Problems faced by walnut shell abrasive in oilfield wastewater treatment

Which method is adopted for oilfield development in my country

At present, most of the oilfield development in my country adopts the water injection method. In the later stage of the oil field development, it is divided into two times, and the third oil field is accompanied by a large amount of formation water. In the industrial application stage, the produced water of ternary combined flooding separates oil and water through the desorption water process. The separated water contains alkali, suspended solids, polymers, and surfactants, which make water treatment more difficult.

  Why filter the wastewater from the oil field

The comprehensive water content of oilfields in China is as high as 85%, and the annual sewage output is about 900 million m3. The oilfield stipulates that these sewage not only cannot be discharged, but also used as the main water source for water injection development of oilfields. The separated sewage is pretreated. , It must undergo advanced treatment to meet the required water quality standards before reinjection can be carried out to ensure the effect of water injection and exploitation in China’s low- and medium-permeability oilfields. Therefore, this filter bed sand filter has become the key to the advanced treatment of oil-containing and polymer-containing sewage in oilfields. .

  Insufficiency of walnut shell abrasive in oilfield wastewater treatment process

Walnut shell filter abrasive material is not cleaned, slabs and agglomeration appear, backwashing screen is blocked, material is running, and there are many dead corners of filter material in the filter tank. It always stays in the tank. When the oil stain reaches a certain thickness, operate the device for a long time The pressure will increase and the filtering capacity will decrease, causing damage to the filter tank and parts. The abrasive must be replaced, which will affect the service life and use effect of the filter.

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