Method for increasing biological gasification rate of oil reservoir residual oil and application of method

Abstract

The invention relates to a method for increasing the biological gasification rate of oil reservoir residual oil. The method includes the following steps that firstly, an electrode is constructed in an oil reservoir; secondly, an aqueous solution of an anaerobic microbial activator is injected into the oil reservoir; thirdly, a micro-electric field is formed in the oil reservoir by applying voltage to the electrode so as to stimulate proliferation and metabolism of methanogens and syntrophism metabolic bacteria of the methanogens; fourthly, application of the voltage stops, a water-containing liquid is injected into the oil reservoir, and the methanogens and the syntrophism metabolic bacteria are displaced to the deep part of a stratum; fifthly, a well is opened to produce methane. The invention further relates to application of the method.

Description

technical field [0001] The invention relates to a method for increasing the rate, in particular to a method for increasing the rate in the oil reservoir field. The invention also relates to its use. Background technique [0002] With the rapid development of my country's national economy and the adjustment of energy structure, my country's energy demand is increasingly strong, and the contradiction between supply and demand is increasingly intensified: by the end of 2014, my country's annual imports of oil and natural gas reached 310 million tons and 45.7 billion cubic meters respectively, and the degree of dependence on foreign countries was respectively 59.6% and 25.6%. At present, 80% of my country's oil production capacity comes from water drive reservoirs, and onshore oilfields generally enter a high water cut period (47.3% and 43.5% of Sinopec and PetroChina's produced reserves have entered an ultra-high water cut period), according to the reserve-production ratio of 1...

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Problems solved by technology

[0004] However, the initial reaction of the anaerobic hydrocarbon degradation of hydrocarbons - the reaction of anaerobic degradation of hydrocarbon substrates to produce hydrogen and acetic acid, the Gibbs free energy change is positive (need to supply energy from the outside), that is, the reaction cannot be spontaneous Therefore, the anaerobic degradation reaction rate of hydrocarbons is largely limited by these reaction processes, resulting in very slow hydrocarbon degradation and gas production under anaerobic conditions. Natural conditions The biodegradation of petroleum requires a time scale of millions of years. Such a reaction rate cannot form large-scale natural gas accumulation in a short period of time. Although the artificial activation method can increase the methane production rate of residual oil to a certain extent, according to the conversion The gas production rate still cannot meet the requirements of large-scale gas reservoir development

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