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Method of treating highly scaling oil and gas field produced water with microorganisms assisted by modified clay

A technology for microbial treatment and produced water, which is used in biological water/sewage treatment, water/sewage treatment, mining wastewater treatment, etc. Efficient degradation of organic matter and other problems, to avoid the degradation of the degradation rate, optimize the descaling process link, and complete the adsorption effect.

Pending Publication Date: 2017-08-11
XI'AN PETROLEUM UNIVERSITY
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  • Description
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Problems solved by technology

For example, multi-layer oil recovery wastewater with poor compatibility will scale due to the reaction between ions after mixing. Sewage scaling will affect the material and energy exchange between microorganisms and the outside world, and inhibit the microorganisms in the biological treatment system, resulting in microbial sewage treatment. Process efficiency drops or even paralyzes
[0005] Therefore, in the process of microbial treatment of oil production sewage, it is necessary to solve the problem of poor stability of the microbial treatment process due to high scaling of oil production sewage, which leads to the deposition of scale on the surface of microorganisms, or even paralysis, so as not to affect the microorganisms on the organic matter in sewage. Efficient degradation

Method used

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  • Method of treating highly scaling oil and gas field produced water with microorganisms assisted by modified clay

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Embodiment 1

[0038]The oily sewage treatment process of Wuqi Oil Production Plant in Yanchang Oilfield is as follows: incoming water - natural degreasing - air flotation - biochemical pool - filtration - effluent, and the fouling amount of sewage at the entrance of the biochemical pool is 180-260mg / L, the oil content is 10-15mg / L, the suspended matter content is 5-10mg / L, when the operation is normal, the scaling amount at the outlet of the biochemical pool is 30-50mg / L, the oil content is ≤1mg / L, and the suspended matter content is 5 -10mg / L, the effluent after filtration meets the water quality requirements for reinjection water. However, within three months of operation, the scale deposited on the surface of the microbial particles in the biochemical tank caused the breakdown of the microbial treatment system, and the filter material of the filtration system was severely fouled, and the scale type was mainly calcium carbonate. According to the measurement, the fouling amount at the out...

Embodiment 2

[0041] The produced water of Xingzichuan Chang 2 formation in Yanchang Oilfield has a calcium ion content of Sulfate ion content The calcium ion content in the produced water of the Chang 6 formation is Sulfate ion content The produced water from the Chang 2 layer and the Chang 6 layer were mixed at a ratio of 9:1, and the scaling amount in 72 hours was 4478.25 mg / L. Pseudomonas was used to treat the mixed water sample, the amount of crude oil added was 4%, the amount of bacteria added was 2%, the stirring speed was 200r / min, the temperature was 37°C, the pH value was 7.5, and the degradation time was 7 days. The coalescence and deposition on the surface of the bacteria resulted in the blockage of the exchange of substances and energy between Pseudomonas and the outside world, and the degradation rate of crude oil changed from blank (simulated water: replace calcium ions with the same content of sodium ions in the long 2 and long 6 layers of water, and the rest ion co...

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Abstract

The invention discloses a method of treating highly scaling oil and gas field produced water with microorganisms assisted by modified clay. The method includes the steps that after the highly scaling oil and gas field produced water and modified clay of certain concentration are premixed for certain time in a mixing pond, under the adsorption action of polysaccharides substances and protein on the surface of the modified clay, scale substances such as calcium sulfate and calcium carbonate in the highly scaling produced water are deposited on the surface of the modified clay; the produced water in the mixing pond is guided into a microbial reaction pond, and the sewage is treated through the degradation effect of organic substances in the water; the produced water from the microbial reaction pond is filtered and reinjected to an oil reservoir. The method effectively promotes deposition of scale on the surfaces of modified clay particles, then deposition of the scale on the microorganism surface is reduced, stable operation of the process of treating the highly scaling oil recovery sewage through the microbiological method is ensured, efficient degradation of the oil recovery sewage by the microorganisms is promoted, and technical support and feasible programs are provided to remove highly scaling oil recovery sewage scale and eliminate influence on the efficiency of treating the highly scaling oil recovery sewage through the microbiological method due to deposition on the surfaces of the microorganisms.

Description

technical field [0001] The invention belongs to the technical field of treatment and reuse of produced water in oil and gas fields, and in particular relates to a method for treating produced water in high-scaling oil and gas fields with modified clay assisting microorganisms. Background technique [0002] At present, the development of my country's oil and gas fields has entered the stage of water injection development. The water content of the produced fluid in the production well is as high as 80%, and the production of the oil field requires a large amount of water as injection water. The treated produced water is the best source of injection water. . Usually, oilfield produced water has high salinity (mostly between 20000-120000mg / L, some even as high as 290000mg / L), Ca 2+ and SO 4 2- The ion content is high, and the sewage often contains a certain amount of HCO 3 - , CO 3 2- , so sewage scaling is a common phenomenon, and some are even strong scaling water. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F9/00C02F2103/10C02F3/34C02F3/1226C02F1/56C02F1/66C02F1/5236C02F1/288
Inventor 屈撑囤鱼涛张欢谢娟
Owner XI'AN PETROLEUM UNIVERSITY
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