Sewage treatment method for reinjection of produced water from oil field to low-permeability oil field
A sewage treatment method and sewage technology, which are applied in the fields of osmosis/dialysis water/sewage treatment, biological water/sewage treatment, flotation water/sewage treatment, etc. problem, to achieve the effect of low operating cost and short process flow
Active Publication Date: 2012-07-25
KMD BEIJING ENERGY & ENVIRONMENT TECH CO LTD
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Problems solved by technology
Using this device for sewage treatment, the technological process is complicated and the treatment procedure is too long, so the operating cost is relatively high
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] The sewage treatment method that the oilfield production water of the present invention is reinjected into the low (ultra-low) permeability oilfield comprises the following steps:
[0024] a. Remove slick oil, dispersed oil and part of emulsified oil in sewage
[0025] The oily sewage first enters the coalescer for treatment. The coalescer is equipped with regular (orifice corrugated) packing. The material of the packing can be polyvinyl chloride, stainless steel or ceramics. The packing is formed by a number of corrugated sheets pressed into corrugations vertically. , there are small holes on the corrugated sheet. When the filler is filled in the coalescer, the channel formed by the corrugated surface of the corrugated sheet is at an angle of 45° relative to the axial direction, and the flow channels of two adjacent corrugated sheets are at an angle of 90°; oily sewage Through the wetting coalescence and collision coalescence of the structured packing, the oil droplets...
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Abstract
The invention discloses a sewage treatment method for reinjection of produced water from an oil field to a low-permeability oil field. The method comprises the following steps: a) removing oil slick, dispersed oil and part of emulsified oil in sewage; b) separating suspended matters and solid granular impurities in the sewage; c) carrying out microbial degradation on oil in the sewage, wherein a microbial strain comes from the nature and is obtained by artificial screening and domestication through the steps as follows: taking an oil-containing sandy soil sample from the oil field, taking 1g of oil-containing sandy soil sample, pouring into a conical flask containing 500mg / L oil and 100ml of distilled water, carrying out shake cultivation and domestication, domesticating for 1 month, thencarrying out purification and separation on the strain, and separating a Bacillus strain which is used for degrading the oil in the sewage; and d) carrying out nano-filtration for removing sand, bacteria, colloidal substances and viruses in the sewage. By utilizing the method for the treatment of the sewage from the oil filed, the water quality of outlet water can completely meet the requirement on the water quality of injected water in the reinjection into the low (ultra-low) permeability oil field.
Description
technical field [0001] The invention relates to a sewage treatment technology for reinjecting oilfield produced water into a low (ultra-low) permeability oilfield, and belongs to the field of oily sewage treatment. Background technique [0002] With the continuous improvement of my country's oil and gas exploration and development, the reserves and production of high-quality oil and gas fields are decreasing year by year, and the proportion of reserves and production of low-grade oil and gas fields such as low permeability is increasing year by year. primary resource. According to statistics, the proportion of low-permeability oil resources in China National Petroleum Corporation's proven reserves was 23% before 1995, 56% from 1996 to 2001, and 69% since 2001. As of the end of 2003, China's cumulative proven low-grade oil geological reserves of low-permeability oil and heavy oil were about 120×10 8 t, accounting for 50.9% of the total proven petroleum geological reserves, o...
Claims
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IPC IPC(8): C12N1/20C02F9/14C02F1/40C02F3/34C02F1/44C02F1/24C02F3/30C12R1/07
Inventor 高玉格李国文刘亚许庆民胡彦龙
Owner KMD BEIJING ENERGY & ENVIRONMENT TECH CO LTD