Device with dual dosing function for gas storage well station

Abstract

The invention relates to a device with a dual dosing function for a gas storage well station, and belongs to the technical field of gas storage ground engineering. Comprising a storage tank and a separation partition plate, the separation partition plate is fixed in the storage tank and divides the storage tank into two cavities, namely a methanol cavity and a corrosion inhibitor cavity, and a gap exists between the top end of the separation partition plate and the inner wall of the top of the storage tank; a methanol inlet pipe and a methanol outlet pipe are arranged on the side, where the methanol cavity is located, of the tank body; a corrosion inhibitor inlet pipe and a corrosion inhibitor outlet pipe are arranged on the side, where the corrosion inhibitor cavity is located, of the tank body; the tank body is further provided with a nitrogen inlet, and the two cavities are subjected to nitrogen sealing through nitrogen. The separating partition plate is arranged in the tank body, and nitrogen sealing is carried out through nitrogen, so that one storage tank can contain two media; the safety is ensured by arranging a plurality of liquid level sensors; the engineering floor area is saved, the engineering investment is reduced, the field operation management workload is reduced, and the safety risk is reduced.

Description

Technical Field

[0001] The present invention relates to a device for dual chemical addition function in gas storage well stations, belonging to the technical field of gas storage surface engineering. Background Art

[0002] In recent years, there has been a shortage of natural gas supply on a large scale across the country, fully exposing the shortcoming of insufficient gas storage capacity. To alleviate the "gas shortage" problem, on September 28, 2017, the state proposed that by 2020, the gas storage capacity of major gas supply enterprises should reach 10% of the contract gas supply volume, and each region should reach the gas storage capacity of an average of three days' gas consumption. Major gas supply enterprises should maximize the existing natural gas storage and peak shaving capacity, accelerate project construction, and ensure stable natural gas supply in winter.

[0003] China's gas storage and peak shaving capacity is seriously insufficient, only accounting for 4% of the national natural gas consumption, far lower than the level of 17 - 36% in mature markets in Europe and America. The seasonal characteristics of natural gas consumption are obvious, and the average peak-valley difference between winter and summer across the country is relatively large, which has a certain impact on upstream production and downstream sales. Accelerating the construction of natural gas storage facilities is an important guarantee for national energy strategic security.

[0004] In the initial stage of opening the injection-production wells in the gas storage facility, the formation temperature field cannot be established quickly, resulting in a relatively low temperature of the well fluid, which is likely to cause freezing and blockage of the pipeline. It is necessary to set up a methanol injection device at the wellhead to prevent freezing and blockage. Considering avoiding pipeline freezing and blockage, a methanol injection device is also set up in the wet gas pipeline in the gathering and injection station.

[0005] The produced gas at the wellhead has a high CO 2 content. To reduce the internal corrosion of the pipeline during the gas production period, an inhibitor device is set up at the well site and in the gathering and injection station to inject the inhibitor for internal corrosion protection.

[0006] Currently, a methanol injection device and an inhibitor injection device are usually set up separately in the injection-production well site and the gathering and injection station. Such a deployment will inevitably lead to an increase in project investment, an increase in floor area, a high operating pressure, an increase in on-site operation and management workload, and an increase in safety risks. Summary of the Invention

[0007] The present invention discloses a device for dual chemical addition function in gas storage well stations, aiming to solve the process of setting up a methanol injection device and an inhibitor injection device independently in the gas storage well site and the gathering and injection station, realizing that one set of device has a dual chemical addition function, saving the project floor area, reducing project investment, reducing the on-site operation and management workload, and eliminating safety risks.

[0008] The technical solution adopted by the present invention is a device for the dual chemical dosing function of a gas storage well station, which includes a storage tank and a separation partition. The separation partition is fixed inside the storage tank to divide the storage tank into two cavities, namely a methanol cavity and an inhibitor cavity. There is a gap between the top end of the separation partition and the inner wall of the top of the storage tank. The tank body on the side where the methanol cavity is located is provided with a methanol inlet pipe and a methanol outlet pipe. The tank body on the side where the inhibitor cavity is located is provided with an inhibitor inlet pipe and an inhibitor outlet pipe. The tank body is also provided with a nitrogen inlet, and nitrogen is used to perform nitrogen sealing on the two cavities.

[0009] Further, a manhole cover A is provided on the top of the storage tank. The separation partition is provided with a passage hole for personnel to pass through, and a manhole cover B for sealing the passage hole is also installed on the separation partition.

[0010] Further, the bottom parts of the tank bodies of the two cavities are respectively provided with a first sewage discharge port and a second sewage discharge port.

[0011] Further, a pressure relief valve and a pressure gauge are installed on the tank body.

[0012] Further, high-level sensors and low-level sensors are respectively provided on the tank bodies of the two cavities.

[0013] Further, a warning level sensor is also provided between the high-level sensor and the low-level sensor.

[0014] Further, the high-level sensor, the low-level sensor, and the warning level sensor are all electrically connected to a PLC controller, and the PLC controller is electrically connected to an alarm.

[0015] Further, the outer surfaces of the storage tank and the separation partition are coated with anti-corrosion paint.

[0016] Further, a support frame is also provided at the bottom of the storage tank, and the other end of the support frame is fixed on a steel plate.

[0017] The present invention discloses a device for the dual chemical dosing function of a gas storage well station. The beneficial effects are as follows: by providing a separation partition inside the tank and performing nitrogen sealing with nitrogen, one storage tank can hold two media; by setting multiple level sensors, safety is ensured; the project floor area is saved, the project investment is reduced, the on-site operation and management workload is decreased, and the safety risk is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It shows the structural schematic diagram in Embodiment 1;

[0020] Figure 2 It shows the application state schematic diagram in Embodiment 1.

[0021] Explanation of the numbers in the figure: 1. Pressure relief valve; 2. Nitrogen inlet; 3. Pressure gauge; 4. Methanol inlet pipe; 5. Corrosion inhibitor inlet pipe; 6. Manhole cover A; 7. High liquid level sensor; 8. Second sewage outlet; 9. Early warning liquid level sensor; 10. First sewage outlet; 11. Methanol outlet pipe; 12. Low liquid level sensor; 13. Corrosion inhibitor outlet pipe; 14. Separation partition; 15. Storage tank; 16. Manhole cover B; 17. Support frame. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] To further understand the content of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0024] Embodiment 1:

[0025] As Figure 1 shown, this embodiment provides a device for the dual chemical dosing function of a gas storage well station, including a storage tank 15 and a separation partition 14. The separation partition 14 is fixed inside the storage tank 15 to divide the storage tank 15 into two cavities, namely a methanol cavity and a corrosion inhibitor cavity. And there is a certain distance between the top end of the separation partition 14 and the inner wall of the top of the storage tank 15; on the side of the tank where the methanol cavity is located, there are a methanol inlet pipe 4, a methanol outlet pipe 11, and a first sewage outlet 10; on the side of the tank where the corrosion inhibitor cavity is located, there are a corrosion inhibitor inlet pipe 5, a corrosion inhibitor outlet pipe 13, and a second sewage outlet 8; there is also a nitrogen inlet 2 on the tank body; after injecting nitrogen, the nitrogen will perform nitrogen sealing in the reserved space between the separation partition 14 and the storage tank 15, separating the methanol and the corrosion inhibitor and storing them in the corresponding chambers respectively, reducing the volatilization of the methanol and the corrosion inhibitor; a pressure relief valve 1 and a pressure gauge 3 are installed on the tank body, and the pressure gauge 3 is used to measure the pressure inside the tank. When the pressure is too high, the pressure is relieved by opening the pressure relief valve 1.

[0026] The storage tank 15 is provided with a manhole cover A6 at the top of the tank. The separation partition 14 is provided with a passage hole for personnel to pass through, and a manhole cover B16 for sealing the passage hole is also installed on the separation partition 14. The manhole cover A6 and the manhole cover B16 are respectively installed on the storage tank 15 and the separation partition 14 through the cooperation of bolts, nuts and gaskets. When maintenance is required, the maintenance personnel enter the tank through the manhole cover A6. When maintenance and inspection of the methanol chamber are required, the manhole cover B16 is opened to enter for maintenance; after the maintenance is completed, the manhole cover B16 and the manhole cover A6 are closed.

[0027] On the side of the tank where the methanol chamber is located, the tank is provided with a high liquid level sensor 7, a low liquid level sensor 12, and a warning liquid level sensor 9. The warning liquid level sensor 9 is located between the high liquid level sensor 7 and the low liquid level sensor 12. On the side of the tank where the corrosion inhibitor chamber is located, the tank is also provided with a high liquid level sensor 7, a low liquid level sensor 12, and a warning liquid level sensor 9. The warning liquid level sensor 9 is located between the high liquid level sensor 7 and the low liquid level sensor 12. Each liquid level sensor on the two chambers corresponds to the same height respectively; the high liquid level sensor 7, the low liquid level sensor 12 and the warning liquid level sensor 9 are all electrically connected to the PLC controller, and the PLC controller is electrically connected to the alarm. The high liquid level sensor 7 is used to detect the highest liquid level height of the storage medium in the tank; the low liquid level sensor 12 is used to detect the lowest liquid level height of the storage medium in the tank; when the liquid level reaches the warning liquid level, the warning liquid level sensor 9 will transmit a signal to the PLC controller, and the PLC controller controls the alarm to give an alarm. After the on-site personnel hear the alarm signal, the corresponding medium will be filled into the tank to avoid safety problems caused by the liquid level reaching the lowest liquid level height.

[0028] As Figure 2 shown, in practical applications, the bottom of the storage tank 15 is also provided with a support frame 17, and the other end of the support frame 17 is fixed on a steel plate or a concrete slab. The methanol outlet pipe 11 and the corrosion inhibitor outlet pipe 13 are respectively connected to the methanol injection pump and the corrosion inhibitor injection pump in a communicating manner; the simultaneous and uninterrupted injection of two kinds of drugs, methanol and corrosion inhibitor, can be realized, ensuring the smooth flow of the process. Compared with the conventional separate dosing device, this device effectively combines the dosing devices into one. It is integrally skid-mounted, which is convenient for overall transportation. It has strong practicability, effectively reduces the floor area by 50%, reduces the investment by 50%, reduces the on-site operation and management workload of high-pressure well stations, and reduces the safety risk.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for the dual chemical dosing function of a gas storage reservoir well station, characterized in that, it includes a storage tank (15) and a separation partition (14). The separation partition (14) is fixed inside the storage tank (15) to divide the storage tank (15) into two cavities, namely a methanol cavity and an inhibitor cavity. There is a gap between the top end of the separation partition (14) and the inner wall of the top of the storage tank (15). The tank body on the side where the methanol cavity is located is provided with a methanol inlet pipe (4) and a methanol outlet pipe (11); the tank body on the side where the inhibitor cavity is located is provided with an inhibitor inlet pipe (5) and an inhibitor outlet pipe (13); a nitrogen inlet (2) is also provided on the tank body, and the two cavities are nitrogen sealed through nitrogen.

2. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 1, characterized in that, a manhole cover A (6) is provided on the top of the storage tank (15). The separation partition (14) is provided with a passage hole for personnel to pass through, and a manhole cover B (16) for sealing the passage hole is also installed on the separation partition (14).

3. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 1, characterized in that, the bottom parts of the tank bodies of the two cavities are respectively provided with a first sewage outlet (10) and a second sewage outlet (8).

4. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 1, characterized in that, a pressure relief valve (1) and a pressure gauge (3) are installed on the tank body.

5. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 1, characterized in that, high liquid level sensors (7) and low liquid level sensors (12) are respectively provided on the tank bodies of the two cavities.

6. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 5, characterized in that, an early warning liquid level sensor (9) is also provided between the high liquid level sensor (7) and the low liquid level sensor (12).

7. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 6, characterized in that, the high liquid level sensor (7), the low liquid level sensor (12) and the early warning liquid level sensor (9) are all electrically connected to a PLC controller, and the PLC controller is electrically connected to an alarm.

8. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 1, characterized in that, the storage tank (15) and the separation partition (14) are coated with anti-corrosion paint.

9. The device for the dual chemical dosing function of a gas storage reservoir well station according to claim 1, characterized in that, a support frame (17) is also provided at the bottom of the storage tank (15), and the other end of the support frame (17) is fixed on a steel plate.

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