Casing pup joint and casing head plugging structure

Abstract

The invention discloses a casing pup joint and casing head plugging structure which comprises a casing head body and a surface casing, the outer wall of the surface casing is fixedly connected with the inner wall of the casing head body, and the invention relates to the technical field of plugging devices. According to the casing pup joint and casing head plugging structure, through the arrangement of the connecting clamping plate, a gap between the main surrounding clamp and the auxiliary surrounding clamp can be shielded, a grease injection groove can be better filled with a polytetrafluoro sealing material, the connecting clamping plate is tightly attached to the inner wall of the grease injection groove, and the sealing effect is improved. According to the sealing device for the polyethylene teflon sealing material, the clamping rod is arranged between the main embracing clamp and the auxiliary embracing clamp, so that a gap at the joint of the main embracing clamp and the auxiliary embracing clamp is sealed, the phenomenon that the polyethylene teflon sealing material flows out of the gap at the joint of the main embracing clamp and the auxiliary embracing clamp when the polyethylene teflon sealing material is injected is avoided, the sealing effect on the polyethylene teflon sealing material is correspondingly improved, and the arc-shaped plate and the U-shaped plate are limited through the clamping rod; the clamping connection stability between the main surrounding clamp and the auxiliary surrounding clamp can be enhanced through the operation.

Description

Technical Field

[0001] The invention relates to the technical field of plugging devices, in particular to a casing short-circuit and casing head plugging structure. Background Art

[0002] Casing head: used to fix the wellhead of the well, connect the wellhead casing string, support the gravity of the technical casing and the oil layer casing, seal the annular space between the layers of pipes, provide a transition connection for the installation of the blowout preventer, tubing head, and Christmas tree, and through the two side ports on the casing head body, it can be used for mud squeezing, monitoring, and filling balance fluid. The casing head is generally made of 35 or 42 chromium-molybdenum high-quality alloy structural steel; a casing hanger is also set in the casing head to hang the casing string of corresponding specifications and seal it. The annular space gap, the existing casing short-circuit and casing head sealing structure, is achieved by fixing the casing head body and the surface casing with an annular clamp, and then injecting polytetrafluoroethylene sealing material into the first grease injection groove and the second grease injection groove under high pressure through the first grease injection tube and the second grease injection tube. After the grease injection operation is completed, the first grease injection tube and the second grease injection tube are sealed by the plug, thereby conveniently realizing the sealing and plugging of the surface casing and the casing head body, thereby effectively improving the sealing between the surface casing and the casing head body.

[0003] In the prior art, when sealing the sleeve short-circuit and the sleeve head, it is not convenient to inject the polytetrafluoroethylene sealing material into the interior due to the small gap between the sleeve short-circuit and the sleeve head, which makes the sealing between the sleeve short-circuit and the sleeve head inconvenient. Moreover, the polytetrafluoroethylene sealing material just injected is liquid and has not been fixed yet, so it is easy to flow out from the gap at the connection of the ring clamp, thereby affecting the effect of injecting the polytetrafluoroethylene sealing material. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a casing short-circuit and casing head plugging structure, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a casing short-circuit and casing head plugging structure, including a casing head body and a surface casing, the outer wall of the surface casing is fixedly connected to the inner wall of the casing head body, the outer wall of the surface casing is fixedly connected to an annular plate, the outer wall of the surface casing is movably connected to a main ring-embracing clamp and a secondary ring-embracing clamp, the top and bottom of the main ring-embracing clamp and the secondary ring-embracing clamp are both provided with grease injection grooves, and the interior of the secondary ring-embracing clamp is slidably connected to a connecting card plate, the surface of the connecting card plate is fixedly connected to A fixing rod is connected, one end of the fixing rod passes through the secondary surrounding card and extends to the outside of the secondary surrounding card, the end of the fixing rod extending to the outside of the secondary surrounding card is fixedly connected to a vertical plate, and one side of the vertical plate is fixedly connected to an arc plate, the surface of the main surrounding card is fixedly connected to a U-shaped plate, one side of the arc plate passes through the U-shaped plate and extends to one side of the U-shaped plate, the surface of the main surrounding card is provided with a movable plate, and the back of the movable plate is fixedly connected to a clamping rod, one end of the clamping rod passes through the U-shaped plate and the arc plate and extends to the outside of the arc plate.

[0006] Preferably, there are two annular plates, and the inner walls of the main annular clamp and the auxiliary annular clamp are both provided with annular grooves that are compatible with the annular plates.

[0007] Preferably, there are two connecting clamps, and the cross-section of the connecting clamp is U-shaped, and the size thereof is adapted to the grease injection groove.

[0008] Preferably, U-shaped plates are provided at the front and rear of the main ring embracing card, and the number of U-shaped plates is set to six, and the U-shaped plates and the arc-shaped plates are both provided with card holes that are compatible with the card rods.

[0009] Preferably, the top and bottom of the front and rear surfaces of the secondary ring-embracing card are provided with arc grooves adapted to the fixing rod, and the length of the connecting card plate is twice the length of the arc groove, and the top and bottom of the surface of the main ring-embracing card are connected to grease injection tubes.

[0010] Preferably, the surfaces of the main encircling card and the auxiliary encircling card are fixedly connected with circular plates, and the inside of the circular plates is fixedly connected with connecting rods, and the top and bottom of the surfaces of the connecting rods are sleeved with arc-shaped movable plates.

[0011] Preferably, the two arc-shaped movable plates are fixedly connected to the opposite sides with positioning rods, both ends of the connecting rod pass through the arc-shaped movable plate and the positioning rod and extend to the inside of the positioning rod, a first spring is fixedly connected to the surface of the connecting rod and is located between the circular plate and the side opposite to the arc-shaped movable plate, one end of the positioning rod passes through the sleeve head body and extends to the inside of the sleeve head body, and a positioning hole matching the positioning rod is opened on the surface of the sleeve head body.

[0012] Preferably, the surface of the main ring-embracing card is fixedly connected to a shell, and the surface of the shell is movably connected to a movable rod, and one end of the movable rod is fixedly connected to the back side of the movable plate.

[0013] Preferably, one end of the movable rod extending into the interior of the shell is fixedly connected to a stopper, and a second spring is fixedly connected to the surface of the movable rod and located between the side opposite to the stopper and the inner wall of the shell. There are four shells, and two are respectively provided at the front and rear of the main ring embracing card.

[0014] The present invention provides a casing short-circuit and casing head plugging structure. Compared with the prior art, the casing short-circuit and casing head plugging structure has the following beneficial effects: the casing short-circuit and casing head plugging structure is fixedly connected with an annular plate through the outer wall of the surface casing, and the outer wall of the surface casing is movably connected with a main ring clamp and a secondary ring clamp respectively, and the top and bottom of the main ring clamp and the secondary ring clamp are provided with grease injection grooves, and the inside of the secondary ring clamp is slidably connected with a connecting card plate, and the surface of the connecting card plate is fixedly connected with a fixing rod, one end of the fixing rod passes through the secondary ring clamp and extends to the outside of the secondary ring clamp, and the fixing rod One end extending to the outside of the secondary surround card is fixedly connected to a vertical plate, and one side of the vertical plate is fixedly connected to an arc plate, the surface of the main surround card is fixedly connected to a U-shaped plate, one side of the arc plate penetrates the U-shaped plate and extends to one side of the U-shaped plate, a movable plate is arranged on the surface of the main surround card, and a clamping rod is fixedly connected to the back of the movable plate, one end of the clamping rod penetrates the U-shaped plate and the arc plate and extends to the outside of the arc plate, and the setting of the connecting clamping plate can block the gap between the main surround card and the secondary surround card. It helps the PTFE sealing material to better fill the grease injection groove, so that the connecting card plate and the inner wall of the grease injection groove are closely attached, thereby sealing the gap at the connection between the main ring card and the auxiliary ring card, avoiding the flow of the PTFE sealing material due to the gap at the connection between the main ring card and the auxiliary ring card when the PTFE sealing material is injected, and correspondingly increasing the sealing effect of the PTFE sealing material. When the connecting card plate moves, the vertical plate will drive the arc plate to move into the interior of the U-shaped plate, and the arc plate and the U-shaped plate are connected by the card rod. The limiting operation is performed between the templates, which will enhance the stability of the clamping connection between the main ring-embracing clamp and the auxiliary ring-embracing clamp. The positioning rods on the two ring-embracing clamps are arranged to conveniently realize the fixation of the ring-embracing clamp and the casing head body and the surface casing. Grease is injected into the inside of the ring-embracing clamp through the grease injection tube. After the grease injection operation is completed, the grease injection tube is sealed through the plug, thereby conveniently realizing the sealing of the surface casing and the casing head body, thereby effectively improving the sealing between the surface casing and the casing head body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of the structure of the present invention;

[0016] Figure 2It is a structural schematic diagram of the connection between the U-shaped plate and the curved plate of the present invention;

[0017] Figure 3 It is a three-dimensional diagram of the surface casing structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the connection state structure of the Hug Card of the present invention;

[0019] Figure 5 A three-dimensional diagram of the connecting card structure of the present invention;

[0020] Figure 6 It is a side view of the encircling card structure of the present invention;

[0021] Figure 7 It is an internal diagram of the main ring hugging card structure of the present invention;

[0022] Figure 8 For the present invention Figure 2 A partial enlarged view of the middle A;

[0023] Fig. 9 For the present invention Figure 6 A partial enlarged view of point B in the middle;

[0024] Fig.10 For the present invention Figure 6 A partial enlarged view of point C in the middle.

[0025] In the figure: 1-casing head body, 2-surface casing, 3-annular plate, 4-main annular clamp, 5-secondary annular clamp, 6-grease injection groove, 7-connecting clamp plate, 8-fixed rod, 9-vertical plate, 10-arc plate, 11-U-shaped plate, 12-movable plate, 13-clamp rod, 14-annular groove, 15-clamp hole, 16-arc groove, 17-circular plate, 18-connecting rod, 19-arc movable plate, 20-positioning rod, 21-first spring, 22-positioning hole, 23-housing, 24-movable rod, 25-block, 26-second spring, 27-grease injection tube. DETAILED DESCRIPTION

[0026] 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.

[0027] See also Figure 1-10The present invention provides a technical solution: a casing short-circuit and casing head plugging structure, comprising a casing head body 1 and a surface casing 2, the outer wall of the surface casing 2 is fixedly connected to the inner wall of the casing head body 1, the outer wall of the surface casing 2 is fixedly connected with an annular plate 3, the outer wall of the surface casing 2 is movably connected with a main ring-embracing clamp 4 and a secondary ring-embracing clamp 5, the top and bottom of the main ring-embracing clamp 4 and the secondary ring-embracing clamp 5 are both provided with a grease injection groove 6, and the inside of the secondary ring-embracing clamp 5 is slidably connected with a connecting card plate 7, the surface of the connecting card plate 7 is fixedly connected with a fixing rod 8, and one side of the fixing rod 8 The end of the main ring-embracing card 4 passes through the secondary ring-embracing card 5 and extends to the outside of the secondary ring-embracing card 5. The end of the fixed rod 8 extending to the outside of the secondary ring-embracing card 5 is fixedly connected to a vertical plate 9, and one side of the vertical plate 9 is fixedly connected to an arc plate 10. The surface of the main ring-embracing card 4 is fixedly connected to a U-shaped plate 11, and one side of the arc plate 10 passes through the U-shaped plate 11 and extends to one side of the U-shaped plate 11. A movable plate 12 is provided on the surface of the main ring-embracing card 4, and a clamping rod 13 is fixedly connected to the back of the movable plate 12, and one end of the clamping rod 13 passes through the U-shaped plate 11 and the arc plate 10 and extends to the outside of the arc plate 10.

[0028] Specifically, the setting of the connecting card plate 7 can cover the gap between the main ring-embracing card 4 and the auxiliary ring-embracing card 5, which helps the polytetrafluoroethylene sealing material to better fill the grease injection groove 6, and makes the connecting card plate 7 and the inner wall of the grease injection groove 6 tightly fit, thereby sealing the gap at the connection between the main ring-embracing card 4 and the auxiliary ring-embracing card 5, avoiding the polytetrafluoroethylene sealing material from flowing out due to the gap at the connection between the main ring-embracing card 4 and the auxiliary ring-embracing card 5 when injecting, thereby correspondingly increasing the sealing effect of the polytetrafluoroethylene sealing material.

[0029] In the present invention, the number of the annular plates 3 is set to two, and the inner walls of the main annular clamp 4 and the auxiliary annular clamp 5 are both provided with annular grooves 14 adapted to the annular plates 3.

[0030] In the present invention, two connecting clamps 7 are provided, and the cross section of the connecting clamps 7 is U-shaped, and the size thereof is adapted to the grease injection groove 6 .

[0031] In the present invention, U-shaped plates 11 are arranged at the front and rear of the main ring embracing card 4, and the number of the U-shaped plates 11 is set to six, and the U-shaped plates 11 and the arc-shaped plates 10 are both provided with card holes 15 adapted to the card rod 13.

[0032] Specifically, by setting the main ring-embracing card 4 and the secondary ring-embracing card 5, when the main ring-embracing card 4 and the secondary ring-embracing card 5 are in contact with the outer wall of the surface casing 2, it is convenient to achieve the sealing of the surface casing 2.

[0033] In the present invention, the top and bottom of the front and rear surfaces of the secondary encircling card 5 are provided with arc grooves 16 adapted to the fixing rod 8, and the length of the connecting card plate 7 is twice the length of the arc groove 16, and the top and bottom of the surface of the main encircling card 4 are connected with grease injection tubes 27.

[0034] Specifically, by providing a grease injection tube 27 and a grease injection groove 6, a high-pressure grease injection method is adopted, and the grease injection tube 27 is used to facilitate the injection of polytetrafluoroethylene sealing material into the grease injection groove 6. The polytetrafluoroethylene sealing material injected with high pressure improves the sealing between the main ring-embracing clamp 4 and the auxiliary ring-embracing clamp 5 and the surface casing 2, thereby achieving the sealing between the casing head body 1 and the surface casing 2.

[0035] In the present invention, the surfaces of the main encircling card 4 and the secondary encircling card 5 are fixedly connected with a circular plate 17, and the inside of the circular plate 17 is fixedly connected with a connecting rod 18, and the top and bottom of the surface of the connecting rod 18 are sleeved with an arc-shaped movable plate 19.

[0036] In the present invention, the two arc-shaped movable plates 19 are fixedly connected to the opposite sides thereof with a positioning rod 20, both ends of the connecting rod 18 penetrate the arc-shaped movable plate 19 and the positioning rod 20 and extend to the inside of the positioning rod 20, a first spring 21 is fixedly connected to the surface of the connecting rod 18 and is located between the circular plate 17 and the side opposite to the arc-shaped movable plate 19, one end of the positioning rod 20 penetrates the casing head body 1 and extends to the inside of the casing head body 1, and a positioning hole 22 matching the positioning rod 20 is provided on the surface of the casing head body 1.

[0037] In the present invention, the surface of the main ring embracing card 4 is fixedly connected with a shell 23, and the surface of the shell 23 is movably connected with a movable rod 24, and one end of the movable rod 24 is fixedly connected to the back side of the movable plate 12.

[0038] In the present invention, one end of the movable rod 24 extending to the inside of the shell 23 is fixedly connected to a stopper 25, and a second spring 26 is fixedly connected to the surface of the movable rod 24 and located between the stopper 25 and the side opposite to the inner wall of the shell 23. There are four shells 23, and two are respectively provided at the front and rear of the main ring embracing card 4.

[0039] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0040] When in use, the annular grooves 14 on the main and secondary annular clamps 4 and 5 are aligned with the annular plates 3 on the surface of the surface casing 2, so that the main and secondary annular clamps 4 and 5 can be simply fixed. When the main and secondary annular clamps 4 and 5 are tightly fitted, the arc-shaped movable plate 19 on the connecting rod 18 can be loosened. Under the elastic effect of the first spring 21, the positioning rod 20 on the arc-shaped movable plate 19 is inserted into the positioning hole 22 on the casing head body 1, completing the fixation between the main and secondary annular clamps 4 and 5 and the casing head body 1 and the surface casing 2. Then, the vertical plate 9 is pushed to push the vertical plate 9 to the side close to the main annular clamp 4. The movement of the vertical plate 9 will drive the fixing rod 8 to move inside the arc groove 16, and the fixing rod 8 drives the connecting card plate 7 from the secondary annular clamp 5 moves from the grease injection groove 6 in the main ring hugging card 4 to the grease injection groove 6 in the main ring hugging card 4, and the gap at the connection between the main ring hugging card 4 and the secondary ring hugging card 5 is blocked. When the vertical plate 9 moves, the arc plate 10 will be driven to move inside the U-shaped plate 11, and then the movable plate 12 is released. Under the elastic force of the second spring 26, the clamping rod 13 will be driven to insert into the arc plate 10 to complete the limit between the arc plate 10 and the U-shaped plate 11, and the polytetrafluoroethylene sealing material will be injected through the grease injection tube 27. The polytetrafluoroethylene sealing material will enter the interior of the grease injection groove 61 from the grease injection tube 27, thereby tightly sealing the casing head body 1 and the surface casing 2, avoiding the occurrence of a gap between the casing head body 1 and the surface casing 2, and correspondingly increasing the sealing between the casing head body 1 and the surface casing 2.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] 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 casing short-circuit and casing head plugging structure, comprising a casing head body (1) and a surface casing (2), characterized in that: The outer wall of the surface sleeve (2) is fixedly connected to the inner wall of the sleeve head body (1); the outer wall of the surface sleeve (2) is fixedly connected to a ring plate (3); the outer wall of the surface sleeve (2) is movably connected to a main ring clamp (4) and a secondary ring clamp (5); the top and bottom of the main ring clamp (4) and the secondary ring clamp (5) are both provided with a grease injection groove (6); the inside of the secondary ring clamp (5) is slidably connected to a connecting clamp plate (7); the surface of the connecting clamp plate (7) is fixedly connected to a fixing rod (8); one end of the fixing rod (8) passes through the secondary ring clamp (5) and extends to the outside of the secondary ring clamp (5). The fixed rod (8) is fixedly connected to one end of the external side of the secondary encircling clamp (5) with a vertical plate (9), and one side of the vertical plate (9) is fixedly connected to an arc plate (10); the surface of the primary encircling clamp (4) is fixedly connected to a U-shaped plate (11), and one side of the arc plate (10) penetrates the U-shaped plate (11) and extends to one side of the U-shaped plate (11); the surface of the primary encircling clamp (4) is provided with a movable plate (12), and the back side of the movable plate (12) is fixedly connected to a clamping rod (13), and one end of the clamping rod (13) penetrates the U-shaped plate (11) and the arc plate (10) and extends to the outside of the arc plate (10).

2. A casing short-circuit and casing head plugging structure according to claim 1, characterized in that: The number of the annular plates (3) is two, and the inner walls of the main encircling clamp (4) and the auxiliary encircling clamp (5) are both provided with annular grooves (14) adapted to the annular plates (3).

3. The casing short-circuit and casing head plugging structure according to claim 1, characterized in that: The number of the connecting clamping plates (7) is two, and the cross-section of the connecting clamping plates (7) is U-shaped, and the size thereof is adapted to the grease injection groove (6).

4. The casing short-circuit and casing head plugging structure according to claim 1, characterized in that: The main encircling clamp (4) is provided with U-shaped plates (11) at the front and rear, and the number of the U-shaped plates (11) is six. The U-shaped plates (11) and the arc-shaped plates (10) are provided with clamping holes (15) that are compatible with the clamping rod (13).

5. The casing short-circuit and casing head plugging structure according to claim 1, characterized in that: The top and bottom of the front and rear surfaces of the secondary encircling clamp (5) are both provided with arc grooves (16) adapted to the fixing rod (8), and the length of the connecting clamp plate (7) is twice the length of the arc groove (16). The top and bottom of the surface of the primary encircling clamp (4) are both connected with grease injection pipes (27).

6. The casing short-circuit and casing head plugging structure according to claim 1, characterized in that: The surfaces of the main encircling card (4) and the auxiliary encircling card (5) are both fixedly connected with a circular plate (17), and the inside of the circular plate (17) is fixedly connected with a connecting rod (18), and the top and bottom of the surface of the connecting rod (18) are both sleeved with an arc-shaped movable plate (19).

7. The casing short-circuit and casing head plugging structure according to claim 6, characterized in that: The two arc-shaped movable plates (19) are fixedly connected to the opposite sides thereof with a positioning rod (20); both ends of the connecting rod (18) penetrate the arc-shaped movable plate (19) and the positioning rod (20) and extend to the inside of the positioning rod (20); a first spring (21) is fixedly connected to the surface of the connecting rod (18) and is located between the circular plate (17) and the arc-shaped movable plate (19) on the opposite side; one end of the positioning rod (20) penetrates the casing head body (1) and extends to the inside of the casing head body (1); a positioning hole (22) adapted to the positioning rod (20) is provided on the surface of the casing head body (1).

8. The casing short-circuit and casing head plugging structure according to claim 1, characterized in that: The surface of the main ring-embracing card (4) is fixedly connected to a shell (23), and the surface of the shell (23) is movably connected to a movable rod (24), one end of which is fixedly connected to the back side of the movable plate (12).

9. A casing short-circuit and casing head plugging structure according to claim 8, characterized in that: One end of the movable rod (24) extending into the interior of the housing (23) is fixedly connected to a stopper (25); a second spring (26) is fixedly connected to the surface of the movable rod (24) and located between the stopper (25) and the inner wall of the housing (23) on a side opposite to the inner wall; the housing (23) is provided with four springs, and two springs are provided at the front and rear of the main ring embracing card (4), respectively.

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