An electromagnetic heating device for an oil-gas mixture

Abstract

This invention relates to an electromagnetic heating device for oil-gas mixtures. The device comprises a heating body mainly composed of an upper heating tube and a lower heating tube. The upper heating tube is connected to a gas bladder in a gas buffer tank via a gas collecting pipe. An external pressure sensor and an internal pressure sensor are fixed inside the gas buffer tank. A gas-liquid mixing pump and an automatic exhaust valve are installed in the gas delivery pipeline. One end of the gas delivery pipeline is fixed inside the gas bladder in the gas buffer tank, and the other end is connected to the liquid outlet pipeline downstream of a one-way valve. The automatic exhaust valve, the gas-liquid mixing pump, and the heating coil are all electrically connected to a heating controller and connected via data cables. Temperature sensors in the delivery pipeline, external pressure sensors in the gas bladder, internal pressure sensors in the gas bladder, and internal pressure sensors in the pipeline are all connected to the heating controller via data cables. This device effectively solves the problems existing in the current heating process of gas-rich oil-gas mixtures, ensuring effective heating of the oil-gas mixture while preventing localized cavitation and coking.

Description

Technical Field

[0001] This invention relates to a heating device for oil well produced fluids in the petroleum industry, and in particular to an electromagnetic heating device for an oil-gas mixture. Background Technology

[0002] In the process of single-well oil production in an oilfield, the extracted oil-gas mixture, containing crude oil, water, natural gas, carbon dioxide, and other components, is generally transported to a combined pumping station via pipeline. At the station, it undergoes dehydration and degassing treatment before being transported externally. Because the oil-gas mixture extracted from the wellhead is at a low temperature and the transportation distance is long, phenomena such as low-temperature viscosity, solidification, and wax formation can easily occur in the pipeline during transportation, generating significant resistance and resulting in excessively high back pressure at the wellhead, affecting the normal operation of the pumping unit. Therefore, it is necessary to use heating technology to raise the temperature of the extracted oil-gas mixture to above 50°C. This heating reduces viscosity and lowers the back pressure during transportation, allowing for normal delivery to the combined pumping station.

[0003] Due to increasingly stringent environmental regulations, the heating methods for produced oil and gas mixtures have shifted from the earlier associated gas water-jacketed furnace heating to technologies such as electric heating, solar heating, or energy storage heating. Electric heating is being promoted in many regions, with various electric heating devices undergoing trials, demonstrations, and applications. Currently, resistance and electromagnetic electric heating technologies are primarily designed for liquid heating; their heating effect is relatively poor when the produced oil and gas mixture contains gas. When the produced fluid contains a significant amount of gas, even after electric heating, the back pressure during transport remains high, failing to guarantee the back pressure requirements for normal transport.

[0004] Because a gas has a lower heat absorption capacity than a liquid of the same volume, the temperature of the heating element can rise. When a large amount of gas fills the heating element, it cannot be effectively heated, and the gas cannot be effectively and separately discharged into the delivery pipeline. This causes the delivery pipeline to cool down, the back pressure to rise, and exceed the specified pressure. Simultaneously, the large amount of gas in the heating element creates an unbalanced temperature field. Some gas-filled areas cannot absorb heat from the heating element, resulting in locally excessively high temperatures while the liquid areas remain relatively cool. This leads to localized coking or severe localized high-temperature corrosion, affecting the service life of the heating equipment. The coked material can also detach and clog the crude oil delivery pipeline.

[0005] When gas is present in the heated oil-gas mixture, the impact on the existing heating device is as follows: 1. When gas is present in the heating device, the heating efficiency is low, the heat of the heating element cannot be transferred to the oil-gas mixture, the heating capacity is greatly reduced, the temperature does not reach the design parameters, resulting in high back pressure in the delivery pipeline, which affects the normal production of the oil well.

[0006] 2. When gas is present in the heating device, cavitation and coking are likely to occur. When the oil-gas mixture flows in the heating element, the gas is generally in the upper layer and the liquid is in the lower layer. Since the heating element is heated by all of its components, the upper parts of the heating element are not cooled by liquid, resulting in localized high temperatures. The fluctuation of gas impacts the high-temperature area of ​​the heating element, causing cavitation. Some of the crude oil liquid splashed into the upper high-temperature area forms coke lumps due to the high localized temperature, gradually clogging the heating element. After the lumpy coke flows out, it is more likely to clog the small bends and valve components of the delivery pipeline.

[0007] 3. The presence of gas within the heating device shortens the lifespan of the heating element. The presence of gas in the heated oil-gas mixture can lead to uneven temperatures across the heating zones, resulting in significant temperature differences. This is especially true when using magnetic heating elements, which are prone to magnetic degradation, reducing their lifespan. Furthermore, uneven heating, occurring under pressure, can cause deformation in high-heat areas, further impacting their lifespan.

[0008] 4. When gas is present in the heating device, overheating and energy waste are likely to occur. Due to the influence of gas in the oil-gas mixture, in order to increase the temperature and achieve a certain heating capacity, the overall temperature of the heating element must be increased. This uneven heating results in heat loss and energy waste.

[0009] Existing oil-gas mixture heating devices urgently need improvement. Summary of the Invention

[0010] The purpose of this invention is to provide an electromagnetic heating device for oil-gas mixtures, addressing the shortcomings of current heating devices for oil-gas mixtures containing gas, such as low heating efficiency, cavitation and coking, failure to reach design temperatures, overheating, energy waste, and high back pressure in pipelines, which affect normal oil well production. This invention improves the heating efficiency of oil-gas mixtures, eliminates cavitation and coking in the heating device, avoids overheating, saves energy, and reduces production costs.

[0011] The technical solution of this invention is as follows: An electromagnetic heating device for an oil-gas mixture includes a heating body, which mainly consists of an upper heating pipe and a lower heating pipe. Heating coils are provided on the outer walls of both the upper and lower heating pipes and they are connected via a mixing bend. An internal pressure sensor is installed in the mixing bend. The upper heating pipe is connected to an outlet pipeline, which is equipped with a one-way valve. The lower heating pipe is connected to an inlet pipeline. The oil-gas mixture enters through the inlet pipeline and exits through the outlet pipeline. Temperature sensors are installed in both the inlet and outlet pipelines. The upper heating pipe is connected to a gas bladder in a gas buffer tank via a gas collecting pipe. An external pressure sensor and an internal pressure sensor are fixed inside the gas bladder. A gas-liquid mixing pump and an automatic exhaust valve are installed in the gas delivery pipeline. One end of the gas delivery pipeline is fixed inside the gas bladder in the gas buffer tank, and the other end is connected to the outlet pipeline downstream of the one-way valve. The automatic exhaust valve, the gas-liquid mixing pump, and the heating coils are all electrically connected to a heating controller and connected via a data cable.

[0012] The delivery pipeline temperature sensor, airbag external pressure sensor, airbag internal pressure sensor, and pipe internal pressure sensor are all connected to the heating controller via data cables.

[0013] Preferably, the upper heating tube and the lower heating tube are further provided with a copper skid conductive layer, which is an 8mm-10mm copper cylinder and is interference-fitted with the inner cavity of the upper heating tube and the lower heating tube.

[0014] Preferably, a gas-liquid turbulence tube is also provided in the middle section of the upper heating tube and the lower heating tube. The gas-liquid turbulence tube is a tube with an inner diameter that is 80mm-90mm smaller than the inner diameter of the upper heating tube and the lower heating tube.

[0015] Preferably, the airbag is an inflatable bag-shaped body made of rubber, with its bottom fixed to the bottom of the gas buffer tank. The height of the airbag before inflation is two-thirds of the height of the gas buffer tank's inner cavity. The external pressure sensor of the airbag is fixed in the inner wall of the gas buffer tank at three-quarters of its height.

[0016] Preferably, there are two gas collecting pipes, one end of which is connected to the upper heating pipes on both sides of the gas-liquid turbulence pipe, and the other end is connected to the bottom of the gas bladder in the gas buffer tank; both gas collecting pipes are equipped with gas storage pipes, the diameter of which is larger than that of the gas collecting pipes and is located close to the gas buffer tank 4.

[0017] Preferably, the power of the heating coil in the lower heating tube is higher than the power of the heating coil in the upper heating tube.

[0018] Preferably, the outer walls of the upper and lower heating tubes in the heating body are provided with an insulation layer, a mica plate, a heating coil, an insulation layer, and an electromagnetic shielding layer composed of nickel-plated carbon fiber in sequence from the inside to the outside; the outer wall of the mixing bend is provided with an insulation layer.

[0019] Preferably, an anti-corrosion layer is applied to the inner wall of the copper skid conductive layer in the upper and lower heating tubes, and the anti-corrosion layer is sprayed with boron nitride paint; chrome plating is applied to the inner wall of the liquid inlet line, liquid outlet line, gas-liquid turbulence pipe and mixing bend.

[0020] Preferably, the insulation layer in the heating element is a ceramic fiber cotton layer with a thickness between 18mm and 22mm, and the insulation layer is disposed on both sides of the mica plate and the heating coil.

[0021] Preferably, the automatic exhaust valve is a solenoid valve; both ends of the upper and lower heating tubes are equipped with antimagnetic plates, which are steel plates with an external copper conductive paint layer; the upper heating tube is also equipped with an internal temperature sensor communicating with its inner cavity and an external temperature sensor installed on the external insulation layer of the heating coil; both the internal and external temperature sensors are connected to the heating controller via data cables.

[0022] Compared with existing electromagnetic heating devices, the significant advantages of this invention are: this device can effectively solve the problems existing in the current heating process of gas-rich oil-gas mixtures, ensuring effective heating of the oil-gas mixture while preventing local cavitation and coking of the device.

[0023] This invention employs an automatic gas-liquid separation operation mode. An automatic vent valve automatically discharges gas from the oil-gas mixture, closing automatically when no gas is present. The gas-liquid mixing pump operates automatically based on the pressure detected by an external pressure sensor within the gas buffer tank. When the gas content in the heated and transported oil-gas mixture is low, the inflation and deflation frequency of the gas buffer tank's gas bladder decreases, resulting in a lower pump operating frequency. Conversely, when the gas content in the heated and transported oil-gas mixture is high, the inflation and deflation frequency of the gas buffer tank's gas bladder increases, leading to a higher pump operating frequency. In this invention, the gas in the oil-gas mixture is separated by the gas buffer tank and then bypasses the heating element for continued transport. The entire process remains a completely closed system, eliminating gas spillage and meeting environmental protection requirements.

[0024] Because the gas in the oil-gas mixture entering the lower heating pipe naturally accumulates in the upper heating pipe, the lower heating pipe only heats the liquid. The gas entering the upper heating pipe is separated by a gas buffer tank and then bypasses the heating element before being transported. This ensures effective heating of the oil-gas mixture while preventing localized cavitation and coking in the heating element, avoiding overheating and energy waste. It improves the heating efficiency of the oil-gas mixture while maintaining normal pipeline pressure, ensuring normal well production, and demonstrating significant effectiveness.

[0025] The application of this device overcomes the problem that previous heating devices could not adapt to heating oil-gas mixtures. Especially when the proportion of gas in the oil-gas mixture produced from oil wells is high, the original heating devices would start and stop intermittently, unable to operate continuously and stably. However, this device can operate continuously and stably, and the heating power remains stable without any sudden changes.

[0026] The following is a comparison of the actual application test results of the device of the present invention on a factory test bench.

[0027] 1. Using a gas-liquid mixture to simulate an oil-gas mixture, a comparative test was conducted between the existing heating device and the device of this invention:

[0028] When using the existing heating device, heat cannot be transferred when there is a lot of gas inside the heating element, causing the current to drop rapidly during heating; conversely, when there is a lot of liquid inside the heating element, the heating current increases rapidly. These two situations alternate and repeat repeatedly.

[0029] When heating using this invention, it is largely unaffected by the gas in the gas-liquid mixture. After the gas-liquid mixture enters the heating body, its flow slows down, and the gas is automatically separated into the upper heating tube. In the upper heating tube, the gas enters the gas buffer tank through the gas collecting pipe. When the pressure in the gas buffer tank reaches the set upper limit, the automatic exhaust valve opens, the gas-liquid mixing pump starts, and the gas in the gas bag is discharged until the pressure in the gas buffer tank is lower than the set lower limit. Then the automatic exhaust valve closes, and the gas-liquid mixing pump stops working.

[0030] 2. Using gas-liquid mixtures with various gas ratios to simulate oil-gas mixtures, a comparative test was conducted on the original heating device and the device of the present invention: ① When the liquid inlet pipeline 10-1 is under a delivery pressure of 1MPa and the gas-liquid volume ratio is 0.1:1: both the original heating device and the present invention can operate normally.

[0031] ② When the liquid inlet pipeline 10-1 is under a delivery pressure of 1MPa and the gas-liquid volume ratio is 0.2:1: the original heating device can operate, but there are fluctuations, the heating current is unstable, and the alternating changes of rapid current decrease and rapid current increase occur frequently.

[0032] In the device of this invention, the gas quickly and automatically overflows into the gas buffer tank's bladder, and the heating element operates continuously and stably.

[0033] ③ When the liquid inlet pipeline 10-1 is under a delivery pressure of 1MPa and the gas-liquid volume ratio is 0.5:1: the operation of the original heating device is quite unstable. In addition to current fluctuations and repeated start-stops, there are occasional alarms such as high temperature of the heating element and demagnetization of the ferromagnetic element.

[0034] In this invention, the gas in the device is rapidly and automatically overflows into the gas buffer tank's bladder, the heating element operates continuously and stably, completely unaffected by the gas, and the gas-liquid mixing pump starts at a low frequency and operates stably.

[0035] ④ When the liquid inlet pipeline 10-1 is under a delivery pressure of 1MPa and the gas-liquid volume ratio is 1:1: the operation of the original heating device is very unstable, and there are continuous alarms such as high temperature of the heating element and demagnetization of the ferromagnetic element. The upper heating tube of the heating element is basically in a stopped heating state, and the lower heating tube fluctuates.

[0036] In this invention, the gas continuously and automatically overflows into the gas buffer tank's bladder, while the heating element remains stable and largely unaffected; the gas-liquid mixing pump starts at a slightly higher frequency, but the entire heating device still operates relatively stably.

[0037] ⑤ When the liquid inlet pipeline 10-1 is under a delivery pressure of 1MPa and the gas-liquid volume ratio is 3:1: the original heating device is always in a high temperature and low magnetic protection state and cannot operate.

[0038] In this invention's device, the lower heating element operates continuously and stably, while the upper heating element experiences current fluctuations and occasional high-temperature alarms, but no low-magnetic alarms occur. The separated gas continuously overflows into the gas buffer tank's bladder, causing the gas-liquid mixing pump to start frequently, and the entire heating device reaches its operational limit. At this point, the gas buffer tank's capacity is slightly insufficient; to maintain stable operation, the gas buffer tank's volume and the gas-liquid mixing pump's displacement and pressure need to be increased.

[0039] The above key test parameters show that this device can effectively solve the problems that occur during the heating of gas-liquid mixtures. The adaptability of this heating device is about 10 times higher than that of the original mixture, which greatly expands the application range of the heating device and better adapts to the situation where the heated substance contains a large amount of gas, making the heating device more reliable, efficient and stable when heating gas-liquid mixtures.

[0040] In addition to the experiments conducted on the factory test bench, the device was also tested and applied at the well site for 3 months. The gas ratio in the oil-gas mixture produced by the experimental well was too high. The original heating device was not continuous and unstable. The heating current alternated between 20A and 40A. Occasionally, high temperature and low magnetic protection occurred. The wellhead periodically experienced high back pressure, which affected the normal production of the oil well.

[0041] After using the device of this invention, it can operate continuously and stably, with the current always maintained at around 25A. The automatic overflow and exhaust operation of the gas buffer tank and automatic exhaust valve are reliable. All the automatically separated gas is remixed and returned to the liquid outlet pipeline, i.e., the delivery pipeline, without causing gas leakage or pollution, and no high back pressure phenomenon occurs at the wellhead.

[0042] Field tests have proven that this device operates stably and ensures normal oil well production. The stable heating current improves heating efficiency. Compared with other similar oil wells with comparable production but without associated gas, the power consumption is comparable under the same temperature rise conditions. Attached Figure Description

[0043] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0044] Figure 1 This is a schematic diagram of the structure and working principle of the device of the present invention.

[0045] Figure 2 for Figure 1 A cross-sectional view of the structural schematic diagram of the heating element.

[0046] Figure 3 for Figure 2 A schematic diagram of the left-side view structure. Detailed Implementation

[0047] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this invention. The technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] See Figure 1 - Figure 3 An electromagnetic heating device for an oil-gas mixture includes a heating element 10, which mainly consists of an upper heating pipe 10-14 and a lower heating pipe 10-15. Heating coils 10-6 are provided on the outer walls of both the upper heating pipe 10-14 and the lower heating pipe 10-15, and they are connected by a mixing bend 10-10. The mixing bend 10-10 is supported by a supporting angle steel 10-11. A pressure sensor 10-13 is installed inside the mixing bend 10-10. The upper heating pipe 10-14 is connected to an outlet pipeline 10-1, and a one-way valve 8 is installed in the outlet pipeline 10-1. The lower heating pipe 10-15 is connected to an inlet pipeline 10-3. The oil-gas mixture enters through the inlet pipeline 10-3 and exits through the outlet pipeline 10-1. The inlet pipeline 10-3 and the outlet pipeline 10-1... Each component is equipped with a delivery pipeline temperature sensor 10-2. The upper heating pipe 10-14 is connected to the air bladder in the gas buffer tank 4 via a gas collecting pipe 3. An external pressure sensor 5 and an internal pressure sensor 6 are fixed inside the gas buffer tank 4. The gas delivery pipeline 11 is equipped with a gas-liquid mixing pump 2 and an automatic exhaust valve 1. One end of the gas delivery pipeline 11 is fixed inside the air bladder in the gas buffer tank 4, and the other end is connected to the liquid outlet pipeline 10-1 behind the one-way valve 8. The automatic exhaust valve 1, the gas-liquid mixing pump 2, and the heating coil 10-6 are all electrically connected to the heating controller 7 and connected via a data cable. The delivery pipeline temperature sensor 10-2, the external pressure sensor 5, the internal pressure sensor 6, and the internal pressure sensor 10-13 are all connected to the heating controller 7 via data cables.

[0051] The present invention employs a gas-liquid separation and transportation method to solve various problems encountered in the existing technology when heating gas-rich oil-gas mixtures, such as: low heating efficiency when gas is present in the heating device, inability of heat in the heating body 10 to be effectively transferred to the oil-gas mixture, failure to reach the design parameters for heating temperature, high back pressure in the transportation pipeline, affecting the normal production of the oil well, and easy occurrence of cavitation and coking when gas is present in the heating device.

[0052] like Figure 1As shown, after the oil-gas mixture enters the lower heating pipe 10-15 of the heating body 10 from the lower liquid inlet pipe 10-3, the flow rate decreases rapidly as the diameter of the oil-gas mixture conveying pipe expands rapidly. Automatic gas-liquid separation is achieved by gravity. The separated gas flows into the upper heating pipe 10-14 and enters the gas buffer tank 4 through the gas collecting pipe 3.

[0053] The gas buffer tank 4 in this device collects the gas that naturally accumulates in the upper heating pipes 10-14 from the oil-gas mixture entering the heating body 10, and then collects it into the gas bladder inside the gas buffer tank 4 through the gas collecting pipe 3. The gas collected in the upper heating pipes 10-14 overflows into the gas buffer tank 4 through the gas collecting pipe 3, making the internal and external pressures of the heating body 10 roughly equal. In this way, the lower heating pipes 10-15 are generally liquid, and the heating process is basically unaffected by the gas. The gas entering the upper heating pipes 10-14 stays briefly before entering the gas bladder in the gas buffer tank 4.

[0054] When the external pressure of the gas buffer tank 4 is low, the gas buffer tank 4 is in the process of collecting and filling gas. At this time, the gas-liquid mixing pump 2 is not running, and the automatic exhaust valve 1 is in the shut-off state. The present invention connects the output end of the exhaust pipeline 11 to the liquid outlet pipeline 10-1 after the one-way valve 8, which can effectively prevent the backflow of gas. When the device is in the exhaust process, it can prevent gas from flowing back into the heating element 10.

[0055] When a certain amount of gas is stored in the gas bladder inside the gas buffer tank 4, the bladder expands and compresses the air inside the gas buffer tank 4. This compression is detected by the external pressure sensor 5, which then activates the oil-gas mixing pump 2 via the heating controller 7. The gas in the gas buffer tank 4 is then directly output through the liquid outlet line 10-1 downstream of the one-way valve 8. When the external pressure of the gas bladder inside the gas buffer tank 4 is low, the automatic exhaust valve 1 closes, and the gas-liquid mixing pump 2 stops working. In this way, the gas in the oil-gas mixture is separated in the heating element 10, which only heats the liquid in the oil-gas mixture. The heated oil and gas are then remixed and transported. This solves various problems encountered when heating gas-rich oil-gas mixtures and also prevents gas from being discharged, meeting environmental protection requirements.

[0056] Based on the above embodiment one, the present invention also has the following embodiments:

[0057] In a preferred embodiment, the upper heating tube 10-14 and the lower heating tube 10-15 are further provided with a copper skid conductive layer 10-4. The copper skid conductive layer 10-4 is an 8mm-10mm thick copper cylinder that is interference-fitted with the inner cavity of the upper heating tube 10-14 and the lower heating tube 10-15. By adding a copper skid conductive layer 10-4 of a certain thickness within the heating body 10 through an interference fit, the heat transfer efficiency between the heating body 10 and the liquid is improved. On the one hand, this increases the heat exchange area and reduces the size of the equipment; on the other hand, copper has a high conductivity coefficient, resulting in uniform heat distribution and reducing the likelihood of localized overheating. Even if the gas in the oil-gas mixture entering the heating body 10 is not completely separated and discharged, and a small amount of gas remains mixed in, the improved conduction efficiency can reduce the occurrence of localized overheating.

[0058] In a preferred embodiment, a gas-liquid turbulence pipe 10-7 is further provided in the middle section of the upper heating pipe 10-14 and the lower heating pipe 10-15. The gas-liquid turbulence pipe 10-7 has an inner diameter that is 80mm-90mm smaller than the inner diameter of the upper heating pipe 10-14 and the lower heating pipe 10-15. After the gas-liquid turbulence pipe 10-7 is provided, the oil-gas mixture entering the heating body 10 can be further disturbed, causing the oil-gas mixture to settle and separate further. The gas-liquid turbulence pipe 10-7 plays an auxiliary role in the settling and separation of the oil-gas mixture entering the heating body 10.

[0059] In a preferred embodiment, the airbag is an inflatable bag-shaped body made of rubber, with the bottom of the airbag fixed to the bottom of the gas buffer tank 4. The height of the airbag before inflation is two-thirds of the height of the inner cavity of the gas buffer tank 4. The external pressure sensor 5 of the airbag is fixed in the inner wall of the gas buffer tank 4 at three-quarters of its height.

[0060] In a preferred embodiment, two gas collecting pipes 3 are provided. One end of each gas collecting pipe 3 is connected to the upper heating pipes 10-14 on both sides of the gas-liquid turbulence pipe 10-7, and the other end is connected to the bottom of the gas bladder in the gas buffer tank 4. Each of the two gas collecting pipes 3 is provided with a gas storage pipe 12. The diameter of the gas storage pipe 12 is larger than the diameter of the gas collecting pipe 3 and is located close to the gas buffer tank 4. The gas storage pipe 12 facilitates the smooth entry of gas into the gas bladder in the gas buffer tank 4.

[0061] In a preferred embodiment, the power of the heating coil 10-6 in the lower heating tube 10-15 is higher than the power of the heating coil 10-6 in the upper heating tube 10-14. This facilitates more even heating of the liquid in the oil-gas mixture and improves heating efficiency.

[0062] In a preferred embodiment, the outer walls of the upper heating tube 10-14 and the lower heating tube 10-15 of the heating element 10 are sequentially provided from the inside out with an insulation layer, a mica plate, a heating coil 10-6, an insulation layer, and an electromagnetic shielding layer 10-8 composed of nickel-plated carbon fiber; the outer wall of the mixing bend 10-10 is provided with an insulation layer. The electromagnetic shielding layer 10-8 composed of nickel-plated carbon fiber can reduce electromagnetic radiation and interference to the external environment.

[0063] In a preferred embodiment, an anti-corrosion layer 9 is applied to the inner wall of the copper skid conductive layer 10-4 in the upper heating pipe 10-14 and the lower heating pipe 10-15. This anti-corrosion layer 9 is formed by spraying boron nitride paint, possessing high-temperature and corrosion-resistant properties. Furthermore, the invention employs chrome plating for corrosion protection on the inner walls of the inlet pipe 10-3, outlet pipe 10-1, gas-liquid turbulence pipe 10-7, and mixing bend pipe 10-10, enabling the overall temperature resistance of the device to reach 800℃. The anti-corrosion layer 9 provides excellent protection against various acidic substances and other components contained in crude oil. Additionally, when a gas-liquid mixture exists in the heating element 10 and localized high temperatures are generated, the presence of the anti-corrosion layer 9 prevents direct contact between the copper skid conductive layer 10-4 and the oil-gas mixture. This solves both the crude oil corrosion problem and the high-temperature corrosion problem of the device, thereby extending its service life.

[0064] In a preferred embodiment, the insulation layer in the heating element 10 is a ceramic fiber cotton layer with a thickness between 18mm and 22mm. The insulation layer is disposed on both sides of the mica plate and the heating coil 10-6.

[0065] In a preferred embodiment, the automatic exhaust valve 1 is a solenoid valve; both ends of the upper heating tube 10-14 and the lower heating tube 10-15 are equipped with antimagnetic plates 10-12, which are steel plates with an external copper conductive paint layer; the upper heating tube 10-14 also contains an internal heating tube temperature sensor 10-5 communicating with its inner cavity and an external heating tube temperature sensor 10-9 installed on the external insulation layer of the heating coil 10-6; both the internal heating tube temperature sensor 10-5 and the external heating tube temperature sensor 10-9 are connected to the heating controller 7 via data cables. The antimagnetic plates 10-12 can prevent the heating coil 10-6 from causing electromagnetic radiation and interference to the surrounding environment.

[0066] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. An electromagnetic heating device for an oil-gas mixture, comprising a heating body (10), the heating body (10) mainly consisting of an upper heating tube (10-14) and a lower heating tube (10-15), the outer walls of the upper heating tube (10-14) and the lower heating tube (10-15) are each provided with a heating coil (10-6) and connected by a mixing bend (10-10), the mixing bend (10-10) being equipped with an internal pressure sensor (10-13), the upper... The heating tube (10-14) is connected to the outlet line (10-1), and the outlet line (10-1) is equipped with a one-way valve (8). The lower heating tube (10-15) is connected to the inlet line (10-3). The oil-gas mixture enters from the inlet line (10-3) and exits from the outlet line (10-1). Both the inlet line (10-3) and the outlet line (10-1) are equipped with a delivery line temperature sensor (10-2). Its characteristic is that: The upper heating tube (10-14) is connected to the air bladder in the gas buffer tank (4) through the gas collecting tube (3). The gas buffer tank (4) is fixed with an external pressure sensor (5) and an internal pressure sensor (6). The gas delivery line (11) is equipped with a gas-liquid mixed delivery pump (2) and an automatic exhaust valve (1). One end of the gas delivery line (11) is fixed in the air bladder in the gas buffer tank (4), and the other end is connected to the liquid outlet line (10-1) behind the one-way valve (8). The automatic exhaust valve (1), the gas-liquid mixed delivery pump (2) and the heating coil (10-6) are all electrically connected to the heating controller (7) and connected through a data line. The delivery line temperature sensor (10-2), the external pressure sensor (5), the internal pressure sensor (6) and the internal pressure sensor (10-13) are all connected to the heating controller (7) through a data line.

2. The electromagnetic heating device for an oil-gas mixture as described in claim 1, characterized in that, The upper heating tube (10-14) and the lower heating tube (10-15) are further provided with a copper skid conductive layer (10-4), which is an 8mm-10mm copper cylinder and is interference-fitted with the inner cavity of the upper heating tube (10-14) and the lower heating tube (10-15).

3. An electromagnetic heating device for an oil-gas mixture as described in claim 1 or 2, characterized in that, in The upper heating tube (10-14) and the lower heating tube (10-15) are further provided with a gas-liquid turbulence tube (10-7) in the middle tube body. The gas-liquid turbulence tube (10-7) is a tube body with an inner diameter that is 80mm-90mm smaller than the inner diameter of the upper heating tube (10-14) and the lower heating tube (10-15).

4. The electromagnetic heating device for an oil-gas mixture as described in claim 3, characterized in that, The airbag is an inflatable bag-shaped body made of rubber. The bottom of the airbag is fixed to the bottom of the gas buffer tank (4). The height of the airbag before inflation is two-thirds of the height of the inner cavity of the gas buffer tank (4). The external pressure sensor (5) of the airbag is fixed in the inner wall of the gas buffer tank (4) at three-quarters of its height.

5. The electromagnetic heating device for an oil-gas mixture as described in claim 4, characterized in that, The gas collecting pipe (3) is provided with two pipes. One end of the two gas collecting pipes (3) is connected to the upper heating pipes (10-14) on both sides of the gas-liquid turbulence pipe (10-7), and the other end is connected to the bottom of the gas bladder in the gas buffer tank (4). Each of the two gas collecting pipes (3) is provided with a gas energy storage pipe (12). The diameter of the gas energy storage pipe (12) is larger than the diameter of the gas collecting pipe (3) and it is located near the gas buffer tank (4).

6. The electromagnetic heating device for an oil-gas mixture as described in claim 3, characterized in that, The power of the heating coil (10-6) in the lower heating tube (10-15) is higher than the power of the heating coil (10-6) in the upper heating tube (10-14).

7. The electromagnetic heating device for an oil-gas mixture as described in claim 6, characterized in that, The outer walls of the upper heating tube (10-14) and the lower heating tube (10-15) of the heating body (10) are provided with an insulation layer, a mica plate, a heating coil (10-6), an insulation layer and an electromagnetic shielding layer (10-8) composed of nickel-plated carbon fiber in sequence from the inside to the outside; the outer wall of the mixed flow bend (10-10) is provided with an insulation layer.

8. The electromagnetic heating device for an oil-gas mixture as described in claim 7, characterized in that, in The inner wall of the copper skid conductive layer (10-4) in the upper heating tube (10-14) and the lower heating tube (10-15) is coated with an anti-corrosion layer (9), which is made of boron nitride paint spraying; the inner wall of the liquid inlet line (10-3), the liquid outlet line (10-1), the gas-liquid turbulence pipe (10-7) and the mixing bend pipe (10-10) is chrome plated.

9. The electromagnetic heating device for an oil-gas mixture as described in claim 7, characterized in that, The insulation layer in the heating element (10) is a ceramic fiber cotton layer with a thickness between 18mm and 22mm. The insulation layer is set on both sides of the mica plate and the heating coil (10-6).

10. The electromagnetic heating device for an oil-gas mixture as described in claim 8, characterized in that, The automatic exhaust valve (1) is a solenoid valve; both ends of the upper heating tube (10-14) and the lower heating tube (10-15) are equipped with antimagnetic plates (10-12), which are steel plates with copper conductive paint coating on the outside; the upper heating tube (10-14) is also equipped with an internal heating tube temperature sensor (10-5) connected to its inner cavity and an external heating tube temperature sensor (10-9) installed on the external insulation layer of the heating coil (10-6); the internal heating tube temperature sensor (10-5) and the external heating tube temperature sensor (10-9) are both connected to the heating controller (7) via data lines.

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