A combined petroleum bridge plug

Abstract

The present invention provides a combined oil bridge plug, which relates to the technical field of oil drilling tools, including: a first bridge plug pipe, the left end of the first bridge plug pipe is movably connected to a second bridge plug pipe, the right end of the first bridge plug pipe is fixedly connected to a bridge plug end head, and the right end of the first bridge plug pipe is fixedly connected to a conical joint. In the oil bridge plug of the present application, the bridge plug end head can be disassembled from the spiral casing, and the rubber expansion ring can be pulled to the right for disassembly, and the rubber expansion ring suitable for this wellbore structure can be replaced, and the movable support ring with a structure matching the rubber expansion ring can be replaced, so that the oil bridge plug can adapt to wellbores with different structures and geological environments, and there is no need to completely replace different types of oil bridge plugs, which solves the problem that the specifications, sizes, materials and structures of the expansion structure may be different. The expansion structure of the traditional oil bridge plug is integrated with the main body, and it cannot be applied to wellbores with different oil drilling methods, specifications and geological environments.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling tools, in particular to a combined oil bridge plug. Background Art

[0002] The oil bridge plug is a key device used to control the flow of fluid in the well during oil exploration and production. Its main function is to seal the oil and gas well. The working principle of the bridge plug is to use a cable or a pipe string to transport it to a predetermined position in the wellbore. The pressure generated by the gunpowder blasting, hydraulic sealing or mechanical sealing tools acts on the upper slip, and the upper and lower cones apply two forces, namely, upward pressure and downward pull, to the sealing rubber cylinder, so that the rubber cylinder expands and seals, completing the sealing.

[0003] In the oil bridge plugs in the prior art, when the bridge plugs are actually used, due to the different oil drilling methods, specifications and geological environment conditions, the oil bridge plugs that need to be used have different specifications, and the specifications, sizes, materials and structures of the expansion structure will also be different. The expansion structure of the traditional oil bridge plug is integrated with the main body, and it cannot be applied to wellbores with different oil drilling methods, specifications and geological environments. Summary of the invention

[0004] The disclosed embodiment relates to a combined oil bridge plug to solve the problem in the prior art that, in the actual application of the oil bridge plug, due to the different oil drilling methods, specifications and geological environment conditions, the oil bridge plugs with different specifications need to be used, and the specifications, size, material and structure of the expansion structure will also be different. The expansion structure of the traditional oil bridge plug is integrated with the main body, and it cannot be applied to wellbores with different oil drilling methods, specifications and geological environments.

[0005] According to a first aspect of the present disclosure, a combined petroleum bridge plug is provided, specifically comprising: a first bridge plug pipe, the left end of the first bridge plug pipe is movably connected to a second bridge plug pipe, the right end of the first bridge plug pipe is fixedly connected to a bridge plug end head, the right end of the first bridge plug pipe is fixedly connected to a conical joint, the conical joint is located inside the right end of the bridge plug end head, the left end face of the bridge plug end head is connected to a movable support ring by screws, the right side of the second bridge plug pipe is sleeved with a rubber expansion ring, the rubber expansion ring is sleeved on the movable support ring, the second bridge plug pipe and the bridge plug end head are sleeved with an elastic protective layer, the movable support ring and the rubber expansion ring are located inside the elastic protective layer, and a hand-release traction connecting rope is installed at the inner end of the conical joint, and the hand-release traction connecting rope passes through the center of the first bridge plug pipe and the second bridge plug pipe.

[0006] In at least some embodiments, the right end of the first connecting pipe of the bridge plug is fixedly connected with a spiral casing, the outer surface of the spiral casing is processed with casing external threads, and the left end of the first connecting pipe of the bridge plug is fixedly connected with an elastic cannula.

[0007] In at least some embodiments, the elastic insert tube is in a circular tube structure, a locking outer convex ring is fixedly connected to the left end of the outer surface of the elastic insert tube, the cross section of the locking outer convex ring is in a triangular structure, and the inclined surface of the locking outer convex ring faces the left outer side.

[0008] In at least some embodiments, a first annular groove of an annular structure is provided on the left side of the outer surface of the second connecting pipe of the bridge plug, and a docking cavity of a circular cavity structure is provided on the right end of the inner side of the second connecting pipe of the bridge plug.

[0009] In at least some embodiments, a locking inner convex ring is fixedly connected to the left side of the inner wall of the docking cavity. The cross-section of the locking inner convex ring is wedge-shaped, and the inclined surface of the locking inner convex ring faces inward and rightward. The elastic insert is tightly inserted into the interior of the docking cavity.

[0010] In at least some embodiments, a second annular groove is provided on the left side of the outer wall of the bridge plug end, and an end docking socket is provided transversely through the interior of the bridge plug end, and an internal thread of the end docking socket is processed on the inner wall of the end docking socket.

[0011] In at least some embodiments, a docking screw hole is provided on the left end face of the bridge plug end, the docking screw hole is perpendicular to the left end face of the bridge plug end, the spiral sleeve is movably connected inside the docking socket of the end, and the outer thread of the sleeve is spirally connected to the inner thread of the socket of the plug end.

[0012] In at least some embodiments, the cross-section of the movable support ring is wedge-shaped, the inclined surface of the movable support ring faces leftward, a support ring positioning hole is provided on the movable support ring, and the support ring positioning hole is fixedly connected to the docking screw hole by screws.

[0013] In at least some embodiments, the rubber expansion ring is a ring body made of rubber material, the cross-section of the rubber expansion ring is a wedge-shaped structure, the inclined surface of the rubber expansion ring faces inward and rightward, the inclined surface of the rubber expansion ring is in contact with the inclined surface of the movable support ring, and the outer surface of the rubber expansion ring is processed with anti-slip grooves.

[0014] The present invention provides a combined petroleum bridge plug, which has the following beneficial effects:

[0015] The oil bridge plug in the present invention is a combined oil bridge plug. During normal use, the contraction of the first pipe and the second pipe of the bridge plug is controlled by pulling the connecting rope, so that the movable support ring is inserted into the rubber expansion ring. The rubber expansion ring is expanded through the contact between the two conical surfaces to seal the inside of the wellbore. For different types of wellbores, the required bridge plug structure and size are different, and the rubber expansion ring needs to be replaced. In the oil bridge plug of the present application, the bridge plug end can be removed from the spiral casing, and the rubber expansion ring can be pulled to the right to be removed and replaced with a rubber expansion ring suitable for this wellbore structure, and the movable support ring can be removed from the left end of the bridge plug end and replaced with an movable support ring with a structure matching the rubber expansion ring, so that the oil bridge plug can adapt to wellbores with different structures and geological environments, without the need to completely replace different types of oil bridge plugs.

[0016] In addition, annular grooves are arranged on the second connecting pipe of the bridge plug and the end of the bridge plug in the present application, and the second connecting pipe of the bridge plug is connected to the end of the bridge plug by an elastic protective layer. The elastic protective layer is an elastic sheath with tightening structures at both ends, and the elastic structures at both ends are respectively located inside the two annular grooves. The movable support ring and the rubber expansion ring between the second connecting pipe of the bridge plug and the end of the bridge plug are covered and surrounded by the elastic protective layer, thereby reducing the friction generated during the movement of the bridge plug along the wellbore, and reducing the probability of soil or stones entering the movable support ring and the rubber expansion ring and causing damage to them, thereby playing a protective role, and maintaining the distance between the first connecting pipe of the bridge plug and the second connecting pipe of the bridge plug, thereby reducing the failure rate of the oil bridge plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached picture:

[0020] Figure 1 A schematic diagram showing the overall structure of the present application;

[0021] Figure 2 A schematic diagram showing the internal structure of the present application is shown;

[0022] Figure 3 Shows this application Figure 2 A schematic diagram of the structure from a top view;

[0023] Figure 4 It shows a schematic diagram of the structure of the petroleum bridge plug in the present application in a contracted state;

[0024] Figure 5 It shows a schematic diagram of the structure of the petroleum bridge plug in the decomposed state of the present application;

[0025] Figure 6 A schematic diagram of the structure inside the bridge plug end of the present application is shown;

[0026] Figure 7 It shows a schematic diagram of the structure inside the second connecting pipe of the bridge plug of the present application;

[0027] Figure 8 A schematic diagram of the structure inside the first connecting pipe of the bridge plug of the present application is shown.

[0028] Reference numerals list

[0029] 1. The first connecting pipe of the bridge plug; 101. The spiral casing; 102. The outer thread of the casing; 103. The elastic insert; 104. The outer locking convex ring; 2. The second connecting pipe of the bridge plug; 201. The first annular groove; 202. The docking cavity; 203. The inner locking convex ring; 3. The end of the bridge plug; 301. The second annular groove; 302. The end docking socket; 303. The inner thread of the end socket; 304. The docking screw hole; 4. The conical joint; 5. The movable support ring; 501. The support ring positioning hole; 6. The rubber expansion ring; 601. The inner cone of the expansion ring; 602. The anti-skid pattern; 7. The elastic protective layer; 8. The hand-release traction cable. DETAILED DESCRIPTION

[0030] Example 1: Please refer to Figures 1 to 8 :

[0031] The present invention proposes a combined petroleum bridge plug, comprising: a first bridge plug pipe 1, a second bridge plug pipe 2 being movably connected to the left end of the first bridge plug pipe 1, a bridge plug end head 3 being fixedly connected to the right end of the first bridge plug pipe 1, a conical joint 4 being fixedly connected to the right end of the first bridge plug pipe 1, the conical joint 4 being located inside the right end of the bridge plug end head 3, a movable support ring 5 being connected to the left end face of the bridge plug end head 3 by screws, a rubber expansion ring 6 being sleeved on the right side of the second bridge plug pipe 2, the rubber expansion ring 6 being sleeved on the movable support ring 5, an elastic protective layer 7 being sleeved on the second bridge plug pipe 2 and the bridge plug end head 3, the movable support ring 5 and the rubber expansion ring 6 being sleeved on the movable support ring 5, The rubber expansion ring 6 is located inside the elastic protective layer 7, and a hand-release traction cable 8 is installed at the inner end of the conical joint 4, and the hand-release traction cable 8 passes through the center of the first connecting pipe 1 of the bridge plug and the second connecting pipe 2 of the bridge plug; the right end of the first connecting pipe 1 of the bridge plug is fixedly connected with a spiral sleeve 101, and the outer surface of the spiral sleeve 101 is processed with a sleeve external thread 102, and the left end of the first connecting pipe 1 of the bridge plug is fixedly connected with an elastic insert tube 103, and the elastic insert tube 103 is a circular tube structure, and the left end of the outer surface of the elastic insert tube 103 is fixedly connected with a locking outer convex ring 104, and the cross-section of the locking outer convex ring 104 is a triangular structure, and the inclined surface of the locking outer convex ring 104 is The second connecting pipe 2 of the bridge plug is provided with a circular hollow connecting cavity 202 at the right end thereof; a locking inner convex ring 203 is fixedly connected to the left side of the inner wall of the connecting cavity 202, and the locking inner convex ring 203 has a wedge-shaped cross section, and the inclined surface of the locking inner convex ring 203 faces the inner right side, and the elastic insert 103 is tightly inserted into the connecting cavity 202; under normal conditions, the structural stability of the petroleum bridge plug is maintained by the tight insertion of the connecting cavity 202 and the elastic insert 103, and the two parts are kept in a docking state, and the locking outer convex ring 104 is located on the right side of the locking inner convex ring 203, and when the first connecting pipe of the bridge plug is in a closed position, the locking outer convex ring 104 is located on the right side of the locking inner convex ring 203. When pushed to the left by the pulling force, the elastic insert 103 moves to the left, the locking outer convex ring 104 fits tightly with the inclined surface of the locking inner convex ring 203, and the elastic insert 103 contracts during the pushing action, so that the locking outer convex ring 104 enters the left end of the locking inner convex ring 203, so that the left end surface of the locking inner convex ring 203 fits with the right end surface of the locking outer convex ring 104, forming a limit, so that the second pipe 2 of the bridge plug is fixedly connected with the first pipe 1 of the bridge plug, and the positional relationship between the two is maintained, and the movable support ring 5 and the rubber expansion ring 6 are kept tightened, so that the rubber expansion ring 6 maintains an expanded state and is fixed inside the wellbore.

[0032] In the disclosed embodiment, an end docking socket 302 is transversely penetrated inside the bridge plug end 3, and an internal end socket thread 303 is processed on the inner wall of the end docking socket 302. The spiral sleeve 101 is movably connected inside the end docking socket 302, and the sleeve external thread 102 is spirally connected to the internal end socket thread 303; through the spiral connection between the sleeve external thread 102 and the internal end socket thread 303, the bridge plug end 3 can be disassembled from the right end of the first bridge plug pipe 1 by rotation, so as to replace the movable support ring 5 and the rubber expansion ring 6 on the left side thereof.

[0033] In the disclosed embodiment, a docking screw hole 304 is provided on the left end face of the bridge plug end 3, and the docking screw hole 304 is perpendicular to the left end face of the bridge plug end 3; the cross-section of the movable support ring 5 is a wedge-shaped structure, and the inclined surface of the movable support ring 5 faces the left side. A support ring positioning hole 501 is provided on the movable support ring 5, and the support ring positioning hole 501 is fixedly connected to the docking screw hole 304 by screws; the movable support ring 5 is fixedly connected to the left end face of the bridge plug end 3 by screws, which facilitates the disassembly of the movable support ring 5 and the replacement of the movable support ring 5 with a structure matching the rubber expansion ring 6.

[0034] In the disclosed embodiment, the rubber expansion ring 6 is a ring body made of rubber material, and the cross-section of the rubber expansion ring 6 is a wedge-shaped structure. The inclined surface of the rubber expansion ring 6 faces the inner right, and the inclined surface of the rubber expansion ring 6 fits with the inclined surface of the movable support ring 5. The outer surface of the rubber expansion ring 6 is processed with anti-slip grooves 602; when the contraction of the first pipe 1 and the second pipe 2 of the bridge plug is controlled by the hand-release pulling cable 8, the movable support ring 5 is inserted into the rubber expansion ring 6, and the rubber expansion ring 6 is expanded through the contact between the two conical surfaces to seal the inside of the wellbore.

[0035] Embodiment 2, on the basis of embodiment 1, a first annular groove 201 of an annular structure is provided on the left side of the outer surface of the second connecting pipe 2 of the bridge plug, a second annular groove 301 is provided on the left side of the outer wall of the bridge plug end 3, annular grooves are provided on the second connecting pipe 2 of the bridge plug and the bridge plug end 3, and the second connecting pipe 2 of the bridge plug and the bridge plug end 3 are connected by an elastic protective layer 7, the elastic protective layer 7 is an elastic sheath with tightening structures at both ends, and the elastic structures at both ends are respectively located inside the two annular grooves, and the movable support ring 5 and the rubber expansion ring 6 between the second connecting pipe 2 of the bridge plug and the bridge plug end 3 are covered and surrounded by the elastic protective layer 7, so as to reduce the friction generated during the movement of the bridge plug along the wellbore, and reduce the probability of soil or stones entering the movable support ring 5 and the rubber expansion ring 6 and causing damage to them.

[0036] Working principle of this embodiment: First, when installing the oil bridge plug, it is transported to the predetermined position of the wellbore by using a cable or a pipe column, and then the release device is used to pull the release traction cable 8, and the oil bridge plug body is fixed, so that the release traction cable 8 pulls the tapered joint 4, the first bridge plug 1 and the bridge plug end 3 to the left, so that the casing outer thread 102 moves to the left along the docking cavity 202, so that the elastic plug 103 and the inclined surface of the locking inner convex ring 203 are fitted to each other, and the elastic plug 103 shrinks through the pushing action. , so that the locking outer convex ring 104 enters the left end of the locking inner convex ring 203, so that the left end surface of the locking inner convex ring 203 fits with the right end surface of the locking outer convex ring 104 to form a limit, so that the second pipe 2 of the bridge plug is fixedly connected with the first pipe 1 of the bridge plug. At the same time, under the action of the extrusion force, the rubber expansion ring 6 overlaps with the movable support ring 5, so that the rubber expansion ring 6 is sleeved on the movable support ring 5 and surrounds the movable support ring 5. Due to the cone surface of the movable support ring 5, the structure of the rubber expansion ring 6 expands, and the outer diameter of the rubber expansion ring 6 increases, so that The diameter of the oil bridge plug is increased, and it is expanded and fixed inside the wellbore to achieve sealing. The position between the first pipe 1 of the bridge plug and the second pipe 2 of the bridge plug is fixed, and the movable support ring 5 and the rubber expansion ring 6 are kept tightened to keep the rubber expansion ring 6 in an expanded state and fixed inside the wellbore. As the hand-release traction cable 8 continues to shrink, the hand-release traction cable 8 is separated from the tapered joint 4, and the installation of the oil bridge plug can be completed. When the bridge plug structure and size required by different wellbore structures are different, the rubber expansion ring 6 needs to be replaced. In the oil bridge plug of the present application, the bridge plug end 3 can be removed from the spiral casing 101, and the rubber expansion ring 6 can be pulled to the right for removal, and the rubber expansion ring 6 suitable for this wellbore structure can be replaced. The movable support ring 5 is removed from the left end of the bridge plug end 3, and the movable support ring 5 with a structure matching the rubber expansion ring 6 is replaced, so that the oil bridge plug can adapt to wellbores with different structures and geological environments. There is no need to completely replace different types of oil bridge plugs, which saves the time required for replacing the oil bridge plug, improves the installation efficiency of the oil bridge plug, and reduces the installation cost of the oil bridge plug.

Claims

1. A combined petroleum bridge plug, characterized in that: include: A first bridge plug pipe (1), the left end of the first bridge plug pipe (1) is movably connected to a second bridge plug pipe (2), the right end of the first bridge plug pipe (1) is fixedly connected to a bridge plug end head (3), the right end of the first bridge plug pipe (1) is fixedly connected to a conical joint (4), the conical joint (4) is located inside the right end of the bridge plug end head (3), the left end face of the bridge plug end head (3) is connected to a movable support ring (5) via screws, and the right end face of the second bridge plug pipe (2) is fixedly connected to a bridge plug end head (3). A rubber expansion ring (6) is sleeved on the side, and the rubber expansion ring (6) is sleeved on the movable support ring (5). An elastic protective layer (7) is sleeved on the second pipe (2) of the bridge plug and the end (3) of the bridge plug. The movable support ring (5) and the rubber expansion ring (6) are located inside the elastic protective layer (7). A hand-release traction connecting rope (8) is installed at the inner end of the conical joint (4). The hand-release traction connecting rope (8) runs through the center of the first pipe (1) of the bridge plug and the second pipe (2) of the bridge plug.

2. A combined petroleum bridge plug according to claim 1, characterized in that: The right end of the first connecting pipe (1) of the bridge plug is fixedly connected with a spiral sleeve (101), the outer surface of the spiral sleeve (101) is processed with a sleeve external thread (102), and the left end of the first connecting pipe (1) of the bridge plug is fixedly connected with an elastic insert (103).

3. A combined petroleum bridge plug according to claim 2, characterized in that: The elastic insert tube (103) is in a circular tube structure. The left end of the outer surface of the elastic insert tube (103) is fixedly connected with a locking outer convex ring (104). The cross section of the locking outer convex ring (104) is in a triangular structure. The inclined surface of the locking outer convex ring (104) faces the left outer side.

4. A combined petroleum bridge plug according to claim 3, characterized in that: A first annular groove (201) of an annular structure is provided on the left side of the outer surface of the second bridge plug connecting pipe (2), and a docking cavity (202) of a circular cavity structure is provided on the right end of the inside of the second bridge plug connecting pipe (2).

5. The combined petroleum bridge plug according to claim 4, characterized in that: A locking inner convex ring (203) is fixedly connected to the left side of the inner wall of the docking cavity (202). The cross section of the locking inner convex ring (203) is wedge-shaped, and the inclined surface of the locking inner convex ring (203) faces the inner right side. The elastic insert tube (103) is tightly inserted into the interior of the docking cavity (202).

6. The combined petroleum bridge plug according to claim 2, characterized in that: A second annular groove (301) is provided on the left side of the outer wall of the bridge plug end (3), and an end butt socket (302) is provided transversely through the interior of the bridge plug end (3), and an end socket internal thread (303) is processed on the inner wall of the end butt socket (302).

7. The combined petroleum bridge plug according to claim 6, characterized in that: The left end face of the bridge plug end (3) is provided with a docking screw hole (304), which is perpendicular to the left end face of the bridge plug end (3). The spiral sleeve (101) is movably connected inside the end docking socket (302), and the sleeve external thread (102) is spirally connected with the end socket internal thread (303).

8. The combined petroleum bridge plug according to claim 7, characterized in that: The cross section of the movable support ring (5) is a wedge-shaped structure, the inclined surface of the movable support ring (5) faces the left side, and a support ring positioning hole (501) is opened on the movable support ring (5), and the support ring positioning hole (501) is fixedly connected to the docking screw hole (304) by screws.

9. The combined petroleum bridge plug according to claim 1, characterized in that: The rubber expansion ring (6) is a ring body made of rubber material. The cross section of the rubber expansion ring (6) is a wedge-shaped structure. The inclined surface of the rubber expansion ring (6) faces inward and rightward. The inclined surface of the rubber expansion ring (6) fits the inclined surface of the movable support ring (5). The outer surface of the rubber expansion ring (6) is processed with anti-slip grooves (602).

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