Oilfield Produced Water Treatment Filter Tank Air-Water Backwash Regeneration Process

Abstract

The invention relates to an oil field produced water treatment filtration tank gas-water backwash regeneration process. The process comprises a gas washing process and a water washing process. First, the filtering material in the filtration tank is subjected to gas backwash with 2 gas gradients according to a gas washing process, and the filtering material in the filtration tank is subjected to water backwash with 1 water gradient. The gas washing process sequentially adopts an air compressor, an air pressure regulation tank, a gas flow rate controlling valve set, a single-tank gas inlet switching valve, the filtration tank, a backwash water discharge valve, and a low-level recovery water tank. The water washing process sequentially adopts a backwash variable-frequency water pump, a water flow rate regulation valve set, a single-tank backwash water inlet switch valve, the filtration tank, a backwash water discharge valve, and a backwash recovery water tank. With the process, regeneration of particulate filtering materials in single-layer quartz filtration tank, single-layer magnetite filtration tank, quartz-magnetite double-layer filtering material filtration tank, glauconite-magnetite double-layer filtering material filtration tank, and the like in oil field produced water treatment processes can be effectively realized.

Description

technical field [0001] The invention relates to oilfield produced water treatment technology, in particular to an oilfield produced water treatment filter tank air-water backwash regeneration process suitable for regeneration of oilfield produced water filter tank filter material. Background technique [0002] Particle filter filter tank used in early oilfield oily sewage treatment process. The mature technical method of backwashing and regenerating the filter material of the filter tank with the filtered water has been used all the time, and this method has the advantages of simple operation process and easy management. However, as the oilfield development enters the later stage, after the oilfield adopts tertiary oil recovery methods such as chemical flooding, because the produced water contains polymers, the pollution layer formed by the granular filter material after long-term operation and filtration has the characteristics of high viscosity and strong adhesion , using...

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Problems solved by technology

However, as the oilfield development enters the later stage, after the oilfield adopts tertiary oil recovery methods such as chemical flooding, due to the polymer contained in the produced water, the pollution layer formed by the granular filter material after long-term operation and filtration has the characteristics of high viscosity and strong adhesion , using a single water backwashing regeneration method, it is difficult to wash away the dirty oil, impurities and polymers and other components trapped in the coating layer formed on the surface of the filter material, so that the filter material cannot be effectively restored, thereby reducing the filter retention performance; In addition, during the filtration process, the contaminated filter material is likely to form agglomerates and filter cake layers due to the polymer contained in the water, and it is easy to cause partial rupture of the filter cake layer during backwashing. Increasing the backwashing intensity will also easily cause gaps between the litter material and the filter material. The intermixed layer and the loss of filter material, etc., cannot completely regenerate the filter material by backwashing, which in turn affects the quality of filtered water

This shows that the method of backwashing the used oilfield mature water to regenerate the granular filter material filter has already appeared unsuitable problems.

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