A method for improving the huff and puff effect of microbial single well

Abstract

The invention discloses a method for improving the huff and puff effect of a microbial single well, which belongs to the technical field of microbial oil recovery, and is characterized in that it comprises the following steps: (1) selection of test oil wells; (2) determination of the oxygen demand of functional microorganisms; (3) On-site injection of functional microorganisms, activators and oxygen; (4) On-site injection of follow-up air; (5) Shut-in of the test oil well; (6) Opening of the test oil well for production. The invention utilizes the injected oxygen to not only activate the aerobic microorganisms in the near-well zone of the oil well, but also activate the growth and metabolism of the functional microorganisms, expand the affected range of the functional microorganisms through subsequent air, and further improve the effect of the field test. The invention has a wide range of applications. The invention is not only suitable for heavy oil wells, but also suitable for waxy oil wells; it is pertinent, strong in operability and long in validity; the field implementation process is simple, the field test effect is remarkable, and it is safe and environmentally friendly. Therefore, it can be widely used in the field test of microorganism single well throughput.

Description

technical field [0001] The invention relates to a method for microbial oil recovery, in particular to a method for improving the huff and puff effect of a single microbial well. Background technique [0002] Microbial single-well huff and puff production technology refers to the injection of functional microorganisms and activators into oil wells, using microorganisms to multiply at the oil-water interface under reservoir conditions to produce surface active substances and biogas, thereby increasing the mobility of crude oil and changing the wetness of rock surfaces. Wetness is a technology to peel off the oil film from the rock surface, dredge the seepage channel, and displace the residual oil to increase the production of a single well. However, due to the closed environment of the reservoir, the effective time and range of action of aerobic and facultative anaerobic microorganisms are limited. The traditional single-well huff and puff treatment method is to inject microor...

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Problems solved by technology

[0003] After patent retrieval, the patent number is "CN101131080A", and the patent name is "microbial single well huff and puff oil recovery method". It introduces a strain that uses petroleum hydrocarbons as the only carbon source to grow. After ground fermentation and cultivation, and according to the current situation of the ground process, The single well huff and puff method of centralized injection by cement trucks is used, but the disadvantages of this method are: (1) After the fermentation bacteria are injected into the reservoir, the growth and metabolism of the bacteria are affected by the reservoir conditions such as reservoir temperature, oxygen, and salinity. Therefore, it will inevitably affect the effective action of microorganisms; (2) Although the fermented strains have been propelled and diffused by the subsequent displacement fluid after injection, compared with the actual oil reservoir, the action range is still limited, which affects the action range of microorganisms, It is not conducive to the large-scale action of microorganisms; (3) the displacement liquid used is generally clear water or oil field injection water, which is a continuous dilution process for the fermentation liquid, thus affecting the effective metabolism of microorganisms; (4) the above method is only for microorganisms. The treatment of a single well gives a relatively general operation method, and does not provide a more effective and feasible method to improve oil well treatment according to the characteristics of the reservoir