An oil well heating device

Abstract

The utility model belongs to the heating device field for the wellhead heating, especially, relate to an oil well heating device. In order to propose a kind of mobile heating equipment that crude oil cannot wax in oil pipe, the utility model proposes an oil well heating device. Oil well heating device includes container, is equipped with heat storage container for containing heat conduction liquid and is used for the electric heating equipment for the heat conduction liquid heating on container, container is also connected with the liquid outlet pipeline for being communicated with double hollow rod liquid inlet and the liquid inlet pipeline for being communicated with double hollow rod liquid outlet, and liquid inlet pipeline and liquid outlet pipeline are all communicated with heat storage container, and liquid outlet pipeline is equipped with first circulating pump for driving heat conduction liquid along " heat storage container-liquid inlet pipeline-double hollow rod-liquid outlet pipeline-heat storage container " circulation when using.In actual use, crude oil in well can be directly heated by heat conduction liquid, ensure that the temperature of crude oil at wellhead is higher than set temperature, so as to avoid crude oil waxing.

Description

Technical Field

[0001] This utility model belongs to the field of heating devices for supplying heat to wellheads, and in particular relates to an oil well heating device. Background Technology

[0002] During the oil extraction process, in order to prevent the mixture of crude oil and water from forming wax in the pipeline due to the low temperature, it is necessary to heat the crude oil.

[0003] Existing equipment for heating crude oil can be divided into stationary heating equipment and mobile heating equipment.

[0004] Chinese utility model patent with authorization announcement number CN201531260U and authorization announcement date of July 21, 2010, discloses a closed-loop heating device for a double hollow sucker rod in a well. This heating device is a fixed heating device, which includes a double hollow rod with inner and outer channels and a ground heating system fixedly installed on the ground. One of the inner and outer channels has a water inlet and the other has a water outlet. The ground heating system includes a water storage tank and a heat exchanger that are interconnected. The water storage tank, the inner channel, the outer channel and the secondary side of the heat exchanger constitute a complete heating circuit. The primary side of the heat exchanger is used to introduce a liquid with a higher temperature to heat the water in the secondary side.

[0005] In the aforementioned heating devices, since the ground heating system is fixed on the ground, it can only be used locally. When the crude oil produced at the wellhead is depleted in the later stages, the ground heating system is difficult to move, resulting in a waste of resources.

[0006] To overcome the above problems, several mobile heating devices have been proposed in the existing technology, such as: (1) Chinese invention patent application CN117091301A, published on November 21, 2023, discloses an oilfield crude oil heating system based on solar thermal collector coupled with multiple energy sources. This system utilizes an associated gas environmentally friendly combustion module, a solar thermal collector module, and a multi-energy coupled heating module to heat a multi-energy coupled thermal storage device. The associated gas environmentally friendly combustion module is connected to the multi-energy coupled thermal storage device via a combustion module circulation pipe, allowing the high-temperature heat transfer oil flowing from the output of the module to enter the device. The multi-energy coupled thermal storage device is a shell-and-tube heat exchanger, with heat stored in ammonium aluminum sulfate dodecahydrate in the shell side. Furthermore, the associated gas environmentally friendly combustion module, solar thermal collector module, and multi-energy coupled heating module alone are insufficient to meet the heat requirements of the crude oil; an electric heating device must also be connected to the outlet of the multi-energy coupled thermal storage device.

[0007] (2) Chinese invention patent application with publication number CN115307310A and publication date of 2022.11.08 discloses a multi-energy coupled crude oil heating device. The crude oil heating device includes a hot water storage tank (equivalent to a heat storage container) installed on a container and an electric heating device. The electric heating device heats the soft water in the hot water storage tank. The electric heating device includes an air source heat pump and an electric heater. The electric heater is installed in the hot water storage tank. The solar panel and wind turbine convert the corresponding energy into electrical energy and store it in the battery. The battery supplies power to the air source heat pump and the electric heater. At the same time, during the off-peak electricity hours at night, the power grid is used to supply power to the air source heat pump. (3) Chinese invention patent application with publication number CN118376010A and publication date of July 23, 2024 discloses a skid-mounted device for photothermal coupling heating, which uses a solar thermal collector system and heating rods to heat water in a thermal storage tank.

[0008] All three types of mobile heating equipment mentioned above include a container, inside which is a heat exchanger. A heat medium flows into the primary side of the heat exchanger, while crude oil flows into the secondary side, thus heating the crude oil using the heat medium. However, when the outside temperature is low, the crude oil may form wax in the pipeline between the wellhead and the heat exchanger, causing blockage.

[0009] Meanwhile, among the three types of mobile heating equipment mentioned above, two of them do not effectively utilize associated gas from oil fields, and other equipment needs to be installed at the wellhead to treat the associated gas during oil extraction. In the other type, the associated gas environmentally friendly combustion module and the multi-energy coupled heat storage device are two devices connected by the circulation pipe of the combustion module. The heat generated by the combustion of associated gas first enters the first heat transfer oil, and then the first heat transfer oil exchanges heat with aluminum sulfate dodecahydrate to store the heat in aluminum sulfate dodecahydrate. After that, aluminum sulfate dodecahydrate releases heat to the second heat transfer oil, and the second heat transfer oil flows to the primary side of the heat exchanger and heats the crude oil. In this process, the heat generated by the combustion of associated gas from oil fields undergoes four heat exchanges before heating the crude oil. There is heat loss at each heat exchange, resulting in low heat utilization. Utility Model Content

[0010] The purpose of this utility model is to provide an oil well heating device to solve the technical problem that crude oil will form wax in the oil pipeline between the wellhead and the heat exchanger when using existing mobile heating equipment in cold weather.

[0011] To achieve the above objectives, the technical solution of the oil well heating device provided by this utility model is as follows: An oil well heating device includes a container, on which a heat storage container for containing a heat-conducting liquid and an electric heating device for heating the heat-conducting liquid are provided. The container is also connected to an outlet pipe for communicating with the inlet of a double hollow rod and an inlet pipe for communicating with the outlet of the double hollow rod. Both the inlet and outlet pipes are connected to the heat storage container, and the outlet pipe is equipped with a first circulation pump for driving the heat-conducting liquid to circulate along the cycle of "heat storage container - inlet pipe - double hollow rod - outlet pipe - heat storage container" during use.

[0012] Furthermore, the container is also equipped with a gas burner for igniting the gas in the associated gas of the oil field. The gas burner has an outlet and an inlet for connecting with the outlet of the oil-gas separator at the wellhead. The container is also equipped with a heating pipe located inside the heat storage container. One end of the heating pipe has an inlet that connects with the outlet of the gas burner, and the other end of the heating pipe extends to the upper surface of the container and has an outlet. The outer wall of the heating pipe is sealed to the heat storage container to isolate the heat transfer liquid from the space inside the heating pipe.

[0013] Furthermore, a chimney mounting base is provided at the air outlet for detachably installing the chimney, and the chimney mounting base is connected to the air outlet.

[0014] Furthermore, the heating pipe includes a main body portion that surrounds at least 3 / 4 of the circumference of the heat storage container, and the main body portion is located at the bottom of the heat storage container.

[0015] Furthermore, the container is also equipped with a pressure measuring device for detecting the gas pressure at the gas burner inlet, and a controller for controlling the gas burner to work when the pressure measured by the pressure measuring device reaches a first set value, and controlling the burner to stop working when the pressure measured by the pressure measuring device drops to a second set value.

[0016] Furthermore, the oil well heating device also includes a controller for controlling the electric heating device to heat the heat transfer fluid to a higher set temperature when the ambient temperature is low, and controlling the electric heating device to heat the heat transfer fluid to a lower set temperature when the ambient temperature is high.

[0017] Furthermore, the inlet of the liquid outlet pipe is connected to the bottom of the heat storage container, and the outlet of the liquid inlet pipe is connected to the top of the heat storage container.

[0018] Furthermore, the oil well heating device also includes a solar collector, which is connected to the heat storage container via a circulation pipe, and a second circulation pump is installed on the circulation pipe and mounted on the container.

[0019] Furthermore, the oil well heating device also includes a temperature measuring device for measuring the liquid temperature in the heat storage container and the liquid temperature in the solar collector. The container is also equipped with a controller for controlling the second circulation pump to start when the liquid temperature in the solar collector is at least 3°C ​​higher than the liquid temperature in the heat storage container, and for controlling the second circulation pump to shut down when the liquid temperature in the solar collector is no more than 1°C higher than the liquid temperature in the heat storage container.

[0020] Furthermore, the container is equipped with a controller to control the intermittent start of the second circulation pump when the ambient temperature is lower than the set temperature, in order to prevent the heat transfer liquid in the solar collector from freezing.

[0021] The beneficial effects of the oil well heating device provided by this utility model are as follows: This utility model is an improved invention. The heat-conducting liquid in the heat storage container can store heat, and the electric heating device can use electrical energy to heat the heat-conducting liquid. In use, the inlet and outlet pipes are connected to the double hollow rods. The first circulation pump can drive the heat-conducting liquid to circulate along the "heat storage container - inlet pipe - double hollow rods - outlet pipe - heat storage container", thereby directly heating the crude oil in the well using the heat-conducting liquid, ensuring that the temperature of the crude oil at the wellhead is higher than the set temperature to avoid waxing of the crude oil. Compared with the mobile heating equipment in the prior art, the oil well heating device in this utility model heats the crude oil directly in the well, thereby ensuring that the crude oil does not wax during transportation; compared with the fixed heating equipment in the prior art, both the heat storage container and the electric heating device in this utility model are mounted on a container, which is convenient for movement. Attached Figure Description

[0022] Figure 1 This is a front view of the container in a specific embodiment 1 of the oil well heating device of this utility model; Figure 2 This is a left view of the container in a specific embodiment 1 of the oil well heating device of this utility model; Figure 3 This is a top view of the container in a specific embodiment 1 of the oil well heating device of this utility model; Figure 4 This is a front perspective view of the electric heating device located inside the container in a specific embodiment 1 of the oil well heating device of this utility model; Figure 5 This is a top perspective view of the electric heating device located inside a container in a specific embodiment 1 of the oil well heating device of this utility model. Figure 6 This is a front perspective view of the heating pipe located inside the container in a specific embodiment 1 of the oil well heating device of this utility model; Figure 7 This is a top perspective view of the heating pipe located inside the container in a specific embodiment 1 of the oil well heating device of this utility model; Figure 8 This is a schematic diagram showing the location of the pipe for injecting water into the hot water storage tank in a specific embodiment 1 of the oil well heating device of this utility model; Figure 9 This is a schematic diagram showing the location of the pipe leading to the hot water storage tank in a specific embodiment 1 of the oil well heating device of this utility model; Figure 10 This is a schematic diagram of the structure of the oil well heating device of this utility model in use, according to a specific embodiment 1. Figure 11 This is a schematic diagram of the associated gas treatment section in a specific embodiment 1 of the oil well heating device of this utility model during use; Figure 12 This is a front perspective view of the associated gas treatment section during use in a specific embodiment 2 of the oil well heating device of this utility model; Figure 13 This is a top perspective view of the associated gas treatment section during use in a specific embodiment 2 of the oil well heating device of this utility model. Figure 14 This is a schematic diagram of the structure of the oil well heating device of this utility model in use, according to a specific embodiment 2.

[0023] Explanation of reference numerals in the attached figures: 1. Container; 2. Gas burner; 3. Chimney mounting base; 4. Transformer heat storage material box; 5. Electric heater; 6. Hot water storage tank; 7. Heating pipe; 7-1. Main body; 7-2. Vertical part; 8. Equipment room; 9. Liquid inlet pipe; 10. Solar liquid return pipe; 11. Power distribution room; 12. Filter device; 13. First circulation pump; 14. Second circulation pump; 15. Liquid outlet pipe; 16. Solar liquid supply pipe; 17. Solar collector; 18. Wellhead area; 19. Gas fine filter; 20. Gas separator; 21. Associated gas treatment room; 22. Pipe connection part. Detailed Implementation

[0024] To address the problems in the background art, the core inventive concept of this utility model is as follows: The present invention will be further described in detail below with reference to the embodiments.

[0025] Specific embodiment 1 of the oil well heating device provided by this utility model: In this embodiment, the heat-conducting liquid is soft water, which is well known in the art. However, in other embodiments, the heat-conducting liquid may also be a heat-conducting medium such as heat-conducting oil.

[0026] like Figure 1-11As shown, the oil well heating device includes a container 1. The container 1 is equipped with a heat storage container for containing heat-conducting liquid and an electric heating device for heating soft water. The container 1 is also connected to an outlet pipe 15 for communicating with the inlet of the double hollow rod and an inlet pipe 9 for communicating with the outlet of the double hollow rod. Both the inlet and outlet pipes are connected to the heat storage container, and the outlet pipe 15 is equipped with a first circulation pump 13 for driving the soft water to circulate along the "heat storage container-inlet pipe 9-double hollow rod-outlet pipe 15-heat storage container" when in use.

[0027] Heat storage containers can be water tanks, water containers, etc. Figure 1-11 In the container, the heat storage container is a hot water storage tank 6. To facilitate the connection of various pipelines, a pipe connection part 22 is provided on one side of the container 1, and all pipe joints are arranged at the pipe connection part 22; for example, Figure 1-11 As shown, the electric heating device only includes the electric heater 5 inserted into the hot water storage tank 6, but in other specific embodiments, refer to... Figure 1-11 As shown in the invention patent application with publication number CN115307310A, the electric heating device may also include only an air source heat pump, or the electric heating device may include both an air source heat pump and an electric heater 5; of course, the electric heating device may also be other devices that convert electrical energy into heat energy to heat soft water.

[0028] The soft water in hot water storage tank 6 can store heat, and the electric heating device can use electricity to heat the soft water. During use, such as... Figure 10 As shown, the inlet pipe 9 and outlet pipe 15 are connected to the double hollow rod. The first circulation pump 13 drives soft water to circulate along the path of "hot water storage tank 6 - inlet pipe 9 - double hollow rod - outlet pipe 15 - hot water storage tank 6", thereby directly heating the crude oil in the well with soft water to ensure that the temperature of the crude oil at the wellhead is higher than the set temperature to prevent wax formation. Compared with the mobile heating equipment in the prior art, the oil well heating device in this invention heats the crude oil directly in the well, thus ensuring that the crude oil does not form wax during transportation. Compared with the fixed heating equipment in the prior art, both the hot water storage tank 6 and the electric heating equipment in this invention are mounted on the container 1, making them easy to move.

[0029] like Figure 10 As shown, the oil well heating device includes three sets of inlet pipes 9 and outlet pipes 15. There can be three wells within the wellhead area 18, thus one oil well heating device can supply heat to all three wells. Of course, in different specific embodiments, one oil well heating device can also supply heat to one, two, four, or more wells. The more wells a single oil well heating device supplies heat, the more heat the hot water storage tank 6 needs to store. Figure 1-11As shown, the hot water storage tank 6 is also equipped with a transformer substation heat storage material box 4, which stores the transformer substation heat storage material, so as to store a large amount of heat. Compared with the technical solution without setting the transformer substation heat storage material box 4, setting the transformer substation heat storage material box 4 can effectively reduce the heat required to store soft water, reduce the volume of soft water and the volume of hot water storage tank 6, and is conducive to the miniaturization of container 1.

[0030] To save energy, as a specific implementation, the container 1 is also equipped with a gas burner 2 for igniting the gas in the associated gas of the oil field. The gas burner 2 has a gas outlet and an air inlet for communicating with the gas outlet of the oil-gas separator at the wellhead. The container 1 is also equipped with a heating pipe 7 located in the hot water storage tank 6. One end of the heating pipe 7 has an air inlet communicating with the gas outlet of the gas burner 2, and the other end of the heating pipe 7 extends to the upper surface of the container 1 and has an air outlet. The outer wall of the heating pipe 7 is sealed to the hot water storage tank 6 so that the soft water and the inner wall space of the heating pipe 7 are isolated from each other.

[0031] The gas burner 2 can ignite the gas in the associated gas from the oilfield, thus eliminating the need for additional associated gas treatment equipment at the wellhead. Simultaneously, it can utilize the gas in the associated gas to heat the soft water in the hot water storage tank 6. After the gas is ignited, the high-temperature gas produced by combustion enters the heating pipe 7. The high-temperature gas exchanges heat with the soft water in the hot water storage tank 6 through the pipe wall of the heating pipe 7. The soft water in the hot water storage tank 6 then flows into the double hollow rod and exchanges heat with the crude oil. This process involves fewer heat exchange cycles and results in high heat utilization.

[0032] However, in other specific implementations, refer to Figure 1-11 As shown, the gas burner 2 may not be installed on container 1. Instead, associated gas treatment equipment and gas transmission pipelines can be installed at the wellhead to transport the gas away from the wellhead. This part is existing technology and will not be described in detail here.

[0033] To facilitate the movement of container 1, as a specific implementation method, such as Figure 1-11 As shown, a chimney mounting base 3 for detachably installing the chimney is also provided at the air outlet. The chimney mounting base 3 is connected to the air outlet, and can be used to discharge high-temperature gas to a high place during use to avoid injury from high-temperature gas.

[0034] The chimney can be installed on the chimney mounting base 3 using existing conventional installation methods such as flange connection, bolt connection, snap-fit ​​connection, or pin connection, which will not be described in detail here. When it is necessary to move the container 1 to the vicinity of other wellheads, the chimney can be removed, and then the chimney and container 1 can be moved separately for easy relocation. However, in other specific embodiments, when the chimney is short, the chimney and heating pipe 7 can be integrally formed.

[0035] As one specific implementation method, such as Figure 6-7 As shown, the heating pipe 7 includes a vertical portion 7-2 and a main body portion 7-1 that surrounds the hot water storage tank 6 at least 3 / 4 of the way around it, with the main body portion 7-1 located at the bottom of the hot water storage tank 6.

[0036] On the one hand, the main body 7-1 surrounds the hot water storage tank 6 at least 3 / 4 of its circumference, which increases the contact area between the heating pipe 7 and the soft water, and improves the heat exchange area between the high-temperature gas and the soft water, thus facilitating better utilization of the heat in the high-temperature gas. On the other hand, the heating pipe 7 can heat the soft water from multiple points (at least 3 / 4 of its circumference), which helps to improve the uniformity of the soft water temperature in the hot water storage tank 6. Furthermore, soft water has the highest density at 4 ℃. Since the temperature of the soft water in the hot water storage tank 6 is much higher than 4 ℃, after the low-temperature soft water at the bottom of the hot water storage tank 6 is heated to high-temperature soft water by the high-temperature gas, the high-temperature soft water moves upward and mixes thoroughly with the soft water in the part of the hot water storage tank 6 except for the bottom, which helps to improve the uniformity of the soft water temperature in the hot water storage tank 6. At the same time, after the high-temperature soft water rises, the lower-temperature soft water fills the area vacated by the high-temperature soft water, thus keeping the soft water near the main body 7-1 at a lower temperature, increasing the temperature difference between the main body 7-1 and the soft water near the main body 7-1, and improving the utilization rate of the heat in the high-temperature gas. The higher the uniformity of the soft water temperature in the hot water storage tank 6, the more stable the temperature of the soft water flowing out of the hot water storage tank 6, and the lower the temperature of the soft water near the heating pipe 7.

[0037] However, in other specific implementations, refer to Figure 6-7 As shown, the vertical part 7-2 can also be set close to the gas burner 2, and the vertical part 7-2 and the gas burner 2 can be connected through the shortest connection part. The connection part and the vertical part 7-2 together form the heating pipe 7. In this case, the high temperature gas only heats the soft water in one side of the hot water storage tank 6. The temperature of the soft water near the heating pipe 7 is higher, the temperature difference between the heating pipe 7 and the nearby soft water is small, and the utilization rate of heat in the high temperature gas is low.

[0038] To reduce greenhouse gases and NO2 (which forms acid rain after being released into the air) produced by the combustion of fuel gas, as one specific implementation, a wellhead oil-gas separator is installed at the wellhead to separate crude oil from associated gas from the oilfield. A fine gas filter 19 and a gas separator 20 are connected in series between the wellhead oil-gas separator and the fuel gas burner 2, thereby reducing the greenhouse gases produced after the combustion of fuel gas in the fuel gas burner 2. However, in other specific implementations, the wellhead oil-gas separator can be directly connected to the fuel gas burner 2. In this case, the fuel gas burner 2 ignites the fuel gas from the associated gas from the oilfield, and the combustion of the fuel gas produces more greenhouse gases and NO2.

[0039] In order to improve the utilization rate of energy contained in gas, as a specific implementation method, the container 1 is also equipped with a pressure measuring device for detecting the gas pressure at the gas inlet of the gas burner 2. The container 1 is also equipped with a controller for controlling the gas burner 2 to work when the pressure measured by the pressure measuring device reaches a first set value, and controlling the burner to stop working when the pressure measured by the pressure measuring device drops to a second set value.

[0040] In practical use, the controller is located in the electrical distribution room 11, and the controller controls the gas burner 2 to work intermittently, so that the gas burns only at higher pressure, increasing the volume of high-temperature gas produced in a short period of time. Assuming that the volume of high-temperature gas produced by gas combustion remains constant within a certain period of time, compared with the technical solution of producing high-temperature gas at a constant rate, making the high-temperature gas only produced in a short period of time allows the heating pipe 7 to be heated to a higher temperature, thereby increasing the temperature difference between the heating pipe 7 and the soft water, improving the heat exchange efficiency between the heating pipe 7 and the soft water, and improving the utilization rate of the energy contained in the gas.

[0041] To improve the uniformity of soft water temperature within the hot water storage tank 6, as a specific implementation, the inlet of the outlet pipe 15 is connected to the bottom of the hot water storage tank 6, and the outlet of the inlet pipe 9 is connected to the top of the hot water storage tank 6. After exchanging heat with crude oil, the low-temperature soft water enters the top of the hot water storage tank 6. Under the influence of gravity, the low-temperature soft water moves downwards and fully exchanges heat with the high-temperature soft water inside the hot water storage tank 6, thereby improving the uniformity of soft water temperature within the hot water storage tank 6. Connecting the inlet of the outlet pipe 15 to the bottom of the hot water storage tank 6 prevents the low-temperature soft water from flowing out of the hot water storage tank 6 before it has been sufficiently heated.

[0042] However, in other specific embodiments, the inlet of the outlet pipe 15 can be connected to the top of the hot water storage tank 6, and the outlet of the inlet pipe 9 can be connected to the bottom of the hot water storage tank 6; or, the inlet of the outlet pipe 15 and the outlet of the inlet pipe 9 can be respectively set on both sides of the hot water storage tank 6.

[0043] To reduce carbon emissions from oil well heating devices, as one specific implementation, the oil well heating device also includes a solar collector 17. The solar collector 17 and the hot water storage tank 6 are connected by a circulation pipeline (including a solar supply pipeline 16 and a solar return pipeline 10), and a second circulation pump 14 is installed on the circulation pipeline. The first circulation pump 13 and the second circulation pump 14 are both located in the equipment room 8 on the container 1. The equipment room 8 also contains a filter device 12 located upstream of each circulation pump. By using solar energy through the solar collector 17 to heat the soft water in the hot water storage tank 6, the electricity consumption of the oil well heating device is reduced, thus reducing carbon emissions.

[0044] However, in other specific embodiments, the solar collector 17 may not be installed, and the soft water in the hot water storage tank 6 may be heated only by electric heating equipment and high-temperature gas generated by gas combustion.

[0045] To save energy, as a specific implementation, the oil well heating device also includes a temperature measuring device for measuring the water temperature in the hot water storage tank 6 and the water temperature in the solar collector 17. The container 1 is also equipped with a controller for controlling the second circulation pump 14 to start when the water temperature in the solar collector 17 is at least 3°C ​​higher than the water temperature in the hot water storage tank 6, and for controlling the second circulation pump 14 to shut down when the water temperature in the solar collector 17 is no more than 1°C higher than the water temperature in the hot water storage tank 6.

[0046] In actual use, the controller controls the second circulation pump 14 to work intermittently. Compared with the technical solution where the second circulation pump 14 works continuously, the second circulation pump 14 consumes less energy when it works intermittently, thus saving energy.

[0047] To prevent the soft water in the solar collector 17 from freezing, in one specific embodiment, the container 1 is also equipped with a controller for intermittently starting the second circulation pump 14 when the ambient temperature is lower than a set temperature, thus preventing the soft water in the solar collector 17 from freezing. This set temperature can be 0°C, 2°C, or other values ​​greater than 0°C, and the controller can control the second circulation pump 14 to run automatically for 2 minutes every 2 hours. Of course, in other specific embodiments, the second circulation pump 14 can also be allowed to operate continuously.

[0048] In practical use, electric heating equipment can operate at full power during off-peak hours (i.e., the evening off-peak electricity period), thereby reducing electricity costs and saving money.

[0049] Specifically, during off-peak hours, electric heating equipment is used to heat the hot water storage tank 6, ensuring sufficient heat storage. During peak hours, the electric heating equipment is shut off. By utilizing the heat storage tank 6, the operating time of the electric heating equipment during off-peak hours is reduced, thus lowering the load on the power grid. In extreme cases, if the maximum heat storage capacity of the hot water storage tank 6 is sufficiently large and there are other units providing heat to the tank, such as gas heating units or solar collectors, the heat provided by the electric heating equipment during off-peak hours, combined with the heat provided by other units, is sufficient to meet the total heat output of the tank 6 throughout the day, ensuring that the electric heating equipment remains off during both off-peak and peak hours. Of course, in other specific embodiments, when the maximum heat storage capacity of the hot water storage tank 6 is large enough and there are no other units that supply heat to the hot water storage tank 6, it can also be ensured that the electric heating equipment is in a closed state when the power grid is in a flat or peak period; or, when the heat provided by the electric heating equipment to the hot water storage tank 6 when the power grid is in a valley period does not meet the needs of the hot water storage tank 6, the electric heating equipment is used to supply heat to the hot water storage tank 6 when the power grid is in a flat period, so as to avoid the electric heating equipment being turned on when the power grid is in a peak period.

[0050] In order to save energy and avoid energy waste, as a specific implementation, the oil well heating device also includes a controller for controlling the electric heating device to heat the soft water to a higher set temperature when the ambient temperature is low, and controlling the electric heating device to heat the soft water to a lower set temperature when the ambient temperature is high.

[0051] Because ambient temperatures vary throughout the year, the total amount of heat required to power crude oil also varies. By controlling the maximum temperature of the soft water in the hot water storage tank 6, i.e., controlling the maximum heat stored in the hot water storage tank 6, energy waste can be avoided. Ambient temperature can be obtained through weather forecasts or through temperature sensors installed on container 1.

[0052] For example, in winter, the maximum temperature of the soft water can be set to 90°C as needed (this value can be set according to the daily heat output of the hot water storage tank 6). When the power grid is in a low-temperature period, the electric heating equipment will stop heating after reaching 90°C. Even if the power grid is still in a low-temperature period, the electric heating equipment will not heat the water again, thus avoiding energy waste. In summer, the maximum water temperature can be set to 80°C as needed (this value can be set according to the daily heat output of the hot water storage tank 6). When the power grid is in a low-temperature period, the electric heating equipment will stop heating after reaching 80°C. Even if the power grid is still in a low-temperature period, the electric heating equipment will not heat the water again, thus avoiding energy waste. Of course, in other specific embodiments, the water temperature can be heated to 90°C all year round, thus ensuring that the daily heat output of the hot water storage tank 6 can meet the needs of crude oil extraction.

[0053] In this embodiment, all controllers mentioned herein can be a single controller or multiple different controllers, all of which are located within the power distribution room 11. In this embodiment, the temperature measuring device and pressure measuring device can be corresponding sensors or transmitters, wherein the transmitter has higher measurement accuracy.

[0054] Specific embodiment 2 of the oil well heating device provided by this utility model: The purpose of this embodiment is to provide an oil well heating device with a gas fine filter 19 and a gas separator 20 located on a container 1.

[0055] The main difference between this embodiment and specific embodiment 1 is that: in specific embodiment 1, referring to... Figure 1-11 As shown, the gas fine filter 19 and the gas separator 20 are located on the ground at the wellhead, while in this embodiment, as... Figure 12-14 As shown, the gas fine filter 19 and the gas separator 20 are located in the associated gas treatment room 21 on the container 1.

[0056] When there is no fine gas filter 19 and gas separator 20 on the wellhead surface, the fine gas filter 19 and gas separator 20 can effectively reduce the greenhouse gases and NO2 produced after the combustion of gas in the gas burner 2. When there is already a fine gas filter 19 and gas separator 20 on the wellhead surface, the fine gas filter 19 and gas separator 20 on the container 1 can play a secondary filtration role. By installing the fine gas filter 19 and gas separator 20 in the associated gas treatment room 21, the gas in the gas burner 2 can be filtered at least once during use, avoiding the production of large amounts of greenhouse gases and NO2 after the gas combustion.

[0057] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oil well heating device, comprising a container, wherein the container is provided with a heat storage container for containing a heat-conducting fluid and an electric heating device for heating the heat-conducting fluid, characterized in that, The container is also connected to an outlet pipe for connecting to the inlet of the double hollow rod and an inlet pipe for connecting to the outlet of the double hollow rod. Both the inlet and outlet pipes are connected to the heat storage container, and the outlet pipe is equipped with a first circulation pump for driving the heat transfer liquid to circulate along the "heat storage container-inlet pipe-double hollow rod-outlet pipe-heat storage container" when in use.

2. The oil well heating device as described in claim 1, characterized in that, The container is also equipped with a gas burner for igniting the gas in the associated gas of the oil field. The gas burner has an outlet and an inlet for connecting with the outlet of the oil-gas separator at the wellhead. The container is also equipped with a heating pipe located inside the heat storage container. One end of the heating pipe has an inlet that connects with the outlet of the gas burner, and the other end of the heating pipe extends to the upper surface of the container and has an outlet. The outer wall of the heating pipe is sealed to the heat storage container to isolate the heat transfer liquid from the space inside the heating pipe.

3. The oil well heating device as described in claim 2, characterized in that, The outlet is also equipped with a chimney mounting base for detachable installation of the chimney, and the chimney mounting base is connected to the outlet.

4. The oil well heating device as described in claim 2 or 3, characterized in that, The heating pipe includes a main body portion that wraps around the circumference of the heat storage container at least 3 / 4 of the way, and the main body portion is located at the bottom of the heat storage container.

5. The oil well heating device according to any one of claims 1-3, characterized in that, The container is also equipped with a pressure measuring device for detecting the gas pressure at the gas burner inlet, and a controller for controlling the gas burner to work when the pressure measured by the pressure measuring device reaches a first set value, and controlling the burner to stop working when the pressure measured by the pressure measuring device drops to a second set value.

6. The oil well heating device according to any one of claims 1-3, characterized in that, The oil well heating device also includes a controller for controlling the electric heating device to heat the heat transfer fluid to a higher set temperature when the ambient temperature is low, and for controlling the electric heating device to heat the heat transfer fluid to a lower set temperature when the ambient temperature is high.

7. The oil well heating device according to any one of claims 1-3, characterized in that, The inlet of the liquid outlet pipe is connected to the bottom of the heat storage container, and the outlet of the liquid inlet pipe is connected to the top of the heat storage container.

8. The oil well heating device according to any one of claims 1-3, characterized in that, The oil well heating device also includes a solar collector, which is connected to the heat storage container via a circulation pipe, and a second circulation pump is installed on the circulation pipe and mounted on the container.

9. The oil well heating device as described in claim 8, characterized in that, The oil well heating device also includes a temperature measuring device for measuring the liquid temperature in the heat storage container and the liquid temperature in the solar collector. The container is also equipped with a controller for controlling the second circulation pump to start when the liquid temperature in the solar collector is at least 3°C ​​higher than the liquid temperature in the heat storage container, and for controlling the second circulation pump to shut down when the liquid temperature in the solar collector is no more than 1°C higher than the liquid temperature in the heat storage container.

10. The oil well heating device as described in claim 8, characterized in that, The container is also equipped with a controller to control the intermittent start of the second circulation pump when the ambient temperature is lower than the set temperature, in order to prevent the heat transfer liquid in the solar collector from freezing.

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