A wellhead sealing device and method

Abstract

The application relates to the technical field of oil well sealing devices, and particularly discloses a wellhead sealing device and method, wherein the wellhead sealing device comprises a mounting part and a sealing part; the mounting part is arranged on a wellhead and is provided with a first through hole and a second through hole along the axial direction of the wellhead, one end of the second through hole faces the first through hole and communicates with the first through hole; the sealing part is movably arranged in the second through hole; when the sealing part is inserted into the first through hole, the end face of the one end of the sealing part inserted into the first through hole abuts against an oil pipe and is arranged around the outer periphery of the oil pipe, and the one end of the sealing part inserted into the first through hole is arranged between the oil pipe and the gap of the first through hole. While the conversion flange and the hoisting operation are removed, the sealing and unsealing are ensured to be smoothly performed, the operation process is simplified, the operation difficulty is reduced, the operation construction under the condition of hoisting heavy objects is avoided, and the operation safety is improved. When subsequent leakage occurs, secondary extrusion can be performed, so that the sealing is performed again, and the stability of the sealing is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil well sealing devices, in particular to a wellhead sealing device and method. BACKGROUND

[0002] Oil fields carry out downhole electric heating technology, through the downhole electric heater, the steam flowing through the surface of the electric heater is injected into the production layer after heating, thereby improving the steam dryness. Among them, the sealing device arranged at the wellhead is one of the important components of the entire electric heating technology.

[0003] The existing sealing device of the wellhead is generally in the structure form of the pressure cap compression, when the tubing is down, the wellhead auxiliary sealing can be realized by tightening the pressure cap. However, the sealing device with the structure form of the pressure cap compression needs to be disassembled and lifted to a certain height after the tubing is down, so as to tighten the pressure cap, which causes the safety risk in the operation process, and the sealing effect of the sealing device with the structure form of the pressure cap compression is easily affected by the compression degree, equipment material and assembly method, which causes poor stability of the sealing. And the existing sealing device is generally constructed by one operation, when the sealing element is worn and causes leakage and other problems, the sealing element needs to be replaced again, so that the sealing life is unstable.

[0004] Therefore, the application effect of the existing sealing device of the wellhead is poor. SUMMARY

[0005] In view of the above problems, the present application provides a wellhead sealing device and method, wherein a wellhead sealing device comprises:

[0006] A mounting portion is arranged on the wellhead, and a first through hole for the tubing to pass through is formed on the mounting portion along the axial direction of the wellhead;

[0007] A second through hole is also formed on the mounting portion, one end of the second through hole faces the first through hole and communicates with the first through hole;

[0008] A sealing portion is movably arranged in the second through hole, and the sealing portion can move towards the first through hole;

[0009] When one end of the sealing portion close to the first through hole is inserted into the first through hole, the end face of the one end of the sealing portion inserted into the first through hole abuts against the tubing and is arranged around the outer periphery of the tubing, and the one end of the sealing portion inserted into the first through hole is arranged between the tubing and the first through hole.

[0010] In some embodiments, the second through hole is two, and the two second through holes are symmetrically arranged on both sides of the first through hole;

[0011] The sealing part is two, two of the sealing part and two of the second hole one-to-one corresponding setting.

[0012] In some embodiments, the second hole is opened on the mounting part along the radial direction of the first hole.

[0013] In some embodiments, the mounting part comprises:

[0014] The fixed disc is fixed to the wellhead, and is coaxially arranged with the wellhead;

[0015] The first hole is opened in the middle of the fixed disc along the axial direction of the fixed disc;

[0016] The second hole is opened adjacent to the first hole along the radial direction of the fixed disc.

[0017] In some embodiments, the bottom of the fixed disc is detachably provided with a bolt assembly, and the fixed disc is connected with the wellhead through the bolt assembly.

[0018] In some embodiments, the sealing part comprises:

[0019] The driving assembly is movably arranged in the second hole, and one end of the driving assembly close to the first hole can move towards the first hole;

[0020] The sealing assembly is movably arranged at one end of the driving assembly close to the first hole, so that the driving assembly drives the sealing assembly to move;

[0021] One end of the sealing assembly close to the first hole is adapted to the first hole.

[0022] In some embodiments, the driving assembly comprises:

[0023] The moving rod is movably inserted into the second hole and connected with the sealing part at one end, and the other end of the moving rod extends to the outside of the mounting part away from the first hole.

[0024] In some embodiments, the driving assembly further comprises:

[0025] The connecting sleeve is arranged in the second hole along the circumferential direction of the second hole;

[0026] The moving rod is arranged in the second hole, and the moving rod is threadedly connected with the second hole.

[0027] In some specific embodiments, a sealing ring is embedded on the inner wall of the connecting sleeve around the circumference of the connecting sleeve, and the inner wall of the sealing ring is in movable abutment with the outer wall of the moving rod.

[0028] In some specific embodiments, the outer wall of the connecting sleeve near one end of the first through hole is in a step structure that is matched with the inner wall of the second through hole.

[0029] In some specific embodiments, a connecting rod is arranged on the moving rod along the axial direction of the moving rod near one end of the first through hole, and the connecting rod is rotatably connected with the sealing part near one end of the first through hole.

[0030] In some specific embodiments, the connecting rod is detachably connected with the moving rod through a pin near one end of the moving rod.

[0031] In some specific embodiments, a bearing is movably arranged between the outer wall of the connecting rod and the inner wall of the second through hole around the circumference of the second through hole.

[0032] In some specific embodiments, the sealing assembly comprises:

[0033] A sealing block is arranged on the moving rod near one end of the first through hole, the sealing block is matched with the first through hole, and the side of the sealing block near the first through hole can abut against the outer wall of the oil pipe.

[0034] In some specific embodiments, a pressing rod is arranged between the sealing block and the moving rod.

[0035] A plurality of supporting members are symmetrically arranged on the outer wall of the sealing block.

[0036] The pressing rod is detachably connected with the plurality of supporting members.

[0037] In some specific embodiments, a rotating groove is formed on the side of the pressing rod near the moving rod, and the pressing rod is rotatably clamped with the moving rod through the rotating groove.

[0038] In some specific embodiments, the end of the supporting member near the first through hole is bent towards the outside of the supporting member, so that the end face of the end of the supporting member near the first through hole forms an abutment face.

[0039] A semicircular groove that is matched with the outer circumference of the oil pipe is formed in the middle of the abutment face.

[0040] In some specific embodiments, a connecting member is further arranged between the pressing rod and the supporting member.

[0041] The pressing rod and the support member are matched with each other, and can extrude and limit the connecting member;

[0042] The connecting member is made of elastic material, and the reaction force during extrusion fills the wear loss.

[0043] In some specific embodiments, the connecting member is arranged around the circumference of the second through hole;

[0044] The two ends of the connecting member are arranged around the outer periphery of the pressing rod and the support member, and are respectively connected with the pressing rod and the support member.

[0045] In some specific embodiments, one end of the pressing rod close to the first through hole is inserted between the inner walls of the symmetrical support members away from the first through hole;

[0046] The pressing rod is connected with each of the symmetrical support members through a bolt.

[0047] A wellhead sealing method based on the same concept, using the wellhead sealing device according to any one of the above specific embodiments, comprising the following steps:

[0048] The mounting portion is mounted on the wellhead, and one end of the oil pipe is arranged in the first through hole of the mounting portion to the wellhead;

[0049] The sealing portion is driven to move towards the first through hole until one end of the sealing portion close to the first through hole is inserted into the first through hole, and at the same time, the end of the sealing portion inserted into the first through hole is filled between the oil pipe and the first through hole;

[0050] The sealing portion is continuously driven to move towards the first through hole until the end surface of the end of the sealing portion inserted into the first through hole abuts against the oil pipe and is arranged around the outer periphery of the oil pipe, filling the leakage space of the wellhead sealing device caused by wear.

[0051] The wellhead sealing device of the present application passes the oil pipe through the first through hole of the mounting part, and only moves the sealing part arranged in the second through hole communicated with the first through hole to the direction close to the first through hole until the sealing part is inserted into the first through hole and abuts against the oil pipe, so that the sealing operation of the external space of the oil pipe can be realized, and correspondingly, only by moving the sealing part to the direction away from the first through hole, the unsealing operation of the external space of the oil pipe can be realized. Instead of the original compression cap compression structure, the sealing and unsealing operations can be smoothly carried out while the dismounting conversion flange and the lifting operation are removed, the operation process is simplified, the operation difficulty is reduced, the operation construction in the case of lifting heavy objects is avoided, and the operation safety is improved. Moreover, the sealing effect is guaranteed by applying sufficient extrusion force to the oil pipe through the movement of the sealing part, so that the stability of the sealing is improved, and when leakage occurs after use, secondary extrusion can be carried out to realize resealing, so that the stability of the sealing life is guaranteed.

[0052] The wellhead sealing method of the present application has the same beneficial effects as the wellhead sealing device described above, and thus will not be described here.

[0053] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure indicated in the description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0055] Figure 1 A schematic view of the wellhead sealing device in the embodiment of the present application is shown;

[0056] Figure 2 A schematic view of the wellhead sealing device in the embodiment of the present application is shown;

[0057] Figure 3 A flowchart of the wellhead sealing method in the embodiment of the present application is shown.

[0058] In the figure, 100, mounting portion; 110, fixed disc; 120, bolt assembly; 200, sealing portion; 210, driving assembly; 211, moving rod; 212, connecting sleeve; 2121, first connecting ring; 2122, second connecting ring; 2123, third connecting ring; 213, sealing ring; 214, connecting rod; 215, bearing; 220, sealing assembly; 221, sealing block; 222, pressing rod; 223, support; 224, connecting piece. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0060] Reference Figure 1 The present application provides a wellhead sealing device, comprising: a mounting portion 100 and a sealing portion 200. The mounting portion 100 is arranged on the wellhead, and a first through hole is formed in the mounting portion 100 along the axial direction of the wellhead. A second through hole is also formed in the mounting portion 100, and one end of the second through hole communicates with the first through hole. The sealing portion 200 is movably arranged in the second through hole, and the sealing portion 200 can move towards the first through hole until the end of the sealing portion 200 close to the first through hole is inserted into the first through hole and abuts against the oil pipe.

[0061] Specifically, the mounting part 100 is mounted above the wellhead, and the wellhead can be blocked by the mounting part 100. The first through hole is arranged on the mounting part 100 along the axial direction of the wellhead, and is used for passing the oil pipe, so that the oil pipe can pass through the first through hole and reach the well. The second through hole is arranged on one side of the mounting part 100, and is located on one side of the first through hole. One end of the second through hole communicates with the first through hole. The sealing part 200 is arranged in the second through hole, and is movably connected with the second through hole. The sealing part 200 can move in the second through hole along the axial direction of the second through hole towards the first through hole or away from the first through hole. When the sealing part 200 moves in the second through hole along the axial direction of the second through hole towards the first through hole until one end of the sealing part 200 close to the first through hole is inserted into the first through hole, the one end of the sealing part 200 inserted into the first through hole can abut against the outer wall of the oil pipe passing through the first through hole. The shape and size of the one end of the sealing part 200 inserted into the first through hole are also matched with the shape and size of the first through hole. When the one end of the sealing part 200 inserted into the first through hole abuts against the outer wall of the oil pipe passing through the first through hole, the other space in the first through hole can be blocked by the one end of the sealing part 200 inserted into the first through hole, so as to seal the outer space of the oil pipe and realize the sealing operation. When sealing is not needed, the sealing part 200 only needs to move away from the first through hole to realize the unsealing operation of the outer space of the oil pipe. Instead of the original compression cap compression structure, the sealing and unsealing operations can be smoothly performed after the dismounting conversion flange and the lifting operation are removed, the operation process is simplified, the operation difficulty is reduced, the operation construction in the case of lifting heavy objects is avoided, and the operation safety is improved. When the one end of the sealing part 200 inserted into the first through hole abuts against the outer wall of the oil pipe passing through the first through hole, the sealing part 200 continues to move close to the first through hole to apply sufficient extrusion force to the outer wall of the oil pipe, so as to ensure the sealing effect and improve the stability of the sealing.

[0062] In some embodiments of the present application, with reference to Figure 1 The second through hole is two, and the two second through holes are symmetrically arranged on both sides of the first through hole. The sealing part 200 is two, and the two sealing parts 200 are arranged one by one corresponding to the two second through holes.

[0063] Specifically, two second through holes are symmetrically arranged on two sides of the mounting portion 100, so that the two second through holes are symmetrically located on two sides of the first through hole, and one end of each of the two second through holes is in communication with the first through hole. Two sealing portions 200 are arranged in the two second through holes respectively, and each of the two sealing portions 200 can move in the corresponding second through hole along the axial direction of the second through hole towards the first through hole or away from the first through hole. When the two sealing portions 200 move in the corresponding second through hole along the axial direction of the second through hole towards the first through hole until one end of each of the two sealing portions 200 close to the first through hole is inserted into the first through hole, the one end of each of the two sealing portions 200 inserted into the first through hole can abut against the two sides of the outer wall of the oil pipe passing through the first through hole respectively, and the shape and size of the one end of each of the two sealing portions 200 inserted into the first through hole are also adapted to the shape and size of the two sides of the first through hole respectively. When the one end of each of the two sealing portions 200 inserted into the first through hole abuts against the two sides of the outer wall of the oil pipe passing through the first through hole respectively, the one end of each of the two sealing portions 200 close to the first through hole also abuts against each other, so that the one end of each of the two sealing portions 200 close to the first through hole can be cooperated with each other to surround the outside of the oil pipe, and the other space in the first through hole can be blocked by the one end of each of the two sealing portions 200 inserted into the first through hole, so as to seal the outer space of the oil pipe. The cooperation of the two sealing portions 200 facilitates the sealing of the outer space of the oil pipe, reduces the probability of leakage, and the shape and size of the one end of each of the two sealing portions 200 inserted into the first through hole are also convenient to involve, which can reduce the processing cost.

[0064] It should be noted that the second through hole can be more than two, and the sealing portion 200 can also be more than two. The two or more sealing portions 200 are arranged in one-to-one correspondence with the two or more second through holes, and the two or more sealing portions 200 can collectively seal the outer space of the oil pipe. However, when the number of sealing portions 200 is too large, the number of junctions will inevitably increase, thereby increasing the probability of gaps. When the number of sealing portions 200 is two, the outer space of the oil pipe can be sealed, and the probability of gaps can also be effectively controlled.

[0065] In some embodiments of the present application, with reference to Figure 1 the second through hole is arranged on the mounting portion 100 along the radial direction of the first through hole. Specifically, the second through hole is horizontally arranged, so that the second through hole is arranged along the radial direction of the first through hole, and the extrusion force can be applied to the outer wall of the oil pipe along the radial direction of the oil pipe when the outer wall of the oil pipe abuts against the second through hole, which can further improve the implementation effect of the extrusion force, so that the oil pipe can be subjected to sufficient extrusion force through the movement of the sealing portion 200, thereby ensuring the sealing effect and improving the stability of the sealing.

[0066] In some embodiments of the present application, with reference to Figure 1The mounting part 100 comprises a fixing disc 110. The fixing disc 110 is arranged on the well mouth coaxially with the well mouth. A first through hole is arranged in the middle of the fixing disc 110 along the axial direction of the fixing disc 110. A second through hole is arranged on one side of the first through hole along the radial direction of the fixing disc 110. Specifically, the fixing disc 110 is arranged above the well mouth, the bottom surface of the fixing disc 110 is connected with the end of the well mouth, and the axis of the fixing disc 110 is collinear with the axis of the well mouth. The first through hole is arranged along the axial direction of the fixing disc 110, so that the first through hole can also be arranged along the axial direction of the well mouth. The second through hole is arranged along the radial direction of the fixing disc 110, so that the first through hole can also be arranged along the radial direction of the first through hole. The sealing part 200 can apply sufficient extrusion force to the oil pipe passing through the first through hole, thereby ensuring the sealing effect and improving the stability of the sealing.

[0067] Further, the fixing disc 110 can be a four-way component. Two opposite communication channels of the four-way component can form the first through hole, and the other two channels of the four-way component can form the other two second through holes. The structure is simple, the cost is low, and the use is convenient.

[0068] In some embodiments of the present application, with reference to Figure 2 The bottom of the fixing disc 110 is detachably provided with a bolt assembly 120, and the fixing disc 110 is connected with the well mouth through the bolt assembly 120. Specifically, the bolt assembly 120 comprises a plurality of bolts, and the plurality of bolts are uniformly and threadedly connected to the bottom side of the fixing disc 110, so as to be conveniently connected with the well mouth through the plurality of bolts.

[0069] Further, the top of the fixing disc 110 is also detachably provided with a bolt assembly 120, so that the fixing disc 110 can be connected with the blowout preventer through the plurality of bolts, and the installation is convenient.

[0070] In some embodiments of the present application, with reference to Figure 1 The sealing part 200 comprises a driving assembly 210 and a sealing assembly 220. The driving assembly 210 is movably arranged in the second through hole, and one end of the driving assembly 210 close to the first through hole can move towards the first through hole. The sealing assembly 220 is movably arranged at the one end of the driving assembly 210 close to the first through hole, so that the driving assembly 210 drives the sealing assembly 220 to move. The one end of the sealing assembly 220 close to the first through hole is adapted to the first through hole.

[0071] Specifically, the driving assembly 210 is arranged in the second through hole along the axial direction of the second through hole and is movably connected with the second through hole. By applying a force to the driving assembly 210, the driving assembly 210 can be driven to move along the axial direction of the second through hole, that is, the driving assembly 210 can be driven to move towards the first through hole or away from the first through hole. The sealing assembly 220 is arranged at one end of the driving assembly 210 close to the first through hole and is movably connected with the second through hole. When the driving assembly 210 is driven to move towards the first through hole or away from the first through hole, the sealing assembly 220 can be driven to move towards the first through hole or away from the first through hole. The side of the sealing assembly 220 close to the first through hole forms an abutting side. When the driving assembly 210 drives the sealing assembly 220 to move towards the first through hole until the sealing assembly 220 is inserted into the first through hole, the abutting side of the sealing assembly 220 can abut against the outer wall of the oil pipe in the first through hole. Moreover, the shape and size of the abutting side of the sealing assembly 220 are matched with the shape and size of the first through hole. As the driving assembly 210 continues to drive the sealing assembly 220 to move towards the first through hole, the edge side of the abutting side of the sealing assembly 220 can abut against the edge side of the abutting side of the sealing assembly 220 of the other sealing part 200. Thus, by cooperation of the plurality of sealing assemblies 220, the outer wall of the oil pipe can be surrounded in the circumferential direction, and the gap between the outer wall of the oil pipe and the inner wall of the first through hole can be sealed, so that the sealing operation is realized. By moving the sealing part 200 towards or away from the first through hole, the sealing and unsealing operations of the outer space of the oil pipe can be realized. Instead of the original compression cap compression structure, the sealing and unsealing operations can be smoothly performed after the dismounting conversion flange and the lifting operation are removed, the operation process is simplified, the operation difficulty is reduced, the operation construction in the case of lifting heavy objects is avoided, and the operation safety is improved. Moreover, sufficient extrusion force can be applied to the oil pipe, so that the sealing effect is ensured and the stability of the sealing is improved.

[0072] In some embodiments of the present application, reference is made to Figure 1The driving assembly 210 comprises a moving rod 211. One end of the moving rod 211 is movably inserted into the second through hole and connected with the sealing part 200, and the other end of the moving rod 211 extends to the outside of the mounting part 100 in a direction away from the first through hole. Specifically, one end of the moving rod 211 is movably inserted into the second through hole from the end of the second through hole away from the first through hole, and the end of the moving rod 211 inserted into the second through hole is connected with the sealing assembly 220, and the movement of the moving rod 211 in the second through hole can drive the sealing assembly 220 to move together. The other end of the moving rod 211, i.e., the end of the moving rod 211 away from the second through hole, extends to the outside of the fixed disc 110 in a direction away from the first through hole along the axial direction of the second through hole, thereby facilitating the movement of the moving rod 211 in the second through hole from the outside of the fixed disc 110. Instead of the original compression cap compression structure, the sealing and unsealing can still be smoothly performed while the disassembly conversion flange and the hoisting operation are removed, the operation process is simplified, and the operation difficulty is reduced.

[0073] In some embodiments of the present application, with reference to Figure 1 The driving assembly 210 further comprises a connecting sleeve 212. The connecting sleeve 212 is arranged in the second through hole in a circumferential direction of the second through hole. The moving rod 211 is arranged in the second through hole and is threadedly connected with the second through hole. Specifically, the connecting sleeve 212 is a cylindrical structure, and one end of the connecting sleeve 212 is inserted into the second through hole from the end of the second through hole away from the first through hole along the axial direction of the second through hole. The moving rod 211 is arranged in the connecting sleeve 212, so that one end of the moving rod 211 passes through the connecting sleeve 212 and is connected with the sealing assembly 220, and the other end of the moving rod 211 is arranged outside the connecting sleeve 212 along the axial direction of the second through hole. The outer wall of the moving rod 211 is threadedly connected with the inner wall of the connecting sleeve 212, so that the moving rod 211 can be driven to move along the axial direction of the second through hole by rotating the moving rod 211, and the moving rod 211 is limited, avoiding movement of the moving rod 211 under pressure, and ensuring the stability of the sealing. At the same time, since the end of the moving rod 211 away from the first through hole is arranged outside the connecting sleeve 212 along the axial direction of the second through hole, the moving rod 211 is facilitated to rotate. Moreover, the threadedly connected relationship between the outer wall of the moving rod 211 and the inner wall of the connecting sleeve 212 can form a sealing structure therebetween, thereby ensuring the sealing effect.

[0074] Further, the connecting sleeve 212 and the second through hole are in a threadedly connected relationship, which can ensure the sealing between the connecting sleeve 212 and the second through hole, and facilitate installation and disassembly.

[0075] In some embodiments of the present application, with reference to Figure 1The inner wall of the connecting sleeve 212 is embedded with a sealing ring 213 around the circumference of the connecting sleeve 212, and the inner wall of the sealing ring 213 is in movable abutment with the outer wall of the moving rod 211. Specifically, the inner wall of the connecting sleeve 212 is provided with a sealing groove around the circumference of the connecting sleeve 212, and the sealing ring 213 is embedded in the sealing groove, so that the connecting sleeve 212 can abut against the outer wall of the moving rod 211 through the sealing ring 213, and the gap between the moving rod 211 and the connecting sleeve 212 can be blocked by the sealing ring 213, thereby ensuring the sealing property.

[0076] In some embodiments of the present application, with reference to Figure 1 The outer wall of one end of the connecting sleeve 212 close to the first through hole and the inner wall of the second through hole are in a mutually adapted stepped structure.

[0077] Specifically, the connecting sleeve 212 comprises a first connecting ring 2121, a second connecting ring 2122 and a third connecting ring 2123. One end of the first connecting ring 2121 is inserted into one end of the third connecting ring 2123, one end of the second connecting ring 2122 is inserted into the other end of the third connecting ring 2123, and there is a gap between the end of the first connecting ring 2121 inserted into the third connecting ring 2123 and the end of the second connecting ring 2122 inserted into the third connecting ring 2123, so that a sealing groove is formed by the end face of the end of the first connecting ring 2121 inserted into the third connecting ring 2123, the end face of the end of the second connecting ring 2122 inserted into the third connecting ring 2123 and the inner wall of the third connecting ring 2123, thereby ensuring the sealing property of the connecting sleeve 212 itself after the sealing ring 213 is arranged. Moreover, one end of the second through hole away from the first through hole is provided with an embedding groove around the circumference of the second through hole, and the groove wall of the embedding groove is adapted to the outer wall of the connecting sleeve 212 composed of the first connecting ring 2121, the second connecting ring 2122 and the third connecting ring 2123. When the first connecting ring 2121 and the third connecting ring 2123 are inserted into the embedding groove close to the end of the first connecting ring 2121, the groove wall of the embedding groove can abut against the outer wall of the first connecting ring 2121 and the outer wall of the end of the third connecting ring 2123 close to the first connecting ring 2121, thereby forming a stepped structure between the groove wall of the embedding groove and the outer wall of the connecting sleeve 212, and further improving the sealing property between the connecting sleeve 212 and the second through hole. The outer wall of the end of the third connecting ring 2123 close to the first connecting ring 2121 is threadedly connected to the groove wall of the embedding groove, which facilitates disassembly and ensures the sealing property.

[0078] In some embodiments of the present application, with reference to Figure 1The end of the moving rod 211 close to the first through hole is provided with a connecting rod 214 along the axial direction of the moving rod 211, and the end of the connecting rod 214 close to the first through hole is rotationally connected with the sealing part 200. Specifically, the end of the moving rod 211 close to the first through hole is provided with the connecting rod 214, one end of the connecting rod 214 is connected with the middle of the end face of the end of the moving rod 211 close to the first through hole, and the other end of the connecting rod 214 extends along the axial direction of the second through hole towards the direction close to the first through hole. The end of the connecting rod 214 close to the first through hole is rotationally connected with the sealing assembly 220, when the sealing assembly 220 is driven to move by moving the moving rod 211, the connecting rod 214 can rotate with the moving rod 211 relative to the sealing assembly 220, so as to avoid driving the sealing assembly 220 to rotate, and ensure the accuracy of sealing.

[0079] In some embodiments of the present application, with reference to Figure 1 The end of the connecting rod 214 close to the moving rod 211 is detachably connected with the moving rod 211 through a pin. Specifically, the end of the connecting rod 214 away from the first through hole is inserted on the moving rod 211 along the axial direction of the moving rod 211, and the pin is inserted on the moving rod 211 along the radial direction of the moving rod 211, and the pin is inserted through the end of the connecting rod 214 away from the first through hole, so as to ensure the stability of the connection after installation, make the connecting rod 214 rotate with the moving rod 211, and facilitate installation and disassembly.

[0080] In some embodiments of the present application, with reference to Figure 1 The outer wall of the connecting rod 214 and the inner wall of the second through hole are movably provided with a bearing 215 around the circumferential direction of the second through hole. Specifically, the bearing 215 is clamped between the moving rod 211 and the sealing assembly 220, and the bearing 215 is arranged around the outer wall of the connecting rod 214 along the circumferential direction of the second through hole, so as to ensure smooth rotation of the moving rod 211 and the connecting rod 214 through the arrangement of the bearing 215.

[0081] In some embodiments of the present application, with reference to Figure 1The sealing assembly 220 comprises a sealing block 221. The sealing block 221 is arranged at one end of the moving rod 211 close to the first through hole, and is matched with the first through hole. One side of the sealing block 221 close to the first through hole can abut against the outer wall of the oil pipe. Specifically, the sealing block 221 is arranged at one end of the connecting rod 214 close to the first through hole and is rotationally connected with the connecting rod 214, so that the one side of the sealing block 221 close to the first through hole forms the abutting side of the sealing assembly 220. When the connecting rod 214 is rotated by the moving rod 211, the connecting rod 214 can be moved together towards the first through hole, thereby pushing the sealing block 221 to move towards the first through hole until the sealing block 221 is inserted into the first through hole and abuts against the outer wall of the oil pipe. The shape and size of the sealing block 221 are matched with those of the first through hole. As the moving rod 211 and the connecting rod 214 continue to move the sealing block 221 towards the first through hole, the side of the sealing block 221 can abut against the side of the sealing block 221 of the sealing assembly 220 of the other sealing part 200, so that the outer wall of the oil pipe can be surrounded by the mutual cooperation of the plurality of sealing blocks 221 in the circumferential direction of the oil pipe, and the gap between the outer wall of the oil pipe and the inner wall of the first through hole can be sealed, thereby realizing the sealing operation.

[0082] In some embodiments of the present application, with reference to Figure 1 The sealing block 221 and the moving rod 211 are provided with a pressing rod 222, and the outer wall of the sealing block 221 is symmetrically provided with a support 223. The pressing rod 222 is detachably connected with the support 223. Specifically, the pressing rod 222 is slidingly arranged between one end of the connecting rod 214 close to the first through hole and the side of the sealing block 221 away from the first through hole, thereby ensuring the stability of the connection and avoiding the problem that the sealing block 221 is not easily connected with the connecting rod 214. The plurality of supports 223 are arranged around the second through hole in the circumferential direction of the sealing block 221 and are symmetrically arranged on the outer wall of the sealing block 221 and are slidingly connected with the inner wall of the second through hole. The supports 223 can support the sealing block 221, thereby limiting the deformation shape of the sealing block 221 when the sealing block 221 is extruded, so that the sealing block 221 can exactly seal the outer space of the oil pipe and avoid the gap between the sealing block 221 and the other sealing block 221. In addition, the pressing rod 222 is moved close to the first through hole and the end of the support 223 away from the first through hole is detachably connected, so that the pressing rod 222 is indirectly connected with the sealing block 221.

[0083] Further, the pressing rod 222 is inserted between the inner walls of the plurality of support members 223 away from the first through hole at one end close to the first through hole. The pressing rod 222 is connected with each of the support members 223 by a bolt. When the pressing rod 222 moves, each of the support members 223 connected by the bolt can be pushed or pulled to move together with the pressing rod 222, and the sealing block 221 is moved at the same time.

[0084] In some embodiments of the present application, referring to Figure 1 The pressing rod 222 is provided with a rotating groove at one side close to the moving rod 211, and the pressing rod 222 is rotationally connected with the moving rod 211 through the rotating groove. Specifically, the rotating groove is provided in the middle of the end face of the one end of the pressing rod 222 away from the first through hole, so that the rotating groove is opposite to the connecting rod 214. The one end of the connecting rod 214 close to the first through hole is rotationally inserted into the rotating groove and rotationally connected through the clamping structure, so that the moving rod 211 does not rotate the sealing block 221 when the connecting rod 214 is rotationally moved, and the accuracy of the sealing is ensured.

[0085] In some embodiments of the present application, referring to Figure 1 The support member 223 is bent towards the outside of the support member 223 at one end close to the first through hole, so that the end face of the one end of the support member 223 close to the first through hole forms an abutting face. Specifically, the one end of the support member 223 close to the first through hole is bent away from the sealing block 221 along the radial direction of the second through hole until the outer wall of the one end of the support member 223 close to the first through hole is in sliding abutment with the inner wall of the second through hole, so that the end face of the one end of the support member 223 close to the first through hole forms an abutting face. When the moving rod 211 and the connecting rod 214 drive the pressing rod 222, the support member 223 and the sealing block 221 to move together towards the direction close to the first through hole until the sealing block 221 cooperates with the other sealing block 221 to surround the outer wall of the oil pipe, the abutting faces of the two support members 223 are in abutment with each other by continuously driving the support member 223 and the sealing block 221 to move towards the direction close to the first through hole, so that the accuracy of the sealing is ensured and the sealing effect is improved.

[0086] Further, the middle of the abutting face of the support member 223 and the middle of the side of the sealing block 221 close to the oil pipe are provided with semicircular grooves, which are matched with the size of the outer periphery of the oil pipe, so as to facilitate abutment with the outer wall of the oil pipe and to fill the gap between the outer wall of the oil pipe and the inner wall of the first through hole.

[0087] In some embodiments of the present application, referring to Figure 3The compression rod 222 is connected with the support 223 through the connecting piece 224. The compression rod 222 and the support 223 cooperate to extrude and limit the connecting piece 224. Specifically, the connecting piece 224 is arranged between the compression rod 222 and the support 223, and the two ends of the connecting piece 224 are connected with the compression rod 222 and the support 223, respectively. The edges of the plurality of symmetrical supports 223 are spaced apart, the connecting piece 224 can contact the sealing block 221 through the space between the edges of the plurality of symmetrical supports 223, and is used for bearing and pushing the sealing block 221. The connecting piece 224 is made of compressible material, and the compression rod 222 and the support 223 cooperate to extrude the connecting piece 224. The compression rod 222 extrudes the connecting piece 224, and the support 223 limits the connecting piece 224. When the sealing block 221 cooperates with another sealing block 221 to surround the outer wall of the oil pipe, and the abutting surfaces of the two supports 223 also abut each other, the compression rod 222 is further moved towards the first through hole by moving the moving rod 211 and the connecting rod 214, the connecting piece 224 is compressed, the connecting piece 224 is deformed by compression, and the reaction force generated after the compression of the connecting piece 224 further strengthens the extrusion force of the sealing block 221 and the support, forming a two-stage sealing structure and improving the sealing effect.

[0088] Further, the connecting piece 224 is made of elastic material. When the required sealing formed by the support 223 deteriorates due to wear, the reaction force generated by extrusion can fill the lost space caused by wear, thereby restoring the sealing effect, avoiding replacement of the sealing element in complex operation construction, reducing the cost, and prolonging the service life.

[0089] In some embodiments of the present application, with reference to ​ The connecting piece 224 is arranged around the circumference of the second through hole. The two ends of the connecting piece 224 are arranged around the outer circumferences of the compression rod 222 and the support 223, and are respectively clamped with the compression rod 222 and the support 223. Specifically, the first compression groove is formed on the outer wall of the compression rod 222, and the second compression groove is formed on the outer wall of the support 223. The end of the connecting piece 224 is sleeved in the first compression groove, and the other end of the connecting piece 224 is sleeved in the second compression groove. The connecting piece 224 can not only provide extrusion force through the compressed connecting piece 224, but also seal the support 223 and the second through hole and the compression rod 222 and the second through hole through the connecting piece 224, thereby ensuring the sealing effect.

[0090] With reference to ​The wellhead sealing method comprises the following steps: the mounting portion 100 is installed on the wellhead, one end of the oil pipe is arranged in the first through hole of the mounting portion 100 and reaches the wellhead; the sealing portion 200 is driven to move towards the first through hole until the end of the sealing portion 200 close to the first through hole is arranged in the first through hole; the sealing portion 200 is continuously driven to move towards the first through hole until the end face of the end of the sealing portion 200 arranged in the first through hole abuts against the oil pipe and is arranged around the outer periphery of the oil pipe, and meanwhile, the end of the sealing portion 200 arranged in the first through hole is filled between the oil pipe and the first through hole. The oil pipe passes through the first through hole of the mounting portion 100 of the wellhead sealing device, and only by driving the sealing portion 200 arranged in the second through hole communicated with the first through hole to move towards the first through hole until the plurality of sealing blocks 221 and the supporting pieces 223 abut against each other, the sealing operation of the external space of the oil pipe can be realized. Correspondingly, only by driving the sealing portion 200 to move away from the first through hole, the unsealing operation of the external space of the oil pipe can be realized. Instead of the original structure of the pressure cap, the sealing and unsealing operations can be smoothly performed while the dismounting and conversion flange and the hoisting operation are removed, the operation process is simplified, the operation difficulty is reduced, the operation construction in the case of hoisting heavy objects is avoided, and the operation safety is improved. Moreover, sufficient extrusion force can be applied to the oil pipe, so as to ensure the sealing effect and improve the stability of the sealing.

[0091] Although the present application is described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wellhead sealing device, characterized in that, include: The mounting part (100) is installed on the wellhead, and the mounting part (100) has a first through hole through which the oil supply pipe passes along the axial direction of the wellhead; The mounting part (100) is also provided with a second through hole, one end of which faces the first through hole and communicates with the first through hole; A sealing part (200) is movably disposed within the second through hole, and the sealing part (200) is movable toward the first through hole; When the end of the sealing part (200) near the first through hole is inserted into the first through hole, the end face of the end of the sealing part (200) inserted into the first through hole abuts against the oil pipe and surrounds the outer periphery of the oil pipe, and the end of the sealing part (200) inserted into the first through hole fills the gap between the oil pipe and the first through hole. There are two second through holes, which are symmetrically opened on both sides of the first through hole; There are two sealing parts (200), and the two sealing parts (200) are provided in a one-to-one correspondence with the two second through holes; The second through hole is formed on the mounting portion (100) radially along the first through hole; The sealing part (200) includes: A drive assembly (210) is movably disposed within the second through hole, and the end of the drive assembly (210) near the first through hole is movable toward the first through hole; A sealing assembly (220) is movably disposed at one end of the drive assembly (210) near the first through hole, so that the drive assembly (210) drives the sealing assembly (220) to move; The end of the sealing assembly (220) near the first through hole is adapted to the first through hole; The driving component (210) includes: A movable rod (211) is provided, one end of which is movably inserted into the second through hole and connected to the sealing part (200), and the other end of which extends away from the first through hole to the outside of the mounting part (100). The drive component (210) further includes: A connecting sleeve (212) is circumferentially disposed within the second through hole; The movable rod (211) is provided through the second through hole, and the movable rod (211) is threadedly connected to the second through hole; The sealing assembly (220) includes: A sealing block (221) is provided at one end of the moving rod (211) near the first through hole. The sealing block (221) is adapted to the first through hole, and the side of the sealing block (221) near the first through hole can abut against the outer wall of the oil pipe. A pressure rod (222) is provided between the sealing block (221) and the moving rod (211); Multiple support members (223) are symmetrically arranged on the outer wall of the sealing block (221); The pressure bar (222) is detachably connected to the plurality of support members (223); A connector (224) is also provided between the pressure rod (222) and the support member (223); The pressure bar (222) cooperates with the support member (223) to compress and limit the connector (224); The connector (224) is made of elastic material and fills the wear and leakage through the reaction force during compression.

2. The wellhead sealing device according to claim 1, characterized in that, The mounting part (100) includes: A fixed plate (110) is fixedly installed on the wellhead and is coaxially arranged with the wellhead; The first through hole is formed along the axial direction of the fixed disk (110) at the middle part of the fixed disk (110); The second through hole is opened radially adjacent to the first through hole along the fixed plate (110).

3. The wellhead sealing device according to claim 2, characterized in that, The bottom of the fixing plate (110) is detachably provided with a bolt assembly (120), and the fixing plate (110) is connected to the wellhead through the bolt assembly (120).

4. The wellhead sealing device according to claim 1, characterized in that, A sealing ring (213) is circumferentially embedded on the inner wall of the connecting sleeve (212), and the inner wall of the sealing ring (213) is in movable contact with the outer wall of the moving rod (211).

5. The wellhead sealing device according to claim 1, characterized in that, The outer wall of the connecting sleeve (212) near the first through hole and the inner wall of the second through hole are mutually adapted stepped structures.

6. The wellhead sealing device according to claim 1, characterized in that, A connecting rod (214) is provided along the axial direction of the moving rod (211) at one end near the first through hole, and the connecting rod (214) at one end near the first through hole is rotatably connected to the sealing part (200).

7. The wellhead sealing device according to claim 6, characterized in that, The end of the connecting rod (214) near the moving rod (211) is detachably connected to the moving rod (211) by a pin.

8. The wellhead sealing device according to claim 6, characterized in that, A bearing (215) is circumferentially movably disposed between the outer wall of the connecting rod (214) and the inner wall of the second through hole.

9. The wellhead sealing device according to claim 1, characterized in that, The pressure rod (222) has a rotating groove on the side near the moving rod (211), and the pressure rod (222) is rotatably engaged with the moving rod (211) through the rotating groove.

10. The wellhead sealing device according to claim 1, characterized in that, The end of the support member (223) near the first through hole is bent outward so that the end face of the support member (223) near the first through hole forms an abutment surface; A semi-circular groove adapted to the outer periphery of the oil pipe is provided in the middle of the contact surface.

11. The wellhead sealing device according to claim 1, characterized in that, The connector (224) is circumferentially arranged around the second through hole; The two ends of the connector (224) are respectively arranged around the outer periphery of the pressure rod (222) and the support member (223), and are respectively engaged with the pressure rod (222) and the support member (223).

12. The wellhead sealing device according to claim 11, characterized in that, The end of the pressure rod (222) near the first through hole is inserted between the inner walls of the symmetrical support member (223) away from the first through hole; The pressure bar (222) is connected to each of the symmetrical support members (223) by means of a pin.

13. A wellhead sealing method, employing the wellhead sealing device as described in any one of claims 1 to 12, characterized in that, Includes the following steps: The mounting part (100) is installed on the wellhead, and one end of the oil pipe passes through the first through hole of the mounting part (100) into the wellhead; Drive the sealing part (200) to move toward the first through hole until one end of the sealing part (200) near the first through hole is inserted into the first through hole. At the same time, the end of the sealing part (200) inserted into the first through hole fills the gap between the oil pipe and the first through hole. Continue to drive the sealing part (200) towards the direction of the first through hole until the end face of the sealing part (200) inserted into the first through hole abuts against the oil pipe and surrounds the outer periphery of the oil pipe, filling the leakage space of the wellhead sealing device caused by wear.

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