Shaft self-heating balance heat preservation system based on super-long gravity heat pipe type hollow sucker rod

Abstract

The invention discloses a shaft self-heating balance heat preservation system based on an ultra-long gravity heat pipe type hollow sucker rod. The shaft self-heating balance heat preservation system comprises an oil pipe, the ultra-long gravity heat pipe type hollow sucker rod, a beam-pumping unit, a pump cylinder, a working medium liquid storage tank and a working medium pump. The super-long gravity heat pipe type hollow sucker rod is arranged in the oil pipe, and the top of the super-long gravity heat pipe type hollow sucker rod extends out of the oil pipe and is provided with a liquid passing opening. The beam-pumping unit is provided with a lifting transmission device, and the transmission end of the lifting transmission device is connected with the top end of the super-long gravity heat pipe type hollow sucker rod. The pump cylinder is mounted at the bottom of the super-long heat pipe type hollow sucker rod; a liquid working medium is stored in the working medium liquid storage tank, the working medium pump is arranged at a liquid outlet of the working medium liquid storage tank, and an outlet of the working medium pump is communicated with the liquid passing opening. The liquid working medium is transmitted into the super-long gravity heat pipe type hollow sucker rod through the working medium liquid storage tank, heat of a high-temperature oil layer is transmitted to a low-temperature oil layer in an effective heat transfer mode, self-heat balance in a shaft oil pipe is achieved, and the effect of saving energy is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil extraction heating devices, and particularly relates to a wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod. Background Art

[0002] In the initial stage of oilfield exploitation, the energy of the formation oil reservoir is usually relied on to achieve self-flowing oil production. The common mechanical oil production methods in the prior art mainly include: electric submersible pump oil production, screw pump oil production, jet pump oil production, and beam pumping unit rod pump oil production. Among them, the beam pumping unit, with its characteristics of fatigue reliability and durability, accounts for about 90% of the application scale of mechanical oil production and is the dominant model of mechanical oil production.

[0003] The heating problem in the process of mechanical oil extraction of petroleum mainly involves the viscosity and fluidity of crude oil in the wellbore. Crude oil is usually in a relatively high-temperature environment in the underground reservoir, but after being extracted to the surface, due to the temperature drop, the viscosity of the crude oil increases significantly, resulting in a decrease in its fluidity in the pipeline. High-viscosity crude oil is difficult to flow in the pipeline, leading to a reduction in oil production efficiency. In addition, under low-temperature conditions, some components in the crude oil may crystallize into waxy substances and deposit on the pipeline wall to form wax scale, increasing the difficulty of oil production.

[0004] The existing beam pumping rod oil production device usually uses the method of electric heating of hollow sucker rods to solve the problems of wax deposition and fluidity of crude oil. However, due to the large length of the sucker rod, the electric heating method often has problems such as high energy consumption, high equipment cost, and cumbersome maintenance. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod to solve the problems of complex heating device structure and energy waste in the existing beam pumping rod oil extraction method.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod, comprising an oil pipe, an ultra-long gravity heat pipe type hollow sucker rod, a beam pumping unit, a pump barrel, a working fluid storage tank and a working fluid pump; the oil pipe is arranged below the ground surface, both the upper and lower ends of the oil pipe are sealed, part of the oil pipe protrudes out of the ground surface, and an oil outlet is arranged at the top of the oil pipe; the ultra-long gravity heat pipe type hollow sucker rod is arranged inside the oil pipe, the top end of the ultra-long heat pipe type hollow sucker rod extends out of the oil pipe, and a liquid passage port is arranged at the top of the ultra-long gravity heat pipe type hollow sucker rod; the beam pumping unit is arranged on the ground surface, the beam pumping unit is provided with a lifting transmission device, and the transmission end of the lifting transmission device is connected to the top end of the ultra-long gravity heat pipe type hollow sucker rod; the pump barrel is installed at the bottom of the ultra-long heat pipe type hollow sucker rod, and the outer peripheral surface of the pump barrel approaches the inner peripheral surface of the oil pipe; the working fluid storage tank is arranged on the ground surface, a liquid working fluid is stored in the working fluid storage tank, the working fluid storage tank is provided with a liquid outlet, the working fluid pump is arranged at the liquid outlet, and the outlet of the working fluid pump is connected to the liquid passage port;

[0008] The liquid working fluid is introduced into the ultra-long gravity heat pipe type hollow sucker rod through the working fluid pump. The fluid at the bottom of the oil pipe transfers heat to the bottom of the ultra-long gravity heat pipe type hollow sucker rod. The liquid working fluid in the ultra-long gravity heat pipe type hollow sucker rod absorbs heat through phase change and vaporizes to form a gaseous working fluid. The high-temperature gas moves upward driven by the pressure difference inside the ultra-long gravity heat pipe type hollow sucker rod. When the high-temperature gas is close to the ground surface, it phase-changes back to a liquid working fluid inside the ultra-long gravity heat pipe type hollow sucker rod and releases heat. The released heat heats the crude oil inside the oil pipe close to the ground surface. The liquid working fluid flows back to the bottom of the ultra-long gravity heat pipe type hollow sucker rod driven by gravity for circulation.

[0009] Further, a fluid passage valve is arranged at the liquid passage port of the ultra-long gravity heat pipe type hollow sucker rod. The fluid passage valve is used to discharge the non-condensable gas and the introduced liquid working fluid inside the ultra-long gravity heat pipe type hollow sucker rod, or to introduce the liquid working fluid.

[0010] Further, a working fluid valve is arranged at the outlet of the working fluid pump. The working fluid valve is used to open and close the working fluid pump to discharge the liquid working fluid in the working fluid storage tank into the ultra-long gravity heat pipe type hollow sucker rod.

[0011] Further, it further comprises a movable hose. The two ends of the movable hose are respectively connected to the fluid passage valve and the working fluid valve. The movable hose is used to connect the working fluid storage tank and the ultra-long gravity heat pipe type hollow sucker rod.

[0012] Further, a pressure sensor is arranged at the top of the ultra-long gravity heat pipe type hollow sucker rod. The sensing end of the pressure sensor is located inside the ultra-long gravity heat pipe type hollow sucker rod. The pressure sensor is used to detect the vacuum degree inside the pipe before the ultra-long gravity heat pipe type hollow sucker rod works, and is also used to detect the pressure inside the pipe when the ultra-long gravity heat pipe type hollow sucker rod works.

[0013] Further, a liquid level sensor is provided at the bottom inside the ultra-long gravity heat pipe type hollow sucker rod, and the liquid level sensor is used to detect the liquid level height of the liquid working medium inside the pipe when the ultra-long gravity heat pipe type hollow sucker rod is working.

[0014] Further, the working medium in the liquid working medium and the gaseous working medium includes distilled water, ammonia, carbon dioxide, and organic working media.

[0015] Further, a flexible seal is provided at the through position between the top of the ultra-long gravity heat pipe type hollow sucker rod and the tubing, so as to maintain the sealing performance of the through position between the ultra-long gravity heat pipe type hollow sucker rod and the tubing when the ultra-long gravity heat pipe type hollow sucker rod moves up and down.

[0016] Further, the driving end of the lifting transmission device is connected to the top end of the ultra-long gravity heat pipe type hollow sucker rod through a strength rod, and the ultra-long gravity heat pipe type hollow sucker rod is driven to move up and down by the lifting transmission device through the strength rod.

[0017] The present invention has the following beneficial effects:

[0018] 1. By providing a tubing, an ultra-long gravity heat pipe type hollow sucker rod, a beam pumping unit, a pump barrel, a working medium storage tank, and a working medium pump, the working medium storage tank transmits a fixed amount of liquid working medium into the ultra-long gravity heat pipe type hollow sucker rod through the working medium pump. Using the heat of the underground crude oil itself as a heat source, the working medium is vaporized into a gaseous working medium by absorbing heat in the lower part (evaporation section) inside the ultra-long gravity heat pipe type hollow sucker rod, and then rises to the upper part (condensation section) to be liquefied back into a liquid working medium and releases heat to heat the upper crude oil, so that the heat of the ultra-long gravity heat pipe type hollow sucker rod maintains a stable self-heat balance state. Compared with the prior art of heating crude oil by electric heating during oil production, the present invention realizes energy consumption savings by adopting the method of introducing a liquid working medium inside the ultra-long gravity heat pipe type hollow sucker rod, and has the advantages of stable and efficient heat transfer.

[0019] 2. The system structure of the present invention is simple, and heating of a low-temperature oil layer can be realized without additional energy-consuming devices. This solves the problems of high cost and difficult maintenance existing in the traditional hollow sucker rod electric heating device, and improves the reliability and economy of the beam pumping unit oil production system.

[0020] 3. The movable connecting hose in the device is combined with the beam pumping unit, and the flow rate of the working medium inside the pipe is flexibly adjusted by adjusting the opening degree of the working medium valve or the fluid passing valve to adapt to the change of the wellbore heat load during the oil production process. This flexibility enables the system to be adjusted in time under different working conditions, improving the adaptability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] In the figure: 1. Working fluid storage tank; 2. Working fluid pump; 3. Working fluid valve; 4. Movable hose; 5. Fluid passing valve; 6. Pressure sensor; 7. Beam pumping unit; 8. Oil pipe; 9. Ultra-long gravity heat pipe type hollow sucker rod; 10. Liquid level sensor; 11. Pump barrel. Specific embodiments

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Terms such as "upper", "inner", "middle", "left", "right" and "one" cited in this specification are only for the convenience of narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in technical content, should also be regarded as the scope of implementation of the present invention.

[0024] As Figure 1 shown, a wellbore self-heat balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod is used to solve the problems that in the process of oil exploitation, the low-temperature oil layer solidifies and the fluidity decreases, it is not easy to heat the solidified oil layer, and when electric heating is used for heating, energy is wasted. The wellbore self-heat balance insulation system includes an oil pipe 8, an ultra-long gravity heat pipe type hollow sucker rod 9, a fluid passing valve 5, a working fluid storage tank 1, a working fluid pump 2, a working fluid valve 3, a movable hose 4, a beam pumping unit 7, a pump barrel 11, a pressure sensor 6 and a liquid level sensor 10.

[0025] The oil pipe 8 is arranged below the ground surface. The oil pipe 8 is used to connect the underground crude oil. Both the upper and lower ends of the oil pipe 8 are sealed. Part of the oil pipe 8 protrudes above the ground surface. An oil outlet is arranged at the top of the oil pipe 8 to discharge the melted crude oil from the oil outlet. The ultra-long gravity heat pipe type hollow sucker rod 9 is arranged inside the oil pipe 8. The top end of the ultra-long heat pipe type hollow sucker rod extends outside the oil pipe 8. The ultra-long gravity heat pipe type hollow sucker rod 9 can move up and down. A flexible seal is arranged at the through position between the top of the ultra-long gravity heat pipe type hollow sucker rod 9 and the oil pipe 8. The flexible seal can be a sealing ring to ensure the sealing performance at the through position between the ultra-long gravity heat pipe type hollow sucker rod 9 and the oil pipe 8. A liquid passing port is arranged at the top of the ultra-long gravity heat pipe type hollow sucker rod 9. The liquid passing port is used to pass liquid into or discharge liquid / air out. Among them, passing liquid into or discharging liquid out can be realized by pumping, while discharging air or pumping air out can be realized by a vacuum pump or a vacuum generator. The fluid passing valve 5 is installed at the liquid passing port of the ultra-long gravity heat pipe type hollow sucker rod 9 to control the connection between the inside of the ultra-long gravity heat pipe type hollow sucker rod 9 and the outside.

[0026] The working fluid storage tank 1 is installed on the ground surface. The working fluid storage tank 1 stores liquid working fluid. The working fluid storage tank 1 is provided with a liquid outlet. The working fluid pump 2 is arranged at the liquid outlet. The working fluid valve 3 is installed at the outlet of the working fluid pump 2. The two ends of the movable hose 4 are respectively connected to the fluid connection valve 5 and the working fluid valve 3. The movable hose 4 is used to connect the working fluid storage tank 1 and the ultra-long gravity heat pipe type hollow sucker rod 9. By opening the working fluid pump 2, the working fluid valve 3 and the fluid connection valve 5, the liquid working fluid in the working fluid storage tank 1 can be discharged into the ultra-long gravity heat pipe type hollow sucker rod 9, or the liquid working fluid inside can be discharged by reversely connecting the working fluid pump 2.

[0027] Among them, the liquid working fluid undergoes high-temperature phase change gasification at the bottom (evaporation section) of the ultra-long gravity heat pipe type hollow sucker rod 9 to form gaseous working fluid. Due to the pressure difference, the gaseous working fluid flows upward to the top (condensation section) of the ultra-long gravity heat pipe type hollow sucker rod 9 near the ground surface. The high-temperature gaseous working fluid releases heat due to the low-temperature environment and liquefies back into liquid working fluid and flows back to the bottom (evaporation section) of the ultra-long gravity heat pipe type hollow sucker rod 9 for circulation. Among them, the working fluid in the liquid working fluid and the gaseous working fluid includes distilled water, ammonia, carbon dioxide, and organic working fluid.

[0028] The beam pumping unit 7 is installed on the ground surface. The beam pumping unit 7 is provided with a lifting transmission device. The lifting transmission device can be the lifting realized by a lever mechanism, the lifting realized by a truss mechanism, the lifting realized by a gear and chain mechanism, or the lifting realized by a lead screw module, etc. The transmission end of the lifting transmission device is connected to the top end of the ultra-long gravity heat pipe type hollow sucker rod 9 through a strength rod, so as to drive the ultra-long gravity heat pipe type hollow sucker rod 9 to move up and down in the oil pipe 8 by using the lifting transmission device of the beam pumping unit 7.

[0029] The pump barrel 11 is installed at the bottom of the ultra-long heat pipe type hollow sucker rod. The outer peripheral surface of the pump barrel 11 approaches the inner peripheral surface of the oil pipe 8. When the ultra-long gravity heat pipe type hollow sucker rod 9 moves upward, the crude oil in the oil pipe 8 can be driven to flow upward by compressing the space, while improving the fluidity of the crude oil in the oil pipe 8 and facilitating the discharge of the crude oil in the oil pipe 8 from the oil outlet.

[0030] The pressure sensor 6 is installed at the top of the ultra-long gravity heat pipe type hollow sucker rod 9. The sensing end of the pressure sensor 6 is located inside the ultra-long gravity heat pipe type hollow sucker rod 9. The pressure sensor 6 can be a barometric pressure sensor or a vacuum test sensor. The pressure sensor 6 is used to detect the vacuum degree inside the pipe before the ultra-long gravity heat pipe type hollow sucker rod 9 works, and is also used to detect the pressure inside the pipe when the ultra-long gravity heat pipe type hollow sucker rod 9 works.

[0031] The liquid level sensor 10 is installed at the bottom inside the ultra-long gravity heat pipe type hollow sucker rod 9. The liquid level sensor 10 can be a distance test sensor or a displacement sensor. The liquid level sensor 10 is used to detect the liquid level height of the liquid working medium inside the ultra-long gravity heat pipe type hollow sucker rod 9 during operation.

[0032] The specific operation method of the wellbore self-thermal balance heat preservation system based on the ultra-long gravity heat pipe type hollow sucker rod 9 of the present invention includes the following steps:

[0033] 1) Pre-work before installing the sucker rod:

[0034] First, geological exploration is required to clarify the formation temperature gradient of the well extension and the oil reservoir temperature at the oil production site. At the same time, parameters such as the water content and wax content of the crude oil are measured to determine the required flow temperature of the crude oil at the outlet. Estimate the heat transfer required for the ultra-long gravity heat pipe type hollow sucker rod 9, and determine the downhole depth and the working medium flow rate inside the ultra-long gravity heat pipe type hollow sucker rod 9 through calculation or experiment to ensure that the system can meet the requirements during the oil production process and avoid additional costs caused by the excessive length of the ultra-long gravity heat pipe type hollow sucker rod 9.

[0035] 2) Pre-work before operation:

[0036] Use the fluid passing valve 5 to evacuate the inside of the ultra-long gravity heat pipe type hollow sucker rod 9 and discharge the non-condensable gas inside the ultra-long gravity heat pipe type hollow sucker rod 9. Install the movable connection hose, open the working medium pump 2 and the working medium valve 3, and then slowly open the liquid injection valve to inject the liquid working medium into the ultra-long gravity heat pipe type hollow sucker rod 9, start the self-thermal balance heat transfer process, observe the liquid level sensor 10, and when the liquid level sensor 10 reaches the target liquid level, close the working medium valve 3 and the fluid passing valve of the working medium storage tank 1, thus completing the system preparation work.

[0037] 3) Work during operation:

[0038] Start the lifting transmission device of the beam pumping unit 7. The ultra-long gravity heat pipe type hollow sucker rod 9 drives the pump barrel 11 to move up and down reciprocally, and pumps the bottom oil to the ground by compressing the space. During this process, the movable connection hose moves with the ultra-long gravity heat pipe type hollow sucker rod 9. As the oil production time increases, parameters such as the water content and wax content of the crude oil change, and the heating amount required for the low-temperature oil layer in the ultra-long gravity heat pipe type hollow sucker rod 9 will also change accordingly. Determine the heat transfer required for the ultra-long gravity heat pipe type hollow sucker rod 9 through experimental or calculation methods, and adjust the working performance of the ultra-long gravity heat pipe type hollow sucker rod 9 by adjusting the working medium flow rate inside the ultra-long gravity heat pipe type hollow sucker rod 9 to adapt to the change of the heat load of the oil pipe 8. This flexible adjustment mechanism ensures that the system can effectively adapt to the changing working conditions at different oil production stages, improving the stability of the system and the oil production efficiency.

[0039] 4) Working of the working fluid in the heat pipe:

[0040] The liquid working fluid is introduced into the ultra-long gravity heat pipe type hollow sucker rod 9 through the working fluid pump 2. The fluid at the bottom of the oil pipe 8 transfers heat to the bottom of the ultra-long gravity heat pipe type hollow sucker rod 9 at a high temperature. The liquid working fluid in the ultra-long gravity heat pipe type hollow sucker rod 9 undergoes phase change, absorbs heat and vaporizes to form a gaseous working fluid. The high-temperature gas moves upward driven by the pressure difference between the upper and lower parts inside the ultra-long gravity heat pipe type hollow sucker rod 9. When the high-temperature gas is close to the ground surface, it phase-changes back to a liquid working fluid in the ultra-long gravity heat pipe type hollow sucker rod 9 and releases heat. The released heat heats the crude oil in the oil pipe 8 close to the ground surface. The liquid working fluid flows back to the bottom of the ultra-long gravity heat pipe type hollow sucker rod 9 driven by gravity for circulation.

[0041] In summary, the present invention is provided with an oil pipe 8, an ultra-long gravity heat pipe type hollow sucker rod 9, a beam pumping unit 7, a pump barrel 11, a working fluid storage tank 1 and a working fluid pump 2. The oil pipe 8 is used to connect with the underground crude oil. The working fluid storage tank 1 transmits a certain amount of liquid working fluid into the ultra-long gravity heat pipe type hollow sucker rod 9 through the working fluid pump 2. The liquid working fluid at the bottom (evaporation section) of the ultra-long gravity heat pipe type hollow sucker rod 9 transfers heat through the high temperature of the underground crude oil. The liquid working fluid undergoes a phase change and vaporizes to form a gaseous working fluid in the evaporation section. Due to the pressure difference, the gaseous working fluid flows upward to the top (condensation section) of the ultra-long gravity heat pipe type hollow sucker rod 9. Since the top of the ultra-long gravity heat pipe type hollow sucker rod 9 is close to the ground surface and the temperature is relatively low, the gaseous working fluid releases heat to transfer heat to the low-temperature crude oil in the oil pipe 8 at this place. And the gaseous working fluid will liquefy back to a liquid working fluid and flow back to the bottom (evaporation section) of the ultra-long gravity heat pipe type hollow sucker rod 9 for circulation, so that the upper and lower ends of the ultra-long gravity heat pipe type hollow sucker rod 9 are in a state of stable heat balance, and the crude oil in the oil pipe 8 is in a state with better fluidity. At the same time, the lifting transmission device of the beam pumping unit 7 drives the ultra-long gravity heat pipe type hollow sucker rod 9 to move up and down to utilize the extrusion effect of the pump barrel 11, so as to discharge the crude oil in the oil pipe 8 to the oil outlet.

[0042] Compared with the prior art which uses electric heating to heat the crude oil during oil production, the present invention realizes energy consumption saving by adopting the method of introducing a liquid working fluid into the ultra-long gravity heat pipe type hollow sucker rod 9 and using the heat of the underground crude oil itself as a heat source to transfer heat to the entire ultra-long gravity heat pipe type hollow sucker rod 9, and has the advantages of stable and efficient heat transfer.

[0043] The embodiments of the present invention are not limited thereto. According to the above content of the present invention, using the common general technical knowledge and customary means in the art, without departing from the above basic technical idea of the present invention, the present invention can also be modified, substituted or combined in various other forms, all of which fall within the scope of the protection of the rights of the present invention.

Claims

1. A wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod, Characterized in that: It includes an oil pipe, an ultra-long gravity heat pipe type hollow sucker rod, a beam pumping unit, a pump barrel, a working fluid storage tank and a working fluid pump; The oil pipe is arranged below the ground surface, both the upper and lower ends of the oil pipe are sealed, a part of the oil pipe protrudes above the ground surface, and an oil outlet is arranged at the top of the oil pipe; The ultra-long gravity heat pipe type hollow sucker rod is arranged inside the oil pipe, the top end of the ultra-long heat pipe type hollow sucker rod extends outside the oil pipe, and a liquid passage port is arranged at the top of the ultra-long gravity heat pipe type hollow sucker rod; The beam pumping unit is arranged on the ground surface, the beam pumping unit is provided with a lifting transmission device, and the transmission end of the lifting transmission device is connected to the top end of the ultra-long gravity heat pipe type hollow sucker rod; The pump barrel is installed at the bottom of the ultra-long heat pipe type hollow sucker rod, and the outer peripheral surface of the pump barrel approaches the inner peripheral surface of the oil pipe; The working fluid storage tank is arranged on the ground surface, liquid working fluid is stored in the working fluid storage tank, the working fluid storage tank is provided with a liquid outlet, the working fluid pump is arranged at the liquid outlet, and the outlet of the working fluid pump is connected to the liquid passage port; The liquid working fluid is introduced into the ultra-long gravity heat pipe type hollow sucker rod through the working fluid pump, the fluid at the bottom of the oil pipe transfers heat to the bottom of the ultra-long gravity heat pipe type hollow sucker rod, the liquid working fluid in the ultra-long gravity heat pipe type hollow sucker rod is vaporized by phase change and absorbing heat to form gaseous working fluid, and the high-temperature gas moves upward driven by the pressure difference inside the ultra-long gravity heat pipe type hollow sucker rod from top to bottom. When the high-temperature gas is close to the ground surface, it is phase-changed back to liquid working fluid inside the ultra-long gravity heat pipe type hollow sucker rod and releases heat, and the released heat heats the crude oil in the oil pipe close to the ground surface, and the liquid working fluid flows back to the bottom of the ultra-long gravity heat pipe type hollow sucker rod by gravity for circulation.

2. The wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod as described in claim 1, Characterized in that: A fluid passage valve is arranged at the liquid passage port of the ultra-long gravity heat pipe type hollow sucker rod, and the fluid passage valve is used to discharge the non-condensable gas and the introduced liquid working fluid inside the ultra-long gravity heat pipe type hollow sucker rod, or to introduce the liquid working fluid.

3. The wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod as described in claim 2, Characterized in that: A working fluid valve is arranged at the outlet of the working fluid pump, and the working fluid valve is used to open and close the discharge of the liquid working fluid in the working fluid storage tank into the ultra-long gravity heat pipe type hollow sucker rod by the working fluid pump.

4. The wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod as described in claim 1, Characterized in that: It further includes a movable hose, both ends of the movable hose are respectively connected to the fluid passage valve and the working fluid valve, and the movable hose is used to connect the working fluid storage tank and the ultra-long gravity heat pipe type hollow sucker rod.

5. The wellbore self-thermal balance insulation system based on an ultra-long gravity heat pipe type hollow sucker rod as described in claim 1, Characterized in that: A pressure sensor is provided at the top of the ultra-long gravity heat pipe type hollow sucker rod. The sensing end of the pressure sensor is located inside the ultra-long gravity heat pipe type hollow sucker rod. The pressure sensor is used to detect the vacuum degree inside the pipe before the ultra-long gravity heat pipe type hollow sucker rod works, and is also used to detect the pressure inside the pipe when the ultra-long gravity heat pipe type hollow sucker rod works.

6. The wellbore self-thermal balance heat preservation system based on the ultra-long gravity heat pipe type hollow sucker rod according to claim 1, characterized in that: A liquid level sensor is provided at the bottom inside the ultra-long gravity heat pipe type hollow sucker rod. The liquid level sensor is used to detect the liquid level height of the liquid working medium inside the pipe when the ultra-long gravity heat pipe type hollow sucker rod works.

7. The wellbore self-thermal balance heat preservation system based on the ultra-long gravity heat pipe type hollow sucker rod according to claim 1, characterized in that: The working medium in the liquid working medium and the gaseous working medium includes distilled water, ammonia, carbon dioxide, and organic working medium.

8. The wellbore self-thermal balance heat preservation system based on the ultra-long gravity heat pipe type hollow sucker rod according to claim 1, characterized in that: A flexible seal is provided at the through position between the top of the ultra-long gravity heat pipe type hollow sucker rod and the oil pipe, so as to maintain the sealing performance of the through position between the ultra-long gravity heat pipe type hollow sucker rod and the oil pipe when the ultra-long gravity heat pipe type hollow sucker rod moves up and down.

9. The wellbore self-thermal balance heat preservation system based on the ultra-long gravity heat pipe type hollow sucker rod according to claim 1, characterized in that: The driving end of the lifting transmission device is connected to the top end of the ultra-long gravity heat pipe type hollow sucker rod through a strength rod, and the ultra-long gravity heat pipe type hollow sucker rod is driven to move up and down by the lifting transmission device through the strength rod.

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