Method for improving oil well yields by means of oil pool indigenous microorganisms

Abstract

The invention relates to a microorganism enhanced oil recovery method, in particular to a method for improving oil well yields by means of oil pool indigenous microorganisms. The method includes the following steps of (1) screening of a test oil well, (2) screening of activating agents, (3) confirming of the injection rate of the activating agents, (4) confirming of well closing time and (5) on-site testing. By means of the indigenous microorganisms existing in the activated oil well, on-site test cost is thereby saved, different formulas of the activating agents are chosen according to the different indigenous microorganisms, activating effects and on-site test effects are effectively improved, the stratum cannot be damaged and the environment cannot be polluted when nutrient substances are injected, and therefore the method can be widely used for microorganism enhanced oil recovery.

Description

technical field

[0001] The invention relates to a microbial oil recovery method, in particular to a method for improving oil well production by utilizing endogenous microorganisms in oil reservoirs. Background technique

[0002] Microbial oil recovery refers to the comprehensive action of microorganisms and their metabolites (biosurfactants, biopolymers, biogas), reservoir rocks and fluids to improve the fluid mobility ratio, so as to achieve the purpose of enhancing oil recovery. Microbial oil recovery technology has the advantages of low investment cost, no environmental pollution and wide range of reservoir adaptation, so it has broad field application prospects.

[0003] Microbial oil recovery technology mainly includes microbial flooding for enhanced oil recovery and microbial single-well treatment for oil recovery. Microbial single-well huff and puff refers to injecting and screening specific bacteria into production wells. Through the action of bacteria itself and it...