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Oilfield produced water treatment process for removing oil by using oil-degrading flora

A treatment process and technology for produced water, applied in mining wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of difficult sewage treatment, frequent backwashing, and expensive replacement of filter materials in oil production enterprises

Inactive Publication Date: 2021-02-19
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several defects in this method: (1), a large amount of chemicals such as flocculants, corrosion inhibitors, and fungicides need to be added; (2), the filtration system has a large load, frequent backwashing, and the water quality is unstable; (3), the replacement of filter materials The price is expensive; it brings great difficulties to the sewage treatment of oil production enterprises

Method used

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  • Oilfield produced water treatment process for removing oil by using oil-degrading flora

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Taking the produced water of an oil field, using the crude oil produced as the only carbon source, the oil-loving bacteria group that spontaneously grew in the polluted soil was collected, and through multiple rounds of screening, purification and enrichment culture, the oil-degrading bacteria, that is, the oil-loving bacteria, were isolated. Bacillus licheniformis, Brevibacillus, and Pseudoxanthomonas were compounded into a biological agent at a ratio of 2:1:1, and put into the microbial pool for cultivation.

[0018] The oil content in the effluent water of the three-phase separator in an oil field is 100.5 mg / l, the median particle size is 8.6, the sulfur content is 6.4 mg / l, the iron content is 0.35, and the solid content is 128.7 mg / l.

[0019] Using this treatment process for treatment, it first enters the sedimentation tank, and the effluent enters the microbial tank. The sulfide is removed by the large-flow cyclone aerator at the front end of the microbial tank, ...

Embodiment 2

[0030] The same treatment process as in Example 1 was used to treat the produced water from another oilfield, and the process conditions were the same as in Example 1. The analysis results of the effluent water quality of each process section are shown in Table 5.

[0031] Table 5 Analysis results of effluent water quality in each process section

[0032] project Three-phase separator outlet Settling tank outlet Microbiological pool outlet Membrane outlet Solid mg / l 167.3 75.4 12.1 1.96 median particle size 5.1 4.1 3.5 1.12 Oil mg / l 88.5 56.2 0.0 0.0 Sulfur mg / l 3.4 3.2 0.1 0.0 Iron mg / l 0.2 0.2 0.1 0.0

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Abstract

The invention discloses an oilfield produced water treatment process for removing oil by using oil-degrading flora. The process comprises the following steps: S1, extracting three-phase separator produced water of an oilfield, inputting the produced water into a settling tank, and standing for 8-12 hours to settle large-particle impurities in sewage; S2, adding a biological agent into a microbialpool, wherein the biological agent comprises bacillus licheniformis, brevibacillus and pseudoxanthomonas, and the compounding ratio is 2:1:1; S3, introducing the effluent of the microbial pool into aninclined plate sedimentation pool; and S4, enabling the effluent to enter a membrane filter, so that the effluent reaches the oilfield flooding water quality standard. According to the invention, sulfide is removed by utilizing a high-ventilation-rate rotary mixing aerator at the front end of a microbial pool, emulsified oil and floating oil in sewage are decomposed by utilizing oil-degrading bacteria, then the sewage enters an inclined plate sedimentation pool to separate suspended dirt in the water, finally the sewage enters a hollow fiber ultrafiltration membrane, and effluent after passing through a membrane filter can meet the requirements of Water quality standard and practice for analysis of oilfield injecting waters in clastic reservoirs (SYT 5329-2012) II.

Description

technical field [0001] The invention relates to a water treatment process, more precisely, an oilfield produced water treatment process using oleophilic bacteria to remove oil. Background technique [0002] With the in-depth development of the oil field, the oil field has entered the middle and late stage of production, and the water content is generally around 90% or even as high as 95% in some areas; the late stage of oil field production mainly uses artificial water injection to maintain formation pressure. Therefore, it is an essential procedure for oilfield production to treat the produced water and inject it back into the produced oil layer. [0003] Oilfield produced water has the characteristics of high oil content, high organic matter and high sulfide, etc., and its waste water is large in volume and complex in composition, making it difficult to treat. At present, the common practice in various oilfields is to add a filter device for advanced treatment after simpl...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/10C02F101/30C02F101/10
CPCC02F9/00C02F1/52C02F3/34C02F1/444C02F2103/10C02F2101/30C02F2101/101C02F2303/22C02F2303/08C02F2301/08
Inventor 许国晨宗国红林刚王波卓龙成石凯吕海威田佳陈皓许辉
Owner CHINA PETROLEUM & CHEM CORP
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