereby facilitating the stable connection of the pipeline to the oil casing and the oil casing joint, thereby improving the use effect of the oil casing joint; the tensile component can fix the threaded male joint 2 and the threaded female joint 3 together after the threaded male joint 2 is completely threadedly connected to the threaded female joint 3, thereby preventing the threaded male joint 2 and the threaded female joint 3 from being damaged after being subjected to tension, thereby improving the tensile strength of the threaded male joint 2, the threaded female joint 3 and the oil casing joint; the arrangement of the annular outer tube 4 and the wear-resistant rubber sleeve 26 can prevent the threaded male joint 2 and the threaded female joint 3 from being directly exposed to the outer side of the oil casing, thereby improving the wear resistance of the oil casing joint, thereby improving the use effect and service life of the oil casing joint.

[0047] As an embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 8 and Fig. 9 The pushing mechanism includes an annular plug plate 9 movably inserted at one end of the annular outer tube 4, and the connecting block 7 is evenly arranged at one end of the annular plug plate 9, a limiting slider is installed on the annular plug plate 9, and a limiting slide groove cooperating with the limiting slide is provided in the annular outer tube 4, so that the annular plug plate 9 can be prevented from falling off the annular outer tube 4, and an outer side wall of each connecting block 7 close to the annular plug plate 9 is provided with a plug plate groove 10 cooperating with the annular plug plate 9, and the inner side wall of the plug plate groove 10 is an inclined surface, and an automatic connection component is provided between the annular plug plate 9 and the annular outer tube 4.

[0048] Push the annular plug plate 9 and insert one end of the annular plug plate 9 into the corresponding plug plate groove 10 on the connecting block 7. After the annular plug plate 9 squeezes the inclined surface of the plug plate groove 10, it will push one end of the connecting block 7 to insert into the connecting groove 8 on the threaded male joint 2, so that the annular outer tube 4 can be fixedly connected to the threaded male joint 2. Due to the arrangement of the convex plate 5 and the convex plate groove 6, the annular outer tube 4 and the threaded male joint 2 cannot rotate relative to the threaded female joint 3, thereby improving the stability of the connection between the threaded male joint 2 and the threaded female joint 3, thereby improving the torsional strength of the oil casing joint.

[0049] As an embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 8 and Fig. 9 The automatic connection assembly includes two fixing plates 11 installed on the end of the annular plug plate 9 away from the annular outer tube 4, and two fixing blocks 12 are installed on the end of the annular outer tube 4 close to the annular plug plate 9. The outer side walls of the two fixing plates 11 are provided with connecting grooves 13 that cooperate with the fixing blocks 12. The top ends of the two fixing blocks 12 are elastically connected to the limiting blocks 14, and the inner side walls of the top ends of the two connecting grooves 13 are provided with limiting grooves 15 that match the limiting blocks 14.

[0050] After one end of the annular plug plate 9 is fully inserted into the plug plate groove 10 on the connecting block 7, the two fixing plates 11 are just tightly attached to one end of the annular outer tube 4 and the two fixing blocks 12 are respectively inserted into the corresponding connecting grooves 13. The spring will push the top of the limit block 14 to move into the corresponding limit groove 15 due to the restoration of its own elastic force, so that the two fixing plates 11 and the annular plug plate 9 can be fixedly connected to the two fixing blocks 12 and the annular outer tube 4. The annular plug plate 9 can be automatically fixed to the annular outer tube 4 by moving the annular plug plate 9. The operation is convenient and quick, thereby improving the convenience of using the automatic connection component, the pushing mechanism and the oil casing joint.

[0051] As an embodiment of the present invention, refer to Figure 8 and Fig. 9 The top walls of the two fixed plates 11 are threadedly connected with threaded push rods 16 that cooperate with the limit blocks 14, and the outer walls of the top ends of the two threaded push rods 16 are installed with limit rings. The two fixed plates 11 are provided with movable grooves that cooperate with the limit rings to prevent the threaded push rods 16 from falling off the fixed plates 11.

[0052] By rotating the threaded push rod 16 to squeeze the limit block 14 downward and squeeze the limit block 14 to the outside of the limit groove 15, the fixing plate 11 can be easily removed from the fixing block 12. Therefore, when the fixing plate 11 is connected to the fixing block 12 too early, the fixing plate 11 can be easily removed from the fixing block 12, thereby avoiding the fixing plate 11 and the fixing block 12 being connected too early, resulting in the threaded male joint 2 being unable to be completely threadedly connected to the threaded female joint 3, thereby improving the stability of the automatic connection component, the pushing mechanism and the oil casing joint.

[0053] As an embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 8 and Fig. 9 The lubrication assembly includes a plurality of oil storage boxes 17 elastically connected to the inner wall of the threaded male joint 2, each of the oil storage boxes 17 is fixedly mounted with a push rod 18, and one end of the push rod 18 extends into the connecting slot 8, and each of the oil storage boxes 17 is provided with an oil outlet at one end away from the connecting slot 8, and each of the oil storage boxes 17 is elastically connected with a sealing ball 19 that cooperates with the oil outlet, and one end of the sealing ball 19 extends to the outside of the oil storage box 17. In a natural state, the oil storage box 17 will shrink to the inner side of the threaded male joint 2 due to the tension of the spring, thereby preventing the oil storage box 17 from leaking oil after being bumped.

[0054] After one end of the connecting block 7 is inserted into the connecting slot 8, it will push the push rod 18 and drive the push rod 18 and the oil storage box 17 to move to the side away from the connecting block 7. At this time, one end of the oil storage box 17 is flush with the inner wall of the threaded male joint 2 and one end of the sealing ball 19 protrudes to the inner side of the threaded male joint 2. When the pipeline is inserted into the inner side of the oil casing and the oil casing joint, the pipeline will squeeze the sealing ball 19 and shrink the sealing ball 19 into the oil storage box 17. At this time, the lubricating oil in the oil storage box 17 will be discharged through the oil outlet and lubricated the outer wall of the pipeline, thereby facilitating the stable connection of the pipeline to the oil casing and the oil casing joint, thereby improving the use effect of the oil casing joint.

[0055] As an embodiment of the present invention, refer to Figure 4 and Fig.10 The tensile assembly includes a plurality of mounting plates 20 elastically mounted on the outer wall of the threaded female joint 3, and the mounting plates 20 are all located at one end of the threaded female joint 3 close to the sleeve 1, and a plurality of inclined plates 21 are mounted on each of the mounting plates 20. A plurality of mounting grooves 22 are evenly arranged on the inner side wall of the annular outer tube 4, and a plurality of hook plates 23 cooperating with the inclined plates 21 are mounted on the inner side wall of each of the mounting grooves 22.

[0056] After the annular outer tube 4 is sleeved onto the threaded female joint 3, it will move along the outer wall of the threaded female joint 3. When the annular outer tube 4 approaches the threaded female joint 3, the annular outer tube 4 will squeeze the inclined plate 21 and push the inclined plate 21 to shrink into the threaded female joint 3. When the threaded male joint 2 is completely threadedly connected to the threaded female joint 3, the spring will push one end of the inclined plate 21 to move into the installation groove 22 and connect with the corresponding hook plate 23. Therefore, when the threaded male joint 2 is away from the threaded female joint 3, the hook plate 23 will hook the corresponding inclined plate 21 and prevent the threaded male joint 2 from being separated from the threaded female joint 3, thereby improving the tensile strength of the oil casing joint.

[0057] As an embodiment of the present invention, refer to Figure 2 and Figure 3 An annular plug block 24 is installed at one end of the threaded male connector 2 away from the sleeve 1, and an annular plug hole 25 matching the annular plug block 24 is opened on the inner side wall of the threaded female connector 3.

[0058] After the threaded male connector 2 is fully threadedly connected to the threaded female connector 3, the annular plug 24 will be inserted into the corresponding annular plug hole 25. Therefore, when the threaded male connector 2 and the threaded female connector 3 are laterally thrust, the annular plug 24 will prevent the threaded male connector 2 and the threaded female connector 3 from bending, thereby improving the bending strength of the threaded male connector 2, the threaded female connector 3 and the stone casing connector.

[0059] Working principle: before connecting the threaded male connector 2 and the threaded female connector 3, first sleeve one end of the annular outer tube 4 onto the outside of the threaded female connector 3 and insert the convex plate 5 into the corresponding convex plate groove 6. When the threaded male connector 2 is rotated, the annular outer tube 4 will follow and move closer to the threaded female connector 3. After the threaded male connector 2 is threadedly connected to the threaded female connector 3, the annular outer tube 4 is tightly sleeved on the outside of the threaded female connector 3. After the threaded male connector 2 is completely threadedly connected to the threaded female connector 3, use the pushing annular plug plate 9 and insert one end of the annular plug plate 9 into the corresponding plug plate groove 10 on the connecting card block 7. After the annular plug plate 9 squeezes the inclined surface of the plug plate groove 10, it will push one end of the connecting card block 7 into the connecting card groove 8 on the threaded male connector 2. The annular outer tube 4 can be fixedly connected to the threaded male joint 2. Due to the arrangement of the convex plate 5 and the convex plate groove 6, the annular outer tube 4 and the threaded male joint 2 cannot rotate relative to the threaded female joint 3. After one end of the annular plug plate 9 is fully inserted into the plug plate groove 10 on the connecting block 7, the two fixing plates 11 are just tightly attached to one end of the annular outer tube 4 and the two fixing blocks 12 are respectively inserted into the corresponding connecting grooves 13. The spring will push the top of the limit block 14 to move to the corresponding limit groove 15 due to the restoration of its own elastic force, so that the two fixing plates 11 and the annular plug plate 9 can be fixedly connected to the two fixing blocks 12 and the annular outer tube 4. Moving the annular plug plate 9 can automatically fix the annular plug plate 9 to the annular On the outer tube 4; after one end of the connecting block 7 is inserted into the connecting slot 8, it will push the push rod 18 and drive the push rod 18 and the oil storage box 17 to move to the side away from the connecting block 7. At this time, one end of the oil storage box 17 is flush with the inner side wall of the threaded male joint 2 and one end of the sealing ball 19 protrudes to the inner side of the threaded male joint 2. When the pipeline is inserted into the inner side of the oil casing and the oil casing joint, the pipeline will squeeze the sealing ball 19 and shrink the sealing ball 19 into the oil storage box 17. At this time, the lubricating oil in the oil storage box 17 will be discharged through the oil outlet and lubricate the outer wall of the pipeline, so as to facilitate the stable connection of the pipeline to the oil casing and the oil casing joint; after the annular outer tube 4 is sleeved on the threaded female joint 3, it will move along the outer wall of the threaded female joint 3 When the annular outer tube 4 approaches the threaded female joint 3, the annular outer tube 4 will squeeze the inclined plate 21 and push the inclined plate 21 to shrink into the threaded female joint 3. When the threaded male joint 2 is completely threadedly connected to the threaded female joint 3, the spring will push one end of the inclined plate 21 to move into the installation groove 22 and connect with the corresponding hook plate 23. Therefore, when the threaded male joint 2 is away from the threaded female joint 3, the hook plate 23 will hook the corresponding inclined plate 21 and prevent the threaded male joint 2 from being separated from the threaded female joint 3, thereby improving the tensile strength of the oil casing joint; the setting of the annular outer tube 4 and the wear-resistant rubber sleeve 26 can prevent the threaded male joint 2 and the threaded female joint 3 from being directly exposed to the outside of the oil casing, thereby improving the wear resistance of the oil casing joint.

[0060] The electrical components appearing in this article are all connected to the external main controller and 220V AC power through a transformer, and the main controller can be a conventional known device that controls a computer, etc. The product model provided by the present invention is only used for the technical solution according to the structural characteristics of the product. The product will be adjusted and modified after purchase to make it more matching and consistent with the technical solution of the present invention. It is a technical solution for the best application of the technical solution. The model of its product can be replaced and modified according to the required technical parameters, which is well known to technical personnel in this field. Therefore, technical personnel in this field can clearly obtain the corresponding use effect through the technical solution provided by the present invention.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A petroleum casing joint, comprising a threaded male joint (2) and a threaded female joint (3) symmetrically connected to both ends of a casing (1), wherein the threaded male joint (2) and the threaded female joint (3) are a pair of matching tapered threaded joints, characterized in that: An annular outer tube (4) is rotatably mounted on the outer wall of the threaded male joint (2) close to one end of the sleeve (1), and the threaded male joint (2) is located inside the annular outer tube (4). A plurality of convex plates (5) are fixedly mounted on the outer wall of the threaded female joint (3). A plurality of convex plate grooves (6) corresponding to the convex plates (5) are provided on the inner side wall of the annular outer tube (4). A plurality of connecting blocks (7) are elastically connected to the bottom end of the annular outer tube (4). A plurality of connecting grooves (8) corresponding to the connecting blocks (7) are provided on the outer wall of the threaded male joint (2). A pushing mechanism for pushing one end of the connecting block (7) into the connecting groove (8) is installed on the annular outer tube (4); the pushing mechanism comprises an annular plug plate (9) movably inserted at one end of the annular outer tube (4), and the connecting blocks (7) are evenly arranged. At one end of the annular plug plate (9), each of the connecting blocks (7) is provided with a plug plate groove (10) on the outer side wall close to the annular plug plate (9), and the inner side wall of the plug plate groove (10) is an inclined surface. An automatic connection component is provided between the annular plug plate (9) and the annular outer tube (4). A lubrication component is provided inside the threaded male joint (2), and the lubrication component is driven by a pushing mechanism and the connecting block (7). A tension-resistant component is provided between the threaded male joint (2) and the threaded female joint (3). A wear-resistant rubber sleeve (26) is sleeved on the outer side wall of the annular outer tube (4). A plurality of protrusions (27) are evenly provided on the outer side wall of the annular outer tube (4). A plurality of grooves matching the protrusions (27) are evenly provided on the inner side wall of the wear-resistant rubber sleeve (26).

2. The petroleum casing joint according to claim 1, characterized in that: The automatic connection assembly comprises two fixing plates (11) installed at one end of the annular plug plate (9) away from the annular outer tube (4); two fixing blocks (12) are installed at one end of the annular outer tube (4) close to the annular plug plate (9); connecting grooves (13) cooperating with the fixing blocks (12) are provided on the outer side walls of one side of the two fixing plates (11); the top ends of the two fixing blocks (12) are elastically connected to limit blocks (14); and the inner side walls of the top ends of the two connecting grooves (13) are provided with limit grooves (15) cooperating with the limit blocks (14).

3. The petroleum casing joint according to claim 2, characterized in that: The top walls of the two fixing plates (11) are both threadedly connected with threaded push rods (16) that cooperate with the limit blocks (14), and the outer walls at the top ends of the two threaded push rods (16) are both installed with limit rings. The two fixing plates (11) are both provided with movable grooves that cooperate with the limit rings.

4. The petroleum casing joint according to claim 1, characterized in that: The lubrication assembly comprises a plurality of oil storage boxes (17) elastically connected to the inner side wall of the threaded male joint (2), each of the oil storage boxes (17) being fixedly mounted with a push rod (18), and one end of the push rod (18) extending into the connecting slot (8), and each of the oil storage boxes (17) being provided with an oil outlet at one end away from the connecting slot (8), and each of the oil storage boxes (17) being elastically connected with a sealing ball (19) cooperating with the oil outlet, and one end of the sealing ball (19) extending to the outside of the oil storage box (17).

5. The petroleum casing joint according to claim 1, characterized in that: The tensile assembly comprises a plurality of mounting plates (20) elastically mounted on the outer wall of the threaded female joint (3), and the mounting plates (20) are all located at one end of the threaded female joint (3) close to the sleeve (1), and a plurality of inclined plates (21) are mounted on each of the mounting plates (20). A plurality of mounting grooves (22) are evenly arranged on the inner wall of the annular outer tube (4), and a plurality of hook plates (23) cooperating with the inclined plates (21) are mounted on the inner wall of each of the mounting grooves (22).

6. The petroleum casing joint according to claim 1, characterized in that: An annular plug block (24) is installed at one end of the threaded male joint (2) close to the sleeve (1), and an annular plug hole (25) matching the annular plug block (24) is provided on the inner side wall of the threaded female joint (3).

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