A novel downhole hot melt cutting tool

Abstract

The application discloses a novel downhole hot melting cutting tool and relates to the technical field of well drilling tools.The downhole hot melting cutting tool comprises an anchoring mechanism, a righting mechanism and a jetting mechanism.The anchoring mechanism is composed of an anchoring outer cylinder, an anchoring piston seat, an anchoring locking block, an anchoring long connecting rod, an anchoring short connecting rod and a spring.The righting mechanism is composed of a liquid guide column, a righting piston, a righting outer cylinder, a righting limiting cylinder, a spoke connecting cylinder and spokes.The jetting mechanism is composed of an igniter, a heat insulation ring, a jetting outer cylinder, a nozzle bolt, a nozzle and a thrust bearing.The hot melting cutting tool is provided, the rotating power of the nozzle of which is provided by a jet flow, the structure is simpler than that of a mechanical rotating cutting structure, a hot melting metal jet flow is used as a cutter to cut a metal pipeline, the cutting efficiency is high, and the abrasion problem caused by a traditional cutting cutter is avoided.

Description

Technical Field

[0001] This invention belongs to the field of drilling tool technology, and specifically relates to a thermo-melting continuous tubing cutting device. Background Technology

[0002] During oil and gas development, factors such as production shocks, geostress, and substandard tubing quality can cause tubing to become damaged and unable to be retrieved normally. Therefore, it is necessary to cut the faulty section of the tubing before retrieval. Downhole cutting technology is a method for cutting faulty tubing. The downhole cutting tool is lowered to the fault location, anchored and straightened, and then the cutting tool is rotated to cut the deformed tubing.

[0003] In practical operations, coiled tubing has become the preferred method for transporting downhole cutting tools due to its ability to be continuously tripped and pulled without the need for individual connections. The efficiency and cost of coiled tubing cutting tools directly determine the well workover cycle and oil production benefits. Traditional mechanical cutting tools wear out severely after multiple operations and require frequent replacement, increasing operating costs and risks. This invention provides a thermal fusion cutting tool whose nozzle rotation is powered by a jet. Compared to mechanical cutting, it has a simpler structure and does not require tool replacement, greatly reducing costs. At the same time, it is highly efficient, safer than explosive cutting, and produces a more regular cut. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and efficient thermal melting downhole tubing cutting tool.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel downhole thermal melting cutting tool includes an anchoring mechanism, a straightening mechanism, and a jetting mechanism. The anchoring mechanism comprises an anchoring outer cylinder 1, an anchoring piston seat 2, an anchoring locking block 3, an anchoring long connecting rod 4, an anchoring short connecting rod 5, and a spring 6. The straightening mechanism comprises a fluid guide column 7, a straightening piston 8, a straightening outer cylinder 9, a straightening limiting cylinder 10, a spoke connecting cylinder 11, and spokes 12. The jetting mechanism comprises an igniter 13, a heat insulation ring 14, a jetting outer cylinder 15, a nozzle bolt 16, a nozzle 17, and a thrust bearing 18. The long rod inside the spoke connecting cylinder 11 is threadedly connected to the nozzle bolt 16, and the nozzle bolt 16 is fitted into the nozzle 17 and the thrust bearing 18. Bearing 18; characterized in that: a reversing channel is provided inside the nozzle, and a thrust bearing 18 is placed at the lower end of the nozzle 17; the nozzle 17 and the thrust bearing 18 are clearance-fitted with the long rod inside the spoke connecting cylinder 11; the anchoring piston seat 2 is internally connected to the anchoring outer cylinder 1 to form an anchoring hydraulic cavity; the lower outer end of the anchoring outer cylinder 1 is threaded and connected to the straightening outer cylinder 9; the straightening outer cylinder 9 and the straightening limiting cylinder 10 are transition-fitted to form a straightening hydraulic cavity; the guide column 7 connects the anchoring hydraulic cavity and the straightening hydraulic cavity; the anchoring locking block 3 is connected to one end of the anchoring long connecting rod 4 and one end of the anchoring short connecting rod 5 by a pin; the downhole thermal melting cutting tool needs to be connected to a bypass valve.

[0007] Preferably, the upper end of the straightening outer cylinder 9 is threadedly connected to the lower end of the anchoring outer cylinder 1, and the straightening piston 8 is threadedly connected to the straightening limiting cylinder 10.

[0008] In the above scheme, the anchoring outer cylinder 1, the straightening piston 8, the straightening outer cylinder 9, and the straightening limiting cylinder 10 constitute the straightening hydraulic chamber.

[0009] Preferably, the upper end of the liquid guiding column 7 is fitted with the anchoring piston seat 2, the middle end is provided with a through hole communicating with the straightening hydraulic cavity, and the lower end is threaded to be connected to the upper end of the spoke connecting cylinder 11.

[0010] In the above scheme, the guide column 7 connects the anchoring hydraulic chamber and the straightening hydraulic chamber, so as to drive the anchoring mechanism and the straightening mechanism simultaneously through a single hydraulic source.

[0011] Preferably, the lower flange of the straightening and limiting cylinder 10 is provided with a hole seat, which is connected to one end of the spoke 12 by a pin, and the other end of the spoke 12 is connected to the spoke connecting cylinder 11.

[0012] In the above scheme, the spokes 12 bend during the filling process of the hydraulic cavity to achieve the straightening function.

[0013] Preferably, the novel downhole thermal melting cutting tool according to claim 1 is characterized in that: an igniter 13 and a heat insulation ring 14 are embedded inside the upper end of the spoke connecting cylinder 11, and the outside is threadedly connected to the jet outer cylinder 15.

[0014] In the above scheme, the igniter 13 ignites and initiates the hot melt cutting, and the heat insulation ring 14 protects the internal parts.

[0015] Preferably, the nozzle 17 is fitted into the nozzle bolt 16 with a clearance fit to the thrust bearing 18, and the nozzle bolt 16 is threadedly connected to the inner rod of the spoke connecting cylinder 11; an eccentric guide groove is formed inside the nozzle 17.

[0016] In the above scheme, the eccentric structure of the guide groove can realize the cutting of the hot melt flow through the internal flow channel while driving the nozzle 17 to rotate.

[0017] Preferably, in the novel downhole thermal melting cutting tool according to claim 1, the heat insulation ring 14 and the nozzle 17 in the spraying mechanism are both made of graphite material, and the spoke connecting cylinder 11, the outer spraying cylinder 15 and the nozzle bolt 16 are all nickel-based high-temperature alloys.

[0018] In the above scheme, high-temperature resistant materials ensure normal operation.

[0019] Preferably, the downhole thermal melting cutting tool needs to be connected to a bypass valve.

[0020] In the above scheme, the bypass valve is pressed down before cutting, and hydraulic fluid enters the device to start anchoring and straightening. After cutting is completed, the bypass valve is lifted, and the anchoring and straightening hydraulic chamber is depressurized and unlocked. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The illustrative examples and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic cross-sectional view of the entire working state of the present invention;

[0024] Figure 2 This is a half-sectional view of the liquid-conducting column of the present invention;

[0025] Figure 3 This is an isometric view of the spoke connecting cylinder of the present invention;

[0026] Figure 4 This is a structural diagram of the nozzle device of the present invention;

[0027] In the picture:

[0028] 1. Anchoring outer cylinder; 2. Anchoring piston seat; 3. Anchoring locking block; 4. Anchoring long connecting rod; 5. Anchoring short connecting rod; 6. Spring; 7. Liquid guide column; 8. Straightening piston; 9. Straightening outer cylinder; 10. Straightening limiting cylinder; 11. Spoke connecting cylinder; 12. Spoke; 13. Ignition device; 14. Heat insulation ring; 15. Spray outer cylinder; 16. Nozzle bolt; 17. Nozzle; 18. Thrust bearing. Detailed Implementation

[0029] The following will refer to the appendices in the embodiments of the present invention. Figures 1-4 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is not intended to limit the present invention or its application or use in any way. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] A novel downhole thermal melting cutting tool includes an anchoring mechanism, a straightening mechanism, and a jetting mechanism. The anchoring mechanism comprises an anchoring outer cylinder 1, an anchoring piston seat 2, an anchoring locking block 3, an anchoring long connecting rod 4, an anchoring short connecting rod 5, and a spring 6. The straightening mechanism comprises a fluid guide column 7, a straightening piston 8, a straightening outer cylinder 9, a straightening limiting cylinder 10, a spoke connecting cylinder 11, and spokes 12. The jetting mechanism comprises an igniter 13, a heat insulation ring 14, a jetting outer cylinder 15, a nozzle bolt 16, a nozzle 17, and a thrust bearing 18. The anchoring piston seat 2 anchors the interior of the outer cylinder 1. An anchoring hydraulic cavity is formed by connecting the outer end of the anchoring outer cylinder 1, which is threaded to the straightening outer cylinder 9 on its lower outer side. The straightening outer cylinder 9 and the straightening limiting cylinder 10 are transitionally fitted to form a straightening hydraulic cavity. The guide column 7 connects the anchoring hydraulic cavity and the straightening hydraulic cavity. The long rod inside the spoke connecting cylinder 11 is threaded to the nozzle bolt 16. The nozzle bolt 16 is fitted into the nozzle 17 and the thrust bearing 18. The nozzle has a reversing channel inside, and the lower end of the nozzle 17 is padded with the thrust bearing 18. The nozzle 17, the thrust bearing 18, and the long rod inside the spoke connecting cylinder 11 are all clearance fits. (See attached...) Figure 1 As shown, the device is connected to a bypass valve. After pressure is applied, the drilling fluid enters the hydraulic chamber of the anchoring section from the upper end channel of the anchoring outer cylinder 1, and as shown in the attached diagram. Figure 2 As shown, the fluid flows into the straightening hydraulic chamber through the internal channels of the guide column 7. The drilling fluid pushes the anchoring piston seat 2 and the straightening piston 8 downward to reach the critical value, thereby causing the anchoring locking block to stick to the tubing to complete the anchoring and the spokes to be squeezed open to complete the straightening.

[0031] Furthermore, after anchoring and straightening, activate igniter 13, and initiate ignition as shown in the attached diagram. Figure 3The fuel filled in the spoke connecting cylinder 11 shown is injected at high temperature through the nozzle at the lower end of the outer injection cylinder 15. Figure 4 The nozzle 17 shown is rotated by the kinetic energy of the jet stream passing through the reversing pipe of the nozzle 17.

[0032] Furthermore, after the cutting is completed, the bypass valve is lifted to depressurize the drilling fluid in the straightening hydraulic chamber and the anchoring hydraulic chamber. Under the action of spring 6, the straightening part and the anchoring part are reset, completing one cutting operation.

[0033] For ease of description, the relative positional relationships of the components in this invention are described based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, left, right, top, bottom, and center, which are based on the instructions attached. Figure 1 The layout method is determined only for the purpose of facilitating and simplifying the description of the present invention, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "fixing", etc., should be interpreted broadly. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A novel downhole thermal melting cutting tool, comprising an anchoring mechanism, a straightening mechanism, and a jetting mechanism; the anchoring mechanism consists of an anchoring outer cylinder (1), an anchoring piston seat (2), an anchoring locking block (3), an anchoring long connecting rod (4), an anchoring short connecting rod (5), and a spring (6); the straightening mechanism consists of a fluid guide column (7), a straightening piston (8), a straightening outer cylinder (9), a straightening limiting cylinder (10), a spoke connecting cylinder (11), and spokes (12); the jetting mechanism consists of an igniter (13), a heat insulation ring (14), a jetting outer cylinder (15), a nozzle bolt (16), a nozzle (17), and a thrust bearing (18); the long rod inside the spoke connecting cylinder (11) is threadedly connected to the nozzle bolt (16), and the nozzle bolt (16) is fitted with the nozzle (17) and the thrust bearing (18) with a clearance fit; characterized in that: The nozzle (17) has a reversing channel inside, and a thrust bearing (18) is placed at the lower end of the nozzle (17). The nozzle (17) and the thrust bearing (18) are all clearance fit with the long rod inside the spoke connecting cylinder (11). The anchoring piston seat (2) is connected to the anchoring outer cylinder (1) to form an anchoring hydraulic cavity. The lower outer end of the anchoring outer cylinder (1) is threaded and threaded to the upper end of the straightening outer cylinder (9). The straightening outer cylinder (9) is transitionally fitted with the straightening limiting cylinder (10) to form a straightening hydraulic cavity. The guide column (7) connects the anchoring hydraulic cavity and the straightening hydraulic cavity. The anchoring locking block (3) is connected to one end of the anchoring long connecting rod (4) and one end of the anchoring short connecting rod (5) with a pin. The downhole hot melt cutting tool needs to be connected to a bypass valve. An eccentric guide groove is opened inside the nozzle (17).

2. The novel downhole thermal melting cutting tool according to claim 1, characterized in that: The centering piston (8) is threadedly connected to the centering limiting cylinder (10).

3. The novel downhole thermal melting cutting tool according to claim 1, characterized in that: The upper end of the liquid guiding column (7) is fitted with the anchoring piston seat (2), the middle end is provided with a through hole that communicates with the straightening hydraulic cavity, and the lower end is threaded to be connected to the upper end of the spoke connecting cylinder (11).

4. A novel downhole thermal melting cutting tool according to claim 1, characterized in that: The lower flange of the centering and limiting cylinder (10) is provided with a hole seat, which is connected to one end of the spoke (12) by a pin, and the other end of the spoke is connected to the spoke connecting cylinder (11).

5. A novel downhole thermal melting cutting tool according to claim 1, characterized in that: The igniter (13) and heat insulation ring (14) are embedded inside the upper end of the spoke connecting cylinder (11), and are threadedly connected to the outer spray cylinder (15) on the outside.

6. A novel downhole thermal melting cutting tool according to claim 1, characterized in that: The heat insulation ring (14) and nozzle (17) in the spray mechanism are made of graphite material, while the spoke connecting cylinder (11), spray outer cylinder (15) and nozzle bolt (16) are made of nickel-based high-temperature alloy.

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