Sleeve cutting device

Abstract

The utility model relates to a casing pipe cutting device which comprises a cutting pipe and at least two cutting knives, a flange is fixed on the inner wall of one end of the cutting pipe, a piston cavity is arranged in the middle of the flange in a penetrating mode, a piston is installed in the piston cavity in a sealing mode, a through hole is formed in the middle of the piston, and the piston is integrally provided with a connecting pipe which is communicated with the through hole. At least two cutter grooves in one-to-one correspondence with the cutters are formed in the pipe wall of the cutting pipe in the circumferential direction at intervals, the cutters are arranged in the cutter grooves in a one-to-one correspondence mode, one ends of the cutters are hinged to the cutter grooves, a thrust ring is arranged on the inner wall of the other end of the cutting pipe, an annular groove is formed in the outer surface of the other end of the connecting pipe, and an elastic piece is arranged between the groove bottom of the annular groove and the thrust ring. One end of the cutting knife is movably connected with the connecting pipe, a cooling cavity is defined between the connecting pipe and the cutting pipe, an inlet communicated with the cooling cavity is formed in the flange, and a flow control valve is arranged at the inlet. The device has the advantages that the device can effectively cut the underground casing pipe, and the cutting knife can be cooled in the cutting process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of petroleum machinery, in particular to a casing cutting device. BACKGROUND

[0002] In the petroleum industry, it is generally necessary to implement well sealing on the oil and gas well without economic value and the safety hazard well needing to be abandoned due to reaching the service life, and then to complete the abandoned well operation. In the abandoned well operation, the casing in the well needs to be cut.

[0003] At present, the internal structure design of the existing casing cutting equipment is relatively complex, and none of them involves cooling the cutting knife during cutting. Therefore, the cutting knife is greatly worn and consumed. The patent technology with the application number "201810884909.6" has the above defects.

[0004] Therefore, the existing casing cutting device needs to be improved and upgraded to simplify the structure and have the cooling function of the cutting knife. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a casing cutting device which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problem is as follows:

[0007] A casing cutting device comprises a cutting pipe and at least two cutting knives. A flange is fixed to the inner wall of one end of the cutting pipe. A piston cavity is arranged in the middle of the flange. A piston is sealingly arranged in the piston cavity. A through hole is arranged in the middle of the piston. The piston is integrally provided with a connecting pipe extending towards the other end of the cutting pipe. The connecting pipe is in communication with the through hole. At least two knife grooves corresponding to the cutting knives are arranged on the wall of the cutting pipe in a circumferential direction. The cutting knives are arranged in the knife grooves one by one. One end of each cutting knife is hingedly connected to the corresponding knife groove. A thrust ring is arranged on the inner wall of the other end of the cutting pipe. An annular groove is arranged on the outer surface of the other end of the connecting pipe. An elastic member is arranged between the groove bottom of the annular groove and the thrust ring. One end of each cutting knife is movably connected to the connecting pipe. The connecting pipe and the cutting pipe form a cooling cavity in communication with the knife grooves. An inlet is arranged on the flange in communication with the cooling cavity. A flow control valve is arranged at the inlet.

[0008] On the basis of the above technical solution, the utility model can be further improved as follows.

[0009] Further, the casing cutting device comprises an upper casing and a lower casing. The other end of the upper casing extends into the inside of one end of the lower casing, and the two are sealingly connected. The flange is fixed to the inner wall of the other end of the upper casing.

[0010] Further, the other end of the upper sleeve is provided with a tapered external thread connection part, and the inner wall of the one end of the lower sleeve is provided with a tapered thread groove, and the other end of the upper sleeve is threadedly connected with the one end of the lower sleeve.

[0011] Further, the orifice of the middle through hole of the piston is provided with a throttle nozzle.

[0012] Further, the inlet is provided with a plurality of inlets and is distributed at intervals around the through hole.

[0013] Further, the side wall of the connecting pipe is provided with a plurality of embedding grooves corresponding to the cutting knives in the circumferential direction, and one end of the cutting knife is provided with a protruding part embedded in the embedding groove.

[0014] Further, the elastic member is a spring.

[0015] Further, the other end of the connecting pipe is provided with an end part with a larger diameter than the body, the end part is in contact with the inner wall of the cutting pipe, and the outer surface of the end part is provided with the ring groove.

[0016] Further, the flow control valve is an electromagnetic valve.

[0017] Further, the cutting knife is provided with two cutting knives.

[0018] The beneficial effects of the utility model are: the structure design is reasonable, the cutting operation of the device and the drill pipe can be ensured to be normal to the downhole casing, and the cooling of the cutting knife can be considered in the cutting process, and the good cutting performance of the cutting knife is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a sectional view of the casing cutting device of the utility model.

[0020] In the drawings, the component list represented by each reference numeral is as follows:

[0021] 1, cutting pipe; 2, cutting knife; 3, piston; 4, flow control valve; 11, flange; 14, knife groove; 15, thrust ring; 16, elastic member; 21, protruding part; 31, connecting pipe; 32, throttle nozzle; 111, upper sleeve; 112, lower sleeve; 311, ring groove; 312, embedding groove; 313, end part. DETAILED DESCRIPTION

[0022] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0023] EMBODIMENT

[0024] As Figure 1As shown, the casing cutting device of the embodiment comprises a cutting tube 1 and at least two cutters 2. An inner wall of one end of the cutting tube 1 is fixed with a flange 11. A piston cavity is formed in the middle of the flange 11. A piston 3 is sealed in the piston cavity. A through hole is formed in the middle of the piston 3. The piston 3 is integrated with a connecting tube 31 extending towards the other end of the cutting tube 1. The connecting tube 31 is communicated with the through hole. At least two cutter grooves 14 corresponding to the cutters 2 are formed in the wall of the cutting tube 1 at intervals in the circumferential direction. The cutters 2 are arranged in the cutter grooves 14 one by one. One end of each cutter 2 is hinged to the cutter groove 14. A thrust ring 15 is arranged on the inner wall of the other end of the cutting tube 1. An annular groove 311 is formed on the outer surface of the other end of the connecting tube 31. An elastic member 16 is arranged between the bottom of the annular groove 311 and the thrust ring 15. One end of each cutter 2 is movably connected to the connecting tube 31. A cooling cavity is formed between the connecting tube 31 and the cutting tube 1 and communicated with the cutter grooves 14. An inlet is formed in the flange 11 and communicated with the cooling cavity. A flow control valve 4 is arranged at the inlet.

[0025] When the casing cutting device of the embodiment is used, one end of the cutting tube 1 is connected to a drill rod, and the other end is inserted into a well. The drill rod drives the cutting tube 1 to rotate during rotation. Meanwhile, drilling fluid is fed into the drill rod. After the drilling fluid reaches the cavity at one end of the cutting tube 1, the piston 3 is pushed to move downwards along the piston cavity due to the small size of the through hole of the piston 3, thereby forming a "pressure build-up". Under the action of the "pressure", the piston 3 is pushed to move downwards along the piston cavity. The other end of the connecting tube 31 connected to the piston 3 drives the cutters 2 to rotate and extend out of the cutter grooves 14 until the cutters 2 extend to the horizontal position (fully expanded). At this time, due to the design of the thrust ring 15, the other end of the connecting tube 31 compresses the elastic member 16. In this state, the cutting tube 1 can be cut around the casing wall by the expanded cutters 2 during the rotation of the cutting tube 1 driven by the drill rod. During the entire cutting process, the flow control valve 4 can be opened to make part of the drilling fluid enter the annular cavity (cooling cavity) between the connecting tube 31 and the cutting tube 1, and then flow out of the cutter grooves 14, thereby cooling the cutters 2. The cooling process can be continuous or intermittent. The entire device has a reasonable structure and can ensure that the device normally cuts the casing in the well after being connected to the drill rod. Meanwhile, the device can also cool the cutters during the cutting process, thereby ensuring the good cutting performance of the cutters.

[0026] It should be noted that after the cutting is completed, the drilling fluid stops being injected, the cavity at one end of the cutting tube 1 loses pressure, the elastic member 16 rebounds, and the connecting tube 31 and the piston 3 are pushed to move back to the original position, thereby making the cutters 2 rotate and shrink into the cutter grooves 14.

[0027] In the embodiment, the sleeve cutting device comprises an upper sleeve 111 and a lower sleeve 112, the other end of the upper sleeve 111 extends into the inside of the one end of the lower sleeve 112, and the two are sealingly connected, and the flange 11 is fixed to the inner wall of the other end of the upper sleeve 111. The split design facilitates the disassembly and assembly of internal components.

[0028] In the embodiment, the other end of the upper sleeve 111 is provided with a tapered external thread connection part, the inner wall of the one end of the lower sleeve 112 is provided with a tapered thread groove, and the other end of the upper sleeve 111 is threadedly connected to the one end of the lower sleeve 112.

[0029] In the embodiment, the orifice of the through hole in the middle of the piston 3 is provided with a throttling nozzle 32. The throttling nozzle 32 can effectively form "pressure holding" in the cavity at the outer end of the piston 3, so as to realize the movement of the piston 3 driven by the drilling fluid, and the deployment of the cutter 2.

[0030] In the embodiment, a plurality of inlets are provided and are distributed at intervals around the through hole. The design of multiple inlets can not only realize mutual backup, but also can adjust the shunt flow according to the injection amount of the drilling fluid, as long as the piston 3 is normally pushed by the drilling fluid and the elastic member 16 is compressed, and the deployment of the cutter 2 during cutting is maintained.

[0031] As a preferred embodiment, a plurality of embedding grooves 312 corresponding to the cutter 2 are provided on the side wall of the connecting pipe 31 in the circumferential direction, and one end of the cutter 2 is provided with a protruding part 21 embedded in the embedding groove 312.

[0032] In the embodiment, the protruding part 21 is always in the embedding groove 312 of the connecting pipe 31, and the top wall of the embedding groove 312 pushes the protruding part 21 to move downward during the downward movement of the connecting pipe 31, thereby driving the one end of the cutter 2 to rotate, so that the cutter 2 is completely deployed and extends out of the cutter groove 14. Generally, the protruding part 21 is located at the lower part of the one end of the cutter 2 in the horizontal state of the cutter 2.

[0033] In the embodiment, the elastic member 16 is a spring.

[0034] As a preferred embodiment, the other end of the connecting pipe 31 is provided with an end part 313 with a diameter larger than the body of the connecting pipe 31, the end part 313 is in contact with the inner wall of the cutting pipe 1, and the outer surface of the end part 313 is provided with the annular groove 311.

[0035] In the embodiment, the size of the end part 313 is consistent with the inner diameter size of the cutting pipe 1, and the two are in contact with each other and slide relative to each other, and the annular groove 311 on the surface of the end part 313 and the inner wall of the cutting pipe 1 always form a relatively sealed cavity, and the elastic member 16 is arranged in the cavity to avoid the entry of the drilling fluid.

[0036] In the embodiment, the flow control valve 4 is an electromagnetic valve. A controller is arranged outside the device, and a line connection joint electrically connected with the flow control valve 4 is rotatably connected to one end of the cutting pipe 1, so that the line connection is facilitated (this part of technology belongs to the conventional wiring mode of the existing drill pipe and downhole electric tool, and will not be described here).

[0037] In the embodiment, the cutting knife 2 is provided with two. The two cutting knives can be distributed on the two sides of the cutting pipe 1.

[0038] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0039] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0040] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0042] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0043] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A bushing cutting device characterized by: The sleeve cutting device comprises a cutting tube (1) and at least two cutting knives (2), one end inner wall of the cutting tube (1) is fixed with a flange (11), a piston cavity is arranged in the middle of the flange (11), a piston (3) is sealedly arranged in the piston cavity, a through hole is arranged in the middle of the piston (3), the piston (3) is integrally provided with a connecting tube (31) extending towards the other end of the cutting tube (1), the connecting tube (31) is communicated with the through hole, at least two knife grooves (14) corresponding to the cutting knives (2) are arranged on the wall of the cutting tube (1) in a circumferential direction, the cutting knives (2) are arranged in the knife grooves (14) in a one-to-one correspondence, one end of the cutting knife (2) is hingedly connected with the knife groove (14), a thrust ring (15) is arranged on the inner wall of the other end of the cutting tube (1), an annular groove (311) is arranged on the outer surface of the other end of the connecting tube (31), an elastic element (16) is arranged between the groove bottom of the annular groove (311) and the thrust ring (15), one end of the cutting knife (2) is movably connected with the connecting tube (31), the connecting tube (31) and the cutting tube (1) form a cooling cavity communicated with the knife grooves (14), an inlet communicated with the cooling cavity is arranged on the flange (11), and a flow control valve (4) is arranged at the inlet.

2. A cutting device according to claim 1, wherein: The sleeve cutting device comprises an upper sleeve (111) and a lower sleeve (112), the other end of the upper sleeve (111) extends into the inside of one end of the lower sleeve (112), and the two are sealingly connected, and the flange (11) is fixed on the inner wall of the other end of the upper sleeve (111).

3. A cutting shoe according to claim 2, wherein: The other end of the upper sleeve (111) is provided with a tapered external thread connection part, the inner wall of one end of the lower sleeve (112) is provided with a tapered thread groove, and the other end of the upper sleeve (111) is threadedly connected with one end of the lower sleeve (112).

4. The apparatus of claim 1 wherein: A throttle nozzle (32) is arranged at the orifice of the through hole in the middle of the piston (3).

5. The apparatus of claim 1 wherein: A plurality of inlets are arranged and distributed in a spaced manner around the through hole.

6. The apparatus of claim 1 wherein: A plurality of embedding grooves (312) corresponding to the cutting knives (2) are arranged on the side wall of the connecting tube (31) in a circumferential direction, and one end of the cutting knife (2) is provided with a protruding part (21) embedded in the embedding groove (312).

7. The apparatus of claim 1 wherein: The elastic element (16) is a spring.

8. The apparatus of claim 1 wherein: The other end of the connecting tube (31) is provided with an end part (313) with a diameter larger than the body, the end part (313) is in contact with the inner wall of the cutting tube (1), and the outer surface of the end part (313) is provided with the annular groove (311).

9. The apparatus of claim 1 wherein: The flow control valve (4) is an electromagnetic valve.

10. A cutting device according to any one of claims 1 to 9, wherein: The cutting knife (2) is provided with two.

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