A metal pipe hot-melt cutting device used in a pressure environment

Abstract

The present invention discloses a hot-melt cutting device for metal tubing in a pressurized environment. The device comprises a control housing, a control nipple, an insulating filler, a gas cylinder, a high-pressure inert gas, a high-pressure solenoid valve, a check valve, a baffle, a spring, a ceramic insulating valve, a graphite insulation layer, a tool housing, graphite, an ignition charge, a nozzle structure, a sealing sleeve, and a recovery rod. The right end of the control housing is threadedly connected to the tool housing, which in turn is threadedly connected to the nozzle structure. The sealing ring on the nozzle structure and the sealing ring on the recovery rod simultaneously secure the sealing sleeve. Electrical wires from the control nipple pass sequentially through the gaps between the insulating filler, the gas cylinder, and the control housing. One wire connects to the high-pressure solenoid valve, which in turn connects to the check valve. The check valve connects to the ceramic insulating valve via a baffle and spring. Another wire passes through the gap between the baffle and the control housing and through a hole between the graphite insulation layer and the ignition charge to control the ignition charge. The present invention achieves pressurization through the thermal expansion of the inert gas, improving the tool's operational capabilities in high-pressure deep well environments.

Description

Technical Field

[0001] The invention relates to a transverse melting tool, in particular to a metal pipe column hot melting cutting device used in a pressure environment, and belongs to the field of mechanical engineering or combustion technology. Background Art

[0002] Various downhole accidents are inevitable during drilling, delaying exploration and development progress. Drilling accidents vary, including stuck pipe due to suction, stuck pipe due to collapse, stuck pipe due to sand bridges, stuck pipe due to reduced diameter, and drill bit breakage. Collapse stuck pipe is the most serious of these accidents. This is because handling a stuck pipe due to collapse is time-consuming and labor-intensive, and improper handling can lead to wellbore failure. Currently, traditional methods are still commonly used on-site to release stuck pipe. If the stuck pipe string cannot be released after direct lifting using a lifting device or using other methods such as active lifting, a reverse cut is often used. If this still fails, the pipe string is ultimately cut downhole and then directly pulled out of the wellbore. Current cutting methods include explosive cutting, hydraulic cutting, chemical cutting, and mechanical cutting. Explosive cutting often involves hazardous materials, and strict approval procedures can delay optimal handling. The high pressure on bit (WOB) in hydraulic cutting can easily break the cutter. Chemical cutting can easily damage surrounding pipe strings. Mechanical cutting has low cutting efficiency. The molten cutting tool uses thermite reaction to radially spray the high-temperature molten metal generated onto the inner wall of the drill pipe for cutting. Summary of the Invention

[0003] The purpose of the present invention is to provide a device using a high-temperature molten drill pipe, which can achieve efficient and safe cutting operations in a small space underground.

[0004] The technical solution used in the present invention is:

[0005] A hot-melt cutting device for metal pipes used in pressurized environments primarily comprises a control housing, a control nipple, insulation filler, a gas cylinder, high-pressure inert gas, a high-pressure solenoid valve, a check valve, a baffle, a spring, a ceramic insulation valve, a graphite insulation layer, a tool housing, graphite, an ignition charge, a nozzle structure, a sealing sleeve, and a recovery rod. The device is characterized in that the control nipple controls the opening and closing of the high-pressure solenoid valve and the ignition charge. When the tool is not in operation, the control nipple controls the high-pressure solenoid valve, allowing the high-pressure inert gas in the gas cylinder to flow through the high-pressure solenoid valve and the check valve from the ceramic insulation valve into the reaction charge chamber. The pressure differential causes the sealing sleeve to maintain a seal on the nozzle structure, preventing contamination of the ignition charge by the external environment.

[0006] When the tool is operating in a low-pressure environment, the control nipple controls the high-pressure solenoid valve to allow all the high-pressure inert gas in the gas cylinder to flow out into the reaction chamber. The internal pressure of the tool rises rapidly. The generated pressure causes the copper pin connection between the sealing sleeve and the recovery rod to fail, causing the sealing sleeve to fall off. At this time, ignition begins, and a high-temperature flame accompanies the high-pressure inert gas to flow out of the injection hole.

[0007] When the tool is operating under high pressure, the control sub controls the high-pressure solenoid valve to make the high-pressure inert gas in the gas cylinder flow out to the reaction chamber. At this time, the internal pressure of the tool rises, and the pressure difference between the inside and outside decreases, and ignition begins. The impact caused by the increase in internal pressure of the tool again causes the copper pin connection between the sealing sleeve and the recovery rod to fail, and the sealing sleeve slides down, exposing the injection hole to the outside. As the reagent reaction proceeds, the control sub controls the high-pressure solenoid valve to make all the high-pressure inert gas in the gas cylinder flow out, further pushing the ignition charge reactants and the generated high-temperature flame away from one end of the injection hole toward the injection hole, thereby maximizing the high-temperature melting and cutting of the drill string to complete the processing operation.

[0008] The spring connects the baffle and the ceramic insulation valve, and the connecting baffle is fixed. When the gas cylinder sprays out high-pressure inert gas, it pushes the ceramic insulation valve to the right, and the high-pressure inert gas flows toward the ignition charge. At the same time, the graphite insulation layer, ceramic insulation valve and baffle can also prevent the ignition charge from igniting and generating huge heat energy that is transferred to the left side of the tool and the parts are burned, ensuring that the tool can operate normally.

[0009] Compared with the prior art, the metal pipe hot-melt cutting device used in a pressure environment of the present invention has the following technical features: the control nipple controls the internal pressure of the tool by controlling the high-pressure solenoid valve, thereby enhancing the sealing of the cutting tool and ensuring that the internal environment of the tool is not contaminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an overall schematic diagram of a metal pipe hot-melt cutting device used in a pressure environment;

[0011] Figure 2 It is a schematic structural diagram of the high-pressure solenoid valve of the present invention;

[0012] Figure 3 is a schematic diagram of the baffle structure;

[0013] Figure 4 This is a schematic diagram of a ceramic thermal insulation valve.

[0014] In the figure: 1. Control housing, 2. Control short section, 3. Insulation filler, 4. Gas cylinder, 5. High-pressure inert gas, 6. High-pressure solenoid valve, 7. One-way valve, 8. Baffle, 9. Spring, 10. Ceramic insulation valve, 11. Graphite insulation layer, 12. Tool housing, 13. Graphite, 14. Ignition charge column, 15. Nozzle structure, 16. Sealing sleeve, 17. Recovery rod. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figure 1 and Figure 2 As shown, a metal pipe hot-melt cutting device for use in a pressure environment consists of a control housing 1, a control nipple 2, a thermal insulation filler 3, a gas cylinder 4, a high-pressure inert gas 5, a high-pressure solenoid valve 6, a one-way valve 7, a baffle 8, a spring 9, a ceramic thermal insulation valve 10, a graphite thermal insulation layer 11, a tool housing 12, graphite 13, an ignition charge 14, a nozzle structure 15, a sealing sleeve 16, and a recovery rod 17. It is characterized in that: the right end of the control housing 1 is threadedly connected to the tool housing 12, the right end of the tool housing 12 is connected to the nozzle structure 15 with a metal cone surface with a taper of 5°, the sealing sleeve 16 and the nozzle structure 15 are sealed with a metal cone surface with a taper of 5°, the sealing sleeve 16 and the recovery rod 17 are connected with a copper pin, the wires on the control short section 2 pass through the gap between the insulation filler 3, the gas cylinder 4 and the control housing 1 in turn, the wires are connected to the high-pressure solenoid valve 6, the high-pressure solenoid valve 6 is connected to the one-way valve 7, and the one-way valve 7 is connected to the ceramic insulation valve 10 through the baffle 8 and the spring 9.

[0017] The control nipple 2 controls the opening and closing of the high-pressure solenoid valve 6 and the ignition of the ignition charge 14. When the tool is not in operation, the control nipple 2 controls the high-pressure solenoid valve 6 to allow the high-pressure inert gas 5 in the gas cylinder 4 to flow into the reaction chamber through the high-pressure solenoid valve 6 and the one-way valve 7 from the ceramic insulation valve 10. The pressure difference causes the sealing sleeve 16 to seal the tool on the nozzle structure 15 to prevent the external environment from contaminating the ignition charge 14.

[0018] The spring 9 connects the baffle 8 and the ceramic insulation valve 10, and the connected baffle 8 is fixed. When the gas cylinder 4 sprays out the high-pressure inert gas 5, it pushes the ceramic insulation valve 10 to move to the right, and the high-pressure inert gas 5 flows toward the ignition charge 14. At the same time, the graphite insulation layer 11, the ceramic insulation valve 10 and the baffle 8 can also prevent the ignition charge 14 from igniting and generating huge heat energy that is transferred to the left side of the tool and the parts are burned, ensuring that the tool can operate normally.

[0019] The working principle of the control sub when the tool starts downhole operation is as follows:

[0020] The tool processing operation is mainly to cut the drill pipe with high-temperature molten metal. The tool is lowered to a suitable position underground, and the control sub 2 completes the underground positioning of the tool from the ground control terminal. In a low-pressure environment, the control sub 2 first controls the switch of the high-pressure solenoid valve 6 to make the high-pressure inert gas 5 flow from the gas cylinder 4 into the reaction chamber to rapidly increase the internal pressure of the tool, causing the copper pin connection between the sealing sleeve 16 and the recovery rod 17 to fail. The sealing sleeve 16 slides down to expose the injection hole to the outside, and at the same time controls the ignition charge 14 to ignite. The high-pressure inert gas 5 and the high-temperature flame flow out of the injection hole together, increasing the high-temperature impact of the flame on the drill pipe. In a high-pressure environment, the control sub 2 first controls the high-voltage electric valve 6 to open and close. The magnetic valve 6 is switched on and off, causing the high-pressure inert gas 5 to flow from the gas cylinder 4 into the reaction chamber, thereby increasing the internal pressure of the tool. The ignition charge 14 is then controlled to ignite. At this time, the ignition charge 14 reacts to produce a large amount of gas and extremely high temperature. The internal pressure of the tool rises rapidly, causing the copper pin connection between the sealing sleeve 16 and the recovery rod 17 to fail. The sealing sleeve 16 slides down, exposing the injection hole to the outside. As the reagent reaction proceeds, high-temperature melting and cutting of the drill pipe are generated. While the ignition charge is burning, the switch of the high-pressure solenoid valve 6 is opened, causing the high-pressure inert gas 5 to be completely released. The influx of a large amount of gas pushes the high-temperature flame generated by the ignition charge 14 to gather in the direction of the injection hole, accelerating the high-temperature melting cutting of the drill pipe.

[0021] The specific implementation methods described above are used to illustrate this patent rather than to limit the scope of this patent. Any equivalent changes and modifications made by any technician in this field without departing from the concept and principle of this patent are within the scope of protection of this patent system.

Claims

1. A hot melt cutting device for a metal pipe string used in a pressure environment, comprising a control housing (1), a control nipple (2), a heat-insulating filler (3), a gas cylinder (4), a high-pressure inert gas (5), a high-pressure solenoid valve (6), a one-way valve (7), a baffle (8), a spring (9), a ceramic heat-insulating valve (10), a graphite heat-insulating layer (11), a tool housing (12), graphite (13), an ignition charge (14), a nozzle structure (15), a sealing sleeve (16), and a recovery rod (17), characterized in that: The right end of the control housing (1) is connected to the tool housing (12) by thread, the right end of the tool housing (12) is connected to the nozzle structure (15) by a metal cone with a taper of 5°, the sealing sleeve (16) and the nozzle structure (15) are sealed by a metal cone with a taper of 5°, the sealing sleeve (16) and the recovery rod (17) are connected by a copper pin, the wires on the control short section (2) pass through the gap between the heat insulating filler (3), the gas cylinder (4) and the control housing (1) in turn, the wires are connected to the high-pressure solenoid valve (6), the high-pressure solenoid valve (6) is connected to the one-way valve (7), the one-way valve (7) ) is connected to the ceramic insulation valve (10) through a baffle (8) and a spring (9); the control short section (2) controls the switch of the high-pressure electromagnetic valve (6) and the ignition of the ignition charge (14); wherein when the tool is not in operation, the control short section (2) controls the high-pressure electromagnetic valve (6) to allow the high-pressure inert gas (5) in the gas cylinder (4) to flow into the reaction charge cavity from the ceramic insulation valve (10) through the high-pressure electromagnetic valve (6) and the one-way valve (7), and the pressure difference causes the sealing sleeve (16) to seal the tool on the nozzle structure (15) all the time, thereby preventing the external environment from contaminating the ignition charge (14).

2. The hot melt cutting device for metal pipes used in a pressure environment according to claim 1, characterized in that: When the tool is operating in a low-pressure environment, the control short section (2) controls the high-pressure solenoid valve (6) to make the high-pressure inert gas (5) in the gas cylinder (4) all flow out into the reaction chamber, and the pressure inside the tool rises rapidly. The generated pressure causes the copper pin connection between the sealing sleeve (16) and the recovery rod (17) to fail, and the sealing sleeve (16) falls off. At this time, ignition begins, and a high-temperature flame flows out of the injection hole together with the high-pressure inert gas (5).

3. The hot melt cutting device for metal pipes used in a pressure environment according to claim 1, characterized in that: When the tool is operating under high pressure, the control section (2) controls the high pressure solenoid valve (6) to make the high pressure inert gas (5) in the gas cylinder (4) gush out to the reaction chamber. At this time, the internal pressure of the tool rises, and the internal and external pressure difference decreases, and ignition begins. The impact caused by the increase in the internal pressure of the tool again makes the copper pin connection between the sealing sleeve (16) and the recovery rod (17) fail, and the sealing sleeve (16) slides down, exposing the injection hole to the outside. As the agent reaction proceeds, the control section (2) controls the high pressure solenoid valve (6) to make all the high pressure inert gas (5) in the gas cylinder (4) gush out, and further pushes the ignition charge column (14) reactant and the generated high temperature flame away from one end of the injection hole to the injection hole, thereby maximizing the high temperature melting cutting of the drill string and completing the processing operation.

4. The hot melt cutting device for metal pipes used in a pressure environment according to claim 1, characterized in that: The spring (9) connects the baffle (8) and the ceramic insulation valve (10), and the baffle (8) is fixed. When the gas cylinder (4) ejects the high-pressure inert gas (5), the ceramic insulation valve (10) is pushed to the right, and the high-pressure inert gas (5) flows toward the ignition charge (14). At the same time, the graphite insulation layer (11), the ceramic insulation valve (10) and the baffle (8) can also prevent the ignition charge (14) from igniting and generating huge heat energy that is transferred to the left side of the tool and the parts are burned, thereby ensuring that the tool can operate normally.

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