Corrosion detection device for underground oil casing

Abstract

The utility model relates to the technical field of oil casing detection, and discloses a corrosion detection device of an underground oil casing, which comprises a round sleeve, the round sleeve is cut into a first half sleeve and a second half sleeve which correspond to each other, and an upper clamp and a lower clamp which are symmetrical are fixedly mounted on the upper side and the lower side of the round sleeve respectively. Caulking grooves are formed in the butt joint positions of the corresponding upper clamping hoops on the two sides, clamping plates are connected into the caulking grooves in an embedded mode, limiting installation assemblies are arranged on the outer side faces of the first half sleeve and the second half sleeve in an array mode, and a plurality of gaskets corresponding to the limiting installation assemblies are arranged on the outer side of the first half sleeve. A limiting rod is pressed to the bottom along a limiting groove, then a rotating column is screwed to drive the limiting rod to rotate and extrude the inclined face of a stop block, the stop block can be driven to compress a compression spring, then the compression spring can drive the stop block to reset, the limiting rod is limited, and then a gasket is installed and attached to the outer side of a round sleeve. Therefore, bolts can be replaced for limiting, and mounting and dismounting by operators are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of oil casing detection, in particular to a corrosion detection device for downhole oil casings. Background Technique

[0002] The downhole oil casing is the last layer of casing in the oil and gas well casing program. Its function is to serve as a passage for oil and gas to reach the ground, and at the same time isolate the oil and gas from all strata to ensure that the oil and gas pressure does not leak. In order to avoid its corrosion and leakage, it is necessary to conduct corrosion detection on it.

[0003] As disclosed in a Chinese patent with the publication number CN217717434U, a corrosion detection device for downhole oil casings includes a cylindrical main body. The cylindrical main body is detachably connected by two identical semi-cylindrical clamps with the same structure. A non-metallic flexible gasket is arranged on the inner wall of the clamp; several rows of bosses are circumferentially and spacedly distributed on the outer wall of the clamp, and metal coupons are detachably connected to the bosses. Among them, at least two metal coupons are arranged side by side in contact for galvanic corrosion detection. In this utility model, the metal coupons are detachably connected to the bosses, which can achieve quick disassembly. And after being connected by the bosses, there is a gap with the clamp, thus ensuring that the metal coupons can be completely corroded. The metal coupons can be used for the corrosion detection of multiple different metal coupons through spaced arrangement, and two metal coupons are arranged side by side in contact for galvanic corrosion detection, which simplifies the overall structure and makes the structure of this utility model simpler while being convenient for loading and unloading.

[0004] In the process of implementing this application, the inventor found that there are at least the following problems in this technology: Although the above technical solution can be used for the galvanic corrosion detection of multiple metal coupons, its connection method is fixed by bolts. When connecting or disassembling, the bolts need to be turned back and forth. Moreover, after the bolt threads are corroded, it will be difficult to unscrew the bolts, which is not convenient for the staff to perform operation and detection. Therefore, further improvement can be made. Content of the Utility Model

[0005] To solve the above-mentioned problems, the utility model provides the following technical solution: A corrosion detection device for downhole oil casings includes a circular sleeve. The circular sleeve is cut into two corresponding semi-sleeves one and semi-sleeve two. Upper clamps and lower clamps that are symmetrically arranged are respectively fixedly installed on the upper and lower sides of the semi-sleeve one and semi-sleeve two. And the upper clamps and lower clamps are both semi-circular. An embedding groove is opened at the butt joint of the corresponding upper clamps on both sides. A clamping plate is embedded in the embedding groove. A limiting installation component is arranged in an array on the outer side surfaces of the semi-sleeve one and semi-sleeve two. A plurality of gaskets are arranged on the outer side of the semi-sleeve one corresponding to the limiting installation component, and the gaskets are attached and installed on the outer sides of the circular sleeve and the gaskets through the limiting installation component.

[0006] As an optimization, a rubber layer is provided on the inner wall surface of the slot, and the clamping plate is in close contact with the rubber layer on the inner wall of the slot. By inserting the clamping plate into the slot, the clamping plate and the rubber layer will be in close contact, and then it will be firmly embedded inside the slot, so that the two semi-sleeves on both sides, namely semi-sleeve one and semi-sleeve two, can be butt-jointed and installed together, facilitating installation and disassembly.

[0007] As an optimization, a pinching groove part is formed in the middle of the clamping plate, and a notch is formed in the middle of the slot. Through the notch, it is convenient to insert the finger and pinch both sides of the pinching groove part, and then it is convenient to pull out and disassemble the clamping plate.

[0008] As an optimization, the limit installation component includes a fixed cylinder fixedly installed on the outer side of the circular sleeve. Two groups of symmetrically arranged limit grooves are formed on the outer side of the fixed cylinder. A turntable is rotatably connected inside the fixed cylinder. A rotating column is fixedly installed at the center of the front surface of the turntable. A limit rod is fixedly installed on one side of the back surface of the turntable. A sliding groove is formed in the bottom of the wall of the limit groove, and a spring pin is arranged inside the sliding groove.

[0009] As an optimization, the limit groove is in an "L" shape. The limit rod is movably clamped into the bottom of the limit groove, and the limit rod protrudes outside the fixed cylinder and abuts against the surface of the gasket. The spring pin blocks at the angle of the limit groove. By inserting the limit rod into the fixed cylinder along the limit groove and then rotating the rotating column to drive the limit rod to squeeze the spring pin and clamp it into the bottom of the limit groove, the limit function on the gasket can be realized instead of a bolt, which is convenient for the staff to install or disassemble the gasket.

[0010] As an optimization, the spring pin includes a base fixedly installed at the bottom of the sliding groove. A compression spring is fixedly installed on the surface of the base. A stop block is fixedly installed at the top of the compression spring, and the stop block is slidably connected inside the sliding groove.

[0011] As an optimization, the cross section of the stop block is trapezoidal. Before rotation, the limit rod presses against and fits the inclined surface side of the stop block. By rotating the limit rod, the inclined surface of the stop block will be squeezed, and then the stop block will be driven to slide downward along the sliding groove, and at the same time, the compression spring will be compressed, so as to facilitate the rotation of the limit rod into the bottom of the limit groove, and then the stop block will be driven to reset by the compression spring to limit the limit rod.

[0012] The beneficial effects of the present utility model are:

[0013] 1. For the corrosion detection device of the downhole oil casing, by pressing the limit rod along the limit groove to the bottom and then rotating the rotating column to drive the limit rod to rotate and squeeze the inclined surface of the stop block, the stop block can be driven to compress the compression spring, and then the stop block will be driven to reset by the compression spring, so as to limit the limit rod, and then the gasket can be installed and fitted on the outer side of the circular sleeve, thus being able to replace the bolt for limiting, which is convenient for the operator to install and disassemble.

[0014] 2. For the corrosion detection device of the downhole oil casing, by docking the semi-sleeves I and II on both sides together and then inserting the clamping plate into the slot, the circular sleeve can be assembled. Then, the circular sleeve can be tightly held outside the oil casing and lowered into the well for detection. When disassembling, by pinching both sides of the pinching groove with two fingers, the clamping plate can be pulled outwards, and then the circular sleeve can be removed from the oil casing, thus facilitating installation and disassembly. Description of the Drawings

[0015] Figure 1 It is a schematic structural view of the present utility model;

[0016] Figure 2 It is a schematic docking structural view of the present utility model;

[0017] Figure 3 It is a schematic limiting installation structural view of the present utility model;

[0018] Figure 4 It is a schematic spring pin structural view of the present utility model.

[0019] In the figure: 1. Semi-sleeve I; 2. Semi-sleeve II; 3. Upper clamp; 4. Lower clamp; 5. Slot; 6. Clamping plate; 7. Limiting installation assembly; 8. Gasket; 9. Pinching groove part; 10. Notch; 11. Fixed cylinder; 12. Limiting groove; 13. Turntable; 14. Rotating column; 15. Limiting rod; 16. Base; 17. Compression spring; 18. Stopper. Detailed Embodiment

[0020] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figure 1-2, a corrosion detection device for downhole oil casing pipes, comprising a circular sleeve which is cut into two corresponding semi-sleeves 1 and 2. Symmetric upper clamps 3 and lower clamps 4 are fixedly installed on the upper and lower sides of the semi-sleeves 1 and 2 respectively, and both the upper clamps 3 and the lower clamps 4 are semi-circular. An embedding groove 5 is opened at the butt joint of the corresponding upper clamps 3 on both sides. A rubber layer is provided on the inner wall surface of the embedding groove 5. A clamping plate 6 is embedded in the embedding groove 5. The clamping plate 6 is in close contact with the rubber layer on the inner wall of the embedding groove 5. By inserting the clamping plate 6 into the embedding groove 5, the clamping plate 6 and the rubber layer will be in close contact, and then it will be firmly embedded in the embedding groove 5, so that the two semi-sleeves 1 and 2 on both sides can be butt-jointed and installed together, which is convenient for installation and disassembly;

[0023] Please refer to Figure 1-2 , a limiting installation component 7 is arranged in an array on the outer side surfaces of the semi-sleeve 1 and the semi-sleeve 2. A plurality of gaskets 8 are arranged on the outer side of the semi-sleeve 1 corresponding to the limiting installation component 7, and the gaskets 8 are attached and installed on the outer sides of the circular sleeve and the gaskets 8 through the limiting installation component 7. A pinching groove part 9 is opened in the middle of the clamping plate 6, and a notch 10 is opened in the middle of the embedding groove 5. The notch 10 facilitates inserting a finger and pinching both sides of the pinching groove part 9, so as to facilitate pulling out and disassembling the clamping plate 6;

[0024] Please refer to Figure 3-4 , the limiting installation component 7 includes a fixed cylinder 11 fixedly installed on the outer side of the circular sleeve. Two groups of centrally symmetric limiting grooves 12 are opened on the outer side of the fixed cylinder 11. The limiting grooves 12 are in an "L" shape. A turntable 13 is rotatably connected inside the fixed cylinder 11. A rotating column 14 is fixedly installed at the center of the front surface of the turntable 13. A limiting rod 15 is fixedly installed on one side of the back surface of the turntable 13. The limiting rod 15 is movably clamped into the bottom of the limiting groove 12, and the limiting rod 15 protrudes outside the fixed cylinder 11 and abuts against the surface of the gasket 8. A sliding groove is opened in the bottom of the wall of the limiting groove 12, and a spring pin is arranged in the sliding groove. The spring pin blocks at the included angle of the limiting groove 12. By inserting the limiting rod 15 into the fixed cylinder 11 along the limiting groove 12 and then rotating the rotating column 14 to drive the limiting rod 15 to squeeze the spring pin and clamp it into the bottom of the limiting groove 12, the limiting effect on the gasket 8 can be achieved instead of a bolt, which is convenient for the staff to install or disassemble the gasket 8;

[0025] Please refer to Figure 3-4, the spring pin includes a base 16 fixedly installed inside the bottom of the chute. A compression spring 17 is fixedly installed on the surface of the base 16. The top of the compression spring 17 is fixedly installed with a stopper 18, and the stopper 18 is slidably connected inside the chute. The cross-section of the stopper 18 is trapezoidal. Before the limiting rod 15 rotates, it presses against one side of the inclined surface of the stopper 18. When the limiting rod 15 rotates, it will press against the inclined surface of the stopper 18, thereby driving the stopper 18 to slide downward along the chute, and at the same time, it will compress the compression spring 17, so as to facilitate the rotation of the limiting rod 15 into the bottom of the limiting groove 12. Then, the compression spring 17 drives the stopper 18 to reset, and the limiting rod 15 can be limited.

[0026] During use, first butt the half-sleeves 1 on both sides and the half-sleeve 2 together, and then insert the clamping plate 6 into the inside of the insertion groove 5, then the half-sleeves 1 on both sides and the half-sleeve 2 can be assembled together, and then they can be tightened outside the oil casing and lowered into the well for detection. At the same time, buckle the gasket 8 on the outside of the fixed cylinder 11, then insert the turntable 13 into the fixed cylinder 11 along the limiting groove 12 with the limiting rod 15, and then rotate the rotating column 14 to drive the limiting rod 15 to rotate, which will press against the inclined surface of the stopper 18, drive the stopper 18 to slide downward along the chute to compress the compression spring 17 until the limiting rod 15 rotates into the bottom of the limiting groove 12. After that, the compression spring 17 will drive the stopper 18 to reset, thereby limiting the limiting rod 15 and making the gasket 8 be installed and fitted on the outside of the circular sleeve;

[0027] After the detection is completed, by pressing the stopper 18 into the chute and then pinching the rotating column 14 and screwing it reversely, the limiting rod 15 can be rotated out. Then, pulling the rotating column 14 outwards can pull out the limiting rod 15, and then it will no longer play a role in limiting the installation of the gasket 8. At this time, it is convenient to remove the gasket 8, and then by pinching the pinch groove part 9, the clamping plate 6 can be pulled outwards, so as to facilitate installation and disassembly.

[0028] In summary, for the corrosion detection device of the downhole oil casing, by pressing the limiting rod 15 along the limiting groove 12 to the bottom and then rotating the rotating column 14 to drive the limiting rod 15 to rotate and press against the inclined surface of the stopper 18, the stopper 18 can be driven to compress the compression spring 17. Then, the compression spring 17 will drive the stopper 18 to reset, thereby limiting the limiting rod 15, and then the gasket 8 will be installed and fitted on the outside of the circular sleeve, so as to be able to replace the bolt for limiting and facilitate the operator for installation and disassembly.

[0029] By docking the half sleeve one 1 and the half sleeve two 2 on both sides together and then inserting the clamping plate 6 into the slot 5, the circular sleeve can be assembled. Furthermore, the circular sleeve can be made to tightly hold the outside of the oil casing and enter the well for detection. When disassembling, by pinching both sides of the pinching groove portion 9 with two fingers, the clamping plate 6 can be pulled outwards, and then the circular sleeve can be removed from the oil casing, thus facilitating installation and disassembly.

[0030] In the description of the present invention, unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can be customized according to the description of the specification and the drawings.

[0032] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. Corrosion detection device for downhole oil casing and tubing, comprising a circular sleeve, the circular sleeve being cut into two corresponding half sleeves one (1) and half sleeve two (2), characterized in that: Symmetric upper clamps (3) and lower clamps (4) are fixedly installed on the upper and lower sides of the first half sleeve (1) and the second half sleeve (2) respectively. Both the upper clamp (3) and the lower clamp (4) are semi-circular. An embedding groove (5) is provided at the butt joint of the corresponding upper clamps (3) on both sides. A clamping plate (6) is embedded in the embedding groove (5). A limiting and mounting assembly (7) is arranged in an array on the outer side surfaces of the first half sleeve (1) and the second half sleeve (2). A number of gaskets (8) are arranged on the outer side of the first half sleeve (1) corresponding to the limiting and mounting assembly (7). And the gaskets (8) are fitted and installed on the outer sides of the circular sleeve and the gaskets (8) through the limiting and mounting assembly (7).

2. The corrosion detection device for downhole oil casing according to claim 1, characterized in that: A rubber layer is provided on the inner wall surface of the embedding groove (5), and the clamping plate (6) is in close contact with the rubber layer on the inner wall of the embedding groove (5).

3. The corrosion detection device for downhole oil casing according to claim 1, characterized in that: A pinching groove part (9) is provided in the middle of the clamping plate (6), and a notch (10) is provided in the middle of the embedding groove (5).

4. The corrosion detection device for downhole oil casing according to claim 1, wherein: The limiting and mounting assembly (7) includes a fixed cylinder (11) fixedly installed on the outer side of the circular sleeve. Two groups of centrally symmetric limiting grooves (12) are provided on the outer side of the fixed cylinder (11). A turntable (13) is rotatably connected inside the fixed cylinder (11). A rotating column (14) is fixedly installed at the center of the front surface of the turntable (13). A limiting rod (15) is fixedly installed on one side of the back surface of the turntable (13). A sliding groove is provided at the bottom of the wall of the limiting groove (12), and a spring pin is arranged in the sliding groove.

5. The corrosion detection device for downhole oil casing according to claim 4, characterized in that: The limiting groove (12) is in an "L" shape. The limiting rod (15) is movably clamped into the bottom of the limiting groove (12), and the limiting rod (15) protrudes out of the outer side of the fixed cylinder (11) and abuts against the surface of the gasket (8). The spring pin blocks at the included angle of the limiting groove (12).

6. The corrosion detection device for downhole oil casing according to claim 5, wherein: The spring pin includes a base (16) fixedly installed at the bottom of the sliding groove. A compression spring (17) is fixedly installed on the surface of the base (16). A stopper (18) is fixedly installed at the top of the compression spring (17), and the stopper (18) is slidably connected inside the sliding groove.

7. The corrosion detection device for downhole oil casing according to claim 6, characterized in that: The cross section of the stopper (18) is trapezoidal, and the limiting rod (15) presses against and fits the inclined surface side of the stopper (18) before rotation.

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