Closed cooling water device for oilfield water injection station

Abstract

A closed cooling water device for an oilfield water injection station relates to the technical field of oilfield water injection systems and comprises a buffer tank, an air-cooled condenser and a console, and one side of the lower end of the buffer tank is connected with the buffer tank to demineralize a water pipeline; one side of the middle of the buffer tank is connected with a cooling water supply pump through a first buffer tank water outlet pipeline, the cooling water supply pump is connected with a cooling water supply pump water outlet pipeline, and the cooling water supply pump water outlet pipeline is connected with the air cooling type condenser through an air cooling type condenser circulating cooling water pipeline. The air cooling type condenser is connected with an equipment circulating cooling water pipeline through an air cooling type condenser water outlet pipeline; one side of the upper end of the buffer tank is connected with a buffer tank water inlet pipeline I; according to the utility model, a closed circulating cooling water technology and an air cooling technology are adopted, standard circulating cooling water can be provided for the oilfield water injection station, and clean water is not evaporated and consumed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field water injection systems, in particular to a closed cooling water device for an oil field water injection station. Background Art

[0002] With the continuous exploitation of oil fields, in order to ensure the continuous high and stable production of oil fields and improve the ultimate recovery rate of oil fields, many oil fields at home and abroad have adopted the method of injecting water into the oil layer to maintain the formation pressure and improve the recovery rate of oil wells. The oil field water injection system is a complex system engineering, mainly including water injection stations, water injection trunk and branch pipelines, water distribution valve groups, single well water injection pipelines and injection wellheads. Its main function is to inject the produced water that has been purified and stabilized by the produced water treatment station back into the formation. The water injection pumps used in the water injection station are divided into two categories: centrifugal water injection pumps and plunger water injection pumps. Among them, centrifugal water injection pumps and opposed plunger water injection pumps have large rated flow rates and are equipped with high-power motors. They generally use 10kV or 6kV three-phase asynchronous motors. During operation, a cooling water device is required to cool the motor and lubricating oil to ensure the long-term and stable operation of the water injection pump unit.

[0003] Oilfield water injection stations typically use open cooling water systems to provide cooling water for the injection pump units. These systems expose the cooling water to the elements for extended periods, leading to issues such as the inability to maintain consistent cooling water quality and high evaporation consumption. Currently, oilfield water injection stations are gradually replacing open cooling water systems with closed cooling water systems. These systems ensure consistent cooling water quality for the equipment, but they still require a large amount of clean water for spray cooling. Some oilfield water injection stations are located in remote areas with cold climates and water shortages. Both existing closed and open cooling water systems consume a large amount of water, resulting in a waste of water resources. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a closed cooling water device for an oilfield water injection station, which can solve the above technical problems.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A closed cooling water device for an oilfield water injection station comprises a buffer tank, an air-cooled condenser and a control console, wherein the lower end of the buffer tank is connected to a buffer tank desalted water pipeline; the middle part of the buffer tank is connected to a cooling water supply pump through a buffer tank outlet pipeline 1, the cooling water supply pump is connected to a cooling water supply pump outlet pipeline, the cooling water supply pump outlet pipeline is connected to the air-cooled condenser through an air-cooled condenser circulating cooling water pipeline, the air-cooled condenser is connected to the equipment circulating cooling water pipeline through the air-cooled condenser outlet pipeline; the upper end of the buffer tank is connected to a buffer tank inlet pipeline 1;

[0007] The cooling water supply pump outlet pipeline is connected to the equipment circulating cooling water pipeline; the air-cooled condenser outlet pipeline is connected to the buffer tank through the buffer tank inlet pipeline 2; the other side of the middle of the buffer tank is connected to a circulating water pump through the buffer tank outlet pipeline 2, and the circulating water pump is connected to the air-cooled condenser through the circulating water pump outlet pipeline.

[0008] Preferably, it also includes an air storage tank, the top of the air storage tank is connected to the air-cooled condenser through the air storage tank outlet pipeline, and the lower end of the air storage tank is connected to the air compressor through the air storage tank inlet pipeline.

[0009] Preferably, the top of the air-cooled condenser is connected to an air-cooled condenser exhaust pipeline, and an exhaust valve 1 is provided on the air-cooled condenser exhaust pipeline; and a fan is provided at the bottom of the air-cooled condenser.

[0010] Preferably, an ultrasonic level meter and a second exhaust valve are provided on the top of the buffer tank; and a buffer tank sewage pipe is connected to the bottom of the buffer tank.

[0011] Preferably, a cooling water flow meter is provided on the buffer tank outlet pipe 1, and electric switching valves are provided on the cooling water supply pump outlet pipe, the air-cooled condenser circulating cooling water pipe, the circulating water pump outlet pipe, the air-cooled condenser outlet pipe, the buffer tank inlet pipe 2 and the buffer tank sewage pipe. A temperature transmitter is also provided on the air-cooled condenser outlet pipe, and a gas flow meter and an electric regulating valve are provided on the gas storage tank outlet pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present device adopts closed-loop cooling water technology and air cooling technology, which can provide qualified circulating cooling water for oilfield water injection stations without evaporating and consuming clean water; the cooling water in the device circulates back and forth in a closed cycle between the buffer tank, the cooling water supply pump, the cooling water equipment and the air-cooled condenser, and almost no cooling water is consumed; the condenser tube of the air-cooled condenser of the device adopts a concentric double-thin-wall corrugated tube structure, which increases the heat exchange area between the air and the cooling water, and the air can cool the cooling water in the tube from both the inside and the outside at the same time, and the air and cooling water in the tube flow in a countercurrent manner, which greatly improves the efficiency of the air-cooled condenser. At the same time, it can automatically adjust the internal and external air flux to cope with different operating conditions; the device is equipped with a circulating water pump, which can make the cooling water circulate in the air-cooled condenser to cope with extreme operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 This is a flow chart of the utility model.

[0015] Description of reference numerals:

[0016] 1-buffer tank, 2-air-cooled condenser, 3-control console, 4-buffer tank desalted water pipeline, 5-buffer tank outlet pipeline 1, 6-cooling water supply pump, 7-cooling water supply pump outlet pipeline, 8-air-cooled condenser circulating cooling water pipeline, 9-air-cooled condenser outlet pipeline, 10-equipment circulating cooling water pipeline, 11-buffer tank inlet pipeline 1, 12-buffer tank inlet pipeline 2, 13-buffer tank outlet pipeline 2, 14-circulation Water pump, 15-circulating water pump outlet pipeline, 16-gas storage tank, 17-gas storage tank outlet pipeline, 18-gas storage tank inlet pipeline, 19-air compressor, 20-air-cooled condenser exhaust pipeline, 21-exhaust valve 1, 22-fan, 23-ultrasonic liquid level meter, 24-exhaust valve 2, 25-buffer tank drain pipeline, 26-cooling water flow meter, 27-electric switch valve, 28-temperature transmitter, 29-gas flow meter, 30-electric regulating valve. DETAILED DESCRIPTION

[0017] The following describes the invention of the present invention in detail by way of examples in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Example 1

[0019] like Figure 1As shown, the utility model discloses a closed cooling water device for an oilfield water injection station, comprising a buffer tank 1, an air-cooled condenser 2 and a control console 3, wherein the lower end of the buffer tank 1 is connected to a buffer tank desalted water pipeline 4; the middle part of the buffer tank 1 is connected to a cooling water supply pump 6 through a buffer tank outlet pipeline 5, and the buffer tank outlet pipeline 5 is provided with a cooling water flowmeter 26, the cooling water supply pump 6 is connected to a cooling water supply pump outlet pipeline 7, and the cooling water supply pump outlet pipeline 7 is connected to the air-cooled condenser 2 through an air-cooled condenser circulating cooling water pipeline 8, and the cooling water supply pump outlet pipeline 7 and the air-cooled condenser circulating cooling water pipeline 8 are both provided with an electric switch valve 27, and the air-cooled condenser 2 is cooled by air. The air-cooled condenser outlet pipe 9 is connected to the equipment circulating cooling water pipe 10, and the air-cooled condenser outlet pipe 9 is provided with an electric switch valve 27 and a temperature transmitter 28; one side of the upper end of the buffer tank 1 is connected to the buffer tank inlet pipe 1 11; the cooling water supply pump outlet pipe 7 is connected to the equipment circulating cooling water pipe 10; the air-cooled condenser outlet pipe 9 is connected to the buffer tank 1 through the buffer tank inlet pipe 2 12, and the buffer tank inlet pipe 2 12 is provided with an electric switch valve 27; the other side of the middle of the buffer tank 1 is connected to the circulating water pump 14 through the buffer tank outlet pipe 2 13, and the circulating water pump 14 is connected to the air-cooled condenser 2 through the circulating water pump outlet pipe 15, and the circulating water pump outlet pipe 15 is provided with an electric switch valve 27.

[0020] It also includes an air storage tank 16, the top of which is connected to the air-cooled condenser 2 via an air storage tank outlet pipe 17, a gas flow meter 29 and an electric regulating valve 30 are provided on the air storage tank outlet pipe 17, and one side of the lower end of the air storage tank 16 is connected to the air compressor 19 via an air storage tank inlet pipe 18.

[0021] The top of the air-cooled condenser 2 is connected to an air-cooled condenser exhaust pipeline 20, and an exhaust valve 21 is provided on the air-cooled condenser exhaust pipeline 20; the bottom of the air-cooled condenser 2 is provided with a fan 22.

[0022] An ultrasonic level meter 23 and a second exhaust valve 24 are provided on the top of the buffer tank 1 ; a buffer tank sewage pipe 25 is connected to the bottom of the buffer tank 1 , and an electric switch valve 27 is provided on the buffer tank sewage pipe 25 .

[0023] Working principle: During normal operation, the tank truck transports desalted water through the buffer tank and injects desalted water into the buffer tank 1 through the desalted water pipeline 4 to reach the preset liquid level. Before operation, the electric switch valve 27 on the air-cooled condenser circulating cooling water pipeline 8 and the air-cooled condenser outlet pipeline 9 is opened, and the electric switch valve 27 on the cooling water supply pump outlet pipeline 7, the circulating water pump outlet pipeline 15 and the buffer tank inlet pipeline 12 is closed. The cooling water supply pump 6 draws water from the buffer tank 1 through the buffer tank outlet pipeline 5. Take cooling water, measure the flow rate through the cooling water flow meter 26, and adjust the cooling water supply pump 6 by frequency conversion according to the set circulating cooling water demand; the water output of the cooling water supply pump 6 enters the air-cooled condenser 2 through the cooling water supply pump outlet pipe 7 and the air-cooled condenser circulating cooling water pipe 8. The condenser tube of the air-cooled condenser 2 adopts a concentric double thin-walled corrugated tube structure, which increases the heat exchange area between the air and the cooling water. The air and cooling water in the tube move in a cross-flow manner, and the air can cool the tube from both the inside and the outside. The water is cooled at the same time, which greatly improves the efficiency of the air-cooled condenser; the circulating cooling water cooled by the air-cooled condenser 2 is transported to the cooling water equipment through the air-cooled condenser outlet pipe 9 and the equipment circulating cooling water pipe 10; the circulating return water of the cooling water equipment returns to the buffer tank 1 through the buffer tank inlet pipe 11, realizing the closed circulation of cooling water; the air compressor 19 compresses the air into the air storage tank 16 through the air storage tank inlet pipe 18, and the air storage tank 16 compresses the air through the air storage tank outlet pipe 17 The air is discharged into the condenser tube of the air-cooled condenser 2 for air cooling and heat exchange, and is finally discharged through the exhaust valve 21. The amount of air discharged from the air storage tank 16 is measured by the gas flow meter 29, and the air volume is automatically adjusted by the electric control valve 30 according to the flow measured by the cooling water flow meter 26 and the temperature measured by the temperature transmitter 28; the fan 22 cools the outer wall of the condenser tube of the air-cooled condenser 2, and adjusts the speed by frequency conversion according to the flow measured by the cooling water flow meter 26 and the temperature measured by the temperature transmitter 28.

[0024] When operating under extreme working conditions, that is, when the water consumption of the water injection station is large or the water temperature is high, open the electric switch valve 27 on the cooling water supply pump outlet pipe 7, the circulating water pump outlet pipe 15 and the buffer tank inlet pipe 12 before operation, and close the electric switch valve 27 on the air-cooled condenser circulating cooling water pipe 8 and the air-cooled condenser outlet pipe 9; the cooling water supply pump 6 draws cooling water from the buffer tank 1 through the buffer tank outlet pipe 5, and the water output from the cooling water supply pump 6 is transported to the cooling water equipment through the cooling water supply pump outlet pipe 7 and the equipment circulating cooling water pipe 10, and the cooling water equipment circulates the return water The cooling water is returned to the buffer tank 1 through the buffer tank inlet pipe 11 to realize the closed circulation of cooling water; the circulating water pump 14 draws cooling water from the buffer tank 1 through the buffer tank outlet pipe 2 13, and the water discharged from the circulating water pump 14 enters the air-cooled condenser 2 through the circulating water pump outlet pipe 15 for condensation. The cooling water condensed by the air-cooled condenser 2 is returned to the buffer tank 1 through the air-cooled condenser outlet pipe 9 and the buffer tank inlet pipe 2 12, realizing the internal cooling circulation between the buffer tank 1 and the air-cooled condenser 2. Through multiple cycles of cooling, the cooling water cooling range is greatly improved to meet production needs.

[0025] During sewage discharge operation, the electric switch valve 27 on the sewage discharge pipeline 25 of the buffer tank is opened, and the sewage at the bottom of the buffer tank 1 is discharged into the recovery system through the sewage discharge pipeline 25 of the buffer tank.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and application concept of the present invention, should be covered by the protection scope of the present invention.

Claims

1. A closed cooling water device for an oilfield water injection station, comprising a buffer tank (1), an air-cooled condenser (2) and a control console (3), characterized in that: The lower end of the buffer tank (1) is connected to a buffer tank desalted water pipeline (4); the middle part of the buffer tank (1) is connected to a cooling water supply pump (6) through a buffer tank outlet pipeline (5); the cooling water supply pump (6) is connected to a cooling water supply pump outlet pipeline (7); the cooling water supply pump outlet pipeline (7) is connected to the air-cooled condenser (2) through an air-cooled condenser circulating cooling water pipeline (8); the air-cooled condenser (2) is connected to the equipment circulating cooling water pipeline (10) through an air-cooled condenser outlet pipeline (9); the upper end of the buffer tank (1) is connected to a buffer tank inlet pipeline (11); The cooling water supply pump outlet pipe (7) is connected to the equipment circulating cooling water pipe (10); the air-cooled condenser outlet pipe (9) is connected to the buffer tank (1) through the buffer tank inlet pipe 2 (12); the other side of the middle of the buffer tank (1) is connected to a circulating water pump (14) through the buffer tank outlet pipe 2 (13), and the circulating water pump (14) is connected to the air-cooled condenser (2) through the circulating water pump outlet pipe (15).

2. The closed cooling water device for an oilfield water injection station according to claim 1, characterized in that: It also includes an air storage tank (16), the top of the air storage tank (16) is connected to the air-cooled condenser (2) through an air storage tank outlet pipeline (17), and the lower end of the air storage tank (16) is connected to the air compressor (19) through an air storage tank inlet pipeline (18).

3. The closed cooling water device for an oilfield water injection station according to claim 1, characterized in that: The top of the air-cooled condenser (2) is connected to an air-cooled condenser exhaust pipeline (20), and an exhaust valve (21) is provided on the air-cooled condenser exhaust pipeline (20); and a fan (22) is provided at the bottom of the air-cooled condenser (2).

4. The closed cooling water device for an oilfield water injection station according to claim 2, characterized in that: The top of the buffer tank (1) is provided with an ultrasonic level meter (23) and a second exhaust valve (24); the bottom of the buffer tank (1) is connected to a buffer tank sewage pipeline (25).

5. The closed cooling water device for an oilfield water injection station according to claim 4, characterized in that: The buffer tank outlet pipe (5) is provided with a cooling water flow meter (26), the cooling water supply pump outlet pipe (7), the air-cooled condenser circulating cooling water pipe (8), the circulating water pump outlet pipe (15), the air-cooled condenser outlet pipe (9), the buffer tank inlet pipe (12) and the buffer tank sewage pipe (25) are all provided with electric switch valves (27), the air-cooled condenser outlet pipe (9) is also provided with a temperature transmitter (28), and the gas storage tank outlet pipe (17) is provided with a gas flow meter (29) and an electric regulating valve (30).

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