Oilfield underground hole channel dredging equipment and hot melting spraying device

Abstract

The invention provides an oil field underground hole channel dredging device and a hot melting spraying device. The oil field underground hole channel dredging device comprises an electric supporting leg device, the hot melting spraying device and a punching and sand fixing device, and the hot melting spraying device comprises a conductive assembly, an ignition assembly and a spraying assembly. According to the invention, the electric supporting leg device is adopted to realize underground positioning of the whole equipment; a hot melting jetting device is adopted to generate high-temperature and high-pressure metal fluid, and blockage removal and reaming of the throttler are achieved. The punching and sand fixing device is used for generating metal fluid and carrying a sand fixing agent, so that sand fixing is carried out on the dredged hole channel, and the hole channel is prevented from being blocked again subsequently. By means of the design, blockage removal of the oil production or gas production hole channel is achieved, underground accidents are avoided, and production of an oil and gas well can be recovered.

Description

Technical Field

[0001] The invention belongs to the technical field of handling blockage accidents of gas or oil production channels of downhole pipes in oil and gas fields, relates to channel dredging operations, and specifically relates to downhole channel dredging equipment and a hot melt jetting device in oil fields. Background Art

[0002] Low-permeability, low-pressure, and low-abundance gas reservoirs have the problems of low single-well production, large number of wells, and difficulty in economical and effective development. In order to develop low-permeability, low-pressure, and low-abundance gas reservoirs on a large scale and efficiently, a tubing-free completion method is generally adopted, and downhole chokes are generally deployed before production. That is, the centralized heating and alcohol injection processes in the ground process are reduced through downhole throttling and geothermal compensation technology, laying a good foundation for high-efficiency and low-cost development of gas fields.

[0003] The choke usually has a significant impact on production due to serious liquid accumulation, damage to the throttling nozzle, scaling or erosion in the wellbore within 1 to 2 years after installation, so the choke needs to be recovered in time. However, the locking blocks of some chokes are stuck in the working barrel and have failed to be extracted many times, which will block the gas production channel for a long time, seriously affecting the smooth implementation of the mid-term drainage and gas production process of the gas well, the later wellhead compressor pressurization and other production needs, and thus seriously affecting the gas production of the gas well.

[0004] In response to the above phenomenon, we will try to solve it with a variety of conventional well repair technology methods, such as heavy-duty wire rope salvage, continuous tubing salvage, continuous tubing drilling and grinding, pressure operation machine salvage, radial drilling of production tubing with wire tools, or direct replacement of production tubing. However, for the deep structure of gas wells without oil pipe completion, it is impossible to directly replace the production string, and it is impossible to use wire tools to radially drill holes in the production tubing. The other optional well repair technologies have problems such as low success rate, long operation cycle, and long production organization cycle, which have caused difficult wells to be shelved for a long time. These difficult wells have been in a state of low or zero production for a long time, so there is an urgent need for an effective solution to restore them to normal production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an oil field downhole channel clearing equipment and a hot melt injection device to solve the technical problem in the prior art that the gas production channels of low-permeability, low-pressure and low-abundance gas fields are blocked, resulting in insufficient gas production or even production suspension.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] An oilfield underground channel dredging device comprises an electric leg support device, a hot melt jet device and a drilling and sand fixation device which are arranged from back to front.

[0008] The electric leg stretching device comprises an outer shell of the electric leg stretching device, in which a motor is arranged, the axial front end of the motor is connected to the axial rear end of the screw, the axial front end of the screw is connected to a pushing block, a plurality of springs are arranged in the axial rear end of the pushing block, the radial inner end of the spring is fixedly connected in the pushing block, the radial outer end of the spring is fixedly connected to the leg stretching, and the plurality of leg stretching legs are evenly distributed along the circumferential direction; a plurality of leg stretching outlets are opened on the axial front part of the outer shell of the electric leg stretching device, the number of the leg stretching outlets is equal to and corresponds to the number of the legs, and the legs can be extended from the leg stretching outlets.

[0009] The hot melt spraying device comprises a conductive component, an ignition component and a spraying component which are arranged in sequence from back to front.

[0010] The conductive component includes a conductive sealing plug, a rear conductive spring sheet, a conductive spring, a front conductive spring sheet and a conductive rod which are arranged in sequence from back to front; the axial rear end of the conductive sealing plug extends into the electric leg support device, the axial front end of the conductive sealing plug extends into the central hole of the rear conductive spring sheet and contacts the rear conductive spring sheet, the rear conductive spring sheet and the front conductive spring sheet are connected by the conductive spring, the front conductive spring sheet contacts the axial rear end of the conductive rod, and the axial front end of the conductive rod contacts the ignition component.

[0011] The ignition assembly includes a grounded metal pressure screw, in which a grounded copper sheet is arranged; an igniter cavity is arranged on the axial front side of the grounded metal pressure screw, in which the igniter cavity is filled with igniter, and a heating resistor is buried in the igniter; the axial front part of the heating resistor passes through the grounded metal pressure screw and the grounded copper sheet and is in close contact with the grounded copper sheet; a resistance screw is arranged in the heating resistor, the axial rear end of the resistance screw passes through the axial rear end of the heating resistor, the grounded copper sheet and the grounded metal pressure screw in turn and extends into the conductive rod, and the axial front end of the resistance screw passes through the outside of the axial front end of the heating resistor and is buried in the igniter.

[0012] The injection component is provided with an injection medicine cavity, which is connected with the ignition agent cavity of the ignition component, and the injection medicine cavity is filled with multiple sections of injection medicine.

[0013] The drilling and sand fixation device includes a drilling joint, the axial rear end of the drilling joint is connected to the injection assembly; a drilling seat is fixedly installed in the axial front end of the drilling joint, the space surrounded by the axial rear end surface of the drilling seat and the drilling joint is the explosive chamber, and the explosive chamber is filled with explosive; a plurality of boosting holes are opened on the axial front part of the drilling joint, and the explosive chamber is connected with the boosting holes; a detonating cord is arranged in the axial rear part of the drilling seat, the axial rear end of the detonating cord is in contact with the explosive, and a charge liner is fixedly arranged in the axial front part of the drilling seat, the space surrounded by the charge liner and the drilling seat is the drilling charge chamber, the drilling charge chamber is filled with drilling charge, and the drilling charge is in contact with the axial front end of the detonating cord.

[0014] The present invention also has the following technical features:

[0015] The conductive component also includes a conductive joint; the conductive sealing plug is sealed and fixedly installed in the axial rear part of the conductive joint, an insulating shell and an insulating gland are arranged in the axial front part of the conductive joint, and the insulating gland is fixedly installed in the axial rear end of the insulating shell; the rear conductive spring sheet is fixedly installed in the insulating gland; the front conductive spring sheet is movably arranged in the insulating shell.

[0016] An insulating pressure screw is arranged inside the grounding metal pressure screw, and the insulating pressure screw is fixedly installed on the resistance screw rod by using internal threads, and the grounding copper sheet is located between the rear inner wall of the grounding metal pressure screw and the insulating pressure screw.

[0017] The ignition assembly also includes an ignition joint, which is fixedly connected to the conductive joint; the grounded metal pressure screw is fixedly installed in the axial rear end of the ignition joint, and a metal plug is fixedly installed in the axial front end of the ignition joint; the space enclosed by the grounded metal pressure screw, the insulating pressure screw, the ignition joint and the metal plug is an ignition agent chamber.

[0018] The injection assembly also includes an injection shell, which is fixedly connected to the ignition joint; a nozzle is fixedly arranged in the axial front part of the injection shell, and the space surrounded by the axial rear end face of the nozzle, the injection shell and the metal plug is the injection medicine cavity.

[0019] The axial front part of the nozzle is fixedly connected to a spray tail frame, which is fixedly installed in the axial front end of the spray shell. A spray liner is coaxially arranged in the spray tail frame, and the axial rear end face of the spray liner is in contact with the spray medicine; a plurality of spray guide rods are integrally arranged at the shoulder of the spray tail frame.

[0020] A sand-fixing box is fixedly installed on the axial front end of the punching seat, and a sand-fixing agent is contained in the sand-fixing box.

[0021] The perforated joint is divided into a large end section and a small end section from back to front. Both the large end section and the small end section are hollow annular cylindrical structures. The central through hole of the large end section is the perforated joint through hole, and the central through hole of the small end section is the perforated medicine cavity, which is connected to the perforated joint through hole. A plurality of perforated joint easy-to-break grooves are provided on the inner wall of the large end section of the perforated joint.

[0022] Both axial ends of the outer shell of the electric leg support device are open, a cable connector is fixedly installed in the axial rear end of the outer shell of the electric leg support device, and an electric leg support device connector is fixedly installed in the axial front end of the outer shell of the electric leg support device.

[0023] A motor fixing seat is fixedly installed in the outer shell of the electric leg support device. The space enclosed by the cable connector, the outer shell of the electric leg support device and the motor fixing seat is a motor installation cavity. A motor is arranged in the motor installation cavity. The axial front end of the motor is fixedly installed in the motor fixing seat.

[0024] The space enclosed by the outer shell of the electric leg support device, the motor fixing seat and the electric leg support device joint is a leg support driving chamber, in which a lead screw is arranged, and the axial rear end of the lead screw passes through the central hole of the motor fixing seat.

[0025] The present invention protects a hot melt spraying device as described above.

[0026] Compared with the prior art, the present invention has the following technical effects:

[0027] (I) The oilfield downhole channel dredging equipment of the present invention adopts an electric leg support device to realize the downhole positioning of the whole equipment; adopts a hot melt jet device to generate a high-temperature and high-pressure metal fluid to realize the unblocking and hole expansion of the throttle; adopts a drilling sand fixation device to generate a metal fluid and carry a sand fixation agent to realize the sand fixation of the dredged channel to prevent the channel from being blocked again in the future. Through the above design, the present invention realizes the unblocking of the oil or gas production channel, avoids downhole accidents, and enables the oil and gas well to resume production.

[0028] (II) The hot melt spraying device of the present invention has the advantages of small size, simple construction and high efficiency, and is non-explosive, which greatly reduces the difficulty, risk and cost of the operation, and can achieve the purpose of opening a channel and expanding the hole of the downhole throttle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the hot melt injection device.

[0030] Figure 2 It is a schematic diagram of the structure of the conductive component and the ignition component.

[0031] Figure 3 It is a schematic diagram of the structure of the injection assembly.

[0032] Figure 4 This is a schematic diagram of the structure of the jet tail rack.

[0033] Figure 5 It is a schematic diagram of the overall structure of the oil field downhole channel dredging equipment.

[0034] Figure 6 It is a schematic diagram of the structure of the electric leg support device when multiple leg support devices are unfolded.

[0035] Figure 7 It is a schematic diagram of the structure of the electric leg support device when multiple leg support devices are retracted.

[0036] Figure 8 This is a schematic diagram of the structure of the drilling sand fixation device.

[0037] Fig. 9 It is a schematic diagram of the structure of the punching joint device.

[0038] Fig.10 This is a schematic diagram of the oil field downhole channel dredging equipment during underground operation.

[0039] The meanings of the numbers in the figure are: 1-electric leg support device, 2-hot melt injection device, 3-drilling and sand fixation device, 4-connector, 5-throttle casing, 6-throttle plugging, 7-throttle sand body, 8-target pipe string.

[0040] 101-electric leg support device housing, 102-motor, 103-screw, 104-pushing block, 105-leg support spring, 106-leg support, 107-leg support outlet, 108-cable connector, 109-electric leg support device connector, 110-motor fixing seat, 111-screw sleeve.

[0041] 201 - conductive component, 202 - ignition component, 203 - injection component.

[0042] 301- perforating joint, 302- perforating seat, 303- detonating charge, 304- pressurization hole, 305- detonating cord, 306- charge liner, 307- perforating charge, 308- sand control fixing box.

[0043] 20101-conductive sealing plug, 20102-rear conductive spring sheet, 20103-conductive spring, 20104-front conductive spring sheet, 20105-conductive rod, 20106-conductive connector, 20107-insulating shell, 20108-insulating gland.

[0044] 20201-grounding metal pressure screw, 20202-grounding copper sheet, 20203-ignition agent, 20204-heating resistor, 20205-heating resistor screw, 20206-insulating pressure screw, 20207-ignition connector, 20208-metal plug.

[0045] 20301- spray medicine, 20302- spray shell, 20303- nozzle, 20304- spray tail frame, 20305- spray liner, 20306- spray guide rod.

[0046] 30101- large end section of the punched joint, 30102- small end section of the punched joint, 30103- through hole of the punched joint, 30104- easy-to-break groove of the punched joint.

[0047] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0048] It should be noted that, unless otherwise specified, all parts, explosives and materials in the present invention are parts, explosives and materials known in the art, for example, the detonating agent (303), the detonating cord (305), the punching agent (307) and the propelling agent (20301) are conventional explosives known in the prior art. The sand-fixing agent is a conventional sand-fixing agent known in the prior art.

[0049] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0050] Embodiment 1:

[0051] This embodiment provides a hot melt spraying device, such as Figure 1 As shown, it includes a conductive component 201, an ignition component 202 and an injection component 203 arranged in sequence from back to front. In this embodiment, the conductive component 201 is used to transfer current to the ignition component 202, the ignition component 202 is used to detonate the injection component 203, and the injection component 203 clears the underground channel by spraying a metal jet. The specific principle is: the conductive component 201 transfers external current to the grounded metal pressure screw 20201, the grounded copper sheet 20202, the heating resistor screw 20205 and the heating resistor 20204 of the ignition component 202, and the heating resistor 20204 heats up and detonates the ignition agent 20203 under the action of the current, and the ignition agent 20203 burns to form a high-temperature and high-pressure metal fluid, and finally detonates the injection medicine 20301 of the injection component 203.

[0052] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, the conductive component 201 includes a conductive sealing plug 20101, a rear conductive spring sheet 20102, a conductive spring 20103, a front conductive spring sheet 20104 and a conductive rod 20105 which are arranged in sequence from back to front; the axial rear end of the sealing plug 20102 of the conductive sealing plug 20101 extends into the electric leg support device connector 109 of the electric leg support device 1, and the axial front end of the conductive sealing plug 20101 extends into the central hole of the rear conductive spring sheet 20102 and contacts the rear conductive spring sheet 20102, the rear conductive spring sheet 20102 and the front conductive spring sheet 20104 are connected through the conductive spring 20103, the front conductive spring sheet 20104 contacts the axial rear end of the conductive rod 20105, and the axial front end of the conductive rod 20105 contacts the heating resistor screw 20205 of the ignition component 202.

[0053] As a specific solution of this embodiment, Figure 2 and Figure 5 As shown, the conductive component 201 also includes a conductive connector 20106, which is connected to the connector 4; the conductive sealing plug 20101 is sealed and fixedly installed in the axial rear part of the conductive connector 20106, and an insulating shell 20107 and an insulating gland 20108 are arranged in the axial front part of the conductive connector 20106, and the insulating gland 20108 is fixedly installed in the axial rear end of the insulating shell 20107; the rear conductive spring sheet 20102 is fixedly installed in the insulating gland 20108; the front conductive spring sheet 20104 is movably arranged in the insulating shell 20107.

[0054] In this embodiment, as the spring expands and contracts, the front conductive spring sheet 20104 can move along the axial direction, ensuring that the front conductive spring sheet 20104 is always in close contact with the conductive rod 20105, and the insulating shell 20107 and the insulating pressure cover 20108 protect and fix the above-mentioned internal components.

[0055] In this embodiment, the conductive sealing plug 20101, the rear conductive spring sheet 20102, the conductive spring 20103, the front conductive spring sheet 20104, the conductive rod 20105, the insulating shell 20107 and the insulating gland 20108 are all arranged in the conductive joint 20106, and the conductive joint 20106 plays the role of protecting internal components and installing connections.

[0056] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, the ignition assembly 202 includes a grounded metal pressure screw 20201, in which a grounded copper sheet 20202 is arranged; an igniter cavity is arranged on the axial front side of the grounded metal pressure screw 20201, and the igniter cavity is filled with an igniter 20203, and a heating resistor 20204 is buried in the igniter 20203; the axial front part of the heating resistor 20204 passes through the grounded metal pressure screw 20201 and the grounded copper sheet 20202 and is connected to the grounded The copper sheet 20202 is in close contact; a heating resistor screw 20205 is arranged in the heating resistor 20204, and the axial rear end of the heating resistor screw 20205 passes through the axial rear end of the heating resistor 20204, the grounding copper sheet 20202 and the grounding metal pressure screw 20201 in sequence and extends into the conductive rod 20105, and the axial front end of the heating resistor screw 20205 passes through the outside of the axial front end of the heating resistor 20204 and is buried in the igniter 20203.

[0057] As a specific solution of this embodiment, Figure 2As shown, an insulating pressure screw 20206 is provided inside the grounding metal pressure screw 20201, and the insulating pressure screw 20206 is fixedly installed on the heating resistor screw 20205 by means of internal threads, and the grounding copper sheet 20202 is located between the rear inner wall of the grounding metal pressure screw 20201 and the insulating pressure screw 20206. In this embodiment, under the action of the insulating pressure screw 20206, the grounding copper sheet 20202 is in close contact with the grounding metal pressure screw 20201 and the heating resistor 20204.

[0058] As a specific solution of this embodiment, Figure 2 As shown, the ignition assembly 202 also includes an ignition connector 20207, which is fixedly connected to the conductive connector 20106; a grounded metal pressure screw 20201 is fixedly installed in the axial rear end of the ignition connector 20207, and a metal plug 20208 is fixedly installed in the axial front end of the ignition connector 20207; the space enclosed by the grounded metal pressure screw 20201, the insulating pressure screw 20206, the ignition connector 20207 and the metal plug 20208 is an ignition agent chamber.

[0059] In this embodiment, the grounding metal pressure screw 20201, the heating resistor 20204, the grounding copper sheet 20202, the ignition agent 20203, the heating resistor screw 20205 and the insulating pressure screw 20206 are all located in the ignition joint 20207. The ignition joint 20207 and the metal plug 20208 serve to protect the internal components and the installation connection.

[0060] As a specific solution of this embodiment, the heating resistor 20204 is a wire-wound resistor, including a hollow base tube with a resistance wire spirally wound outside the base tube. The heating resistor screw 20205 serves to fix the grounding metal pressure screw 20201 and the grounding copper sheet 20202.

[0061] As a specific scheme of this embodiment, the igniter 20203 is a non-explosive powder explosive, which is a mixture of a metal reducing agent and an oxidizing agent, wherein the metal reducing agent is selected from one or more of Al, Mg, and Zn, and the oxidizing agent is selected from one or more of Fe2O3, Fe3O4, and CuO.

[0062] As a specific solution of this embodiment, Figure 3 As shown, the injection assembly 203 also includes an injection shell 20302, which is fixedly connected to the ignition joint 20207; a nozzle 20303 is fixedly arranged in the axial front part of the injection shell 20302, and the space enclosed by the axial rear end face of the nozzle 20303, the injection shell 20302 and the metal plug 20208 is an injection medicine cavity; the injection medicine cavity is connected to the ignition agent cavity of the ignition assembly 202, and the injection medicine cavity is filled with multiple sections of injection medicine 20301.

[0063] In this embodiment, the spray medicine 20301, the nozzle 20303, the spray tail frame 20304, the spray liner 20305, and the spray guide rod 20306 are all located in the spray shell 20302. The spray shell 20302 plays a role in protecting internal components and installation connections.

[0064] As a specific solution of this embodiment, Figure 3 As shown, the axial front part of the nozzle 20303 is fixedly connected to the injection tail frame 20304, and the injection tail frame 20304 is fixedly installed in the axial front end of the injection shell 20302. The injection liner 20305 is coaxially arranged in the injection tail frame 20304, and the axial rear end face of the injection liner 20305 is in contact with the injection medicine 20301.

[0065] In this embodiment, the spray tail frame 20304, the nozzle 20303 and the spray liner 20305 together constitute a spray structure for spraying out the metal jet formed by the spray medicine.

[0066] As a specific solution of this embodiment, Figure 4 As shown, three injection guide rods 20306 are integrally arranged at the shoulder of the injection tail frame 20304. In this embodiment, the injection guide rods 20306 can effectively guide the injected fluid to prevent the injected fluid from accumulating on the axial front end surface of the injection tail frame 20304 and damaging the injection assembly.

[0067] As a specific solution of this embodiment, the nozzle 20303 and the injection liner 20305 are both made of high-temperature resistant materials, or the surface is sprayed with high-temperature resistant materials; the high-temperature resistant materials are selected from one or more of Mo, Ta, W, C, and Zr.

[0068] Embodiment 2:

[0069] This embodiment provides an oil field downhole channel dredging device, such as Figure 5 As shown, it includes an electric leg support device 1, a hot melt jet device 2 of embodiment 1, and a perforating and sand fixing device 3 which are arranged in sequence from back to front. In this embodiment, the electric leg support device 1 is used to fix the hot melt channel dredging equipment in the oil field underground in the target pipe string 8; the hot melt jet device 2 is used to dredge the throttle, and the perforating and sand fixing device 3 is used to dredge the channel.

[0070] As a specific solution of this embodiment, Figure 6 and Figure 7As shown, the electric leg support device 1 includes an electric leg support device housing 101, in which a motor 102 is arranged, the axial front end of the motor 102 is connected to the axial rear end of the lead screw 103, the axial front end of the lead screw 103 is connected to a pushing block 104, and a plurality of leg support springs 105 are arranged in the axial rear end of the pushing block 104, the radial inner end of the leg support spring 105 is fixedly connected to the pushing block 104, the radial outer end of the leg support spring 105 is fixedly connected to the leg support 106, and the plurality of leg support 106 are evenly distributed along the circumferential direction; a plurality of leg support outlets 107 are opened on the axial front part of the electric leg support device housing 101, the number of the leg support outlets 107 is equal to and corresponds to the number of the leg support outlets 107, and the leg support 106 can extend from the leg support outlets 107.

[0071] In this embodiment, by controlling the forward and reverse rotation of the motor 102 to drive the screw 103, the push block 104 can be controlled to move in the axial direction, so that the support leg 106 moves accordingly. When the support leg 106 moves to the support leg outlet 107, it extends out from it and then supports on the inner wall of the target pipe column 8, thereby realizing the positioning of the entire equipment.

[0072] As a specific solution of this embodiment, Figure 6 and Figure 7 As shown, both axial ends of the electric leg support device housing 101 are open, a cable connector 108 is fixedly installed in the axial rear end of the electric leg support device housing 101, and an electric leg support device connector 109 is fixedly installed in the axial front end of the electric leg support device housing 101; a motor fixing seat 110 is fixedly installed in the electric leg support device housing 101, and the space surrounded by the cable connector 108, the electric leg support device housing 101 and the motor fixing seat 110 is the motor installation cavity, in which a motor 102 is arranged, and the axial front end of the motor 102 is fixedly installed in the motor fixing seat 110; the space surrounded by the electric leg support device housing 101, the motor fixing seat 110 and the electric leg support device connector 109 is the leg support driving cavity, in which a lead screw 103 is arranged, and the axial rear end of the lead screw 103 passes through the center hole of the motor fixing seat 110.

[0073] As a specific solution of this embodiment, Figure 6 and Figure 7 As shown, a screw sleeve 111 is provided on the axial rear end outer shell of the screw 103 , and the screw sleeve 111 is used to protect the screw 103 .

[0074] As a specific solution of this embodiment, Figure 8As shown, the perforating sand fixation device 3 includes a perforating joint 301, which is fixedly installed in the injection shell 20302, and the axial rear part of the perforating joint 301 is fixedly connected to the injection tail frame 20304; a perforating seat 302 is fixedly installed in the axial front end of the perforating joint 301, and the space surrounded by the axial rear end surface of the perforating seat 302 and the perforating joint 301 is an explosive cavity, and the explosive cavity is filled with explosive 303; the perforating joint 301 is opened on the axial front end A plurality of pressurizing holes 304 are provided, and the explosive chamber is communicated with the pressurizing holes 304; a detonating cord 305 is provided in the axial rear part of the perforating seat 302, and the axial rear end of the detonating cord 305 is in contact with the explosive 303; a charge cap 306 is fixedly provided in the axial front part of the perforating seat 302, and the space enclosed by the charge cap 306 and the perforating seat 302 is the perforating chamber, and the perforating chamber is filled with perforating charge 307, and the perforating charge 307 is in contact with the axial front end of the detonating cord 305.

[0075] As a specific solution of this embodiment, Figure 8 As shown, a sand-control fixing box 308 is fixedly installed on the axial front end of the punching seat 302, and a sand-fixing agent is contained in the sand-control fixing box 308.

[0076] As a specific solution of this embodiment, Fig. 9 As shown, the perforated joint 301 is divided into a perforated joint large end section 30101 and a perforated joint small end section 30102 from back to front. The perforated joint large end section 30101 and the perforated joint small end section 30102 are both hollow annular cylindrical structures. The central through hole of the perforated joint large end section 30101 is the perforated joint through hole 30103, and the central through hole of the perforated joint small end section 30102 is the perforated medicine cavity, which is connected to the perforated joint through hole 30103; a plurality of perforated joint easy-to-break grooves 30104 are provided on the inner wall of the perforated joint large end section 30101.

[0077] As a specific solution of this embodiment, Figure 5 As shown, the electric leg support device 1 and the hot melt spray device 2 are connected via a connector 4, an electric leg support device connector 109 is installed in the axial rear part of the connector 4, and the axial front part of the connector 4 is fixedly connected to the conductive connector 20106 of the hot melt spray device 2.

[0078] like Fig.10 As shown, the working process of the present invention is as follows:

[0079] Step 1, lowering the device: thread and seal the electric leg support device 1, the hot melt injection device 2 and the drilling and sand fixation device 3 in sequence and tighten them; on the ground, lower the assembled oil field underground hot melt channel dredging equipment into the underground throttle through the cable car and cable.

[0080] In this embodiment, the throttle adopts a conventional throttle known in the prior art, which includes a throttle sleeve 5, and a throttle plug 6 is fixedly installed at the axial front end of the throttle sleeve 5. The space enclosed by the throttle sleeve 5 and the throttle plug 6 is a sand filling cavity, and the sand filling cavity is filled with a throttle sand body 7.

[0081] Step 2, device fixing: on the ground, power is supplied by a dedicated control power supply and the motor 102 is started. After the motor 102 rotates forward, it drives the screw 103 to rotate, and the screw 103 drives the push block 104 to move forward. When the support leg 106 on the push block 104 is pushed to the support leg outlet 107, the support leg spring 105 pops out so that the support leg 106 is supported on the pipe wall, and the oilfield downhole hot melt channel dredging equipment is fixed to the inner surface of the target pipe column 8 and automatically straightened.

[0082] Step 3: Channel dredging operation:

[0083] Liquid is injected into the target pipe string 8 in the well to increase pressure. The applied pressure is transmitted to the detonator 303 through the pressure-increasing hole 304 on the surface of the perforated joint 301. When the pressure exceeds the pressure-bearing range of the pressure detonator 303, the detonator 303 detonates the perforating charge 307 through the detonating cord 305, so that the perforated joint 301 is neatly broken at the perforated joint breakable groove 30104; at the same time, the perforating charge 307 generates a metal jet after blasting, and the blocked channel is cleared after the metal jet is ejected. The sand-fixing agent in the sand-proof fixing box 308 is brought into the channel by the metal jet, and the cleared channel is sand-fixed to prevent the channel from being blocked again later.

[0084] Step 4: Dredging the throttle:

[0085] Power is supplied by a dedicated control power supply on the ground, so that current enters the conductive sealing plug 20101, and then the current is transmitted to the heating resistor screw 20205 and the copper sheet 20204 through the rear conductive spring sheet 20102, the conductive spring 20103, the front conductive spring sheet 20104 and the conductive rod 20105 in turn, causing the heating resistor 20204 to heat up and ignite the igniter 20203; after the igniter 20203 burns, the injection medicine 20301 is ignited, and the injection medicine 20301 burns in the injection medicine cavity to produce high-temperature and high-pressure molten metal fluid, which flows into the remaining perforated joint 301 through the injection liner 20305 and burns it through, and then continues to spray toward the throttle casing 5 and ablates the blockage therein, thereby unblocking and expanding the hole of the throttle.

[0086] Step 5. After the throttle dredging operation is completed, the dedicated control power supply is used to power the motor 102 again, and the motor 102 reverses to drive the screw 103 to rotate. When the support leg 106 on the push block 104 retracts to the support leg outlet 107, it is cut off, and then the motor 102 continues to work to retract the screw 103, and finally the entire device is lifted out of the wellhead.

Claims

1. An oilfield downhole channel dredging device, characterized in that: It comprises an electric leg-supporting device (1), a hot melt spraying device (2) and a drilling and sand-fixing device (3) which are arranged from the back to the front; The electric leg-supporting device (1) comprises an electric leg-supporting device housing (101), wherein a motor (102) is arranged in the electric leg-supporting device housing (101), wherein the axial front end of the motor (102) is connected to the axial rear end of a lead screw (103), wherein the axial front end of the lead screw (103) is connected to a push block (104), wherein a plurality of leg-supporting springs (105) are arranged in the axial rear end of the push block (104), wherein the radial inner end of the leg-supporting spring (105) is fixedly connected to the push block (104), wherein the radial outer end of the leg-supporting spring (105) is fixedly connected to a leg-supporting leg (106), wherein the plurality of leg-supporting legs (106) are evenly distributed along the circumferential direction; wherein a plurality of leg-supporting outlets (107) are provided on the axial front portion of the electric leg-supporting device housing (101), wherein the number of the leg-supporting outlets (107) is equal to and corresponds to the number of the leg-supporting outlets (107), and the leg-supporting legs (106) can extend out of the leg-supporting outlets (107); The hot melt spraying device (2) comprises a conductive component (201), an ignition component (202) and a spraying component (203) which are arranged in sequence from back to front; The conductive component (201) comprises a conductive sealing plug (20101), a rear conductive spring sheet (20102), a conductive spring (20103), a front conductive spring sheet (20104) and a conductive rod (20105) which are arranged in sequence from back to front; the axial rear end of the sealing plug (20102) of the conductive sealing plug (20101) extends into the electric leg support device (1), the axial front end of the conductive sealing plug (20101) extends into the central hole of the rear conductive spring sheet (20102) and contacts the rear conductive spring sheet (20102), the rear conductive spring sheet (20102) and the front conductive spring sheet (20104) are connected via the conductive spring (20103), the front conductive spring sheet (20104) contacts the axial rear end of the conductive rod (20105), and the axial front end of the conductive rod (20105) contacts the ignition component (202); The ignition assembly (202) comprises a grounded metal pressure screw (20201), wherein a grounded copper sheet (20202) is arranged in the grounded metal pressure screw (20201); an igniter cavity is arranged on the axial front side of the grounded metal pressure screw (20201), wherein the igniter cavity is filled with an igniter (20203), and a heating resistor (20204) is buried in the igniter (20203); the axial front part of the heating resistor (20204) passes through the grounded metal pressure screw (20201) and the grounded copper sheet (20202) and is connected to the grounded The copper sheet (20202) is in close contact with the heating resistor (20204); a heating resistor screw (20205) is arranged in the heating resistor (20204); the axial rear end of the heating resistor screw (20205) passes through the axial rear end of the heating resistor (20204), the grounding copper sheet (20202) and the grounding metal pressure screw (20201) in sequence and extends into the conductive rod (20105); the axial front end of the heating resistor screw (20205) passes through the axial front end of the heating resistor (20204) and is buried in the igniter (20203); The injection component (203) is provided with an injection medicine cavity, the injection medicine cavity is connected to the ignition agent cavity of the ignition component (202), and the injection medicine cavity is filled with multiple sections of injection medicine (20301); The perforating sand fixation device (3) comprises a perforating joint (301), the axial rear end of the perforating joint (301) is connected to the injection assembly (203); a perforating seat (302) is fixedly installed in the axial front end of the perforating joint (301), the space enclosed by the axial rear end surface of the perforating seat (302) and the perforating joint (301) is a detonating chamber, and the detonating chamber is filled with detonating agent (303); a plurality of pressurizing holes (304) are opened on the axial front part of the perforating joint (301), and the detonating chamber is connected to the injection assembly (203). The boost hole (304) is connected; a detonating cord (305) is arranged in the axial rear part of the perforating seat (302), and the axial rear end of the detonating cord (305) contacts the detonating charge (303); a charge liner (306) is fixedly arranged in the axial front part of the perforating seat (302), and the space surrounded by the charge liner (306) and the perforating seat (302) is a perforating charge cavity, and the perforating charge cavity is filled with perforating charge (307), and the perforating charge (307) contacts the axial front end of the detonating cord (305).

2. The oilfield underground hot melt channel dredging equipment according to claim 1, characterized in that: The conductive component (201) further comprises a conductive joint (20106); the conductive sealing plug (20101) is sealed and fixedly installed in the axial rear part of the conductive joint (20106); an insulating housing (20107) and an insulating gland (20108) are arranged in the axial front part of the conductive joint (20106); the insulating gland (20108) is fixedly installed in the axial rear end of the insulating housing (20107); the rear conductive spring sheet (20102) is fixedly installed in the insulating gland (20108); and the front conductive spring sheet (20104) is movably arranged in the insulating housing (20107).

3. The oilfield underground hot melt channel dredging equipment according to claim 1, characterized in that: An insulating pressure screw (20206) is arranged inside the grounding metal pressure screw (20201), and the insulating pressure screw (20206) is fixedly installed on the heating resistor screw (20205) by means of an internal thread, and the grounding copper sheet (20202) is located between the rear inner wall of the grounding metal pressure screw (20201) and the insulating pressure screw (20206).

4. The oilfield underground hot melt channel dredging equipment according to claim 1, characterized in that: The ignition assembly (202) further comprises an ignition joint (20207), which is fixedly connected to the conductive joint (20106); the grounded metal pressure screw (20201) is fixedly installed in the axial rear end of the ignition joint (20207), and a metal plug (20208) is fixedly installed in the axial front end of the ignition joint (20207); the space enclosed by the grounded metal pressure screw (20201), the insulating pressure screw (20206), the ignition joint (20207) and the metal plug (20208) is an ignition agent cavity.

5. The oilfield underground hot melt channel dredging equipment according to claim 4, characterized in that: The injection assembly (203) further comprises an injection shell (20302), which is fixedly connected to the ignition joint (20207); a nozzle (20303) is fixedly arranged in the axial front part of the injection shell (20302), and the space enclosed by the axial rear end face of the nozzle (20303), the injection shell (20302) and the metal plug (20208) is the injection cavity.

6. The oilfield underground hot melt channel dredging equipment according to claim 4, characterized in that: The axial front part of the nozzle (20303) is fixedly connected to a jet tail frame (20304), which is fixedly installed in the axial front end of the jet shell (20302). A jet liner (20305) is coaxially arranged in the jet tail frame (20304), and the axial rear end face of the jet liner (20305) is in contact with the jet medicine (20301); a plurality of jet guide rods (20306) are integrally arranged at the shoulder of the jet tail frame (20304).

7. The oilfield underground hot melt channel dredging equipment according to claim 1, characterized in that: A sand-fixing box (308) is fixedly mounted on the axial front end of the punching seat (302), and a sand-fixing agent is contained in the sand-fixing box (308).

8. The oilfield underground hot melt channel dredging equipment according to claim 1, characterized in that: The perforated joint (301) is divided into a perforated joint large end section (30101) and a perforated joint small end section (30102) from back to front. The perforated joint large end section (30101) and the perforated joint small end section (30102) are both hollow annular cylindrical structures. The central through hole of the perforated joint large end section (30101) is the perforated joint through hole (30103), and the central through hole of the perforated joint small end section (30102) is the perforated medicine cavity, which is connected to the perforated joint through hole (30103); a plurality of perforated joint easy-to-break grooves (30104) are provided on the inner wall of the perforated joint large end section (30101).

9. The oilfield underground hot melt channel dredging equipment according to claim 8, characterized in that: Both axial ends of the electric leg support device housing (101) are open, a cable connector (108) is fixedly installed in the axial rear end of the electric leg support device housing (101), and an electric leg support device connector (109) is fixedly installed in the axial front end of the electric leg support device housing (101); A motor fixing seat (110) is fixedly installed in the housing (101) of the electric leg-supporting device; a space enclosed by the cable connector (108), the housing (101) of the electric leg-supporting device and the motor fixing seat (110) is a motor installation cavity; a motor (102) is arranged in the motor installation cavity; and an axial front end of the motor (102) is fixedly installed in the motor fixing seat (110); The space enclosed by the electric leg support device housing (101), the motor fixing seat (110) and the electric leg support device connector (109) is a leg support drive chamber, in which a lead screw (103) is arranged, and the axial rear end of the lead screw (103) passes through the center hole of the motor fixing seat (110).

10. A hot melt spraying device, characterized in that: It comprises a conductive component (201), an ignition component (202) and an injection component (203) which are arranged in sequence from back to front; The conductive component (201) comprises a conductive sealing plug (20101), a rear conductive spring sheet (20102), a conductive spring (20103), a front conductive spring sheet (20104) and a conductive rod (20105) which are arranged in sequence from back to front. The axial front end of the conductive sealing plug (20101) extends into the central hole of the rear conductive spring sheet (20102) and contacts the rear conductive spring sheet (20102). The rear conductive spring sheet (20102) and the front conductive spring sheet (20104) are connected via the conductive spring (20103). The front conductive spring sheet (20104) contacts the axial rear end of the conductive rod (20105). The axial front end of the conductive rod (20105) contacts the ignition component (202). The conductive component (201) further comprises a conductive joint (20106); the conductive sealing plug (20101) is sealed and fixedly installed in the axial rear part of the conductive joint (20106); an insulating housing (20107) and an insulating gland (20108) are arranged in the axial front part of the conductive joint (20106); the insulating gland (20108) is fixedly installed in the axial rear end of the insulating housing (20107); the rear conductive spring sheet (20102) is fixedly installed in the insulating gland (20108); the front conductive spring sheet (20104) is movably arranged in the insulating housing (20107); The ignition assembly (202) comprises a grounded metal pressure screw (20201), wherein a grounded copper sheet (20202) is arranged in the grounded metal pressure screw (20201); an igniter cavity is arranged on the axial front side of the grounded metal pressure screw (20201), wherein the igniter cavity is filled with an igniter (20203), and a heating resistor (20204) is buried in the igniter (20203); the axial front part of the heating resistor (20204) passes through the grounded metal pressure screw (20201) and the grounded copper sheet (20202) and is connected to the grounded The copper sheet (20202) is in close contact with the heating resistor (20204); a heating resistor screw (20205) is arranged in the heating resistor (20204); the axial rear end of the heating resistor screw (20205) passes through the axial rear end of the heating resistor (20204), the grounding copper sheet (20202) and the grounding metal pressure screw (20201) in sequence and extends into the conductive rod (20105); the axial front end of the heating resistor screw (20205) passes through the axial front end of the heating resistor (20204) and is buried in the igniter (20203); An insulating pressure screw (20206) is arranged inside the grounding metal pressure screw (20201), and the insulating pressure screw (20206) is fixedly installed on the heating resistor screw (20205) by means of an internal thread, and the grounding copper sheet (20202) is located between the rear inner wall of the grounding metal pressure screw (20201) and the insulating pressure screw (20206); The ignition assembly (202) further comprises an ignition joint (20207), and the ignition joint (20207) is fixedly connected to the conductive joint (20106); the grounded metal pressure screw (20201) is fixedly installed in the axial rear end of the ignition joint (20207), and a metal plug (20208) is fixedly installed in the axial front end of the ignition joint (20207); the space enclosed by the grounded metal pressure screw (20201), the insulating pressure screw (20206), the ignition joint (20207) and the metal plug (20208) is an ignition agent cavity; The injection assembly (203) comprises an injection shell (20302), and the injection shell (20302) is fixedly connected to the ignition joint (20207); a nozzle (20303) is fixedly arranged in the axial front part of the injection shell (20302), and the space enclosed by the axial rear end face of the nozzle (20303), the injection shell (20302) and the metal plug (20208) is an injection medicine cavity; the injection medicine cavity is connected to the ignition agent cavity of the ignition assembly (202), and the injection medicine cavity is filled with multiple sections of injection medicine (20301); The axial front part of the nozzle (20303) is fixedly connected to a jet tail frame (20304), which is fixedly installed in the axial front end of the jet shell (20302). A jet liner (20305) is coaxially arranged in the jet tail frame (20304), and the axial rear end face of the jet liner (20305) is in contact with the jet medicine (20301); a plurality of jet guide rods (20306) are integrally arranged at the shoulder of the jet tail frame (20304).

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