A viscosity-reducing device for heavy oil in fractured reservoirs using electric heating

Abstract

This invention discloses an electric heating viscosity-reducing device suitable for heavy oil in fractured reservoirs, relating to the field of heavy oil extraction technology. The invention includes a multi-layer heating pipe assembly consisting of an outer cylinder, an intermediate cylinder, and a heating cylinder, with a steam flow path constructed by an injection spiral plate and an exhaust spiral plate. An electric heating wire is installed inside the heating cylinder for synergistic heating. Multiple heating pipe assemblies are sealed in series via connecting female and male connectors, with the sucker pipe and isolation pipe coaxially connected and equipped with conductive contacts. A drainage assembly is installed at the bottom to collect and automatically drain condensate, preventing water-oil mixing. The assembly and disassembly mechanism enables the batch automatic assembly and disassembly of multiple screws via a synchronous rotating sliding mechanism, improving operational efficiency.

Description

Technical Field

[0001] This invention relates to the field of heavy oil extraction technology, specifically to an electric heating viscosity reduction device suitable for heavy oil in fractured reservoirs. Background Technology

[0002] Currently, in the extraction of heavy oil from fractured reservoirs, most common viscosity reduction methods rely on a single electric heating structure. This involves placing a metal tube with an electrically heated wire inside the wellbore, continuously inputting electrical energy to heat the heavy oil, reducing its viscosity before extraction. However, when the well section is deep or the fracture distribution is extensive, relying solely on electric heating leads to a significant increase in power consumption and a decrease in thermal efficiency. Furthermore, the heating wire is prone to burnout from prolonged operation, making maintenance inconvenient. Some technologies attempt to use steam injection to assist heating, but the condensed water from the steam often mixes directly with the crude oil, increasing the water content and affecting subsequent separation. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a device for reducing viscosity by electric heating of heavy oil in fractured reservoirs, comprising a heating pipe assembly, the heating pipe assembly including an outer cylinder, an intermediate cylinder coaxially disposed on the inner side of the outer cylinder, a heating cylinder coaxially disposed on the inner side of the intermediate cylinder, an electric heating wire embedded in the heating cylinder, wherein the inner wall of the outer cylinder and the outer circumferential surface of the intermediate cylinder are fixedly connected by an exhaust spiral plate, wherein the inner wall of the intermediate cylinder and the outer circumferential surface of the heating cylinder are fixedly connected by an injection spiral plate; wherein a drain pipe is disposed between the inner wall of the intermediate cylinder and the outer surface of the heating cylinder, the drain pipe is disposed along the axial direction of the heating cylinder, and the drain pipe passes through and is fixed to the injection spiral plate; adjacent heating pipe assemblies are connected by a connecting part, and the bottom heating pipe assembly is connected to a drain assembly through the connecting part.

[0004] Preferably, the connecting part includes a connecting female and a connecting male, which are respectively fixed to the outer cylinders of the two heating pipe assemblies to be connected; wherein a female intermediate isolation pipe is suspended and fixed at a coaxial position inside the female, and an inner oil extraction pipe of the female is suspended and fixed at a coaxial position inside the female intermediate isolation pipe; wherein a male intermediate isolation pipe is suspended and fixed at a coaxial position inside the male intermediate isolation pipe, and an inner oil extraction pipe of the male is suspended and fixed at a coaxial position inside the male intermediate isolation pipe.

[0005] Preferably, the inner oil extraction pipe of the male seat is coaxially aligned with the inner oil extraction pipe of the female seat, and the inner oil extraction pipe of the male seat and the inner oil extraction pipe of the female seat are in contact and sealed together. The intermediate isolation pipe of the female seat and the intermediate isolation pipe of the male seat are coaxially aligned, and the intermediate isolation pipe of the female seat and the intermediate isolation pipe of the male seat are in contact and sealed together. The inner oil extraction pipe of the male seat and the inner oil extraction pipe of the female seat are respectively fixedly and sealed together with the heating cylinder in the corresponding heating pipe assembly. The intermediate isolation pipe of the female seat and the intermediate isolation pipe of the male seat are respectively fixedly and sealed together with the intermediate cylinder in the corresponding heating pipe assembly.

[0006] Preferably, the circumferential surface of the female connector is provided with multiple connector slots, and the male connector is fixedly provided with a connector plug that can be inserted into the connector slot. Each corresponding connector plug and connector slot is provided with aligned threaded holes, and screws can be threaded into the threaded holes to connect and fix the connector plug and connector slot.

[0007] Preferably, it further includes a disassembly and assembly assembly, which includes a disassembly and assembly base, on which a disassembly and assembly panel is fixedly mounted. Multiple electric screwdriver slide holders are fixedly mounted on the disassembly and assembly panel. Each electric screwdriver slide holder has an electric screwdriver slidably mounted along the radial direction of the disassembly and assembly panel. Each electric screwdriver slide holder has a sliding pin guide groove formed along the radial direction of the disassembly and assembly panel, and a sliding pin fixedly engaged with the electric screwdriver is slidably mounted in each sliding pin guide groove. A synchronous rotating disk is rotatably mounted on the lower surface of the disassembly and assembly panel. The synchronous rotating disk has multiple inclined synchronous rotating grooves, in which the sliding pins are slidably disposed.

[0008] Preferably, a bit is fixedly mounted on the output shaft of the electric screwdriver; multiple screw placement slots are also fixedly mounted on the mounting panel, with screws stacked in the slots. The axis of the screws is parallel to the radial direction of the connecting female seat, and a through hole is provided at the bottom of the screw placement slot along the axis of the screw, allowing the screw to pass through; a screw separation baffle is fixedly mounted at the bottom of the screw placement slot to block the screw; a screw slip cover is provided below the screw separation baffle and fixed to the mounting base. The electric screwdriver has a torque adjustment function, meaning that when the screw is tightened, the output shaft of the electric screwdriver no longer drives the bit or screw to rotate. By manually pushing the electric screwdriver or using an electric telescopic rod, the electric screwdriver is driven to slide along the electric screwdriver sliding frame, and then, through the cooperation of the sliding pin and the synchronous rotating inclined groove, all the electric screwdrivers move synchronously. Specifically, the sliding pin slides within the synchronous rotating slant, causing the synchronous rotating disk to rotate. Then, the synchronous rotating slant in other positions reverses this, causing the corresponding sliding pins to slide within the sliding pin guide groove, thus driving all the electric screwdrivers to slide on the electric screwdriver slide holder. When the male and female connectors are mated, the corresponding connector plug is inserted into the connector slot, aligning the corresponding threaded hole with the screwdriver bit. The electric screwdriver pushes the screwdriver bit, causing it to push against the bottom screw in the screw placement slot towards the threaded hole of the connector plug and connector slot (the screwdriver bit and screw are magnetically engaged). Simultaneously, the electric screwdriver is activated, and its output shaft, through the screwdriver bit, drives the screw into the threaded hole. During disassembly, the output shaft of the electric screwdriver is rotated in the opposite direction to remove the screw from the threaded hole (at this point, there are no remaining screws in the screw placement slot). When the screw separates from the threaded hole, it is magnetically attached to the screwdriver bit until it contacts the screw separation baffle. The screw separation baffle blocks the screw, causing it to detach from the screwdriver bit and fall onto the screw drop cover.

[0009] Preferably, the drainage assembly includes an outer connecting cover fixedly connected to the connecting female seat, an exhaust limiting pipe is fixedly suspended at a coaxial position inside the outer connecting cover, the exhaust limiting pipe is fixedly and sealedly connected to the intermediate isolation pipe of the female seat, and a bottom oil extraction pipe is fixedly and sealedly connected to the inner oil extraction pipe of the female seat at a coaxial position inside the exhaust limiting pipe.

[0010] Preferably, the drainage assembly further includes a water storage tank, which is fixedly and sealed with the outer connecting cover and the bottom oil extraction pipe, and the bottom end of the drain pipe extends to the bottom of the inside of the water storage tank, and a gap is left between the drain pipe and the bottom surface of the inner wall of the water storage tank.

[0011] Preferably, a bullet is fixedly installed at the bottom of the water storage tank, and an opening is provided at the axis position of the bullet.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) In the process of heavy oil thermal recovery, the present invention no longer relies entirely on electric heating, but achieves viscosity reduction through the combined action of high-temperature steam guided by heating cylinder, electric heating wire and gas injection spiral plate; (2) After the high-temperature steam of the present invention is transferred between the multi-stage heating cylinders, it will naturally condense. If there is no active discharge mechanism, the condensate is easy to deposit and enter the oil production channel, which directly affects the quality of crude oil. The device achieves automatic separation and discharge of condensate through the combined structure of drainage pipe, water storage tank and exhaust restriction surface. When the condensate in the water storage tank accumulates to a certain height, it automatically enters the drainage pipe under the action of gas pressure difference and is finally discharged to the ground, avoiding the mixing of condensate with heavy oil, effectively reducing the water content and improving the quality of produced oil; (3) The steam of the present invention first flows from top to bottom along the gas injection spiral plate, continuously providing heat source to the outer wall of each section of heating cylinder, and then flows back to the exhaust spiral plate through the water storage tank to be discharged upward, realizing a closed loop of "downward heating + upward exhaust". During this process, an automatic steam flow channel section adjustment mechanism is formed between the exhaust limiting surface and the condensate surface, which prevents steam stagnation and avoids blockage or backflow. This helps maintain a stable downhole temperature distribution and heat transfer efficiency, thereby improving the recovery rate of heavy oil. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the screw slippage cover structure of the present invention.

[0015] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle.

[0016] Figure 4 This is a schematic diagram of the connecting part structure of the present invention.

[0017] Figure 5 This is a schematic diagram of the drainage component structure of the present invention.

[0018] Figure 6 This is a schematic diagram of the heating pipe assembly structure of the present invention.

[0019] In the diagram: 101-Outer cylinder; 102-Connecting female connector; 103-Connecting male connector; 104-Connecting plug; 105-Connecting slot; 106-Outer connecting cover; 107-Water reservoir; 108-Bullet head; 109-Bottom oil extraction pipe; 110-Exhaust limiting pipe; 111-Exhaust limiting surface; 112-Drain pipe; 113-Male connector inner oil extraction pipe; 114-Female connector inner oil extraction pipe; 115-Female connector intermediate isolation pipe; 116-Male connector intermediate isolation pipe; 1 17-Intermediate cylinder; 118-Heating cylinder; 119-Exhaust spiral plate; 120-Injection spiral plate; 121-Disassembly / assembly base; 122-Screw sliding cover; 123-Disassembly / assembly panel; 124-Screw placement slot; 125-Screw; 126-Screw separation baffle; 127-Screwdriver bit; 128-Electric screwdriver; 129-Electric screwdriver sliding frame; 130-Synchronous rotating disc; 131-Synchronous rotating inclined groove; 132-Sliding pin; 133-Sliding pin guide groove. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-6 The technical solution of the present invention will be further illustrated through specific embodiments.

[0021] This invention provides an electric heating viscosity reduction device suitable for heavy oil in fractured reservoirs, comprising a heating pipe assembly. The heating pipe assembly includes an outer cylinder 101, an intermediate cylinder 117 coaxially disposed on the inner side of the outer cylinder 101, and a heating cylinder 118 coaxially disposed on the inner side of the intermediate cylinder 117. An electric heating wire is embedded in the heating cylinder 118. The inner wall of the outer cylinder 101 and the outer circumferential surface of the intermediate cylinder 117 are fixedly connected by an exhaust spiral plate 119, and the inner wall of the intermediate cylinder 117 and the outer circumferential surface of the heating cylinder 118 are fixedly connected by an injection spiral plate 120. A drain pipe 112 is disposed between the inner wall of the intermediate cylinder 117 and the outer surface of the heating cylinder 118, the drain pipe 112 being arranged along the axial direction of the heating cylinder 118 and being fixedly mounted on the injection spiral plate 120. Adjacent heating pipe assemblies are connected by a connecting part, and the bottom heating pipe assembly is connected to a drain assembly via the connecting part.

[0022] The connecting part includes a female connector 102 and a male connector 103, which are respectively fixed to the outer cylinders 101 of the two heating pipe assemblies to be connected; wherein a female connector intermediate isolation pipe 115 is suspended and fixed at a coaxial position inside the female connector 102, and an inner female connector oil extraction pipe 114 is suspended and fixed at a coaxial position inside the female connector intermediate isolation pipe 115; wherein a male connector intermediate isolation pipe 116 is suspended and fixed at a coaxial position inside the male connector 103, and an inner male connector oil extraction pipe 113 is suspended and fixed at a coaxial position inside the male connector intermediate isolation pipe 116. The inner oil extraction pipe 113 of the male seat and the inner oil extraction pipe 114 of the female seat are coaxially aligned and sealed together. The intermediate isolation pipe 115 of the female seat and the intermediate isolation pipe 116 of the male seat are coaxially aligned and sealed together. The intermediate isolation pipe 115 of the female seat and the intermediate isolation pipe 116 of the male seat are sealed together. The inner oil extraction pipe 113 of the male seat and the inner oil extraction pipe 114 of the female seat are fixedly sealed together with the heating cylinder 118 in the corresponding heating pipe assembly. The intermediate isolation pipe 115 of the female seat and the intermediate isolation pipe 116 of the male seat are fixedly sealed together with the intermediate cylinder 117 in the corresponding heating pipe assembly. The circumferential surface of the female connector 102 is provided with multiple connector slots 105. The male connector 103 is fixedly provided with a connector plug 104 that can be inserted into the connector slot 105. Each corresponding connector plug 104 and connector slot 105 is provided with aligned threaded holes. A screw 125 can be threaded into the threaded holes. The screw 125 is used to connect and fix the connector plug 104 and connector slot 105.

[0023] It also includes a disassembly and assembly assembly, which includes a disassembly and assembly base 121. A disassembly and assembly panel 123 is fixedly installed on the disassembly and assembly base 121. Multiple electric screwdriver sliding frames 129 are fixedly installed on the disassembly and assembly panel 123. Each electric screwdriver sliding frame 129 has an electric screwdriver 128 slidably installed along the radial direction of the disassembly and assembly panel 123. Each electric screwdriver sliding frame 129 has a sliding pin guide groove 133 opened along the radial direction of the disassembly and assembly panel 123. A sliding pin 132 that is fixedly engaged with the electric screwdriver 128 is slidably installed in each sliding pin guide groove 133. A synchronous rotating disk 130 is rotatably installed on the lower surface of the disassembly and assembly panel 123. The synchronous rotating disk 130 has multiple inclined synchronous rotating grooves 131, and the sliding pins 132 are slidably disposed in the synchronous rotating grooves 131. A screwdriver bit 127 is fixedly mounted on the output shaft of the electric screwdriver 128. Multiple screw placement slots 124 are also fixedly mounted on the mounting / dismounting panel 123, with screws 125 stacked within each slot. The axis of the screws 125 is parallel to the radial direction of the connecting female seat 102, and a through hole is provided at the bottom of the screw placement slot 124 along the axis of the screws 125, allowing the screws 125 to pass through. A screw separation baffle 126 is fixedly mounted at the bottom of the screw placement slot 124 to block the screws 125. A screw slip cover 122 is located below the screw separation baffle 126 and is fixed to the mounting / dismounting base 121. The electric screwdriver 128 has a torque adjustment function, meaning that when the screws 125 are tightened, the output shaft of the electric screwdriver 128 no longer drives the screw bit 127 or the screws 125 to rotate. The electric screwdriver 128 is driven to slide along the electric screwdriver slide frame 129 by manual pushing or using an electric telescopic rod. Then, through the cooperation of the sliding pin 132 and the synchronous rotating groove 131, all the electric screwdrivers 128 move synchronously. Specifically, when the sliding pin 132 slides in the synchronous rotating groove 131, it drives the synchronous rotating disk 130 to rotate. Then, the synchronous rotating grooves 131 in other positions will in turn drive the corresponding sliding pin 132 to slide in the sliding pin guide groove 133, thereby driving all the electric screwdrivers 128 to slide on the electric screwdriver slide frame 129. When the male connector 103 and the female connector 102 are mated, the corresponding connector 104 is inserted into the connector slot 105, and the corresponding threaded hole is aligned with the bit 127. The electric screwdriver 128 is pushed, and the electric screwdriver 128 drives the bit 127 to push the screw 125 at the bottom of the screw placement slot 124 into the threaded hole of the connector 104 and the connector slot 105 (the bit 127 and the screw 125 are magnetically engaged). At the same time, the electric screwdriver 128 is started, and the output shaft of the electric screwdriver 128 drives the screw 125 to be screwed into the threaded hole through the bit 127.During disassembly, the output shaft of the electric screwdriver 128 is rotated in reverse to remove the screw 125 from the threaded hole (at this time, there is no remaining screw 125 in the screw placement slot 124). When the screw 125 separates from the threaded hole, the screw 125 will be magnetically attracted to the bit 127 until the screw 125 contacts the screw separation baffle 126. The screw separation baffle 126 blocks the screw 125, causing the screw 125 to separate from the bit 127. At this time, the screw 125 will fall onto the screw slide cover 122.

[0024] The drainage assembly includes an outer connecting cover 106 fixedly connected to the connecting female seat 102. An exhaust limiting pipe 110 is suspended and fixedly mounted coaxially inside the outer connecting cover 106. The exhaust limiting pipe 110 is fixedly and sealed to the intermediate isolation pipe 115 of the female seat. A bottom oil extraction pipe 109 is suspended and fixedly mounted coaxially inside the exhaust limiting pipe 110. The bottom oil extraction pipe 109 is fixedly and sealed to the inner oil extraction pipe 114 of the female seat. The drainage assembly also includes a water storage tank 107, which is fixedly and sealed to the outer connecting cover 106 and the bottom oil extraction pipe 109. The bottom end of the drain pipe 112 extends to the bottom of the water storage tank 107, and a gap is left between the drain pipe 112 and the bottom surface of the inner wall of the water storage tank 107. A bullet head 108 is fixedly installed at the bottom of the water storage tank 107, and an opening is provided at the axial position of the bullet head 108.

[0025] The working principle of the electric heating viscosity reduction device for heavy oil in fractured reservoirs disclosed in this invention is as follows: Multiple heating pipe assemblies are installed and connected in series using a crane, employing disassembly and assembly components and connecting parts. Initially, a drainage component is installed on the first heating pipe assembly via the connecting part. Conductive contacts are provided at the connection points of the inner sucker pipe 113 of each male connector and the inner sucker pipe 114 of each female connector to supply power to the electric heating wires inside the heating cylinder 118 of all heating pipe assemblies. By heating the heavy oil in the fractured reservoir through electric heating, its viscosity is reduced, increasing its fluidity. However, as well depth increases, relying solely on electric heating will significantly increase power consumption, leading to increased energy consumption for heavy oil extraction. To address this, high-temperature steam can be injected into the space containing the gas injection spiral plate 120 (via the topmost heating pipe assembly, i.e., the bottom heating pipe assembly). This high-temperature steam will flow along the gas injection spiral plate 120 between the heating cylinder 118 and the intermediate cylinder 117 until it reaches the bottommost heating pipe assembly. The high-temperature steam will then heat the heating cylinder 118, working in conjunction with the internal electric heating wires (reducing the energy consumption of the electric heating wires; the heating wires can provide heat to the heating cylinder 118, as can the high-temperature steam. Continuous steam supply slows down the heat loss rate of the heating cylinder 118 itself, thus reducing the need for the electric heating wires to operate continuously, reducing working time and energy consumption. It can also increase the steam temperature, thus replacing the electric heating wires in heating the heavy oil. The choice depends on the specific scenario). Ultimately, the high-temperature steam flows to the bottom water storage tank 107, then flows upwards in the opposite direction, entering the space between the outer cylinder 101 and the intermediate cylinder 117, and spiraling upwards along the exhaust spiral plate 119 before being discharged. During this process, due to the temperature difference, some steam condenses into liquid and falls into the water storage tank 107 under gravity, forming a pool within the tank. The distance between the condensate level in the water storage tank 107 and the exhaust limiting surface 111 gradually decreases. Under normal conditions, steam flows from between the heating cylinder 118 and the intermediate cylinder 117 through the gap between the condensate and the exhaust limiting surface 111 into the space between the outer cylinder 101 and the exhaust spiral plate 119, and then is discharged. However, as the condensate level increases, the gap between the exhaust limiting surface 111 and the condensate becomes smaller, which reduces the cross-sectional area for steam flow. At this time, the pressure above the liquid surface increases (the pressure of the injected steam remains unchanged), and then some of the compressed condensate is squeezed into the drain pipe 112 (a one-way valve is connected in series in the drain pipe 112 to prevent the liquid from flowing downwards in the opposite direction). Then, the gap between the condensate level in the water storage tank 107 and the exhaust limiting surface 111 increases, the cross-sectional area available for steam flow increases, and the pressure recovers. This process repeats itself. Once there is too much condensate in the water storage tank 107, it will be automatically discharged through the drain pipe 112, and finally the condensate will be discharged above the ground.In this way, the moisture produced by the steam will not come into contact with the oil, thereby reducing the water content of the extracted oil.

Claims

1. A device for electrically heating and reducing the viscosity of heavy oil in a multi-fractured reservoir, characterized in that it comprises: The application relates to a heating pipeline assembly, which comprises an outer cylinder (101), an intermediate cylinder (117) arranged at the inner side of the outer cylinder (101) in a coaxial position, a heating cylinder (118) arranged at the inner side of the intermediate cylinder (117) in a coaxial position, and an electric heating wire embedded in the heating cylinder (118), wherein the inner wall of the outer cylinder (101) and the circumferential outer surface of the intermediate cylinder (117) are fixedly connected through exhaust spiral plates (119), and the inner wall of the intermediate cylinder (117) and the circumferential outer surface of the heating cylinder (118) are fixedly connected through gas injection spiral plates (120). A drain pipe (112) is arranged between the inner wall of the intermediate cylinder (117) and the outer surface of the heating cylinder (118), the drain pipe (112) is arranged along the axial direction of the heating cylinder (118), and the drain pipe (112) penetrates through the gas injection spiral plates (120); Two adjacent heating pipeline assemblies are connected through a connecting part, and the lowermost heating pipeline assembly is connected with a drainage assembly through the connecting part. The connecting part comprises a connecting female seat (102) and a connecting male seat (103), and the connecting female seat (102) and the connecting male seat (103) are fixedly connected with the outer cylinders (101) of the two heating pipeline assemblies to be connected. The drainage assembly comprises an outer connecting cover (106) fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), and the outer connecting cover (106) is fixedly connected with the connecting female seat (102).

2. The device for electric heating and viscosity reduction of heavy oil in a multi-fractured reservoir according to claim 1, characterized in that: The connecting female seat (102) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), and the outer connecting cover (106) is fixedly connected with the connecting female seat (102). The connecting female seat (102) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), and the outer connecting cover (106) is fixedly connected with the connecting female seat (102). The connecting female seat (102) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), the outer connecting cover (106) is fixedly connected with the connecting female seat (102), and the outer connecting cover (106) is fixedly connected with the connecting female seat (102).

3. The device for electrically heating and reducing the viscosity of heavy oil in a multi-fractured reservoir according to claim 2, characterized in that: The male seat inner side oil extraction pipe (113) is coaxially aligned with the female seat inner side oil extraction pipe (114), the male seat inner side oil extraction pipe (113) is in sealing contact with the female seat inner side oil extraction pipe (114), the female seat middle isolation pipe (115) is coaxially aligned with the male seat middle isolation pipe (116), and the female seat middle isolation pipe (115) is in sealing contact with the male seat middle isolation pipe (116); wherein the male seat inner side oil extraction pipe (113) and the female seat inner side oil extraction pipe (114) are respectively fixed and sealed with the heating cylinder (118) in the corresponding heating pipe assembly; wherein the female seat middle isolation pipe (115) and the male seat middle isolation pipe (116) are respectively fixed and sealed with the middle cylinder (117) in the corresponding heating pipe assembly.

4. The device for electrically heating and reducing the viscosity of heavy oil in a multi-fractured reservoir according to claim 3, characterized in that: The circumferential surface of the connecting female seat (102) is provided with a plurality of connecting slots (105), and the connecting male seat (103) is fixedly provided with a connecting plug (104) capable of being inserted into the connecting slot (105). Each corresponding connecting plug (104) and connecting slot (105) is provided with a threaded hole aligned and arranged, and a screw (125) can be screwed into the threaded hole. The screw (125) is used to connect and fix the connecting plug (104) and the connecting slot (105).

5. The device for electrically heating and reducing the viscosity of heavy oil in a multi-fractured reservoir according to claim 4, characterized in that: It also includes a disassembly and assembly assembly, which includes a disassembly and assembly seat (121), and the disassembly and assembly seat (121) is fixedly installed with a disassembly and assembly panel (123). The disassembly and assembly panel (123) is fixedly installed with a plurality of electric batch knives sliding frames (129). Each electric batch knife sliding frame (129) is slidingly installed with an electric batch knife (128) along the radial direction of the disassembly and assembly panel (123). Each electric batch knife sliding frame (129) is provided with a sliding pin guide groove (133) along the radial direction of the disassembly and assembly panel (123). Each sliding pin guide groove (133) is slidingly installed with a sliding pin (132) fixedly matched with the electric batch knife (128). The lower surface of the disassembly and assembly panel (123) is rotatably installed with a synchronous rotating disc (130). The synchronous rotating disc (130) is provided with a plurality of inclined synchronous rotating inclined grooves (131). The sliding pin (132) is slidingly arranged in the synchronous rotating inclined groove (131).

6. The device for electrically heating and reducing the viscosity of heavy oil suitable for use in a multi-fractured reservoir according to claim 5, characterized in that: The output shaft of the electric batch knife (128) is fixedly installed with a batch head (127). The disassembly and assembly panel (123) is also fixedly installed with a plurality of screw placing grooves (124) in the air. The screw placing grooves (124) are stacked with screws (125). The axis direction of the screw (125) is parallel to the radial direction of the connecting female seat (102). The bottom end of the screw placing groove (124) is provided with a through hole along the axis direction of the screw (125), which can pass through the screw (125). The bottom of the screw placing groove (124) is fixedly installed with a screw separation baffle (126), which is used to block the screw (125). The screw sliding cover (122) is arranged below the screw separation baffle (126), and the screw sliding cover (122) is fixed on the disassembly and assembly seat (121).

7. The device for electrically heating and reducing the viscosity of heavy oil in a multi-fractured reservoir according to claim 6, characterized in that: The bottom of the water storage tank (107) is fixedly provided with a bullet head (108), and the axis of the bullet head (108) is provided with an opening.

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