Process and apparatus for treating oil-gas field wastewater

Abstract

The invention discloses a technology and a device for processing waste water of an oil gas filed. The technology for processing waste water comprises a preprocessing step and an advanced processing step, wherein the preprocessing step uses the method of electric floating processing and coagulation depositing processing, and the advanced processing step comprises oxidization processing, second-stage coagulation depositing processing, filtration and quality regulating processing. The device for processing waste water comprises a preprocessor and an advanced processor which are orderly arranged, and the preprocessor comprises an electric floating processor and a first-stage coagulation depositor which are orderly arranged. The invention has the advantages that the waste water processing effect is good, under the normal condition, the out-water index after the processing of the waste water from oil (gas) exploration can reach the first-grade standard of GB 8978-1996, and the out-water index after the processing of the waste water from well drilling and repair and underground work can reach the second-grade standard of GB8978-1996. The device for processing waste water has strong processing performance, low energy consumption and high automatic degree, and in the normal running condition of the whole device, only two people are required for cooperation and operation.

Description

technical field [0001] The invention relates to wastewater treatment technology, in particular to an oil and gas field wastewater treatment process and device. Background technique [0002] Oil and gas field wastewater is mainly composed of oil and gas field produced water, well washing wastewater, drilling wastewater, and downhole operation wastewater. Contains petroleum, SS, demulsifier, drilling fluid additives, soluble minerals, polymer treatment agent, organic matter, residual acid, alkali, heavy metal ions, etc., the composition is complex, generally with high COD, high petroleum, high SS, high mineral It has high pollution load, strong environmental hazards, and difficult treatment. [0003] Oil and gas field wastewater treatment process includes two steps, namely wastewater pretreatment and advanced treatment. [0004] At present, the pretreatment of oil and gas field wastewater is usually carried out by chemical demulsification, oil separation, (dissolved air) air...

AI Technical Summary

Problems solved by technology

Although some mobile oil and gas field wastewater treatment equipment have appeared in recent years, their technology is relatively backward, and most of them use different combinations of unit processes such as chemical stabilization, coagulation, air flotation, sedimentation, and filtration to achieve different treatment requirements and purposes. There are disadvantages such as poor treatment effect, difficulty in reaching the standard, small treatment capacity, unstable operation, low degree of automation, and high treatment cost, making it difficult to popularize and use it on a large scale

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