Method for improving steam stimulation effect of microorganism single well

Abstract

The invention discloses a method for improving the steam stimulation effect of a microorganism single well and belongs to the technical field of microorganism oil recovery. The method for improving the steam stimulation effect of the microorganism single well is characterized in that the method comprises the following steps that 1, a test oil well is selected; 2, the oxygen demand of functional microorganisms is determined; 3, the functional microorganisms, activating agents and oxygen are injected in the site; 4, follow-up air is injected in the site; 5, the test oil well is shut down; and 6, the test oil well is started up for production. According to the method for improving the steam stimulation effect of the microorganism single well, not only is aerobic microorganisms in the immediate vicinity of the oil well activated through the injected oxygen, but also growth and metabolism of the functional microorganisms are activated; meanwhile, the impact scope of the functional microorganisms is expanded in a follow-up air mode, and the site test effect is further improved. The method for improving the steam stimulation effect of the microorganism single well has the characteristics that the method is wide in application range and suitable for both a thickened oil well and a wax-bearing oil well, high in pertinence and operability and long in validity period; the field conducted process is simple, the site test effect is obvious, and safety and environmental protection are achieved; therefore, the method can be widely applied to site testing of microorganism single well huff and puff.

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