Complex microorganism preparations for oil production

Abstract

The invention discloses a compound microbe agent to extract oil in the microbe bacterial composition technical domain, which is characterized by the following: blending the ferment liquid of bacillus licheniformis and dehydrocarbon blended bacterial culture medium to make the product with proportion at 1: 1. 5-9. The invention doesn't need a large amount of nourishing liquid, which has advantages of simple construction, short shut-in time, low cost, rapid effect, greatly production amplitude and long lasting time.

Description

technical field [0001] The invention relates to the technical field of a microbial bacterial composition for oil extraction. Background technique [0002] Hydrocarbon-decomposing bacteria and nutrient solution are injected into the reservoir through water injection wells (this process is called "microbial flooding") or squeezed from the oil well to the near wellbore zone (this process is called "single well huff and puff") The degradation of crude oil and the effect of its metabolites on crude oil emulsify crude oil to reduce viscosity and increase fluidity, which is a method that has been applied to increase oil production or recovery. However, according to the published literature, various microbial oil recovery methods so far are only limited to the single action of hydrocarbon-decomposing bacteria. US4,475,590 proposes a method of injecting a large amount of nutrient solution from the water injection well into the oil reservoir, the purpose is to stimulate the inherent ...

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Problems solved by technology

However, from the published literature, the various microbial oil recovery methods so far are only limited to the single action of hydrocarbon-decomposing bacteria.

US4,475,590 proposes a method of injecting a large amount of nutrient solution from the water injection well into the oil reservoir, the purpose is to stimulate the inherent microbial growth and metabolism in the oil reservoir, so as to improve the recovery; US5,163,510 discloses the injection of aerobic bacteria from the production well The method of re-injecting oxygen is to allow microorganisms to grow and metabolize better, but the construction is complicated, the cost is too high, and it is not safe; US 4,450,908 proposes a method of injecting polyacrylamide in stages from the water injection well and then injecting microorganisms; US4,905,761 is a patent about injecting microorganisms and nutrient solution into the formation from water injection wells; CN i038327 proposes to enrich microorganisms from the water produced from each oil well, and then inject the nutrient solution and microorganisms back into the oil reservoir from the original well after laboratory experiments , the disadvantage of this method is that it needs to enrich the hydrocarbon-decomposing bacteria well by well and carry out experimental evaluation, the reaction time between microorganisms and nutrient solution is long, and the well shut-in time is required to be as long as 20 days: CN1164607A discloses a method of circulating microbial flooding and recovery

Its technology consists of two aspects. On the one hand, microorganisms are injected into production wells or water injection wells. On the other hand, microorganisms that survive and multiply in the oil layer are extracted from production wells, separated from oil and water, and then the sewage containing bacteria is injected into the oil reservoir. At the same time, depending on the situation, special or the same microorganisms can be added into the water injection well together with the sewage. This method is complex in pipe network reconstruction and construction, and the cost is also high. Due to engineering technical or economic reasons, not all sewage in this system can be used. Inject back into this system; CN 1254788A discloses a kind of microbial compound flooding oil recovery method, it is the oil recovery method that injects microorganism and a set of mature non-microbial oil displacement method through water injection well and combines, for example with chemical profile control, chemical Combination of polymer flooding, foam flooding and three-element compound flooding of alkali / chemical surfactant / polymer; CN 1257154A introduces a method of oil recovery with microbial composite measures, which is to squeeze microorganisms into oil wells Oil recovery methods combined with a well-established set of non-microbial recovery measures in the near-wellbore zone, such as chemical fracturing, water shutoff and nitrogen injection, etc.

[0003] The various microbial oil recovery methods reported in the above literature are limited to the single action of hydrocarbon-decomposing bacteria. Some of these methods are quite complex in construction, some are costly and pollute the formation and the environment, and some are difficult to examine the effect of microbial oil recovery technology.

There is no literature report about the microbial oil recovery method that adds Bacillus licheniformis (Bacillus licheniFormis) x3 fermentation broth, i.e., lipopeptide surfactant fermentation broth, to the hydrocarbon-decomposing bacteria culture fluid to make a composite microbial preparation.