Three separation methods of liquid-gas separator
Release time: 2015/10/28 Ai Yi NewsViews : 1532
Horizontal and vertical liquid-gas separators have three oil-water interface control methods with the same principle.
The first method uses an interface float to control the opening of the drainage method to keep the oil-water interface within a certain height range. Because the liquid-gas separator is provided with a partition plate, the effective volume of the container is large, the manufacturing is simple, and the sand and sludge stored in the container are easy to remove. Disadvantages are: if the water level controller or the drain valve fails, crude oil may enter the drainage line; if the oil level drops, gas may enter the oil outlet line, for this reason, a T-shaped inlet can be installed at the end of the oil outlet pipe; Thick crude oil emulsion, it is difficult to control the oil-water interface; in addition, crude oil foaming will affect the indicated value of the gas-liquid interface measurement.
The second control method is to control the gas-liquid interface with an oil weir. All crude oil must be raised to the height of the oil weir before being discharged from the container, so the quality of the crude oil flowing out of the separator is better. The disadvantage is that the oil chamber occupies a certain volume, which reduces the effective volume of the oil-water separator of the separator and affects the separation effect. Due to the existence of the oil chamber and the partition, not only the manufacturing cost increases, but it is also difficult to remove the sand and sludge in the container and oil chamber. One control method is the same. The oil-water interface is controlled by weighted floats, which is not suitable for the working conditions where an emulsion exists between the oil and water.
The third control method is to set oil weirs and water weirs in the liquid-gas separator container to control the liquid level entering the oil and water chambers. Use the gas-liquid interface floats in the oil and water chambers to control their respective discharge valves. The liquid density is large, and the float can effectively control the oil level and water level. The biggest advantage of this method is that it does not affect the normal operation of the separator when there is an emulsified oil layer between the oil and water of the liquid-gas separator. The fluid on both sides of the oil chamber constitutes a connector. The height of the oil weir determines the position of the oil-gas interface, and the height difference between the oil weir and the water weir determines the position of the oil-water interface. It can be seen that when the instantaneous flow of crude oil increases, the oil film across the oil weir thickens, the height difference of the oil-water weir plate increases, and the height of the oil layer increases. The oil chamber should have sufficient depth to prevent crude oil from flowing into the oil chamber through the lower part of the oil chamber. The right side flows into the water chamber. In contrast, when the instantaneous water flow increases, the oil layer becomes thinner, and more crude oil flows from the oil layer into the oil chamber. To reduce such fluctuations, oil weirs and water weirs should have sufficient width and levelness. In oilfield production practice, the second and third control methods are widely used. The second control method can be used when the oil-water density difference is large, easy to layer, and the oil-water interface is clear. Otherwise, the third control method is used.