Skid-mounted treatment device and method for oilfield sewage

Abstract

The invention discloses a skid-mounted treatment device and method for oilfield sewage. The skid-mounted treatment device comprises a sewage pretreatment system and a sewage treatment system. The sewage pretreatment system comprises a sewage tank. The sewage tank comprises an oil-water separation zone, a water inlet zone and a sewage neutralization zone, wherein sewage in the water inlet zone enters the oil-water separation zone through a sewage diversion trough; and sewage de-oiled by a floating oil-receiving device in the oil-water separation zone enters the sewage neutralization zone through a liquid level controller. The sewage treatment system comprises a hydrocyclone, a microfiltration device and an ultrafiltration device, wherein the outlet of the hydrocyclone is connected with theinlet of the microfiltration device, and the outlet of the microfiltration device is connected with the inlet of the ultrafiltration device. The treatment method comprises sewage pretreatment and sewage treatment. The invention has the following beneficial effects: grading treatment is adopted, so good effect is obtained; the entire structure is an integrated skid-mounted structure, so use requirements under the condition of no on-site sewage treatment station are satisfied; and the whole treatment device is low in sewage treatment cost, does not need civil engineering and has high efficiency.

Description

technical field [0001] The invention relates to the field of oilfield sewage treatment, in particular to a skid-mounted oilfield sewage treatment device and method. Background technique [0002] Petroleum is one of the main objects of geological exploration. It is a viscous, dark brown liquid called "industrial blood". There are oil reserves in some areas of the upper crust, and its main components are various alkanes, cycloalkanes, and aromatic hydrocarbons. mixture. The status of oil is very important, so the oil extraction industry is extremely critical. [0003] After the oil field is put into development, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in the pressure of the oil layer, a large amount of degassing of underground crude oil, an increase in viscosity, and a significant reduction in oil well production. In order to maintain or increase the oil layer pressure and obtain a higher recovery rate, it is necessary...

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Problems solved by technology

In order to maintain or increase the oil layer pressure and obtain a higher recovery rate, it is necessary to inject water into the oil field, and use the water produced in the oil field as the injection water, which can not only solve the source of the injected water, but also avoid the environment caused by the discharge of the produced water. At the same time, the compatibility of produced water and formation is good, but the separation of oilfield sewage is a major problem at present; secondly, in the early stage of oilfield development, especially in the development of remote and scattered oilfields, a large number of oilfields are produced during drilling and oil testing. Sewage, because there is no joint sewage treatment station, the sewage produced cannot be effectively treated, and it is directly injected back into the ground, seriously polluting the formation

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