Well logging steel wire underground hydraulic cutting device

Abstract

The utility model discloses an underground hydraulic cutting device for a well logging steel wire. The underground hydraulic cutting device comprises a pipe body, a round hole, threads, a screwing opening, a pipe body notch, a piston, a sealing ring, an outer clamp, a cutter and a bolt. According to the device, the device is screwed on a fishing pipe column, after the fishing pipe column descends to the preset well depth, the pipe column is filled with well completion fluid, a slurry pump is connected, the pump is started, high-pressure fluid flows into the pipe column to flow into a fluid channel in the device and then flows into a circular hole formed in the side edge of the fluid channel, hydraulic pressure is formed on a piston, and the piston moves outwards in the axial direction of the circular hole; the cutter is ejected out, linear damage can be caused to the steel wire in the well, even the steel wire is cut off, a plurality of breakpoints are formed on the steel wire, convenience is brought to use of the salvaging tool, and the salvaging efficiency of the salvaging tool is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well logging wire fishing, in particular to a downhole hydraulic cutting device for logging wire. Background Art

[0002] During the completion and logging of oil and gas wells, logging wires are used to place various downhole test tools. Due to the obstruction of the tools in the wellbore, the wires are pulled off and fall into the well. In order not to affect the oil well production operation, it is necessary to lower the fishing rod, rotate and wrap the logging wire, and then pull it out. Due to the obstruction of the bottom logging tool, the logging wire that falls into the wellbore is distributed disorderly and twisted in the wellbore. Therefore, during the process of lifting the fishing rod, the logging wire often breaks at the place with weak stress. Since the breakpoint is difficult to control, the frequency and difficulty of fishing are increased.

[0003] Therefore, the prior art still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a downhole hydraulic cutting device for logging wire, aiming to solve the problem in the prior art that it is inconvenient to salvage the wire.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, a downhole hydraulic cutting device for logging wire comprises:

[0007] The tube body has a fluid channel inside and is provided with at least two rows of multiple circular holes arranged in a stepped manner, wherein the circular holes are connected to the fluid channel;

[0008] The piston is arranged in the circular hole through a sealing ring and can move axially along the circular hole;

[0009] A cutter is provided on the piston and arranged toward the outside of the tube;

[0010] A plurality of external clips are arranged on the outer wall of the tube body, and every two external clips are arranged oppositely outside a circular hole to form a tube body gap.

[0011] Furthermore, the upper end of the tube body is hollow, and the inner wall is provided with threads.

[0012] Furthermore, the bottom end of the tube body is conical.

[0013] Furthermore, the outer wall of the tube body is provided with a plurality of slots, which are opened outside the circular hole to engage with the external card.

[0014] Furthermore, the outer card is fixed in the card slot by bolts.

[0015] Furthermore, a screw connection is provided on the outer wall of the upper end of the tube body.

[0016] The technical solution adopted by the utility model has the following beneficial effects:

[0017] In the present application, the device is screwed onto the salvage pipe string. When the salvage pipe string is lowered to a predetermined well depth, the pipe string is filled with completion fluid, a mud pump is connected and the pump is turned on, and high-pressure liquid flows into the pipe string into the fluid channel in the device, and then flows into the circular hole set on the side of the fluid channel, forming hydraulic pressure on the piston. The piston moves outward along the axial direction of the circular hole to push out the cutter, thereby causing linear damage to the steel wire in the well, or even cutting it off, thereby causing multiple breakpoints on the steel wire, thereby facilitating the use of salvaging grass and improving the salvage efficiency of salvaging grass. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a downhole hydraulic cutting device for well logging wire provided by the utility model;

[0019] Figure 2 A schematic diagram of the pipe structure of a downhole hydraulic cutting device for well logging wire provided by the utility model;

[0020] Figure 3 A schematic diagram of the structure of the piston part of a downhole hydraulic cutting device for well logging wire provided by the utility model;

[0021] Figure 4 The utility model provides a schematic diagram of the cross-sectional structure of a pipe body of a downhole hydraulic cutting device for a well logging wire.

[0022] 1. Tube body; 3. Thread; 4. Tightening joint; 5. Tube body notch; 6. Piston; 7. Sealing ring; 8. Cutter; 9. External clamp; 10. Bolt; 11. Round hole; 12. Fluid channel; 13. Card slot. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0025] It should also be noted that the same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In this example, see Figure 1-Figure 4 A downhole hydraulic cutting device for logging wire, wherein a pipe body 1 is arranged in a wellbore, a fluid channel 12 is provided inside, and at least two rows of multiple circular holes 11 arranged in a stepped manner are opened, and the circular holes 11 are connected to the fluid channel 12; a piston 6 is arranged in the circular hole 11 through a sealing ring 7 and can move axially along the circular hole 11; a cutter 8 is arranged on the piston 6 and arranged toward the outside of the pipe body 1; a plurality of outer clamps 9 are arranged on the outer wall of the pipe body 1, and every two outer clamps 9 are arranged oppositely outside a circular hole 11 to form a pipe body gap 5.

[0028] When the salvage string 1 is lowered to the predetermined well depth, the completion fluid is filled into the string 1, and the mud pump is connected and turned on. The high-pressure liquid flows into the string 1 to the fluid channel 12 in the device, and then flows to the circular hole 11 set on the side of the fluid channel 12, forming hydraulic pressure on the piston 6. The piston 6 moves outward along the axial direction of the circular hole 11 to push out the cutter 8, which can cause linear damage to the steel wire in the well, or even cut it off, and then cause multiple breakpoints on the steel wire, which is convenient for the use of salvaging and improves the salvage efficiency of salvaging.

[0029] Please note that Figure 1-Figure 4 The upper end of the pipe body 1 is hollow, and the inner wall is provided with a thread 3 for connection with other downhole devices, and the outer wall is also provided with a screw interface 4 for easy clamping in the wellbore, and the bottom end of the pipe body 1 is conical.

[0030] In this example, see Figure 1-Figure 4The outer wall of the tube body 1 is also provided with a plurality of card grooves 13, which are opened outside the circular hole 11 to clamp the outer card 9, and the outer card 9 is fixed in the card groove 13 by bolts 10 to prevent the piston 6 from being hydraulically ejected to the tube body 1, making it difficult to recover. At the same time, the outer card 9 limits the maximum extension of the cutter to facilitate cutting of the steel wire.

[0031] Specifically, the present invention includes the following steps when implemented:

[0032] 1. Installation: Screw the device firmly onto the salvage pipe.

[0033] 2. Operation: Go down into the wellbore, fill the completion fluid into the tubing string every 300 meters. After reaching the predetermined well depth, fill the wellhead tubing string with completion fluid, connect the mud pump and start the pump. When the pump pressure rises to 8MPa, stop the pump immediately. The piston 6 in the high-pressure liquid drive device drives the cutter 8 to extend outward. At the same time, the external card 9 limits the maximum extension of the cutter 8. After multiple cutters 8 are extended, they will linearly damage or even cut off the well logging wire. After stopping the pump, lift the tubing string, and the cutter will automatically retract when it touches the wellbore wall.

[0034] The technical solution adopted by the utility model can linearly damage or even cut off the logging wire at a predetermined well depth during use, and create a breakpoint to facilitate salvage operations, which has the following beneficial effects:

[0035] 1. Practical: It is suitable for auxiliary salvage operations of broken logging wire in the wellbore of oil and gas well completion tubing.

[0036] 2. Low cost: This device can be used to create breakpoints on the logging wire and reduce the number of fishing times.

[0037] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the solutions disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the claims.

Claims

1. A downhole hydraulic cutting device for logging wire, It is characterized in that It includes: The tube body has a fluid channel inside and is provided with at least two rows of multiple circular holes arranged in a stepped manner, wherein the circular holes are connected to the fluid channel; The piston is arranged in the circular hole through a sealing ring and can move axially along the circular hole; A cutter is provided on the piston and arranged toward the outside of the tube; A plurality of external clips are arranged on the outer wall of the tube body, and every two external clips are arranged oppositely outside a circular hole to form a tube body gap.

2. The downhole hydraulic cutting device for logging wire according to claim 1, It is characterized in that The upper end of the tube body is hollow, and the inner wall is provided with threads.

3. The downhole hydraulic cutting device for logging wire according to claim 1, It is characterized in that The bottom end of the tube is conical.

4. The downhole hydraulic cutting device for logging wire according to claim 1, It is characterized in that The outer wall of the tube body is also provided with a plurality of clamping grooves, which are opened outside the circular hole to clamp the external clamp.

5. The downhole hydraulic cutting device for logging wire according to claim 4, It is characterized in that The outer card is fixed in the card slot by bolts.

6. The downhole hydraulic cutting device for logging wire according to claim 1, It is characterized in that A screw connection is also provided on the outer wall of the upper end of the tube body.

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