Experimental Research on Microbial Flooding Technology for Enhancing Oil Recovery in High-pour-point Reservoirs

doi:10.3969/j.issn.1006-6535.2020.06.018

Abstract

Abstract: High pour point oil has the characteristics of high freezing point, high wax content, and high wax precipitation temperature. These characteristics may cause cold damage to the near-well zone, reduce reservoir permeability, and affect seepage law, furthermore, they restrict the effect of recovery enhancing technology like water flooding altering to chemical flooding. In response to these problems, through laboratory experiments the endogenous microorganisms in the formation fluid of Shen84-An12 Block were separated and identified, two high-temperature resistant microbial strains were extracted, the underground activation system of the strains was optimized, and the mechanism of microbial flooding of high pour point oil reservoirs was explored. The experimental results show that the microbial flooding system has the effect of degrading the waxy components of high-pour-point oil. The microbial flooding system can effectively reduce the long-chain saturated hydrocarbons above C₂₀, with degradation rate ranging from 19% to 33%. After the improvement, the freezing point of crude oil was reduced by 2 to 6 ℃, and the recovery rate was 9 percentage points higher than water flooding. This research can provide a reference for solving cold damage in high-pour-point oil reservoirs, improving oilfield development effects, and enhancing development effects.

Key words: microbial flooding, high-pour-point oil, enhancing oil recovery, endogenous microorganisms, Shen 84-An 12 Block, activator optimization

CLC Number:

TE349

Wen Jing, Xiao Chuanmin, Guo Fei, Wang Kuibin, Ma Jing. Experimental Research on Microbial Flooding Technology for Enhancing Oil Recovery in High-pour-point Reservoirs[J]. Special Oil & Gas Reservoirs, 2020, 27(6): 127-132.

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