Intelligent electromagnetic heating device for oil and gas field wellhead

Abstract

The oil and gas field wellhead intelligent electromagnetic heating device of the present invention belongs to the oil and gas field wellhead production material heat exchange and external transmission device, including a heat transfer oil storage tank, an electromagnetic heater and an electromagnetic control cabinet, and also includes a spiral annulus heat exchanger, wherein the spiral annulus heat exchanger is composed of a spiral inner tube set inside a spiral outer sleeve with a closed inner hollow at both ends, and a medium inlet and a medium outlet are respectively provided at both ends of the spiral outer sleeve, and the spiral inner tube passes through the two ends of the spiral outer sleeve; the bottom outlet pipeline of the heat transfer oil storage tank is connected to the medium inlet at one end of the spiral outer sleeve, a circulating pump is installed on the pipeline, the medium outlet pipeline at the other end is connected to one end of the electromagnetic heater, and the outlet pipeline at the other end of the electromagnetic heater is connected to the heat transfer oil storage tank. The oil and gas field wellhead intelligent electromagnetic heating device of the present invention has a reasonable structural design, the heating device will not be directly exposed to the outside, and the internal heat transfer oil is always circulated and heated, which can prevent the equipment from burning dry and causing danger.

Description

Technical Field

[0001] The invention belongs to a heat exchange and external transmission device for produced materials at a wellhead of an oil and gas field, and in particular relates to an intelligent electromagnetic heating device at a wellhead of an oil and gas field. Background Art

[0002] The produced fluid from oilfield production wells contains oil, gas, water, sand, and a mixture that is produced from the oil wells at the same time. It is transported to the metering room through pipelines and then transferred to the transfer station and the joint station for separation. A hot water heating pipeline is installed from the transfer station to each wellhead. The hot water in the heating pipeline is mixed with the produced material at the wellhead to increase the temperature and then transported to the metering room and then to the transfer station for separation. This not only increases the initial construction investment, but also increases the processing load for subsequent production operations, increases the difficulty of management, and wastes manpower and material resources. In recent years, the heating pipelines next to the produced fluid transportation pipelines between some oilfield production wells and transfer stations have been cancelled, and electric heating devices are used at the wellhead to directly heat or heat the produced fluid for transportation. The heating method mostly adopts resistive heating, such as electric heating rod heating, low resistance and high current heating, etc. This kind of resistive heating is dangerous when used in oilfields and oil wells containing flammable and explosive natural gas produced liquid environments. If the produced liquid is insufficient and the natural gas content is high, making the heating part half liquid and half gas, the part of the electric heating rod exposed to the natural gas or the part of the metal pipe directly in contact with the natural gas is in a dry burning state, which not only has a poor heating effect, but also easily causes combustion or explosion; even if it is always full of liquid during heating, it will need to be frequently replaced and repaired due to the short service life of the resistance heating components. There are also electromagnetic heating methods, such as the invention patent "An electromagnetic heater" application number: 202010180570.9, which uses electromagnetic coils, ceramic tubes, and metal rods. The electromagnetic coil heats the metal rod to heat the produced liquid flowing through the annulus formed by the metal rod and the ceramic tube. This also has the hidden danger of dry burning caused by the gas-containing produced liquid not filling the annulus. The invention patent "An electromagnetic heating oil and gas mixed transmission method" application number: 201910710480.3, the patent uses electromagnetic heating, the electromagnetic coil is wrapped around the outside of the metal pipe message insulation layer, the metal pipe is directly heated, and the metal pipe transfers the heat to the mixed infusion, and the mixed infusion contains natural gas, there are still problems of dry burning and poor heating effect, which reduces the service life of the equipment, especially there are safety hazards. The invention patent "An electromagnetic heating energy storage device" application number: 201921034749.2, the patent uses electromagnetic heaters, heat medium storage tanks, heat exchange coils in the storage tanks and heat medium in combination, belonging to the field of energy storage equipment, there are dead corners in the storage tank, the heat medium in the storage tank has an area that is difficult to flow, the heat medium has the disadvantage of straight in and out through the upper and lower inlets and outlets of the storage tank, and the heat exchange is not thorough. Summary of the invention

[0003] The present invention aims to overcome the deficiencies of the prior art and provides an intelligent electromagnetic heating device for an oil and gas field wellhead.

[0004] The intelligent electromagnetic heating device for oil and gas field wellheads of the present invention comprises a heat transfer oil storage tank, an electromagnetic heater and an electromagnetic control cabinet, and also comprises a spiral annulus heat exchanger. The spiral annulus heat exchanger is composed of a spiral inner tube mounted inside a spiral outer sleeve with a hollow interior closed at both ends, a medium inlet and a medium outlet are respectively provided at both ends of the spiral outer sleeve, and the spiral inner tube passes through both ends of the spiral outer sleeve; the bottom outlet pipeline of the heat transfer oil storage tank is connected to the medium inlet at one end of the spiral outer sleeve, a circulating pump is installed on the pipeline, the medium outlet pipeline at the other end is connected to one end of the electromagnetic heater, and the outlet pipeline at the other end of the electromagnetic heater is connected to the heat transfer oil storage tank; an electromagnetic coil is provided on the outer wall of the electromagnetic heater and is connected to the electromagnetic control cabinet cable.

[0005] As a further improvement of the present invention, an electromagnetic induction heating tube fixed to the shell is provided inside the shell of the electromagnetic heater.

[0006] As a further improvement of the present invention, a protective sleeve is sleeved on the outside of the electromagnetic heater.

[0007] As a further improvement of the present invention, a spiral heat exchange coil is covered on the outer wall of the electromagnetic heater, and the lower inlet pipeline and the upper outlet pipeline of the spiral heat exchange coil both pass through the wall of the casing and are connected to the cooling water tank; a cooling water pump is provided on the pipeline between the lower inlet of the spiral heat exchange coil and the lower outlet of the cooling water tank, and a radiator is provided on the pipeline between the upper outlet and the upper inlet of the cooling water tank.

[0008] As a further improvement of the present invention, a fan is provided on the electromagnetic control cabinet, and an air outlet of the fan faces the radiator.

[0009] As a further improvement of the present invention, a liquid level sensor is installed on the wall of the thermal oil storage tank, a breathing valve is provided at the top, and a drain valve is provided at the bottom. A temperature sensor is provided on the pipeline connecting the upper inlet of the thermal oil storage tank and the upper outlet of the electromagnetic heater.

[0010] As a further improvement of the present invention, a circulation pump is provided on the pipeline connecting the lower end outlet of the heat transfer oil storage tank and the inlet end of the spiral outer sleeve.

[0011] As a further improvement of the present invention, the outer wall of the spiral outer sleeve is covered with a heat-insulating layer.

[0012] As a further improvement of the present invention, temperature sensors are provided at both the outlet and inlet ends of the spiral inner tube.

[0013] The intelligent electromagnetic heating device for an oil and gas field wellhead of the present invention has a reasonable structural design. The heating device will not be directly exposed to the outside and the heat transfer oil is always circulated and heated inside, which can prevent the danger caused by dry burning of the equipment. It has the characteristics of safety, reliability, high efficiency and energy saving, environmental protection, unmanned operation, remote control, long service life, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an intelligent electromagnetic heating device for oil and gas field wellheads according to the present invention;

[0015] Figure 2 yes Figure 1 A magnified schematic diagram of middle I;

[0016] Figure 3 It is a schematic structural diagram of another embodiment of the present invention. DETAILED DESCRIPTION

[0017] Example 1

[0018] An intelligent electromagnetic heating device for oil and gas field wellheads according to the present invention is as follows: Figure 1 , Figure 2 As shown, it includes a heat transfer oil storage tank 1, an electromagnetic heater 2, an electromagnetic control cabinet 3 and a spiral annular heat exchanger 6. The spiral annular heat exchanger 6 is composed of a spiral inner tube 8 set inside a spiral outer sleeve 7 with a hollow interior and closed at both ends, and a medium inlet and a medium outlet are respectively provided at both ends of the spiral outer sleeve 7, and the spiral inner tube 8 passes through both ends of the spiral outer sleeve 7. The outer wall of the spiral outer sleeve 7 is wrapped with a thermal insulation layer 17, and temperature sensors 14 are arranged at the outlet and inlet ends of the spiral inner tube 8. The bottom outlet of the thermal oil storage tank 1 is connected to the medium inlet at one end of the spiral outer sleeve 7 through a circulating pump 16 pipeline, and the medium outlet pipeline at the other end is connected to the lower end of the electromagnetic heater 2, and the upper outlet pipeline of the electromagnetic heater 2 is connected to the thermal oil storage tank 1; a liquid level sensor 12 is installed on the tank wall of the thermal oil storage tank 1, a breathing valve 13 with the function of adding thermal oil is arranged at the top, and a drain valve 15 is arranged at the bottom. A temperature sensor 14 is arranged on the pipeline connecting the upper inlet of the thermal oil storage tank 1 and the upper outlet of the electromagnetic heater 2, and the electromagnetic heater 2 is provided with more than one electromagnetic induction heating tube 19 inside, and an electromagnetic coil is arranged on the outer wall and connected to the electromagnetic control cabinet 3 by cable; the outer wall of the shell of the electromagnetic heater 2 is wrapped with a thermal insulation layer, and the electromagnetic coil is wound outside the thermal insulation layer and connected to the electromagnetic control cabinet cable. An electromagnetic induction heating tube 19 is installed inside the electromagnetic heater shell to increase the heat exchange area, and an annulus is left between the two. The heat transfer oil enters from the lower end of the electromagnetic heater, moves upward through the annular space between the electromagnetic heater and the electromagnetic induction heating tube 19 and the inside of the electromagnetic induction heating tube 19, and exchanges heat with the inner surface of the electromagnetic heater shell and the inner and outer surfaces of the electromagnetic induction heating tube 19, and finally enters the heat transfer oil storage tank through the outlet pipe at the upper end of the electromagnetic heater.

[0019] At the same time, the electromagnetic heater 2 is provided with a spiral heat exchange coil 5 covered with a gap outside the electromagnetic induction coil of the electromagnetic heater 2, and a protective tube 4 is sleeved on the outside. The lower inlet pipeline and the upper outlet pipeline of the spiral heat exchange coil 5 are both connected to the cooling water tank 11 through the wall of the protective tube 4; a cooling water pump 18 is provided on the pipeline between the lower inlet of the spiral heat exchange coil 5 and the lower outlet of the cooling water tank 11, and a radiator 10 is provided on the pipeline between the upper outlet and the upper inlet of the cooling water tank 11. The water flow in the cooling water tank 11 enters the spiral heat exchange coil 5 to exchange heat and cool the electromagnetic heater 2; the electromagnetic control cabinet 3 is divided into ordinary and explosion-proof types, and the cooling method is air cooling or water cooling. A fan 9 is provided on it, and the air outlet of the fan 9 faces the radiator 10. The fan 9 and the radiator 10 cool the water flowing back to the cooling water tank 11. The liquid level sensor 12, temperature sensor 14, circulation pump 16, cooling water pump 18 are all connected to the electromagnetic control cabinet and the database of the general control system, and the data can be remotely detected and the device can be controlled through a mobile phone or computer.

[0020] An intelligent electromagnetic induction heating device for oil and gas field wellheads of the present invention can be placed in a skid-mounted board house, and a circulating pump 16 is started. The heat-conducting oil in the heat-conducting oil storage tank 1 enters the annular space formed by the spiral outer sleeve 7 and the spiral inner pipe 8 through a pipeline, and then enters the electromagnetic heater 2 through a pipeline. After being heated by the electromagnetic heater 2, it enters the spiral outer sleeve 7 through the heat-conducting oil storage tank 1, so that the interior of the spiral outer sleeve 7 is filled with the heated heat-conducting oil. Then, the inlet of the spiral inner pipe 8 is connected to the outlet of the oil and gas well, and the outlet of the spiral inner pipe 8 is connected to the external transmission pipeline. The produced medium can be heated by the heated heat-conducting oil, and after the heat is transferred to the produced medium, it is sent to the electromagnetic heater 2 for heating through a circulating pump. The heat-conducting oil after heat exchange is then sent to the heat-conducting oil storage tank 1. By setting a value for the temperature sensor, the electromagnetic coil of the electromagnetic heater 2 automatically works between half load and full load, and the temperature is increased or decreased. This cycle repeats. When the heating of the produced medium does not require the originally set temperature value, it can be modified by wireless remote operation through a mobile phone or a computer, and has functions such as fault alarm, start and stop control, and report printing. When the heat transfer oil deteriorates after long-term use and needs to be replaced, it is discharged through the drain valve 15 at the bottom of the heat transfer oil storage tank 1. When the electromagnetic heater 2 is working, the spiral heat exchange coil 5 cools it at the same time, the cooling water tank 11 is opened, and the water flows through the cooling water pump 18 and is sent to the spiral heat exchange coil 5. The electromagnetic heater 2 is cooled by the cold water filled in the spiral heat exchange coil 5. The water flows through the radiator 10 in the process of returning to the cooling water tank 11 through the pipeline. The fan 9 and the radiator 10 will cool the water flowing back to the cooling water tank 11, so that the water in the cooling water tank 11 always maintains a low temperature. The outer sleeve 4 is used to prevent the cooling temperature of the spiral heat exchange coil 5 from radiating outward to achieve a full heat exchange effect and extend the service life of the electromagnetic coil.

[0021] The device heats the heat transfer oil through the electromagnetic heater 2, and the heated heat transfer oil is input into the spiral annular heat exchanger 6 made of two metal tubes set together through the circulation pump to heat the produced liquid in the spiral inner tube 8. Heat exchange is adopted instead of direct heating, so there is no need to consider the changes of natural gas in the heat exchange tube, and dry burning is avoided. The spiral inner tube 8 in the center of the spiral annular heat exchanger 6 where the high-pressure gas-liquid mixed medium flows is made of thick-walled seamless steel pipe to adapt to high-pressure operating conditions. Since the spiral annular heat exchanger made of two metal tubes is uniform and has no dead angle, there is no area where the heat transfer oil does not flow, and the heat exchange effect is good. Compared with the U-shaped heat exchanger, the spiral annular heat exchanger has the following advantages: no elbow connection, fewer welds, fewer hidden dangers, stable medium flow direction, no backflow and no obstruction. When the high-pressure gas-liquid mixed medium in the spiral inner tube 8 is released from high pressure through the oil nozzle and changes to low pressure and needs to absorb a large amount of heat, the spiral annulus heat exchanger 6 fully meets the heat absorption needs of the high-pressure gas-liquid mixed medium in the spiral inner tube 8, avoiding the problem of oil field gas well shutdown due to oil nozzle freezing and the need for construction work to unblock the blockage. It is safe, reliable, environmentally friendly and energy-saving, saving a lot of manpower and material resources.

[0022] The inlet of the spiral inner tube 8 of the spiral annular heat exchanger is connected to the outlet of the oil and gas well, and the outlet of the spiral inner tube 8 is connected to the external transmission pipeline. The spiral outer sleeve 7 of the spiral annular heat exchanger 6 is sleeved on the outside of the spiral inner tube 8, and the spiral outer sleeve 7 and the spiral inner tube 8 form an annular space. The inlet of the spiral outer sleeve 7 is connected to the outlet of the heat transfer oil storage tank 1. The heat transfer oil storage tank 1 is placed above the spiral annular heat exchanger 6. The inlet of the heat transfer oil storage tank 1 is connected to the outlet of the electromagnetic heater 2 through a pipeline. A temperature sensor is installed on the outlet pipeline of the electromagnetic heater 2. The circulating pump 16 is installed on the pipeline between the outlet of the heat transfer oil storage tank 1 and the inlet of the spiral outer sleeve 7. The breathing valve, liquid level sensor, and drain valve are installed on the oil tank of the oil storage tank. The temperature sensor and liquid level sensor are connected to the intelligent control system. The heat transfer oil is installed in the oil storage tank, pipeline, and inner and outer spiral annular pipes. The outer wall of the entire heat transfer oil system pipeline and equipment is wrapped with a thermal insulation layer.

[0023] The produced fluid from the oil and gas wells enters through the spiral inner tube 8 inlet of the spiral annulus heat exchanger, absorbs heat in the spiral inner tube 8 and outputs from the outlet of the spiral inner tube 8. The heat transfer oil in the heat transfer oil storage tank 1 flows into the spiral outer casing 7 and the annulus of the spiral inner tube 8 through the pipeline via the oil pump, transfers heat to the produced fluid in the spiral inner tube 8 and then flows out, and is then sent to the electromagnetic heater for heating through the circulation pump. After heating, the heat transfer oil is sent to the heat transfer oil storage tank 1, and the cycle is repeated.

[0024] Example 2

[0025] According to the needs of oil and gas wells, the spiral annulus heat exchanger 6 can also be made into a "Z" shape, such as Figure 3 As shown, the upper part is connected to the wellhead, and the lower part is buried underground toward the metering station, and the overall intelligent electromagnetic heating device is located at a certain distance from the wellhead and beside the end of the heat exchanger. Other aspects are the same as in Example 1.

Claims

1. An intelligent electromagnetic heating device for a wellhead of an oil and gas field, comprising a heat transfer oil storage tank (1), an electromagnetic heater (2) and an electromagnetic control cabinet (3), characterized in that It also includes a spiral annular heat exchanger (6), which is composed of a spiral inner tube (8) mounted inside a spiral outer sleeve (7) with a hollow interior and closed at both ends, and a medium inlet and a medium outlet respectively arranged at both ends of the spiral outer sleeve (7), and the spiral inner tube (8) passes through both ends of the spiral outer sleeve (7); the bottom outlet pipeline of the heat transfer oil storage tank (1) is connected to the medium inlet at one end of the spiral outer sleeve (7), the medium outlet pipeline at the other end is connected to one end of the electromagnetic heater (2), and the outlet pipeline at the other end of the electromagnetic heater (2) is connected to the heat transfer oil storage tank (1); an electromagnetic coil is arranged on the outer wall of the electromagnetic heater (2) and is connected to the electromagnetic control cabinet (3) by a cable; An electromagnetic induction heating tube (19) fixed to the shell is provided in the shell of the electromagnetic heater (2), and an annular space is left between the two to increase the heat exchange area; A protective sleeve (4) is sleeved on the outside of the electromagnetic heater (2); A spiral heat exchange coil (5) is provided on the outer wall of the electromagnetic heater (2); the lower inlet pipeline and the upper outlet pipeline of the spiral heat exchange coil (5) are both connected to the cooling water tank (11) through the wall of the casing (4); a cooling water pump (18) is provided on the pipeline between the lower inlet of the spiral heat exchange coil (5) and the lower outlet of the cooling water tank (11); and a radiator (10) is provided on the pipeline between the upper outlet and the upper inlet of the cooling water tank (11).

2. The intelligent electromagnetic heating device for oil and gas field wellhead according to claim 1, characterized in that The electromagnetic control cabinet (3) is provided with a fan (9), and an air outlet of the fan (9) faces the radiator (10).

3. The intelligent electromagnetic heating device for oil and gas field wellhead according to claim 1, characterized in that A liquid level sensor (12) is installed on the tank wall of the thermal oil storage tank (1), a breathing valve (13) is provided at the top, and a drain valve (15) is provided at the bottom. A temperature sensor (14) is provided on the pipeline connecting the upper inlet of the thermal oil storage tank (1) and the upper outlet of the electromagnetic heater (2).

4. The intelligent electromagnetic heating device for oil and gas field wellhead according to claim 1, characterized in that A circulation pump (16) is provided on the pipeline connecting the outlet at the lower end of the heat transfer oil storage tank (1) and the inlet end of the spiral outer sleeve (7).

5. The intelligent electromagnetic heating device for oil and gas field wellhead according to claim 1, characterized in that The outer wall of the spiral outer sleeve (7) is covered with a heat-insulating layer (17).

6. The intelligent electromagnetic heating device for oil and gas field wellhead according to claim 1, characterized in that Temperature sensors (14) are provided at both the outlet and inlet ends of the spiral inner tube (8).

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