Process and apparatus for treating oil-gas field wastewater
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A technology for wastewater treatment and oil and gas fields, applied in water/sewage multi-stage treatment, flotation water/sewage treatment, oxidized water/sewage treatment, etc. Low power consumption, strong processing power, and flexible effects
Active Publication Date: 2009-07-15
中石化石油工程技术服务有限公司
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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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[0041] see figure 2 : This oil and gas field wastewater treatment device includes electric floating treatment device I, primary coagulation and sedimentation device II, oxidation device III, secondary coagulation and sedimentation device IV, filter device V, and adjustment and monitoring device VI arranged in sequence. The structure of each part is described as follows.
[0042] see Figure 3-1 , Figure 3-2 : the electric floating treatment device 1 comprises a power supply 1, an electrolyzer 2, and a slag overflow tank 3. In the electrolytic cell 2, a plurality of pole plates 4 are vertically dispersed and arranged. The pole plates 4 are divided into two groups, one group is the anode, and the other is the cathode. Connection, bus 5 is connected to power supply 1.
[0043] The pole plate 4 is made of ordinary carbon steel, installed in parallel on the pole plate fixing card 6 in the electrolytic cell 2, and supported by the Cao steel bracket 14; the bus bar 5 uses coppe...
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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...
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