Freezer for freezing temporary plugging of wellhead of oil field

Abstract

The utility model discloses a freezer for freezing temporary plugging of an oil field wellhead, which relates to the technical field of water injection wellhead maintenance and comprises a first semicircular plate, a second semicircular plate arranged on one side of the first semicircular plate and a connecting pipe connected to one side of the second semicircular plate. A lifting plate is inserted into the mounting box, a first through hole is formed in one side of the lifting plate, a telescopic spring is fixedly connected to one side of the mounting box, and the other end of the telescopic spring is fixedly connected with the side plate; by pulling the fixed handle, the inserting rod is far away from the second through hole and the first through hole, limiting on the lifting plate is relieved, the lifting plate slides in the mounting box, the bottom plate makes contact with the ground, the first semicircular plate and the second semicircular plate are convenient to move, and when the height between the well mouth casing and the ground is larger than that of the first semicircular plate, the well mouth casing can be conveniently fixed. And the device is fixed.

Description

TECHNICAL FIELD

[0001] The utility model relates to water injection well mouth maintenance technical field, concretely is a kind of freezer for oilfield well mouth freezing temporary plugging. BACKGROUND

[0002] Well mouth pressure freezing temporary plugging technology utilizes the principle that liquid nitrogen absorbs heat and vaporizes, installs a container (freezer) for containing nitrogen on the well casing, carries out liquid nitrogen cooling, forms solid ice column in oil jacket annulus and oil pipe, temporarily blocks the well mouth, ensures the maintenance of water injection well mouth to be carried out under pressure, thereby simplifies the maintenance process, maintains formation pressure, meets the requirement of zero discharge of pollutants, and reduces maintenance cost.

[0003] The existing Chinese patent (publication number CN216691049U) discloses a freezer for water injection well mouth freezing temporary plugging, which is composed of two semicircular plates and connected and assembled by fasteners, which is convenient for fixing on the well casing, and a sealing rubber strip is arranged on one side of the semicircular plate to improve the sealing between the two semicircular plates and the sealing between the semicircular plate and the surface of the well casing, thereby reducing the leakage of vaporized liquid nitrogen and improving the cooling speed.

[0004] However, the height of the semicircular plate in the above-mentioned design is fixed, and when the height of the well casing and the ground is higher than the height of the semicircular plate, the worker needs to lift the two movable semicircular plates to a certain height before fixing them on the outside of the well casing with fasteners, which is inconvenient and reduces the work efficiency of the worker.

[0005] Therefore, we designed a freezer for oilfield well mouth freezing temporary plugging to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a freezer for oilfield well mouth freezing temporary plugging to solve the problems raised in the background art.

[0007] To solve the above technical problems, the utility model provides a freezer for oilfield well mouth freezing temporary plugging, which comprises a first semicircular plate, a second semicircular plate arranged on one side of the first semicircular plate, and a connecting pipe connected to one side of the second semicircular plate, a mounting box is fixedly installed on one side of the first semicircular plate, a lifting plate is inserted into the mounting box, a first through hole is formed in one side of the lifting plate, an extension spring is fixedly connected to one side of the mounting box, the other end of the extension spring is fixedly connected to a side plate, a plug rod is fixedly connected to one side of the side plate close to the mounting box, and the plug rod is inserted into the first through hole.

[0008] Further, one side of the installation box is fixedly connected with a fixed plate, a round rod is rotatably inserted into the fixed plate, a limit handle is fixedly installed at the top of the round rod, and a limit plate is fixedly installed at the bottom of the round rod.

[0009] Further, one side of the installation box is provided with a second through hole, and the insertion rod is inserted into the installation box through the second through hole.

[0010] Further, one side of the side plate is fixedly connected with a fixed handle, the fixed handle is provided in a "U" shape, and an anti-skid line is integrally formed on the outer side of the fixed handle.

[0011] Further, the number of the fixed plates is two, and the two fixed plates are symmetrically arranged on the two sides of the installation box with the vertical axis of the installation box as the center.

[0012] Further, a temperature sensor fixing seat is fixedly installed on one side of the first semicircular plate.

[0013] Further, an installation plate is fixedly connected to one side of the first semicircular plate, the number of the installation plates is two, one of the installation plates is fixedly connected with the second semicircular plate, a bolt is threadedly inserted into the inside of the installation plate, and the two installation plates are threadedly connected through the bolt.

[0014] Further, a first rotating seat is fixedly installed on one side of the first semicircular plate, a second rotating seat is fixedly connected to one side of the second semicircular plate, a rotating shaft is inserted into the inside of the first rotating seat, and the second rotating seat is sleeved on the outside of the rotating shaft.

[0015] Compared with the prior art, the beneficial effects of the utility model are that when the height of the first semicircular plate is lower than the height difference between the wellhead casing and the ground, the insertion rod is pulled away from the second through hole and the first through hole by pulling the fixed handle, the limit of the lifting plate is released, the lifting plate is slid in the installation box, the bottom plate is in contact with the ground, the first semicircular plate and the second semicircular plate are moved conveniently, the semicircular plates arranged in the first semicircular plate and the second semicircular plate are flush with the top of the wellhead casing, and the device is fixed conveniently.

[0016] Compared with the prior art, the beneficial effects of the utility model are that when the height of the first semicircular plate is lower than the height difference between the wellhead casing and the ground, the insertion rod is pulled away from the second through hole and the first through hole by pulling the fixed handle, the limit of the lifting plate is released, the lifting plate is slid in the installation box, the bottom plate is in contact with the ground, the first semicircular plate and the second semicircular plate are moved conveniently, the semicircular plates arranged in the first semicircular plate and the second semicircular plate are flush with the top of the wellhead casing, and the device is fixed conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the utility model;

[0018] Figure 2 It is the structure schematic view of the side view of the utility model;

[0019] Figure 3 It is the three-dimensional structure schematic view of the installation box and the lifting plate of the utility model;

[0020] Figure 4 It is Figure 3 The enlarged view of A in the middle;

[0021] Figure 5 It is the partial three-dimensional structure schematic view of the installation box of the utility model;

[0022] Figure 6 It is the structure schematic view of the bottom of the bottom plate.

[0023] In the drawing: 1, first semicircular plate; 2, second semicircular plate; 3, connecting pipe; 4, first rotating seat; 5, second rotating seat; 6, installation box; 7, mounting plate; 8, bolt; 9, temperature sensor fixing seat; 10, lifting plate; 11, first through hole; 12, bottom plate; 13, through slot; 14, fixed plate; 15, limiting handle; 16, round rod; 17, limiting plate; 18, plug rod; 19, extension spring; 20, side plate; 21, fixed handle; 22, second through hole. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Please refer to Figures 1-6 The utility model provides a technical scheme: including first semicircular plate 1, set up in first semicircular plate 1 one side's second semicircular plate 2 and connect in second semicircular plate 2 one side's connecting pipe 3, first semicircular plate 1 one side fixed mounting has installation box 6, installation box 6's inside plug connection has lifting plate 10, and the one side of lifting plate 10 is provided with first through hole 11, and the one side of installation box 6 is fixedly connected with extension spring 19, and the other end of extension spring 19 is fixedly connected with side plate 20, and the one side of side plate 20 close to installation box 6 is fixedly connected with plug rod 18, and plug rod 18 is inserted in the inside of first through hole 11, and the one side of installation box 6 is provided with second through hole 22, and plug rod 18 is inserted with installation box 6 through second through hole 22, and the one side of first semicircular plate 1 is fixedly installed with temperature sensor fixing seat 9, and the one side of side plate 20 is fixedly connected with fixed handle 21, and the shape of fixed handle 21 is set as "U" shape, and the outside of fixed handle 21 is provided with integrally formed anti-skid line.

[0026] It should be noted that the first semicircular plate 1 and the second semicircular plate 2 are provided with semicircular plates on the inner top, which facilitates the closure of the cylindrical cavity surrounded by the first semicircular plate 1 and the second semicircular plate 2 and the wellhead casing wall when the gaseous liquid nitrogen is introduced from the connecting pipe 3.

[0027] In specific implementation, after the first semicircular plate 1 and the second semicircular plate 2 are placed on the periphery of the wellhead, when the height of the wellhead casing from the ground is inconsistent, the worker can hold the fixed handle 21 to make the fixed handle 21 drive the side plate 20 to move, and the insertion rod 18 moves away from the lifting plate 10 synchronously with the fixed handle 21 until the insertion rod 18 is separated from the first through hole 11. The worker can make the lifting plate 10 slide in the installation box 6, and make the bottom plate 12 slide to contact the ground. Then, the fixed handle 21 is loosened, the extension spring 19 is deformed to reset, the insertion rod 18 is reinserted into the second through hole 22 and the first through hole 11 to fix the lifting plate 10. Then, the first semicircular plate 1 and the second semicircular plate 2 are moved to the two sides close to the wellhead casing, and the top of the first semicircular plate 1 and the second semicircular plate 2 is provided with a semicircular ring, so that the semicircular ring is located on the top of the wellhead casing.

[0028] Referring to Figure 3 , Figure 4 and Figure 6 , one side of the installation box 6 is fixedly connected with a fixed plate 14, a circular rod 16 is rotatably inserted into the inside of the fixed plate 14, a limit handle 15 is fixedly installed on the top of the circular rod 16, a limit plate 17 is fixedly installed on the bottom of the circular rod 16, a bottom plate 12 is fixedly installed on the bottom of the lifting plate 10, a through slot 13 is formed on one side of the bottom plate 12, and the circular rod 16 is inserted into the inside of the through slot 13. The number of the fixed plates 14 is two, and the two fixed plates 14 are symmetrically arranged on the two sides of the installation box 6 with the vertical axis of the installation box 6 as the center.

[0029] By arranging the limit plate 17, when the limit plate 17 is aligned with the through slot 13, the limit of the bottom plate 12 is released, which facilitates the movement of the lifting plate 10. When the limit handle 15 is rotated, the circular rod 16 rotates in the inside of the fixed plate 14 and the through slot 13. When the limit plate 17 is rotated to be perpendicular to the through slot 13, the bottom plate 12 is limited. When the first semicircular plate 1 and the second semicircular plate 2 are removed from the wellhead casing, and the first semicircular plate 1 and the second semicircular plate 2 are carried away, the lifting plate 10 is fixed in the inside of the installation box 6, which improves the stability of the lifting plate 10 during carrying.

[0030] Referring to Figure 1 , one side of the first semicircular plate 1 is fixedly connected with an installation plate 7, the number of the installation plates 7 is two, one of the installation plates 7 is fixedly connected with the second semicircular plate 2, a bolt 8 is threadedly inserted into the inside of the installation plate 7, and the two installation plates 7 are threadedly connected through the bolt 8.

[0031] By setting the mounting plate 7, two mounting plates 7 are respectively arranged on the opposite side of the first semicircular plate 1 and the second semicircular plate 2, then the two mounting plates 7 are close, the bolt 8 is screwed into the threaded hole on the mounting plate 7, the first semicircular plate 1 and the second semicircular plate 2 are clamped and fixed, then the gaseous liquid nitrogen is introduced into the cylindrical cavity surrounded by the first semicircular plate 1 and the second semicircular plate 2 through the connecting pipe 3, and the oil field wellhead is frozen and temporarily blocked.

[0032] Referring to Figure 2 , a first rotating seat 4 is fixedly installed on one side of the first semicircular plate 1, a second rotating seat 5 is fixedly connected to one side of the second semicircular plate 2, a rotating shaft is inserted into the first rotating seat 4, and the second rotating seat 5 is sleeved on the outer side of the rotating shaft.

[0033] By setting the first rotating seat 4 and the second rotating seat 5, the rotating shaft is commonly inserted into the first rotating seat 4 and the second rotating seat 5, so that the first rotating seat 4 and the second rotating seat 5 can be rotated, and the first semicircular plate 1 and the second semicircular plate 2 can be rotated.

[0034] Working principle: when the device is used, the first semicircular plate 1 and the second semicircular plate 2 are placed outside the wellhead, when the heights of the wellhead casings from the ground are inconsistent, the limiting handle 15 can be rotated, the limiting plate 17 perpendicular to the through groove 13 is rotated to be aligned with the through groove 13, the limiting of the through groove 13 by the fixed plate 14 is released, then the worker can hold the fixed handle 21, the fixed handle 21 drives the side plate 20 to move, the insertion rod 18 moves away from the lifting plate 10 synchronously with the fixed handle 21, until the insertion rod 18 is separated from the first through hole 11, the worker can slide the lifting plate 10 in the mounting box 6, the bottom plate 12 is slid to be in contact with the ground, then the fixed handle 21 is loosened, the extension spring 19 is deformed to be reset, the insertion rod 18 is inserted into the second through hole 22 and the first through hole 11 again, the lifting plate 10 is fixed, then the first semicircular plate 1 and the second semicircular plate 2 are moved to be close to the two sides of the wellhead casing, the top of the first semicircular plate 1 and the second semicircular plate 2 is provided with a semicircular ring, the semicircular ring is located at the top of the wellhead casing, then the two mounting plates 7 are close, the bolt 8 is screwed into the threaded hole on the mounting plate 7, the first semicircular plate 1 and the second semicircular plate 2 are clamped and fixed, then the gaseous liquid nitrogen is introduced into the cylindrical cavity surrounded by the first semicircular plate 1 and the second semicircular plate 2 through the connecting pipe 3, and the oil field wellhead is frozen and temporarily blocked.

[0035] The above is only an embodiment of the present application, and does not limit the patent, scope, etc. of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A freezer for oilfield wellhead freezing temporary plugging, comprising a first semicircular plate (1), a second semicircular plate (2) arranged on one side of the first semicircular plate (1), and a connecting pipe (3) connected on one side of the second semicircular plate (2), characterized in that: One side of the first semicircle plate (1) is fixedly installed with a mounting box (6), the inside of the mounting box (6) is inserted with a lifting plate (10), one side of the lifting plate (10) is provided with a first through hole (11), one side of the mounting box (6) is fixedly connected with a telescopic spring (19), the other end of the telescopic spring (19) is fixedly connected with a side plate (20), one side of the side plate (20) close to the mounting box (6) is fixedly connected with a plug rod (18), the plug rod (18) is inserted in the inside of the first through hole (11).

2. A freezer for use in oilfield wellhead freeze plugging as defined in claim 1, wherein: One side of the mounting box (6) is fixedly connected with a fixed plate (14), the inside of the fixed plate (14) is rotatably inserted with a round rod (16), the top of the round rod (16) is fixedly installed with a limit handle (15), the bottom of the round rod (16) is fixedly installed with a limit plate (17), the bottom of the lifting plate (10) is fixedly installed with a bottom plate (12), one side of the bottom plate (12) is provided with a through slot (13), the round rod (16) is inserted in the inside of the through slot (13).

3. A freezer for use in oilfield freeze plugging of wellheads as defined in claim 2, characterized in that: One side of the mounting box (6) is provided with a second through hole (22), the plug rod (18) is inserted with the mounting box (6) through the second through hole (22).

4. A freezer for use in oilfield freeze plugging of wellheads as defined in claim 3, characterized in that: One side of the side plate (20) is fixedly connected with a fixed handle (21), the shape of the fixed handle (21) is set as "U" shape, the outside of the fixed handle (21) is provided with an integrally formed anti-skid line.

5. A freezer for use in oilfield freeze plugging of wellheads as defined in claim 4, wherein: The number of the fixed plate (14) is two, the two fixed plates (14) are symmetrically arranged on both sides of the mounting box (6) with the vertical axis of the mounting box (6) as the center.

6. A freezer for use in freeze plugging an oilfield wellhead as defined in claim 5, wherein: One side of the first semicircle plate (1) is fixedly installed with a temperature sensor fixing seat (9).

7. A freezer for use in freeze plugging an oilfield wellhead as defined in claim 6, wherein: One side of the first semicircle plate (1) is fixedly connected with a mounting plate (7), the number of the mounting plate (7) is two, one of the mounting plate (7) is fixedly connected with the second semicircle plate (2), the inside of the mounting plate (7) is threadedly inserted with a bolt (8), the two mounting plates (7) are threadedly connected through the bolt (8).

8. A freezer for use in oilfield freeze plugging of wellheads as defined in claim 7, characterized in that: One side of the first semicircle plate (1) is fixedly installed with a first rotating seat (4), one side of the second semicircle plate (2) is fixedly connected with a second rotating seat (5), the inside of the first rotating seat (4) is inserted with a rotating shaft, the second rotating seat (5) is sleeved on the outside of the rotating shaft.

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