Oil and gas field wellhead solar and electric energy heat accumulating type heating device and method

Abstract

The application discloses an oil and gas field wellhead solar energy and electric energy heat accumulation type heating device and method, and belongs to the technical field of oil and gas field exploitation. The inlet and outlet of a heat exchanger are connected with an inlet pipe and an outlet pipe respectively, the outlet pipe is connected with pipe a and pipe b, pipe a provided with valve c is connected with the inlet of a solar water heater, the outlet of the solar water heater is connected with pipe c, pipe b is provided with valve d, pipe b and pipe c are connected with pipe d, pipe d is connected with pipe e provided with valve e and pipe f provided with valve f, pipe e is connected with heat accumulation tank b, heat accumulation tank b is connected with the inlet pipe through pipe h, valve b is arranged on the pipe h, pipe f is connected with heat accumulation tank a, and heat accumulation tank a is connected with the inlet pipe through pipe g, and valve a is arranged on the pipe g. The application has the beneficial effects that low-price off-peak electricity and free solar energy are fully utilized to heat oil and gas field wellhead produced materials, and the economic efficiency and environmental protection of the oil and gas field wellhead produced material heating are improved.

Description

Technical Field

[0001] This invention relates to a device and method for solar and electric energy storage heating at the wellhead of an oil and gas field, belonging to the field of oil and gas field development technology. Background Technology

[0002] After crude oil and natural gas are extracted from wells, they often need to be heated at the wellhead to ensure their smooth transport to transfer stations and combined stations for centralized processing. Currently, the main heating methods are gas-fired heaters and electric heating. Gas-fired heaters have lower heating costs but are less environmentally friendly, especially when associated gas is used as fuel. The complex composition of associated gas can easily cause environmental pollution, and increasing pressure to reduce carbon dioxide emissions will limit the future use of gas-fired heaters. While electric heating is pollution-free, its operating costs are higher, making it less economical. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a device and method for solar and electric energy storage heating at the wellhead of oil and gas fields. This method fully utilizes off-peak electricity from the power grid and solar energy to heat extracted materials such as crude oil and natural gas at the wellhead, thereby maximizing the economic efficiency of heating while ensuring environmental protection and carbon reduction.

[0004] The technical solution of this invention is: a device for solar and electric energy storage heating at the wellhead of an oil and gas field, wherein the inlet and outlet of a heat exchanger are connected to an inlet pipe and an outlet pipe, respectively; the outlet pipe is connected to pipe a and pipe b; pipe a, equipped with valve c, is connected to the inlet of a solar water heater; the outlet of the solar water heater is connected to pipe c; pipe b is equipped with valve d; the outlets of pipe b and pipe c are both connected to pipe d; pipe d is connected to pipe e, equipped with valve e, and pipe f, equipped with valve f, respectively; pipe e is connected to a heat storage tank b; heat storage tank b is connected to an inlet pipe via pipe h, equipped with valve b; pipe f is connected to heat storage tank a; heat storage tank a is connected to an inlet pipe via pipe g, equipped with valve a.

[0005] The heat exchanger is equipped with a wellhead produced material inlet and a wellhead produced material outlet.

[0006] The heat storage tank b is equipped with an electric heater b.

[0007] The electric heater b uses off-peak electricity for heating.

[0008] The heat storage tank a is equipped with an electric heater a.

[0009] The electric heater a is heated using off-peak electricity a.

[0010] Pump a is installed on the pipe g.

[0011] Pump b is installed on the pipe h.

[0012] This invention also claims protection for a solar and electric energy storage heating method for oil and gas field wellheads. After the produced material enters the heat exchanger, valve a opens and valve b closes. Pump a pumps hot water from storage tank a into the heat exchanger to heat the produced material. After the produced material is heated, it is transported out, and the hot water cools down. If it is during the daytime when there is solar energy, valve c opens and valve d closes. The cooled hot water enters a solar water heater to be heated by solar energy, converting solar energy into the heat energy of the water. Then valve e opens and valve f closes, and the heated hot water enters storage tank b. If it is during the daytime when there is no solar energy, valve c closes, valve d opens, valve e opens, and valve f closes. The cooled hot water directly enters storage tank b. The hot water in storage tank b will be heated by an electric heater b during off-peak hours using off-peak electricity, transferring the off-peak electricity energy into the hot water.

[0013] After the off-peak electricity period ends, the hot water in storage tank b is full of off-peak electricity and solar energy. Then valve a closes and valve b opens. Pump b pumps the hot water from storage tank b into the heat exchanger to heat the produced material. The produced material is then transported out after heating, and the hot water cools down. If it is a daytime period with solar energy, valve c opens and valve d closes. The cooled hot water enters the solar water heater and is heated by solar energy, converting solar energy into thermal energy. Then valve e closes and valve f opens, and the heated hot water enters storage tank a. If it is a period without solar energy, valve c closes and valve d opens, valve e closes and valve f opens, and the cooled hot water directly enters storage tank a. The hot water in storage tank a will be heated by electric heater a during off-peak electricity periods, transferring the off-peak electricity energy into the hot water. After the off-peak electricity period ends, the hot water in storage tank a is full of off-peak electricity and solar energy.

[0014] The above process forms a cycle. After one cycle is completed, the above steps are repeated.

[0015] The beneficial effects of this invention are: making full use of low-cost off-peak electricity and free solar energy to heat the produced materials at the wellhead of oil and gas fields, thereby improving the economy and environmental friendliness of heating the produced materials at the wellhead of oil and gas fields. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention.

[0017] The following labels are used in the attached diagram: 1. Heat exchanger, 2. Wellhead produced material inlet, 3. Pump a, 4. Heat storage tank a, 5. Electric heater a, 6. Off-peak electricity a, 7. Off-peak electricity b, 8. Electric heater b, 9. Heat storage tank b, 10. Pump b, 11. Solar water heater, 12. Wellhead produced material outlet, 13. Valve a, 14. Valve b, 15. Valve c, 16. Valve d, 17. Valve e, 18. Valve f, 19. Inlet pipe, 20. Outlet pipe, 21. Pipe a, 22. Pipe b, 23. Pipe c, 24. Pipe d, 25. Pipe e, 26. Pipe f, 27. Pipe g, 28. Pipe h. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 Further explanation of the present invention:

[0019] Example 1

[0020] A device for solar and electric energy storage heating at the wellhead of an oil and gas field is disclosed. The inlet and outlet of a heat exchanger 1 are connected to an inlet pipe 19 and an outlet pipe 20, respectively. The heat exchanger 1 has a wellhead produced material inlet 2 and a wellhead produced material outlet 12. The outlet pipe 20 is connected to pipes a21 and b22. Pipe a21, equipped with valve c15, is connected to the inlet of a solar water heater 11. The outlet of the solar water heater 11 is connected to pipe c23. Pipe b22 is equipped with valve d16. The outlets of both pipe b22 and pipe c23 are connected to pipe d24. Pipe d24 is connected to… Pipe e25, which is equipped with valve e17, and pipe f26, which is equipped with valve f18, are respectively connected to heat storage tank b9. Heat storage tank b9 is equipped with electric heater b8 that is heated by off-peak electricity b7. Heat storage tank b9 is connected to inlet pipe 19 through pipe h28. Pipe h28 is equipped with valve b14 and pump b10. Pipe f26 is connected to heat storage tank a4. Heat storage tank a4 is equipped with electric heater a5 that is heated by off-peak electricity a6. Heat storage tank a4 is connected to inlet pipe 19 through pipe g27. Pipe g27 is equipped with valve a13 and pump a3.

[0021] Example 2

[0022] A method for solar and electric energy storage heating at the wellhead of an oil and gas field is disclosed. After the produced material enters heat exchanger 1, valve a13 opens and valve b14 closes. Pump a3 pumps hot water from storage tank a4 into heat exchanger 1 to heat the produced material. After the produced material is heated, it is transported out through outlet 12. The hot water cools down. If it is during the daytime when there is solar energy, valve c15 opens and valve d16 closes. The cooled hot water enters solar water heater 11 to be heated by solar energy, converting solar energy into thermal energy. Then, valve e17 opens and valve f18 closes, and the heated hot water enters storage tank b9. If it is during the daytime when there is no solar energy, valve c15 closes, valve d16 opens, valve e17 opens, and valve f18 closes. The cooled hot water directly enters storage tank b9. During off-peak hours, the hot water in storage tank b9 is heated by electric heater b8 using off-peak electricity b7, transferring the off-peak electricity energy into the hot water.

[0023] After the off-peak electricity period ends, the hot water in the heat storage tank b9 is full of off-peak electricity and solar energy. Then, valve a13 closes, valve b14 opens, and pump b10 pumps the hot water from the heat storage tank b9 into heat exchanger 1 to heat the produced material. After the produced material at the wellhead is heated, it is transported out through 12, and the hot water cools down. If it is during the daytime when there is solar energy, valve c15 opens, valve d16 closes, and the cooled hot water enters the solar water heater 11 to be heated by solar energy, converting solar energy into the heat energy of the water. Then, valve e... When valve 17 is closed and valve f18 is opened, the heated hot water enters the heat storage tank a4. If there is no solar energy, valve c15 is closed, valve d16 is open, valve e17 is closed, and valve f18 is open, so the cooled hot water directly enters the heat storage tank a4. During off-peak hours, the hot water in the heat storage tank a4 is heated by electric heater a5 using off-peak electricity a6, transferring the off-peak electricity energy into the hot water. When the off-peak electricity period ends, the hot water in the heat storage tank a4 is full of off-peak electricity energy and solar energy.

[0024] The above process forms a cycle. After one cycle is completed, the above steps are repeated.

[0025] Example 3

[0026] The temperature of the wellhead produced material is 15℃, requiring 30kW of heat to heat it. After heating, the temperature of the wellhead produced material 12 is 35℃. The time interval between heat storage and release in heat storage tanks a4 and b9 is 24 hours, therefore the required volume of heat storage tanks a4 and b9 is 12m³. 3 The heat storage tank a4 contains hot water that has stored heat from the previous cycle, while the heat storage tank b9 is empty and ready to receive the water that has been cooled down by heat transfer from the heat storage tank a4.

[0027] After the wellhead extract enters heat exchanger 1, valve a13 opens and valve b14 closes. Pump a3 pumps hot water from heat storage tank a4 into heat exchanger 1 to heat the extract. The wellhead extract 12 is heated to 35℃ and then transported out, while the hot water temperature drops from 95℃ to 45℃. Solar water heater 11 has a power of 30kW and can utilize solar energy for 4 hours. During these 4 hours, valve c15 opens and valve d16 closes. The cooled hot water is heated by solar energy in solar water heater 11, converting solar energy into thermal energy. Then, valve e17 opens and valve f18 closes, and the heated hot water enters heat storage tank b9. During the additional 20 hours when solar energy cannot be utilized, valve C15 is closed, valve D16 is open, valve E17 is open, and valve F18 is closed. The cooled hot water directly enters the heat storage tank B9. During off-peak electricity hours, the hot water in tank B9 is heated by electric heater B8 using off-peak electricity B7, transferring the electrical energy of the off-peak electricity into the hot water. Off-peak electricity B7 can be utilized for 7 hours, and electric heater B8 has a power of 90kW. Therefore, before the end of the off-peak electricity period, the water in tank B9 will be full enough to heat the wellhead extract for the next 24 hours.

[0028] Example 4

[0029] After the off-peak electricity period in Example 3 ends, the water in heat storage tank a4 has been drained into heat storage tank b9, and heat storage tank b9 is full of heat. After the wellhead extract 2 enters the heat exchanger 1, valve a13 closes and valve b14 opens. Pump b10 pumps the hot water in heat storage tank b9 into heat exchanger 1 to heat the extract. The wellhead extract 12 is heated to 35°C and then transported out, while the hot water temperature drops from 95°C to 45°C. The solar water heater 11 has a power of 30kW and can utilize solar energy for 4 hours. During these 4 hours, valve c15 opens and valve d16 closes. The cooled hot water is heated by solar energy in solar water heater 11, converting solar energy into the heat energy of the water. Then valve e17 closes and valve f18 opens, and the heated hot water enters heat storage tank a4. During the additional 20 hours when solar energy cannot be utilized, valve C15 is closed, valve D16 is open, valve E17 is closed, and valve F18 is open. The cooled hot water directly enters the heat storage tank A4. During off-peak electricity hours, the hot water in tank A4 is heated by electric heater A5 using off-peak electricity A6, transferring the electrical energy of the off-peak electricity into the hot water. Off-peak electricity A6 can be utilized for 7 hours. Electric heater A5 has a power of 90kW. Therefore, before the end of the off-peak electricity period, the water in heat storage tank A4 will be full enough to heat the wellhead extract for the next 24 hours.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solar and electric energy storage heating method for oil and gas field wellheads, characterized in that, A solar and electric energy storage heating device is used at the wellhead of an oil and gas field. The device includes a heat exchanger (1) with an inlet pipe (19) and an outlet pipe (20) connected to the inlet and outlet respectively. The outlet pipe (20) is connected to pipe a (21) and pipe b (22). Pipe a (21) with valve c (15) is connected to the inlet of a solar water heater (11). The outlet of the solar water heater (11) is connected to pipe c (23). Pipe b (22) is equipped with valve d (16). Pipe b (22) and pipe c (23) are connected to each other. The outlets are all connected to pipe d (24), which is connected to pipe e (25) with valve e (17) and pipe f (26) with valve f (18). Pipe e (25) is connected to heat storage tank b (9), which is connected to inlet pipe (19) via pipe h (28). Pipe h (28) is equipped with valve b (14). Pipe f (26) is connected to heat storage tank a (4), which is connected to inlet pipe (19) via pipe g (27). The wellhead is equipped with valve a (13). After the wellhead extract enters the heat exchanger (1), valve a (13) opens and valve b (14) closes. Pump a (3) pumps hot water from the heat storage tank a (4) into the heat exchanger (1) to heat the extract. After the wellhead extract is heated, it is transported out. The hot water cools down. If it is during the daytime when there is solar energy, valve c (15) opens and valve d (16) closes. The cooled hot water enters the solar water heater (11) and is heated by solar energy, converting solar energy into water. The heat energy; then valve e (17) opens and valve f (18) closes, and the heated hot water enters the heat storage tank b (9); if it is a period without solar energy, then valve c (15) closes, valve d (16) opens, valve e (17) opens and valve f (18) closes, and the cooled hot water directly enters the heat storage tank b (9); the hot water in the heat storage tank b (9) will be heated by electric heater b (8) with off-peak electricity b (7) during off-peak hours, and the off-peak electricity energy will be transferred to the hot water; After the off-peak electricity period ends, the hot water in the heat storage tank b (9) is full of off-peak electricity and solar energy. Then valve a (13) is closed and valve b (14) is opened. Pump b (10) pumps the hot water in the heat storage tank b (9) into the heat exchanger (1) to heat the produced material. After the produced material at the wellhead is heated, it is transported out, and the hot water is cooled down. If it is during the daytime when there is solar energy, valve c (15) is opened and valve d (16) is closed. The cooled hot water enters the solar water heater (11) and is heated by solar energy, converting solar energy into the heat energy of the water. Then valve e (17) When the valve is closed and valve f(18) is opened, the heated hot water enters the heat storage tank a(4); if it is a period without solar energy, then valve c(15) is closed, valve d(16) is opened, valve e(17) is closed, and valve f(18) is opened, so the cooled hot water directly enters the heat storage tank a(4); the hot water in the heat storage tank a(4) will be heated by the electric heater a(5) with off-peak electricity a(6) during off-peak hours, and the off-peak electricity energy will be stored in the hot water; when the off-peak hours end, the hot water in the heat storage tank a(4) has been filled with off-peak electricity energy and solar energy; The above process forms a cycle. After one cycle is completed, the above steps are repeated.

2. The solar and electric thermal storage heating method for oil and gas field wellheads according to claim 1, characterized in that, The heat exchanger (1) is provided with a wellhead produced material inlet (2) and a wellhead produced material outlet (12).

3. The solar and electric thermal storage heating method for oil and gas field wellheads according to claim 1, characterized in that, Pump a (3) is installed on the pipe g (27).

4. The solar and electric thermal storage heating method for oil and gas field wellheads according to claim 1, characterized in that, Pump b (10) is installed on the pipe h (28).

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