Skid-mounted type automatic draining device used for evacuation and liquid separation

Abstract

The invention belongs to the technical field of oil and gas field evacuation and liquid separation and particularly relates to a skid-mounted type automatic draining device used for evacuation and liquid separation. The device comprises a gas-liquid separator, a skid seat is arranged below the gas-liquid separator, a sewage draining port at the bottom of the gas-liquid separator is connected with a reciprocation pump arranged on the skid seat through a sewage pipeline, a liquid level monitor is arranged on the gas-liquid separator, the liquid level monitor is connected with the input end of a PLC arranged on the skid seat, and the reciprocation pump is connected with the output end of the PLC. By means of the device, the gas-liquid separation of the natural gas, the automatic draining, the pressure boosting and water conveying can be achieved, the slug flow is prevented, the separation is thorough, and the problem that a sewage tank is prone to being fractured on account of pressure bearing due to the fact that the natural gas is conveyed to the sewage tank through the sewage pipeline is solved; the skid mounting and conveying are facilitated, meanwhile, the labor intensity is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of venting and liquid separation in oil and gas fields, and in particular relates to a skid-mounted automatic liquid discharge device for venting and liquid separation. Background technique [0002] Some liquid separation devices with gas-liquid separation function are widely used in oil and natural gas gathering and transportation production, as well as in oil, petrochemical, and combustible gas processing, to effectively separate impurities such as condensate oil, water, and solid particles. Reduce environmental pollution and ensure the safety of the plant and operators. [0003] At present, the separation device installed in the gas gathering station can only perform gas-liquid separation, and the drain valve needs to be manually opened or closed. The discharged liquid is discharged into the sewage tank, and then transported to the sewage treatment plant by sewage truck. With the production of the well si...

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Problems solved by technology

[0003] At present, the separation device installed in the gas gathering station can only perform gas-liquid separation, and the drain valve needs to be manually opened or closed. The discharged liquid is discharged into the sewage tank, and then transported to the sewage treatment plant by sewage truck. With the production of the well site, the liquid containing The volume will become larger and larger, which will lead to the following problems: During the multi-well production process of the gas gathering station, it is necessary to vent due to equipment failure, pipeline blockage, etc. Slug flow, resulting in insufficient separation of natural gas in the separation device, resulting in the following problems in the current gas gathering station:

[0004] 1. The liquid carried by the natural gas when it is vented or the incomplete combustion of the torch not only pollutes the environment, but also easily forms a "fire rain" that causes a greater safety hazard; There are many impurities, which will frequently cause the torch to go out suddenly;

[0005] 2. The liquid storage capacity of the vent liquid separation device is limited. If the valve on the liquid discharge line is opened in advance, the gas will be discharged through the liquid discharge line, forming a safety hazard. If the opening is delayed, there will be too much liquid stored in the vent liquid separation device, which will affect Separation effect, even the impurities from the separated liquid are brought out of the torch again, forming a fire rain;

[0006] 3. There is fluid accumulation in front of the drainage pipeline and the valve, which is easy to freeze and block in winter, resulting in poor drainage or even no drainage;

[0007] 4. The produced water separated by separators, compressors and other process equipment in the station is not completely separated in the separation tank, causing natural gas to pass through the drainage pipeline to the sewage tank, which may easily cause the sewage tank to be under pressure and cause rupture;

[0008] 5. Due to the appearance of slug flow, the liquid level exceeds the set liquid level of the liquid level alarm device. Because the valve needs to be opened manually, the efficiency is slow, and it is easy to cause insufficient volume in the liquid separation device, and the gas and liquid cannot be completely separated. At the same time, it is frequently opened or close the valve resulting in increased workload

At present, sewage trucks are used to pull sewage to the treatment plant for treatment, which requires heavy workload and high cost

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