Double-hollow sucker rod heating device

Abstract

The utility model relates to the field of oilfield development, in particular to a double-hollow sucker rod heating device which comprises a heating tank, a sucker rod assembly, a stirring assembly, a heating assembly, a flow guide pipe, a threaded sleeve, a feeding hopper, a first hydraulic controller and a liquid discharging pipe. The heat conduction layer and the heat preservation and insulation layer are arranged in the inner pipe and the outer pipe of the sucker rod respectively, heat transfer between a heat carrier and the sucker rod can be enhanced through the heat conduction layer, it is ensured that heat can be efficiently transferred to the underground, heat loss of the heat carrier in the flowing process can be reduced through cooperation of the heat preservation and insulation layer, and the service life of the sucker rod is prolonged. The heating assembly capable of sensing the temperature of the heating carrier in the heating device in real time is arranged, and the heating temperature can be flexibly adjusted according to the actual temperature change of the heat carrier liquid to achieve rapid temperature rise of the heat carrier liquid; and the stirring assembly is arranged, so that the heat carrier liquid flowing back into the heating device can be quickly and uniformly stirred in a rotary stirring mode to accelerate temperature rise.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development, and in particular to a heating device for double hollow sucker rods. Background Technology

[0002] Double hollow sucker rods are important tools for heavy oil extraction, mainly used for extracting high-viscosity, high-pour-point, and high-wax crude oil. Their working principle involves injecting a heat carrier through double hollow channels to heat the wellbore and reduce crude oil viscosity. Utilizing the hollow structure, viscosity-reducing chemicals are injected downhole. The heating device for the double hollow sucker rod primarily uses a heating system to circulate and heat the heat-conducting medium within the rod, thereby reducing crude oil viscosity, improving fluidity, reducing the frequency of well cleaning, and achieving energy conservation and loss reduction.

[0003] Existing double hollow sucker rod heating devices typically rely on the heat transfer process within the sucker rod itself, where the heated heat carrier flows through the tube. This process does not effectively transfer heat to the downhole, resulting in low heat transfer efficiency. Furthermore, the heating device itself cannot promptly adjust the temperature of the heat carrier returning to the device based on its temperature, leading to poor flexibility.

[0004] Therefore, existing double hollow sucker rod heating devices typically rely solely on the tube body for heat conduction during the flow of heated heat carrier within the sucker rod, resulting in low heat transfer efficiency and significant heat loss during the process. Furthermore, the heating device itself lacks flexibility as it cannot promptly adjust the temperature of the heat carrier returning to the device. To address these issues, heat-conducting and insulation layers are installed inside the inner and outer tubes of the sucker rod, respectively. The heat-conducting layer enhances heat transfer between the heat carrier and the sucker rod, ensuring efficient heat transfer to the well. The insulation layer on the outer tube reduces heat loss during flow, effectively improving the heat exchange efficiency between the hot fluid and the downhole heavy oil. A heating component that can sense the temperature of the heat carrier in real time allows for flexible temperature adjustment based on actual temperature changes, enabling rapid heating. Finally, a stirring component rapidly and evenly agitates the heat carrier returning to the device, further accelerating heating and improving the overall heating effect. Utility Model Content

[0005] To overcome the problems of existing double hollow sucker rod heating devices, which typically rely on the heat transfer of the heated heat carrier within the sucker rod for heat conduction only through the pipe itself, resulting in low heat transfer efficiency and significant heat loss during the heat transfer process, and also the inability of the heating device to promptly and effectively adjust the temperature of the heat carrier returning to the device, thus exhibiting poor flexibility.

[0006] The technical solution of this utility model is as follows: a double hollow sucker rod heating device, comprising a heating tank, a sucker rod assembly, a stirring assembly, a heating assembly, a guide pipe, a threaded sleeve, a feed hopper, a first hydraulic controller, and a drain pipe. The left end of the heating tank is provided with a sucker rod assembly for deep-penetrating oil extraction into the wellbore. The sucker rod assembly is connected to the heating tank via the guide pipe. The right end of the guide pipe is fixedly connected to the heating tank, and the lower end of the guide pipe is detachably connected to the sucker rod assembly via a threaded sleeve. A feed hopper for introducing heat transfer fluid is fixedly installed on the upper left side of the heating tank. A stirring assembly for stirring to ensure more uniform heating of the heat transfer fluid is fixedly installed in the upper middle part of the heating tank. A heating assembly for flexibly controlling the temperature of the heat transfer fluid is fixedly installed on the upper front end of the heating tank. A first hydraulic controller for controlling the internal hydraulic pressure of the heating tank is fixedly installed on the lower front end of the heating tank. A drain pipe for discharging the heat transfer fluid is fixedly installed near the bottom of the right end of the heating tank. Control valves for controlling the inflow and outflow of liquid are provided on the outer sides of the guide pipe, the feed hopper, and the drain pipe.

[0007] Preferably, by setting a heat-conducting layer and a thermal insulation layer in the inner and outer tubes of the sucker rod respectively, the heat transfer between the heat carrier and the sucker rod can be enhanced through the heat-conducting layer, ensuring that heat can be efficiently transferred to the downhole. The thermal insulation layer at the outer tube can reduce the heat loss of the heat carrier during its flow, effectively improving the heat exchange efficiency between the hot fluid and the downhole heavy oil. By setting a heating component that can sense the temperature of the heating carrier in the heating device in real time, the heating temperature can be flexibly adjusted according to the actual temperature change of the heat carrier fluid to achieve rapid heating of the heat carrier fluid. By setting a stirring component, the heat carrier fluid flowing back into the heating device can be quickly and evenly stirred by rotation and stirring to accelerate the heating effect.

[0008] Preferably, the sucker rod assembly includes an outer tube, an inner tube, a connecting tube, a first threaded head, a second threaded head, a sealing ring, a second hydraulic controller, a heat-conducting layer, and a thermal insulation layer. The outer tube is sleeved on the outside of the inner tube. The outer tube is used for the flow of oil extracted from the wellbore, and the inner tube is used for the flow of heat carrier fluid. Both the upper and lower ends of the outer tube are fixedly connected to the outside of the inner tube. A heat-conducting layer for enhancing heat conduction is embedded inside the inner tube, and a thermal insulation layer for delaying heat loss is embedded inside the outer tube. Both the upper and lower ends of the inner tube extend to the outside through the upper and lower ends of the outer tube. The upper end of the inner tube is fixedly connected to a first threaded head for threaded connection with the threaded sleeve.

[0009] Preferably, the stirring assembly includes a drive motor, a rotating shaft, a first stirring rod, and a second stirring rod. The upper end of the rotating shaft extends through the heating tank and is fixedly connected to the drive motor for controlling the rotation of the rotating shaft. The outer side of the rotating shaft is linearly distributed and uniformly fixedly installed with first stirring rods for stirring the heat carrier liquid. Four sets of second stirring rods for auxiliary stirring are uniformly fixedly installed on one side of the surface of the first stirring rod. The drive motor drives the rotating shaft to rotate, thereby causing the first stirring rod and the second stirring rod to rotate synchronously to stir the heat carrier liquid.

[0010] Preferably, the heating assembly includes a control module, a heating coil, a temperature sensor, and connecting wires. The heating coil is embedded in the tank of the heating tank, and one end of the heating coil extends through the tank of the heating tank to the outside and is fixedly connected to a control module for controlling the temperature and working status of the heating coil.

[0011] Preferably, a connecting wire is fixedly installed at the lower middle part of the control module. The connecting wire passes through the outside of the heating tank and extends to the inside where a temperature sensor for real-time sensing of changes in the temperature of the heat transfer fluid is fixedly installed. The temperature sensor is electrically connected to the control module through the connecting wire.

[0012] Preferably, the upper ends of the outer tube are fixedly connected to connecting pipes on both sides for draining oil from the outer tube. The end of the connecting pipe away from the outer tube is fixedly connected to a second threaded head for detachable connection with an external oil storage equipment pipeline. Both the first and second threaded heads are fitted with sealing rings to increase the sealing of the connection.

[0013] Preferably, a second hydraulic controller is fixedly installed at the front end of the part of the inner tube that extends into the outer tube and at the front end of the connecting tube to control the hydraulic pressure inside the inner tube and the outer tube respectively, and the liquid flow inside the outer tube and the inner tube is controlled by the second hydraulic controller.

[0014] The beneficial effects of this utility model are:

[0015] 1. By installing a heat-conducting layer and a thermal insulation layer inside the inner and outer tubes of the sucker rod, the heat transfer between the heat carrier and the sucker rod can be enhanced through the heat-conducting layer, ensuring that heat can be efficiently transferred to the downhole. The thermal insulation layer at the outer tube can reduce the heat loss of the heat carrier during its flow, effectively improving the heat exchange efficiency between the hot fluid and the downhole heavy oil. By installing a heating component that can sense the temperature of the heating carrier in the heating device in real time, the heating temperature can be flexibly adjusted according to the actual temperature change of the heat carrier fluid to achieve rapid heating of the heat carrier fluid. By installing a stirring component, the heat carrier fluid flowing back into the heating device can be quickly and evenly stirred by rotation and stirring to accelerate the heating effect. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of the double hollow sucker rod heating device of this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional structural schematic of the heating tank of the double hollow sucker rod heating device of this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural schematic of the sucker rod assembly of the double hollow sucker rod heating device of this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional structural diagram of the outer tube of the double hollow sucker rod heating device of this utility model.

[0020] Figure 5 The diagram shown is an enlarged three-dimensional structural schematic of point A of the double hollow sucker rod heating device of this utility model;

[0021] Figure 6 The diagram shown is a three-dimensional structural schematic of the stirring assembly of the double hollow sucker rod heating device of this utility model.

[0022] Figure 7 The diagram shown is a three-dimensional structural schematic of the heating component of the double hollow sucker rod heating device of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Heating tank; 5. Guide pipe; 6. Threaded sleeve; 7. Feed hopper; 8. First hydraulic controller; 9. Drain pipe; 201. Outer pipe; 202. Inner pipe; 203. Connecting pipe; 204. First threaded head; 205. Second threaded head; 206. Sealing ring; 207. Second hydraulic controller; 208. Heat-conducting layer; 209. Thermal insulation layer; 301. Drive motor; 302. Rotating shaft; 303. First stirring rod; 304. Second stirring rod; 401. Control module; 402. Heating coil; 403. Temperature sensor; 404. Connecting wire. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-2 This utility model provides an embodiment: a double hollow sucker rod heating device, including a heating tank 1, a sucker rod assembly, a stirring assembly, a heating assembly, a guide pipe 5, a threaded sleeve 6, a feed hopper 7, a first hydraulic controller 8, and a drain pipe 9. The left end of the heating tank 1 is provided with a sucker rod assembly for deep-penetrating oil extraction into the wellbore. The sucker rod assembly is connected to the heating tank 1 via the guide pipe 5. The right end of the guide pipe 5 is fixedly connected to the heating tank 1, and the lower end of the guide pipe 5 is detachably connected to the sucker rod assembly via the threaded sleeve 6. A guide pipe 9 is fixedly installed on the upper left side of the heating tank 1. The feed hopper 7 for the heat carrier liquid is fixedly installed at the upper middle part of the heating tank 1. A stirring component for stirring to make the heat carrier liquid heat more evenly is fixedly installed at the upper front part of the heating tank 1. A heating component for flexibly controlling the temperature of the heat carrier liquid is fixedly installed at the lower front part of the heating tank 1. A first hydraulic controller 8 for controlling the hydraulic pressure inside the heating tank 1 is fixedly installed at the lower front part of the heating tank 1. A drain pipe 9 for discharging the heat carrier liquid is fixedly installed at the right end of the heating tank 1 near the bottom. Control valves for controlling the inflow and outflow of liquid are provided on the outside of the guide pipe 5, the feed hopper 7 and the drain pipe 9.

[0026] Please see Figures 3-5 In this embodiment, the sucker rod assembly includes an outer tube 201, an inner tube 202, a connecting tube 203, a first threaded end 204, a second threaded end 205, a sealing ring 206, a second hydraulic controller 207, a heat-conducting layer 208, and a thermal insulation layer 209. The outer tube 201 is sleeved on the outside of the inner tube 202. The outer tube 201 is used for the flow of oil extracted from the wellbore, and the inner tube 202 is used for the flow of the heat transfer fluid. Both the upper and lower ends of the outer tube 201 are fixedly connected to the outside of the inner tube 202. A heat-conducting layer 208 is embedded inside the inner tube 202 to enhance heat conduction, and a thermal insulation layer 209 is embedded inside the outer tube 201 to delay heat loss. Both the upper and lower ends of the inner tube 202 pass through the outer tube 201. The inner tube 202 extends to the outside at both ends. The upper end of the inner tube 202 is fixedly connected to a first threaded head 204 for threaded connection with the threaded sleeve 6. The end of the connecting tube 203 away from the outer tube 201 is fixedly connected to a second threaded head 205 for detachable connection with the external oil storage equipment pipeline. Both the outer sides of the first threaded head 204 and the second threaded head 205 are fitted with sealing rings 206 to increase the sealing of the connection. The front end of the part of the inner tube 202 that extends out of the outer tube 201 and the front end of the connecting tube 203 are fixedly installed with second hydraulic controllers 207 for controlling the hydraulic pressure inside the inner tube 202 and the outer tube 201 respectively. The flow of liquid in the outer tube 201 and the inner tube 202 is controlled by the second hydraulic controllers 207.

[0027] Please see Figure 6 In this embodiment, the stirring assembly includes a drive motor 301, a rotating shaft 302, a first stirring rod 303, and a second stirring rod 304. The upper end of the rotating shaft 302 extends through the heating tank 1 and is fixedly connected to the drive motor 301 for controlling the rotation of the rotating shaft 302. The outer side of the rotating shaft 302 is linearly distributed and uniformly fixedly mounted with the first stirring rod 303 for stirring the heat carrier liquid. Four sets of second stirring rods 304 for auxiliary stirring are uniformly fixedly mounted on one side of the surface of the first stirring rod 303. The drive motor 301 drives the rotating shaft 302 to rotate, thereby driving the first stirring rod 303 and the second stirring rod 304 to rotate synchronously and stir the heat carrier liquid.

[0028] Please see Figure 7 In this embodiment, the heating assembly includes a control module 401, a heating coil 402, a temperature sensor 403, and a connecting wire 404. The heating coil 402 is embedded in the tank body of the heating tank 1. One end of the heating coil 402 extends through the tank body of the heating tank 1 to the outside and is fixedly connected to the control module 401 for controlling the temperature and working state of the heating coil 402. The connecting wire 404 is fixedly installed in the middle of the lower end of the control module 401. The connecting wire 404 extends through the outside of the tank body of the heating tank 1 to the inside and is fixedly installed to the temperature sensor 403 for real-time sensing of temperature changes of the heat transfer fluid. The temperature sensor 403 is electrically connected to the control module 401 through the connecting wire 404.

[0029] When working, first move the device to the corresponding stable position and place it there.

[0030] Open the control valve on the outside of the feed hopper 7 at the top of the heating tank 1 to introduce the heat carrier liquid into the heating tank 1, and then close the control valve on the outside of the feed hopper 7.

[0031] The heat carrier liquid in the heating tank 1 is then heated by the heating component, and the heating coil 402 is heated by the control module 401.

[0032] Meanwhile, during the heating process, the heat carrier liquid in the heating tank 1 is stirred by the stirring assembly to accelerate the stirring. The drive motor 301 drives the rotating shaft 302 to drive the first stirring rod 303 and the second stirring rod 304 to rotate and stir the liquid.

[0033] The sucker rod assembly is connected to the heating tank 1, and the first threaded head 204 at the upper end of the sucker rod assembly is connected and fixed together with the threaded sleeve 6 at the lower end of the guide tube 5.

[0034] Then, the second threaded heads 205 at both ends of the upper left and right of the sucker rod assembly are connected and fixed to the pipeline of the external oil storage equipment. The sucker rod assembly is then placed into the wellbore for oil extraction. The hydraulic pressure at the outer pipe 201 is adjusted by the second hydraulic controller 207 outside the connecting pipe 203 to draw oil from the wellbore into the outer pipe 201 and then into the pipeline of the external oil storage equipment through the connecting pipe 203. Finally, the oil enters the oil storage equipment for storage.

[0035] During the oil extraction process of the sucker rod assembly, the control valve on the outside of the guide tube 5 is opened, and the first hydraulic controller 8 and the second hydraulic controller 207 on the outside of the upper end of the inner tube 202 cooperate to guide the heated heat carrier liquid in the heating tank 1 to the bottom of the inner tube 202. The heat carrier liquid is then allowed to flow up and down along the inner tube 202 or back into the heating tank 1, continuously transferring heat to the oil in the outer tube 201 to promote the flow of the oil.

[0036] During the heat transfer process of the heat carrier, the heat transfer efficiency is enhanced by the heat-conducting layer 208 at the inner tube 202, and the heat loss is reduced by the heat insulation layer 209 at the outer tube 201.

[0037] During the operation of the heating component, the temperature sensor 403 senses the temperature change of the liquid in the heating tank 1 in real time. When the temperature of the liquid flowing back into the heating tank 1 is lower than the set value, the control module 401 will be automatically triggered to control the heating coil 402 to heat the liquid in the tank to achieve rapid heating.

[0038] Through the above steps, by setting a heat-conducting layer 208 and a thermal insulation layer 209 in the inner tube 202 and outer tube 201 of the sucker rod respectively, the heat-conducting layer 208 can enhance the heat transfer between the heat carrier and the sucker rod, ensuring that heat can be efficiently transferred to the well. The thermal insulation layer 209 at the outer tube 201, in conjunction with the heat insulation layer 209, can reduce heat loss of the heat carrier during its flow, effectively improving the heat exchange efficiency between the hot fluid and the downhole heavy oil. By setting a heating component that can sense the temperature of the heating carrier in the heating device in real time, the heating temperature can be flexibly adjusted according to the actual temperature changes of the heat carrier fluid to achieve rapid heating of the heat carrier fluid. Rapid heating is achieved by incorporating a stirring assembly that rapidly and evenly agitates the heat transfer fluid returning to the heating device, resulting in better heating performance. This addresses the shortcomings of existing double hollow sucker rod heating devices, which typically rely solely on the pipe body for heat conduction during the flow of heated heat transfer fluid within the sucker rod. This inefficient heat transfer leads to significant heat loss and lacks flexibility as the heating device cannot adjust its heating based on the temperature of the heat transfer fluid returning to the device.

Claims

1. A heating device for double hollow sucker rods, comprising a heating tank (1); characterized in that: It also includes a sucker rod assembly, a stirring assembly, a heating assembly, a guide pipe (5), a threaded sleeve (6), a feed hopper (7), a first hydraulic controller (8), and a drain pipe (9). The left end of the heating tank (1) is provided with a sucker rod assembly for deep oil extraction into the wellbore. The sucker rod assembly is connected to the heating tank (1) through the guide pipe (5). The right end of the guide pipe (5) is fixedly connected to the heating tank (1). The lower end of the guide pipe (5) is detachably connected to the sucker rod assembly through the threaded sleeve (6). The upper left part of the heating tank (1) is fixedly equipped with a feed hopper (7) for introducing heat carrier liquid. A stirring assembly for stirring to make the heat carrier liquid more evenly heated is fixedly installed in the middle of the upper end of the heating tank (1). A heating assembly for controlling the temperature of the heat carrier liquid is fixedly installed in the upper front end of the heating tank (1). A first hydraulic controller (8) for controlling the hydraulic pressure inside the heating tank (1) is fixedly installed in the lower front end of the heating tank (1). A drain pipe (9) for discharging the heat carrier liquid is fixedly installed in the right end of the heating tank (1) near the bottom. Control valves for controlling the inflow and outflow of liquid are provided on the outside of the guide pipe (5), the feed hopper (7) and the drain pipe (9).

2. The heating device for a double hollow sucker rod according to claim 1, characterized in that: The sucker rod assembly includes an outer tube (201), an inner tube (202), a connecting tube (203), a first threaded end (204), a second threaded end (205), a sealing ring (206), a second hydraulic controller (207), a heat-conducting layer (208), and a thermal insulation layer (209). The outer tube (201) is sleeved on the outside of the inner tube (202). The outer tube (201) is used for the flow of oil extracted from the wellbore, and the inner tube (202) is used for the flow of the heat transfer fluid. Both the upper and lower ends are fixedly connected to the outside of the inner tube (202). The inner tube (202) has a heat-conducting layer (208) embedded inside to enhance heat conduction. The outer tube (201) has a heat-insulating layer (209) embedded inside to delay heat loss. Both the upper and lower ends of the inner tube (202) extend to the outside through the upper and lower ends of the outer tube (201). The upper end of the inner tube (202) is fixedly connected to a first threaded head (204) for threaded connection with the threaded sleeve (6).

3. The heating device for a double hollow sucker rod according to claim 1, characterized in that: The stirring assembly includes a drive motor (301), a rotating shaft (302), a first stirring rod (303), and a second stirring rod (304). The upper end of the rotating shaft (302) extends through the heating tank (1) and is fixedly connected to the drive motor (301) for controlling the rotation of the rotating shaft (302). The outer side of the rotating shaft (302) is linearly distributed and uniformly fixedly installed with the first stirring rod (303) for stirring the heat carrier liquid. Four sets of second stirring rods (304) for auxiliary stirring are uniformly fixedly installed on one side of the surface of the first stirring rod (303). The drive motor (301) drives the rotating shaft (302) to rotate, thereby driving the first stirring rod (303) and the second stirring rod (304) to rotate synchronously to stir the heat carrier liquid.

4. The heating device for a double hollow sucker rod according to claim 1, characterized in that: The heating assembly includes a control module (401), a heating coil (402), a temperature sensor (403), and a connecting wire (404). The heating coil (402) is embedded in the tank of the heating tank (1). One end of the heating coil (402) extends through the tank of the heating tank (1) to the outside and is fixedly connected to the control module (401) for controlling the temperature and working status of the heating coil (402).

5. The heating device for a double hollow sucker rod according to claim 4, characterized in that: A connecting wire (404) is fixedly installed at the lower middle part of the control module (401). The connecting wire (404) extends through the outside of the heating tank (1) and into the inside, where a temperature sensor (403) is fixedly installed for real-time sensing of the temperature change of the heat transfer fluid. The temperature sensor (403) is electrically connected to the control module (401) through the connecting wire (404).

6. The heating device for a double hollow sucker rod according to claim 2, characterized in that: The upper ends of the outer tube (201) are fixedly connected to the connecting tubes (203) on both sides, which are arranged opposite to each other, for exporting oil from the outer tube (201). The end of the connecting tube (203) away from the outer tube (201) is fixedly connected to the second threaded head (205) for detachable connection with the pipeline of the external oil storage equipment. The outer sides of the first threaded head (204) and the second threaded head (205) are both fitted with sealing rings (206) to increase the sealing of the connection.

7. The heating device for a double hollow sucker rod according to claim 2, characterized in that: The front end of the inner tube (202) extending into the outer tube (201) and the front end of the connecting tube (203) are both fixedly equipped with a second hydraulic controller (207) for controlling the hydraulic pressure inside the inner tube (202) and the outer tube (201) respectively. The flow of liquid in the outer tube (201) and the inner tube (202) is controlled by the second hydraulic controller (207).

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