High-pressure oil and gas downhole electric heating plug removal device

Abstract

The invention provides a high-pressure oil and gas downhole electric heating plug removal device, and belongs to the technical field of oil well plug removal devices, the high-pressure oil and gas downhole electric heating plug removal device comprises a fixing seat, a fixing sleeve and a heating sleeve, the fixing sleeve and the heating sleeve are arranged on the fixing seat, a plurality of supporting rods are installed at the lower end of the fixing seat, supporting sleeves are installed on the outer walls of the supporting rods, and positioning bolts are installed on the inner walls of the supporting rods; a fixing frame and an electrical cabinet are installed on the upper surface of the fixing base, a motor is installed at the upper end of the fixing frame, a lead screw is installed on the inner wall of the fixing frame, a sliding plate is installed on the outer wall of the lead screw, and a gear is installed on the side wall of the lead screw. According to the device, an arranged gear is matched with a gear ring to enable the heating jacket to rotate while moving the heating jacket, and is matched with a drilling piece arranged at the lower end to crush and stir surrounding impurities through rotation and propelling effects, so that the impurities become loose, the side wall of the heating jacket is in contact with the inner walls of the impurities more quickly, and the contact area is increased; and therefore, impurities can be quickly melted from the inside to the periphery, and the blockage removal efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil well unblocking devices, and in particular to a high-pressure oil and gas underground electric heating unblocking device. Background Art

[0002] As the high-quality crude oil reserves of major oil fields are gradually depleted, the exploitation of difficult-to-use oil reservoirs in reserve blocks is gradually being put on the agenda, and the scale of exploitation of waxy, asphalt-containing and colloid-containing oil reservoirs is rapidly expanding. During the production of heavy oil wells, due to the excessively high viscosity and high wax content of the crude oil in the pipe injection, the oil channel of the oil pipe is reduced, the upward and downward resistance of the sucker rod increases, and the donkey head "fights" during the downstroke. In severe cases, the sucker rod will be stuck in the oil pipe, and even cause a sucker rod break accident. During the production of high-pressure oil and gas wells, the crude oil dissipates heat to the surrounding formations during the lifting process, and the wax in the waxy crude oil is precipitated. At the same time, the pressure drops, causing the oil to degas, and the asphalt, colloid and other components contained in it are precipitated, further exacerbating the formation of condensation. As more and more precipitated substances are released, the oil pipe will be blocked, resulting in the inability to produce.

[0003] In the prior art, mechanical unblocking methods such as using drilling tools, scrapers and other equipment for mechanical unblocking are generally used. The effect may not be good for deep blockages or blockages with complex shapes, and may also damage the well wall and oil pipes. In addition, mechanical unblocking usually requires downhole operations, which are difficult and costly, and also have certain safety risks. How to invent a high-pressure oil and gas downhole electric heating unblocking device to solve these problems has become an urgent problem for technicians in this field. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a high-pressure oil and gas downhole electric heating unblocking device, which aims to solve the problem that mechanical unblocking methods such as using drilling tools, scrapers and other equipment for mechanical unblocking may not be effective for deep blockages or blockages of complex shapes.

[0005] The present invention is achieved in that:

[0006] The present invention provides a high-pressure oil and gas underground electric heating plugging removal device, comprising a fixing seat and a fixing sleeve and a heating sleeve arranged on the fixing seat, a plurality of support rods are installed at the lower end of the fixing seat, a support sleeve is installed on the outer wall of the support rod, a positioning bolt is installed on the inner wall of the support rod, a fixing frame and an electrical cabinet are installed on the upper surface of the fixing seat, a motor is installed on the upper end of the fixing frame, a screw rod is installed on the inner wall of the fixing frame, a slide plate is installed on the outer wall of the screw rod, a gear is installed on the side wall of the screw rod, a gear ring is installed on the upper surface of the fixing seat close to the gear, a blowout preventer is installed on the lower outer wall of the fixing seat, and a sealing plate is installed on the lower end of the blowout preventer;

[0007] The fixing sleeve is installed on the fixing seat and the inner wall of the blowout preventer, a rotating joint is installed on the upper end of the fixing sleeve, heating cables are installed on both ends of the rotating joint, one end of the heating cable is connected to the electrical cabinet, and a fixing ring is installed on the inner wall of the fixing sleeve;

[0008] The heating sleeve is installed on the inner wall of the fixing sleeve near the lower end, a positioning ring is installed on the inner wall of the heating sleeve, a mounting seat fixedly connected to the lower end of the heating cable is installed at the lower end of the positioning ring, a plurality of heating tubes are installed at the lower end of the mounting seat, a tension spring is installed at the upper end of the positioning ring, and a plurality of drill bits are installed on the lower end side wall of the heating sleeve.

[0009] Preferably, the upper end of the support rod is fixedly connected to the lower surface of the fixing seat, the outer wall of the support rod is slidably connected to the inner wall of the support sleeve, and the outer wall of the positioning bolt is threadedly connected to the inner wall of the fixing seat, the support rod and the support sleeve respectively.

[0010] Preferably, the output end of the motor is fixedly connected to the upper end of the screw rod, the side walls at both ends of the screw rod are rotatably connected to the inner walls of the fixing frame and the fixing seat respectively, and the inner wall of the slide plate is threadedly connected to the outer wall of the screw rod.

[0011] Preferably, the gear and the gear ring are meshingly connected, the lower end of the gear ring is equipped with a limiting ring rotatably connected to the inner wall of the fixed seat, the inner wall of the limiting ring is equipped with four axially symmetrical sliders, and the side wall of the fixed sleeve is provided with a plurality of sliding grooves slidably connected to the sliders.

[0012] Preferably, the side wall of the rotary joint is fixedly connected to the inner wall of the slide plate, the portion of the rotary joint near the lower end of the slide plate can rotate, the lower end of the rotary joint is sealed and fixed to the upper end of the fixed sleeve, the outer wall of the fixed sleeve is slidably connected to the inner wall of the blowout preventer, the upper end of the blowout preventer is fixed to the lower surface of the fixing seat by bolts, the lower end of the blowout preventer is fixedly connected to the sealing plate by bolts, the inner wall of the sealing plate is slidably connected to the outer wall of the fixed sleeve, and the lower surface of the sealing plate is tightly fixed to the ground around the wellhead.

[0013] Preferably, the outer wall of the heating sleeve is slidably connected to the inner wall of the fixed sleeve, the mounting seat is electrically connected to the heating tube and the heating cable respectively, and the side walls at both ends of the tension spring are fixedly connected to the positioning ring and one end of the fixing ring respectively.

[0014] Preferably, a sliding sleeve is fixedly connected to the upper end of the positioning ring, the heating cable is placed inside the sliding sleeve, a limiting groove is provided at the upper end of the fixing sleeve and is slidably connected to the inner wall of the sliding sleeve, a piston ring is installed on the outer wall of the heating sleeve, a plurality of guide holes are provided on the side wall of the heating sleeve near the upper part of the piston ring, and a plurality of liquid outlet holes are provided on the inner side wall of the fixing sleeve and are inclined downward toward the outer side wall;

[0015] Preferably, a plurality of liquid inlet holes are provided on the fixing ring, a liquid inlet pipe and an air inlet pipe are respectively installed on the upper side walls of the fixing sleeve, a valve is installed on the liquid inlet pipe, and a one-way valve is installed on the air inlet pipe.

[0016] Preferably, a cutting assembly is installed inside the heating sleeve, and the cutting assembly includes an extrusion rod, an extrusion block, a connecting rod, a compression spring, a positioning plate and a blade. A heat-conducting sleeve for protecting the heating tube is installed at the bottom end of the interior of the heating sleeve.

[0017] Preferably, the surrounding side walls of the heating sleeve are respectively fixedly connected to the side walls of one end of four compression springs, the side wall of the other end of the compression spring is fixedly connected to the outer wall of the positioning plate, the outer wall of the other side of the positioning plate is fixedly connected to one end of the blade, the blade is designed to be inclined downward, the outer wall of the blade and the inner wall of the heating sleeve are slidably connected, the extrusion blocks and the positioning plates form a group, the extrusion blocks in the same group are installed above the positioning plate, and the multiple extrusion blocks in the vertical direction are fixed by connecting rods, the upper end of the topmost extrusion block is equipped with an extrusion rod slidably connected to the positioning ring, and the upper end of the extrusion rod is fixedly connected to the lower surface of the fixing ring.

[0018] The beneficial effects of the present invention are:

[0019] The gear cooperates with the gear ring to move the heating sleeve and make it rotate at the same time, and cooperates with the drill bit arranged at the lower end to crush and stir the surrounding impurities through rotation and propulsion, so that the impurities become loose, and the side wall of the heating sleeve and the inner wall of the impurities are contacted more quickly, thereby increasing the contact area, so that the impurities are melted quickly from the inside to the surroundings, and the efficiency of unblocking is improved;

[0020] The anti-blocking liquid spraying structure is set to continuously spray it onto the surrounding blockages during the anti-blocking process, react chemically with the substances in the blockages, gradually dissolve the impurities, and reduce the compacting effect of the impurities. At the same time, the anti-blocking liquid has good permeability and can enter the tiny gaps and cracks of the impurities, diffuse to the surroundings to dissolve the impurities, and thus disintegrate the impurities inside. With the help of the heating sleeve, the impurities can be removed more easily and quickly, thereby improving the cleaning effect.

[0021] The cutting assembly is arranged to rotate the blockage around the heating sleeve during the unblocking process, thereby cutting and crushing the surrounding impurities that are difficult to melt, thereby improving the overall unblocking effect. During the rotation process, the heat of the blade itself will melt the impurities around it. While rotating, it continuously changes the position of reaching into the interior of the impurities and making contact with different positions, thereby increasing the contact area, heating and melting the interior of the impurities that the heating sleeve cannot reach, thereby improving the overall unblocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of a high-pressure oil and gas downhole electric heating plugging removal device provided by an embodiment of the present invention;

[0024] Figure 2 This is a high-pressure oil and gas underground electric heating plugging removal device provided by the embodiment of the present invention. Figure 1 A magnified view of the structure of the middle A area;

[0025] Figure 3 It is a half-section diagram of the overall structure of a high-pressure oil and gas downhole electric heating plugging removal device provided by an embodiment of the present invention;

[0026] Figure 4 This is a high-pressure oil and gas underground electric heating plugging removal device provided by the embodiment of the present invention. Figure 3 A magnified view of the structure of the middle B area;

[0027] Figure 5 It is a schematic diagram of a blockage removal mechanism in a high-pressure oil and gas downhole electric heating blockage removal device provided by an embodiment of the present invention;

[0028] Figure 6 It is a half-section diagram of a local area in a high-pressure oil and gas downhole electric heating plugging removal device provided by an embodiment of the present invention;

[0029] Figure 7 This is a high-pressure oil and gas underground electric heating plugging removal device provided by the embodiment of the present invention. Figure 6 A magnified view of the structure of the middle C region;

[0030] Figure 8 It is another half-section view of a local area of ​​a high-pressure oil and gas downhole electric heating plugging removal device provided by an embodiment of the present invention;

[0031] Fig. 9 This is a high-pressure oil and gas underground electric heating plugging removal device provided by the embodiment of the present invention. Figure 8 A magnified view of the structure of the middle D region;

[0032] Fig.10 It is a schematic diagram of the structure of a cutting assembly in a high-pressure oil and gas downhole electric heating plugging removal device provided by an embodiment of the present invention;

[0033] Fig.11It is a schematic diagram of the working of a cutting assembly in a high-pressure oil and gas downhole electric heating unblocking device provided by an embodiment of the present invention.

[0034] In the figure: 1, fixing seat; 11, support rod; 12, support sleeve; 13, positioning bolt; 14, fixing frame; 15, motor; 16, screw rod; 161, gear; 17, gear ring; 171, limit ring; 172, slider; 18, slide plate; 19, electrical cabinet; 2, blowout preventer; 21, sealing plate; 3, fixing sleeve; 31, slide groove; 32, limit groove; 33, liquid inlet pipe; 34, air inlet pipe; 35, valve; 36, one-way valve; 37, fixing Ring; 371, liquid inlet hole; 38, liquid outlet hole; 39, rotary joint; 4, heating sleeve; 41, positioning ring; 411, guide hole; 412, piston ring; 42, sliding sleeve; 43, mounting seat; 431, heating tube; 432, heating cable; 44, thermal conductive sleeve; 45, tension spring; 46, drill bit; 5, cutting assembly; 51, extrusion rod; 52, extrusion block; 521, connecting rod; 53, compression spring; 54, positioning plate; 55, blade. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0036] Example 1, with reference to Figure 1-Figure 11 A high-pressure oil and gas well electric heating unblocking device comprises a fixing seat 1 and a fixing sleeve 3 and a heating sleeve 4 arranged on the fixing seat 1, a plurality of support rods 11 are installed at the lower end of the fixing seat 1, a support sleeve 12 is installed on the outer wall of the support rod 11, a positioning bolt 13 is installed on the inner wall of the support rod 11, a fixing frame 14 and an electrical cabinet 19 are installed on the upper surface of the fixing seat 1, a motor 15 is installed on the upper end of the fixing frame 14, a screw rod 16 is installed on the inner wall of the fixing frame 14, a slide plate 18 is installed on the outer wall of the screw rod 16, a gear 161 is installed on the side wall of the screw rod 16, a gear ring 17 is installed on the upper surface of the fixing seat 1 close to the gear 161, a blowout preventer 2 is installed on the lower outer wall of the fixing seat 1, and a sealing plate 21 is installed on the lower end of the blowout preventer 2;

[0037] The fixing sleeve 3 is installed on the inner wall of the fixing seat 1 and the blowout preventer 2. A rotating joint 39 is installed on the upper end of the fixing sleeve 3. A heating cable 432 is installed on both ends of the rotating joint 39. One end of the heating cable 432 is connected to the electrical cabinet 19. A fixing ring 37 is installed on the inner wall of the fixing sleeve 3.

[0038] The heating sleeve 4 is installed on the inner wall of the fixed sleeve 3 near the lower end. A positioning ring 41 is installed on the inner wall of the heating sleeve 4. A mounting seat 43 fixedly connected to the lower end of the heating cable 432 is installed at the lower end of the positioning ring 41. A plurality of heating tubes 431 are installed at the lower end of the mounting seat 43. A tension spring 45 is installed at the upper end of the positioning ring 41. A plurality of drill bits 46 are installed on the lower end side wall of the heating sleeve 4.

[0039] Furthermore, the upper end of the support rod 11 is fixedly connected to the lower surface of the fixed seat 1, the outer wall of the support rod 11 is slidably connected to the inner wall of the support sleeve 12, the outer wall of the positioning bolt 13 is threadedly connected to the inner wall of the fixed seat 1, the support rod 11 and the support sleeve 12 respectively, the output end of the motor 15 is fixedly connected to the upper end of the screw rod 16, the side walls of the screw rod 16 at both ends are rotatably connected to the fixed frame 14 and the inner wall of the fixed seat 1 respectively, the inner wall of the slide plate 18 is threadedly connected to the outer wall of the screw rod 16, the gear 161 and the gear ring 17 are meshedly connected, the lower end of the gear ring 17 is equipped with a limit ring 171 rotatably connected to the inner wall of the fixed seat 1, the inner wall of the limit ring 171 is equipped with four axially symmetrical sliders 172, the side wall of the fixed sleeve 3 is provided with a plurality of slide grooves 31 slidably connected to the slider 172, and the rotation The side wall of the joint 39 is fixedly connected to the inner wall of the slide plate 18, the part of the rotary joint 39 close to the lower end of the slide plate 18 can rotate, the lower end of the rotary joint 39 is sealed and fixed to the upper end of the fixed sleeve 3, the outer wall of the fixed sleeve 3 is slidably connected to the inner wall of the blowout preventer 2, the upper end of the blowout preventer 2 is fixed to the lower surface of the fixing seat 1 by bolts, the lower end of the blowout preventer 2 is fixedly connected to the sealing plate 21 by bolts, the inner wall of the sealing plate 21 is slidably connected to the outer wall of the fixing sleeve 3, the lower surface of the sealing plate 21 is tightly fixed to the ground around the wellhead, the outer wall of the heating sleeve 4 is slidably connected to the inner wall of the fixing sleeve 3, the mounting seat 43 is electrically connected to the heating pipe 431 and the heating cable 432 respectively, and the side walls at both ends of the tension spring 45 are fixedly connected to the positioning ring 41 and one end of the fixing ring 37 respectively.

[0040] It should be noted that: the sealing plate 21 at the lower end of the blowout preventer 2 is fixed around the wellhead, and then the positioning bolt 13 is passed through the support sleeve 12 to fix it to the ground to fix the fixing seat 1 as a whole, so as to strengthen the fixation of the blowout preventer 2 and prevent the sealing plate 21 at the lower end from being separated from the wellhead. When unblocking, the motor 15 is started to drive the screw rod 16 to rotate, so that the slide plate 18 outside the screw rod 16 drives the fixing sleeve 3 at one end to move downward, so that the bottom heating sleeve 4 slowly penetrates into the wellhead, so that the bottom side wall of the heating sleeve 4 contacts the impurities blocked in the wellhead, and the heating cable 432 is powered by the electrical cabinet 19 to heat the heating tube 431, so as to realize the heating of the heating sleeve 4, and the impurities contacted at the bottom of the heating sleeve 4 gradually melt under high temperature to form grooves, and at the same time, the heating strip 4 continues to slide down to realize the penetration of the impurities and complete the unblocking;

[0041] While the heating sleeve 4 moves downward to melt the impurities, the gear 161 on the side wall of the screw rod 16 engages with the gear ring 17 to rotate. The rotating gear ring 17 drives the entire fixed sleeve 3 and the heating sleeve 4 at the lower end to rotate under the action of the slider 172. At the same time, a plurality of drill bits 46 arranged at the bottom end of the heating sleeve 4 rotate at the same time, and drill downward into the interior of the impurities under the action of rotation when contacting the impurities, and crush and stir the surrounding impurities through rotation and propulsion to loosen the impurities and improve the melting efficiency. At the same time, when the upper end of the impurity is relatively tight, the rotating drill bit 46 can help the heating sleeve break through the outer resistance, so that it can extend into the inner wall of the impurity faster, and can make the side wall of the heating sleeve 4 contact with the inner wall of the impurity faster, thereby increasing the contact area, thereby quickly melting the impurities from the inside to the surroundings, and improving the efficiency of unblocking.

[0042] Example 2, please refer to Figure 1-Figure 11 , based on Example 1, in order to further improve the efficiency of unblocking;

[0043] Furthermore, a sliding sleeve 42 is fixedly connected to the upper end of the positioning ring 41, a heating cable 432 is placed inside the sliding sleeve 42, a limiting groove 32 is provided at the upper end of the fixed sleeve 3 for sliding connection with the inner wall of the sliding sleeve 42, a piston ring 412 is provided on the outer wall of the heating sleeve 4, a plurality of guide holes 411 are provided on the side wall of the heating sleeve 4 near the upper part of the piston ring 412, a plurality of liquid outlet holes 38 are provided on the inner side wall of the fixed sleeve 3, a plurality of liquid inlet holes 371 are provided on the fixed ring 37, a liquid inlet pipe 33 and an air inlet pipe 34 are respectively provided on the upper side walls of the fixed sleeve 3, a valve 35 is provided on the liquid inlet pipe 33, and a one-way valve 36 is provided on the air inlet pipe 34;

[0044] Before unblocking, the space of the fixed sleeve 3 close to the outer side of the sliding sleeve 42 is filled with unblocking liquid through the liquid inlet pipe 33, and the valve 35 is closed, and then high-pressure air is rushed into the fixed sleeve 3 through the air inlet pipe 34 to maintain the high-pressure environment inside the fixed sleeve 3. In the process of the fixed sleeve 3 moving downward, when the bottom of the heating sleeve 4 contacts the upper surface of the impurities, in the subsequent rotation and downward movement process, the heating sleeve 4 is subjected to the forces at the upper and lower ends to compress the inner tension spring 45 until the upper end of the heating sleeve 4 abuts against the lower end of the fixed ring 37. At this time, the multiple guide holes 411 opened on the side wall of the heating sleeve 4 correspond to the multiple liquid outlet holes 38 on the side wall of the fixed sleeve 3. The declogging liquid inside the fixed sleeve 3 is rapidly ejected from the liquid outlet 38 to the surroundings under the action of high pressure. Due to the oblique design of the liquid outlet 38, it will hit the surface of the impurity at high speed, causing certain damage to the surface of the impurity, so that it is more heated and melted. At the same time, the declogging liquid covering the surface of the impurity reacts chemically with the substances in the impurity, so that the impurities are gradually dissolved, reducing the compacting effect of the impurities. At the same time, the good permeability of the declogging liquid will enable it to enter the tiny gaps and cracks of the impurities, diffuse to the surroundings to dissolve the impurities, thereby disintegrating the impurities inside, and cooperating with the heating sleeve 4 so that the impurities can be removed more easily and quickly, thereby improving the cleaning effect.

[0045] Example 3, please refer to Figure 1-Figure 11 , based on Example 2, in order to avoid the presence of insoluble impurities in the blockage impurities near the heating jacket 4, which cannot be cleaned during the electric heating process;

[0046] Furthermore, a cutting assembly 5 is installed inside the heating sleeve 4, and the cutting assembly 5 includes an extrusion rod 51, an extrusion block 52, a connecting rod 521, a compression spring 53, a positioning plate 54 and a blade 55. A heat-conducting sleeve 44 for protecting the heating tube 431 is installed at the bottom end of the interior of the heating sleeve 4. The side walls of the heating sleeve 4 are fixedly connected to the side walls of one end of the four compression springs 53, respectively, and the side walls of the other ends of the compression springs 53 are fixedly connected to the outer wall of the positioning plate 54. The outer wall of the other side of the positioning plate 54 is fixedly connected to one end of the blade 55. The blade 55 is designed to be inclined downward, and the outer wall of the blade 55 is slidably connected to the inner wall of the heating sleeve 4. The extrusion blocks 52 and the positioning plates 54 are a group, and the extrusion blocks 52 of the same group are installed above the positioning plate 54. In the vertical direction, multiple extrusion blocks 52 are fixed by connecting rods 521. The upper end of the uppermost extrusion block 52 is provided with an extrusion rod 51 slidably connected to the positioning ring 41, and the upper end of the extrusion rod 51 is fixedly connected to the lower surface of the fixing ring 37.

[0047] When the tension spring 45 is compressed and the unblocking liquid is sprayed out, the multiple positioning plates 54 inside the heating sleeve 4 shrink toward the inside of the fixed sleeve 3 along with the heating sleeve 4, and press against the extrusion block 52 on the connecting rod 521, and slide against the inclined surface of the extrusion block 52, so that the multiple positioning plates 54 stretch the compression spring 53 at the same time to slide, so that the blade 55 on one side of the positioning plate 54 extends out of the heating sleeve 4 and contacts the surrounding impurities, and under the action of rotation, it can cut and crush the surrounding impurities that are not easy to melt, thereby improving the overall unblocking effect. At the same time, the obliquely arranged blade 55 generates a component force along the axial direction of the heating sleeve 4 during the rotation process, which helps The auxiliary heating sleeve 4 as a whole can drill into the impurities more easily and melt them, thereby improving the efficiency of blockage removal. At the same time, the blade 55 is made of diamond material, which has extremely high strength and thermal conductivity. Most of the fixed impurities around it can be broken during rotation. Its high thermal conductivity enables it to absorb heat from the heating sleeve 4, and during the rotation and crushing process, the heat of the blade 55 itself will melt the impurities around it. While rotating, it continuously changes the position of extending into the interior of the impurities and making contact with different positions, thereby increasing the contact area, heating and melting the inside of the impurities that the heating sleeve 4 cannot reach, thereby improving the overall blockage removal effect.

[0048] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure oil and gas underground electric heating unblocking device, comprising a fixing seat (1) and a fixing sleeve (3) and a heating sleeve (4) arranged on the fixing seat (1), characterized in that: A plurality of support rods (11) are mounted on the lower end of the fixing seat (1), a support sleeve (12) is mounted on the outer wall of the support rod (11), a positioning bolt (13) is mounted on the inner wall of the support rod (11), a fixing frame (14) and an electrical cabinet (19) are mounted on the upper surface of the fixing seat (1), a motor (15) is mounted on the upper end of the fixing frame (14), a screw rod (16) is mounted on the inner wall of the fixing frame (14), a slide plate (18) is mounted on the outer wall of the screw rod (16), a gear (161) is mounted on the side wall of the screw rod (16), a gear ring (17) is mounted on the upper surface of the fixing seat (1) close to the gear (161), a blowout preventer (2) is mounted on the lower outer wall of the fixing seat (1), and a sealing plate (21) is mounted on the lower end of the blowout preventer (2); The fixing sleeve (3) is mounted on the inner wall of the fixing seat (1) and the blowout preventer (2); a rotating joint (39) is mounted on the upper end of the fixing sleeve (3); heating cables (432) are mounted on both ends of the rotating joint (39); one end of the heating cable (432) is connected to the electrical cabinet (19); and a fixing ring (37) is mounted on the inner wall of the fixing sleeve (3); The heating sleeve (4) is mounted on the inner wall of the fixing sleeve (3) near the lower end; a positioning ring (41) is mounted on the inner wall of the heating sleeve (4); a mounting seat (43) fixedly connected to the lower end of the heating cable (432) is mounted at the lower end of the positioning ring (41); a plurality of heating tubes (431) are mounted at the lower end of the mounting seat (43); a tension spring (45) is mounted at the upper end of the positioning ring (41); and a plurality of drill bits (46) are mounted on the lower end side wall of the heating sleeve (4).

2. A high-pressure oil and gas underground electric heating plugging removal device according to claim 1, characterized in that: The upper end of the support rod (11) is fixedly connected to the lower surface of the fixing seat (1), the outer wall of the support rod (11) is slidably connected to the inner wall of the support sleeve (12), and the outer wall of the positioning bolt (13) is threadedly connected to the inner wall of the fixing seat (1), the support rod (11) and the support sleeve (12) respectively.

3. A high-pressure oil and gas underground electric heating unblocking device according to claim 2, characterized in that: The output end of the motor (15) is fixedly connected to the upper end of the screw rod (16), the side walls at both ends of the screw rod (16) are rotatably connected to the inner wall of the fixing frame (14) and the fixing seat (1), and the inner wall of the slide plate (18) is threadedly connected to the outer wall of the screw rod (16).

4. A high-pressure oil and gas downhole electric heating plugging removal device according to claim 3, characterized in that: The gear (161) and the gear ring (17) are meshedly connected, a limit ring (171) is mounted at the lower end of the gear ring (17) and is rotatably connected to the inner wall of the fixing seat (1), four axially symmetrical sliders (172) are mounted on the inner wall of the limit ring (171), and a plurality of slide grooves (31) are slidably connected to the sliders (172) are formed on the side wall of the fixing sleeve (3).

5. A high-pressure oil and gas underground electric heating plugging removal device according to claim 4, characterized in that: The side wall of the rotary joint (39) is fixedly connected to the inner wall of the slide plate (18); the portion of the rotary joint (39) close to the lower end of the slide plate (18) can rotate; the lower end of the rotary joint (39) is sealed and fixed to the upper end of the fixed sleeve (3); the outer wall of the fixed sleeve (3) is slidably connected to the inner wall of the blowout preventer (2); the upper end of the blowout preventer (2) is fixed to the lower surface of the fixing seat (1) by bolts; the lower end of the blowout preventer (2) is fixedly connected to the sealing plate (21) by bolts; the inner wall of the sealing plate (21) is slidably connected to the outer wall of the fixed sleeve (3); and the lower surface of the sealing plate (21) is tightly fixed to the ground around the wellhead.

6. A high-pressure oil and gas underground electric heating plugging removal device according to claim 5, characterized in that: The outer wall of the heating sleeve (4) is slidably connected to the inner wall of the fixed sleeve (3), the mounting seat (43) is electrically connected to the heating tube (431) and the heating cable (432), and the side walls at both ends of the tension spring (45) are fixedly connected to the positioning ring (41) and one end of the fixing ring (37), respectively.

7. The high-pressure oil and gas downhole electric heating plugging removal device according to claim 1 is characterized in that: The upper end of the positioning ring (41) is fixedly connected with a sliding sleeve (42), the heating cable (432) is placed inside the sliding sleeve (42), the upper end of the fixing sleeve (3) is provided with a limiting groove (32) slidably connected to the inner wall of the sliding sleeve (42), the outer wall of the heating sleeve (4) is installed with a piston ring (412), the side wall of the heating sleeve (4) is provided with a plurality of guide holes (411) above the piston ring (412), and the inner wall of the fixing sleeve (3) is provided with a plurality of liquid outlet holes (38) inclined downward toward the outer wall.

8. A high-pressure oil and gas underground electric heating plugging removal device according to claim 7, characterized in that: The fixing ring (37) is provided with a plurality of liquid inlet holes (371), and the upper side walls of the fixing sleeve (3) are respectively provided with a liquid inlet pipe (33) and an air inlet pipe (34), the liquid inlet pipe (33) is provided with a valve (35), and the air inlet pipe (34) is provided with a one-way valve (36).

9. The high-pressure oil and gas downhole electric heating plugging removal device according to claim 1, characterized in that: A cutting assembly (5) is installed inside the heating sleeve (4), and the cutting assembly (5) comprises an extrusion rod (51), an extrusion block (52), a connecting rod (521), a compression spring (53), a positioning plate (54) and a blade (55). A heat-conducting sleeve (44) for protecting the heating tube (431) is installed at the bottom end of the interior of the heating sleeve (4).

10. A high-pressure oil and gas underground electric heating plugging removal device according to claim 9, characterized in that: The surrounding side walls of the heating sleeve (4) are respectively fixedly connected to the side walls of one end of four compression springs (53), the side walls of the other end of the compression springs (53) are fixedly connected to the outer wall of the positioning plate (54), the outer wall of the other side of the positioning plate (54) is fixedly connected to one end of the blade (55), the blade (55) is designed to be inclined downward, the outer wall of the blade (55) is slidably connected to the inner wall of the heating sleeve (4), the extrusion blocks (52) and the positioning plates (54) are a group, the extrusion blocks (52) of the same group are installed above the positioning plate (54), and the multiple extrusion blocks (52) are fixed in the vertical direction by connecting rods (521), the upper end of the uppermost extrusion block (52) is installed with an extrusion rod (51) slidably connected to the positioning ring (41), and the upper end of the extrusion rod (51) is fixedly connected to the lower surface of the fixing ring (37).

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