Ring cutting device for jam release of deep well oil pipe

Abstract

The invention discloses an annular cutting device for jam release of a deep well tubing, and relates to the technical field of petroleum downhole cutting equipment.The annular cutting device comprises an ignition unit, a main body unit and a spray head unit which can be detachably connected in sequence, energetic agents are placed in the ignition unit and the upper portion in the main body unit, and the ignition unit can ignite the energetic agents; a plurality of runners capable of being communicated with the outside are arranged on the side wall of the spray head unit, a sealing plug is arranged in the spray head unit, the sealing plug can block the runners before the molten jet flows enter the spray head unit, and the sealing plug can block the runners after the molten jet flows enter the spray head unit. The sealing plug can move downwards under the action of pressure and ablation, the runner is exposed, and the runner is used for ejecting molten jet flow out. Sealing and cutting effects can be guaranteed, and reliability and interchangeability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole petroleum cutting equipment, in particular to a ring cutting device for unblocking deep well oil pipes. Background Art

[0002] In oil and gas well production operations, tubing string stuck is one of the most common and challenging problems. Therefore, only by solving stuck accidents reasonably and efficiently can we reduce economic losses as much as possible and ensure the orderly progress of production. When stuck accidents occur deep underground, they usually face complex working conditions such as high temperature, mud flow, and pressure changes, which puts a great test on the performance and reliability of underground unstuck equipment.

[0003] Pyrotechnic cutting is a new downhole cutting technology that uses pyrotechnic powder to burn in a specific device and spray out high-temperature, high-pressure jets, thereby achieving continuous flushing, ablation and cutting of the target. For example, Chinese patent CN200320108143.1 provides a hot pipe cutter, the main structural feature of which is that the bottom of the inner cavity of the cylindrical shell is sealed by a piston, and the shell between the piston and the bottom surface of the inner cavity is circumferentially opened with a number of through holes, and the bottom surface of the inner cavity is also provided with a discharge hole. When working, the plug descends under the action of high pressure, and the well fluid, air, etc. in the lower part of the inner cavity are discharged from the discharge hole, and the high-temperature fluid is sprayed onto the pipe through the through hole on the shell to achieve cutting. However, the sealing plug relies on the sealing ring to be fixed in a predetermined position, and the inertial force during the downward movement will increase the risk of the plug falling off; the plug and the sealing ring are in direct contact with the external environment, which is likely to lead to insufficient sealing; and the flood discharge hole is easily blocked in a complex environment, and the plug is blocked from descending, and the expected discharge effect may not be achieved. Furthermore, the patent does not provide a practical ignition solution, nor does it provide a dedicated ignition unit with high interchangeability and reliability. Summary of the invention

[0004] The purpose of the present invention is to provide a ring cutting device for unstuck deep well oil pipes, so as to solve the problems existing in the above-mentioned prior art, ensure the sealing and cutting effects, and improve the reliability and interchangeability.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a ring cutting device for unblocking deep well oil pipes, comprising an ignition unit, a main unit and a nozzle unit which can be detachably connected in sequence, wherein energetic agents are placed in the ignition unit and in the upper part of the main unit, and the ignition unit can ignite the energetic agents, and a molten jet generated by the combustion of the energetic agents can enter the nozzle unit, a plurality of flow channels which can be connected to the outside are arranged on the side wall of the nozzle unit, and a sealing plug is arranged inside the nozzle unit, before the molten jet enters the nozzle unit, the sealing plug can block each of the flow channels, and after the molten jet enters the nozzle unit, the sealing plug can be moved downward and the flow channel can be exposed under the action of pressure and ablation, and the flow channel is used to eject the molten jet.

[0007] Preferably, the nozzle unit includes a nozzle body, the sealing plug and a plug. The nozzle body is hollow inside and open at both ends. The first end of the nozzle body can extend into the second end of the main unit and can be detachably connected to the second end of the main unit. The second end of the nozzle body can be detachably connected to the first end of the plug. Each of the flow channels is fan-shaped, and the flow channels are circumferentially arranged and opened on the side wall in the middle of the nozzle body. The sealing plug is installed inside the nozzle body.

[0008] Preferably, a first step surface is provided on the outer wall of the first end of the nozzle body, the second end of the main unit abuts on the first step surface and is connected to the first end of the nozzle body by a thread; the nozzle body is provided with an outer lining on the outer wall corresponding to each of the flow channels, and the outer lining is provided with an extension opening for exposing the flow channels at the position corresponding to each of the flow channels; a sleeve is provided on the outer periphery of the connection between the nozzle body and the main unit, and a second step surface is provided on the outer wall of the second end of the main unit, and two ends of the sleeve are respectively abutted against the second step surface and one side of the outer lining, and a number of large sealing rings are provided between the inner wall of the sleeve and the outer wall of the nozzle body, and between the inner wall of the sleeve and the outer wall of the main unit.

[0009] Preferably, the first end of the plug extends into the second end of the nozzle body and is threadedly connected to the second end of the nozzle body, and a plurality of middle sealing rings are provided between the inner wall of the nozzle body and the outer wall of the plug; the plug includes a large cylindrical section and a small cylindrical section, the large cylindrical section and the small cylindrical section are transitioned through a conical surface, and the outer wall of the small cylindrical section is provided with a circle of annular grooves for connecting instruments.

[0010] Preferably, the longitudinal section of the sealing plug is H-shaped, and the upper and lower end surfaces of the sealing plug are hollowed out to form a blind hole, and the position of the sealing plug avoiding the blind hole corresponds to the flow channel setting; the first end of the sealing plug is provided with a circle of outer edge, and the outer edge can overlap the step surface of the inner wall of the nozzle body, and a plurality of small sealing rings are provided between the inner wall of the nozzle body and the outer wall of the sealing plug.

[0011] Preferably, the main body unit includes a main torch and several extension torches which are hollow inside and connected in sequence, the main torch includes an internally connected cavity and a drug-carrying cavity, the cavity is connected to the interior of the adjacent nozzle unit, the energetic agent is placed in the drug-carrying cavity, the second end of the ignition unit extends into the drug-carrying cavity and is threadedly connected to the drug-carrying cavity, and the extension torch at the end can be detachably connected to the main torch.

[0012] Preferably, an upper sealing ring is provided between the outer wall of the ignition unit and the inner wall of the drug loading chamber.

[0013] Preferably, the ignition unit includes an outer shell, an inner core and an outer plug, the outer shell is detachably connected to the main unit, the outer plug is threadedly connected to the inner wall of the second end of the outer shell, the inner core is installed in the outer shell, and the second end of the inner core abuts against the outer plug.

[0014] Preferably, the inner core comprises an inner shell, an upper plug, an insulator, an upper electrical component, a heating element, a graphite tube, a graphite sheet, a lower electrical component and a lower plug; the inner shell is limitedly connected to the inner wall of the outer shell, and an O-ring is provided between the outer wall of the inner shell and the inner wall of the outer shell; the inner shell is sleeved on the outer periphery of the graphite tube, and both ends of the inner shell extend out of the two ends of the graphite tube; the graphite tube is used to place the energetic agent; the upper electrical component is installed inside the first end of the inner shell, and the insulator is sleeved on the outer periphery of the upper electrical component; The first end extends out of the first end of the insulator and is limited by a retaining ring, the upper plug is threadedly connected to the inner wall of the first end of the inner shell to limit the insulator and the upper electrical component, the lower electrical component is installed inside the second end of the inner shell, and the lower plug is threadedly connected to the inner wall of the second end of the inner shell to limit the lower electrical component, the graphite sheet is located between the second end of the graphite tube and the lower electrical component, the two ends of the heating element are respectively connected to the upper electrical component and the lower electrical component, and the heating element passes through the energetic agent.

[0015] Preferably, the energetic agent comprises a plurality of agent units stacked in sequence.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The ring cutting device for unblocking deep well oil pipes provided by the present invention has energetic agents placed in the ignition unit and in the upper part of the main unit, and the ignition unit can ignite the energetic agents, and the molten jet generated by the combustion of the energetic agents can enter the nozzle unit, and the side wall of the nozzle unit is provided with a plurality of flow channels that can communicate with the outside world, and the flow channels are fan-shaped to ensure uniform distribution of the fluid in the coverage area, and the nozzle unit is provided with a sealing plug inside, and the sealing plug can block each flow channel before the molten jet enters the nozzle unit, and the hanging sealing plug can isolate the inside of the nozzle unit from the external environment to achieve internal The nozzle unit is provided with an outer lining at the position corresponding to the periphery of the flow channel, which can realize the beam and ensure the cutting efficiency and effect. After the molten jet enters the nozzle unit, the sealing plug can be moved downward and the flow channel can be exposed under the action of pressure and ablation. That is, under the combined action of impact and ablation, the upper part of the sealing plug is rapidly ablated and moved downward, and a molten pool is formed on the upper part of the sealing plug to expose the flow channel, thereby realizing the smooth ejection of the jet. The demand for miniaturized and serialized nozzle products is met, and the above components are integrated, which has the advantages of high integration, good cutting effect and low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a cross-sectional view of the ring cutting device used for unstuck deep well oil pipe in the present invention;

[0020] Figure 2 is a cross-sectional view of an ignition unit in the present invention;

[0021] Figure 3 is a cross-sectional view of the main unit in the present invention;

[0022] Figure 4 is a cross-sectional view of the nozzle unit of the present invention;

[0023] Figure 5 It is a cross-sectional view of the nozzle unit at the flow channel in the present invention;

[0024] In the figure: 100-ignition unit, 200-main unit, 300-nozzle unit, 400-energetic agent, 1-nozzle body, 2-outer lining, 3-sleeve, 4-sealing plug, 5-plug, 6-small sealing ring, 7-large sealing ring, 8-middle sealing ring, 9-flow channel, 10-upper plug, 11-lower plug, 12-upper electrical component, 13-lower electrical component, 14-insulator, 15-graphite tube, 16-graphite sheet, 17-outer plug, 18-outer shell, 19-retaining ring, 20-O-ring, 21-flat head screw, 22-gasket, 23-inner shell, 24-heating element, 25-main torch, 26-cartridge cavity, 27-cavity, 28-trapezoidal connecting rib. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a ring cutting device for unstuck deep well oil pipes, so as to solve the problems existing in the prior art, ensure the sealing and cutting effects, and improve the reliability and interchangeability.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-Figure 5As shown, the present embodiment provides a ring cutting device for unblocking deep well oil pipes, comprising an ignition unit 100, a main unit 200 and a nozzle unit 300 which can be detachably connected in sequence, an energetic agent 400 is placed in the ignition unit 100 and in the upper part of the main unit 200, and the ignition unit 100 can ignite the energetic agent 400, and the molten jet generated by the combustion of the energetic agent 400 can enter the nozzle unit 300, and the side wall of the nozzle unit 300 is provided with a plurality of flow channels 9 which can be connected to the outside, and a sealing plug 4 is provided inside the nozzle unit 300, and before the molten jet enters the nozzle unit 300, the sealing plug 4 can block each flow channel 9, and the hanging sealing plug 4 can The nozzle unit 300 can be isolated from the outside environment to achieve internal pressure balance. The nozzle unit 300 is also provided with an outer lining 2 at a position corresponding to the outer periphery of the flow channel 9. The outer lining 2 can realize beam flow and ensure cutting efficiency and effect. After the molten jet enters the nozzle unit 300, it can make the sealing plug 4 move downward and expose the flow channel 9 under the action of pressure and ablation. That is, under the combined action of impact and ablation, the upper part of the sealing plug 4 is quickly ablated, and a molten pool is formed on the upper part of the sealing plug 4 to expose the flow channel 9, thereby achieving smooth ejection of the jet, meeting the demand for miniaturized and serialized nozzle products, and integrating the above components, which has the advantages of high integration, good cutting effect and low use cost.

[0029] Specifically, the nozzle unit 300 includes a nozzle body 1, a sealing plug 4 and a plug 5. The nozzle body 1 is hollow inside and open at both ends, so as to facilitate the entry of the molten jet. The first end of the nozzle body 1 can extend into the second end of the main unit 200 and be detachably connected to the second end of the main unit 200. The second end of the nozzle body 1 is detachably connected to the first end of the plug 5, so as to facilitate installation and removal. Each flow channel 9 is a fan-shaped radiating from the inside to the outside, and the flow channels 9 are arranged circumferentially and opened on the side wall of the middle part of the nozzle body 1 to ensure uniform distribution of the fluid in the coverage area. The sealing plug 4 is installed inside the nozzle body 1 to seal the inner side of the flow channel 9 through the sealing plug 4, so as to achieve the isolation of the nozzle body 1 inside and outside at the flow channel 9. The number of flow channels 9 is three or four, and the width of the flow channel 9 is 3mm-5mm. At the same time, a trapezoidal connecting rib 28 is formed between adjacent flow channels 9 to maintain an integrated structure, and the slope of the trapezoidal connecting rib 28 is 5-15°. The nozzle body 1 is further provided with four disassembly blind holes on the outer wall below the corresponding flow channel 9 , and the disassembly blind holes are used to connect a disassembly wrench to facilitate the disassembly of the nozzle body 1 .

[0030] The outer wall of the first end of the nozzle body 1 is provided with a first step surface, and the second end of the main unit 200 abuts against the first step surface and is connected to the first end of the nozzle body 1 through a thread, and the connection stability is good; the nozzle body 1 is provided with an outer liner 2 on the outer wall corresponding to each flow channel 9, and the outer liner 2 is connected to the side wall of the nozzle body 1 through screws. The outer liner 2 can realize the beam and ensure the cutting efficiency and effect. The outer liner 2 is provided with an extension port for exposing the flow channel 9 at the position corresponding to each flow channel 9, so as not to form an obstruction to the flow channel 9, thereby ensuring the smooth ejection of the molten jet, and the extension port is also fan-shaped; a sleeve 3 is provided on the periphery of the connection between the nozzle body 1 and the main unit 200 to assist in realizing the nozzle While the main body 1 and the main unit 200 are connected, the sealing of the connection between the two is also improved. One end of the outer lining 2 is limited by the sleeve 3, and the other end of the outer lining 2 is limited by a step surface on the outer wall of the nozzle main body 1. The second end outer wall of the main unit 200 is provided with a second step surface, and the two ends of the sleeve 3 are respectively abutted against the second step surface and one side of the outer lining 2 to improve the connection stability of the sleeve 3. Several large sealing rings 7 are provided between the inner wall of the sleeve 3 and the outer wall of the nozzle main body 1, as well as between the inner wall of the sleeve 3 and the outer wall of the main unit 200. The gaps between the sleeve 3 and the nozzle main body 1, as well as between the sleeve 3 and the main unit 200 are sealed by the large sealing rings 7 to improve the sealing effect.

[0031] The outer lining 2 is made of high temperature resistant materials such as tungsten copper alloy, molybdenum alloy, ceramic, etc.; and the width of the extension port on the outer lining 2 is slightly larger than the width of the flow channel 9 on the nozzle body 1 by 1mm-3mm, thereby preventing the outer lining 2 from breaking during jet impact, and can effectively resist jet ablation, achieving a good beam effect, thereby improving energy utilization and improving the quality of oil pipe cutting.

[0032] The first end of the plug 5 extends into the second end of the nozzle body 1 and is threadedly connected to the second end of the nozzle body 1. The second end of the nozzle body 1 is blocked by the plug 5 to ensure that the molten jet can be ejected through the flow channel 9. A number of middle sealing rings 8 are provided between the inner wall of the nozzle body 1 and the outer wall of the plug 5 to improve the sealing effect; the plug 5 includes a large cylindrical section and a small cylindrical section. The large cylindrical section and the small cylindrical section are transitioned through a conical surface. The angle of the conical surface is 30°-60°. The outer wall of the small cylindrical section is provided with a circle of annular grooves for connecting instruments. The outer wall of the large cylindrical section and the inner wall of the nozzle body 1 are limited by multiple step surfaces. The height from the lower end surface of the flow channel 9 to the inner bottom surface of the plug 5 is greater than the length of the plug 20mm-60mm, so as to form a molten pool and prevent the slag formed by the combustion of the internal charge column from blocking the flow channel 9.

[0033] The longitudinal section of the sealing plug 4 is H-shaped, and the upper and lower end surfaces of the sealing plug 4 are hollowed out to form a blind hole, which can reduce weight and facilitate ablation so that the flow channel 9 connects the nozzle body 1 and the outside world. The position of the sealing plug 4 avoiding the blind hole corresponds to the flow channel 9, achieving a good plugging effect and effectively maintaining the pressure balance inside the nozzle body 1, which is convenient for smooth cutting of the oil pipe when the nozzle body 1 is working; the first end of the sealing plug 4 is provided with a circle of outer edge, the thickness of the outer edge is 1mm-2mm, and the chamfer of the outer edge is 45°. The outer edge can overlap the step surface of the inner wall of the nozzle body 1 to achieve the limitation of the sealing plug 4 and the nozzle body 1. After the molten jet enters the nozzle body 1, the outer edge is ablated, and the sealing plug 4 is pushed downward under the action of pressure to expose the flow channel 9. A number of small sealing rings 6 are provided between the inner wall of the nozzle body 1 and the outer wall of the sealing plug 4 to improve the sealing effect.

[0034] The sealing plug 4 can be made of a material with low melting point, easy ablation, easy melting or vaporization properties, such as aluminum alloy, copper alloy, polyetheretherketone (PEEK), etc.

[0035] The main unit 200 includes a main torch 25 and several extension torches which are hollow inside and connected in sequence. A person skilled in the art can choose whether to connect the extension torches and the number of extension torches to be connected according to the actual working conditions such as the wellbore. The main torch 25 includes an internally connected cavity 27 and a drug-carrying cavity 26. The second end of the ignition unit 100 extends into the drug-carrying cavity 26 and is connected to the drug-carrying cavity 26 by a thread. An energetic agent 400 is placed in the drug-carrying cavity 26 to ensure that the ignition unit 100 can ignite the energetic agent 400 in the drug-carrying cavity 26 when igniting. The cavity 27 is connected to the inside of the adjacent nozzle unit 300 and can adjust the inner cavity pressure to stabilize the ejection speed of the jet. The length of the cavity 27 is preferably 80 mm-150 mm. The extension torch at the end can be detachably connected to the main torch 25. Except that the cavity 27 is no longer left in the extension torch, the other structural settings are consistent with the main torch 25.

[0036] A retaining ring and a cylindrical liner made of tungsten-copper alloy, ceramic, graphite or the like may be added to the interior of the main unit 200 to increase the service life of the main unit 200 .

[0037] An upper sealing ring is provided between the outer wall of the ignition unit 100 and the inner wall of the drug-carrying chamber 26 to improve the sealing effect.

[0038] The ignition unit 100 includes an outer shell 18, an inner core and an outer plug 17. The outer shell 18 and the main unit 200 can be detachably connected. The outer shell 18 plays the role of packaging and connection. The outer plug 17 is threadedly connected to the inner wall of the second end of the outer shell 18. The inner core is installed in the outer shell 18, and the second end of the inner core abuts against the outer plug 17, and then the inner core is limited by the outer plug 17, and the second end of the outer shell 18 is packaged. The outer plug 17 is a circular ring structure, and the outer end is tapped with threads that can cooperate with the internal threads of the second end of the outer shell 18. A straight groove is opened on the second end face of the outer plug 17, which is convenient for connection with tools to realize the disassembly and assembly of the outer plug 17.

[0039] The inner core includes an inner shell 23, an upper plug 10, an insulator 14, an upper electrical component 12, a heating element 24, a graphite tube 15, a graphite sheet 16, a lower electrical component 13 and a lower plug 11. The inner shell 23 is limitedly connected to the inner wall of the outer shell 18, and an O-ring 20 is provided between the outer wall of the inner shell 23 and the inner wall of the outer shell 18, and then the O-ring 20 is used to play a straightening role and avoid shaking. The inner shell 23 is sleeved on the outer periphery of the graphite tube 15, and both ends of the inner shell 23 extend out of the two ends of the graphite tube 15, which is convenient for installing other components. The inner shell 23 is an inner stepped circular tube structure. From the center to the two ends, the inner diameter of the circular tube increases and the wall thickness decreases, thereby forming an annular step. The graphite tube 15 and the inner shell 23 are clearance-matched. The graphite tube 15 is used to place the energetic agent 400. The upper electrical component 12 is installed inside the first end of the inner shell 23, and the outer periphery of the upper electrical component 12 is sleeved with an insulator 14. The two are transitionally matched. The first end of the upper electrical component 12 extends out of the first end of the insulator 14 and is limited by a retaining ring 19 to prevent the upper electrical component 12 from falling out of the inner shell 23. The insulator 14 is a stepped cylinder with a core having a through hole of equal diameter. The insulator 14 The material of the upper plug 10 is preferably ceramic, and the upper plug 10 is threadedly connected to the inner wall of the first end of the inner shell 23 to limit the insulator 14 and the upper electrical component 12. As a preferred embodiment, the outer wall of the insulator 14 is provided with a step surface, and the upper plug 10 is sleeved on a part of the outer wall of the insulator 14 and limited on the step surface of the insulator 14. In addition, the upper end surface of the upper plug 10 is provided with a straight groove, which is convenient for tightening and loosening with a tool. The lower electrical component 13 is installed inside the second end of the inner shell 23, and the lower plug 11 is threadedly connected to the inner wall of the second end of the inner shell 23 to achieve For limiting the position of the lower electrical component 13, the two ends of the lower plug 11 respectively abut against the outer plug 17 and the lower electrical component 13, and a gasket 22 is provided between the lower plug 11 and the lower electrical component 13, the graphite sheet 16 is located between the second end of the graphite tube 15 and the lower electrical component 13, the first end of the heating element 24 is inserted into the small blind hole opened at the lower end of the upper electrical component 12, and is fastened with the flat head screw 21 screwed into the side wall, and after the heating element 24 is straightened and located at the center of the medicine column, the second end of the heating element 24 is locked on the lower electrical component 13 with the gasket 22 and the flat head screw 21. The outer diameter of the cylinder at the lower end of the upper electrical component 12, the inner diameter of the graphite sheet 16, and the inner diameter of the lower electrical component 13 are all equal to the inner diameter of the hollow energetic agent 400.

[0040] When the ignition unit 100 is working, one pole of the power supply device is connected to the upper power component 12, and the other pole is connected to the housing 18, and then connected to the lower power component 13, so as to form a closed loop of the heating element 24, thereby realizing the excitation of the ignition unit 100 and ignition of the energetic agent 400 in the main torch 25, with high reliability and interchangeability. The power supply current of the power supply device is preferably 0.5A-3A.

[0041] Both ends of the heating element 24 are connected to the upper electrical component 12 and the lower electrical component 13 via flat head screws 21 , respectively, and the heating element 24 passes through the energetic agent 400 .

[0042] The material of the upper electrical component 12 is preferably BeQ2 brass, which has good conductivity and strength. The lower electrical component 13 is a disc with a hole in the center. The heating element 24 is a self-wound nickel-chromium resistance wire or a miniature high-temperature ceramic heating rod on the market, and the heating temperature can reach 300°C-500°C.

[0043] The energetic agent 400 includes a plurality of agent units stacked in sequence. To ensure the ignition efficiency, some energetic powder can be injected and compacted through the circular hole channel formed by the lower graphite sheet 16 and the lower electrical component 13. After the material is filled, it can be sealed by a circular foil of a certain thickness. The circular foil can have a certain viscosity, such as aluminum foil tape, to ensure the sealing. At the same time, by adjusting the agent unit, the appropriate reaction rate can also be regulated.

[0044] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A ring cutting device for unblocking deep well oil pipes, characterized in that: It comprises an ignition unit, a main body unit and a nozzle unit which can be detachably connected in sequence, wherein energetic agents are placed in the ignition unit and in the upper part of the main body unit, and the ignition unit can ignite the energetic agents, and a molten jet generated by the combustion of the energetic agents can enter the nozzle unit, a plurality of flow channels which can communicate with the outside are arranged on the side wall of the nozzle unit, and a sealing plug is arranged inside the nozzle unit, and before the molten jet enters the nozzle unit, the sealing plug can seal each of the flow channels, and after the molten jet enters the nozzle unit, the sealing plug can be moved downward and the flow channel can be exposed under the action of pressure and ablation, and the flow channel is used to eject the molten jet.

2. The ring cutting device for unstuck deep well oil pipe according to claim 1 is characterized in that: The nozzle unit includes a nozzle body, a sealing plug and a plug. The nozzle body is hollow inside and open at both ends. The first end of the nozzle body can extend into the second end of the main unit and can be detachably connected to the second end of the main unit. The second end of the nozzle body can be detachably connected to the first end of the plug. Each of the flow channels is fan-shaped, and the flow channels are circumferentially arranged and opened on the side wall in the middle of the nozzle body. The sealing plug is installed inside the nozzle body.

3. The ring cutting device for unstuck deep well oil pipe according to claim 2 is characterized in that: A first step surface is provided on the outer wall of the first end of the nozzle body, and the second end of the main unit abuts on the first step surface and is connected to the first end of the nozzle body by a thread; the nozzle body is provided with an outer lining on the outer wall corresponding to each of the flow channels, and the outer lining is provided with an extension opening for exposing the flow channels at the position corresponding to each of the flow channels; a sleeve is provided on the outer periphery of the connection between the nozzle body and the main unit, and a second step surface is provided on the outer wall of the second end of the main unit, and the two ends of the sleeve are respectively abutted against the second step surface and one side of the outer lining, and a number of large sealing rings are provided between the inner wall of the sleeve and the outer wall of the nozzle body, and between the inner wall of the sleeve and the outer wall of the main unit.

4. The ring cutting device for unstuck deep well oil pipe according to claim 2 is characterized in that: The first end of the plug extends into the second end of the nozzle body and is threadedly connected to the second end of the nozzle body, and a plurality of middle sealing rings are provided between the inner wall of the nozzle body and the outer wall of the plug; the plug includes a large cylindrical section and a small cylindrical section, the large cylindrical section and the small cylindrical section are transitioned through a conical surface, and the outer wall of the small cylindrical section is provided with a circle of annular grooves for connecting instruments.

5. The ring cutting device for unstuck deep well oil pipe according to claim 2 is characterized in that: The longitudinal section of the sealing plug is H-shaped, and the upper and lower end surfaces of the sealing plug are hollowed out to form a blind hole, and the position of the sealing plug avoiding the blind hole corresponds to the flow channel setting; the first end of the sealing plug is provided with a circle of outer edge, and the outer edge can overlap the step surface of the inner wall of the nozzle body, and a number of small sealing rings are provided between the inner wall of the nozzle body and the outer wall of the sealing plug.

6. The ring cutting device for unstuck deep well oil pipe according to claim 1, characterized in that: The main unit includes a main torch which is hollow inside and connected in sequence, and several extension torches. The main torch includes an internally connected cavity and a drug-carrying cavity. The cavity is connected to the interior of the adjacent nozzle unit. The energetic agent is placed in the drug-carrying cavity. The second end of the ignition unit extends into the drug-carrying cavity and is connected to the drug-carrying cavity by a thread. The extension torch at the end can be detachably connected to the main torch.

7. The ring cutting device for unstuck deep well oil pipe according to claim 6, characterized in that: An upper sealing ring is provided between the outer wall of the ignition unit and the inner wall of the drug-carrying cavity.

8. The ring cutting device for unstuck deep well oil pipe according to claim 1, characterized in that: The ignition unit includes an outer shell, an inner core and an outer plug. The outer shell is detachably connected to the main unit. The outer plug is threadedly connected to the inner wall of the second end of the outer shell. The inner core is installed in the outer shell, and the second end of the inner core abuts against the outer plug.

9. The ring cutting device for unstuck deep well oil pipe according to claim 8, characterized in that: The inner core comprises an inner shell, an upper plug, an insulator, an upper electrical component, a heating element, a graphite tube, a graphite sheet, a lower electrical component and a lower plug. The inner shell is limitedly connected to the inner wall of the outer shell, and an O-ring is arranged between the outer wall of the inner shell and the inner wall of the outer shell. The inner shell is sleeved on the outer periphery of the graphite tube, and both ends of the inner shell extend out of the two ends of the graphite tube. The graphite tube is used to place the energetic agent. The upper electrical component is installed inside the first end of the inner shell, and the outer periphery of the upper electrical component is sleeved with the insulator. The first end of the upper electrical component The end extends out of the first end of the insulator and is limited by a retaining ring, the upper plug is threadedly connected to the inner wall of the first end of the inner shell to limit the insulator and the upper electrical component, the lower electrical component is installed inside the second end of the inner shell, and the lower plug is threadedly connected to the inner wall of the second end of the inner shell to limit the lower electrical component, the graphite sheet is located between the second end of the graphite tube and the lower electrical component, the two ends of the heating element are respectively connected to the upper electrical component and the lower electrical component, and the heating element passes through the energetic agent.

10. The ring cutting device for unstuck deep well oil pipe according to claim 1, characterized in that: The energetic agent comprises a plurality of agent units stacked in sequence.

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