高凝油油藏微生物驱提高采收率实验研究

doi:10.3969/j.issn.1006-6535.2020.06.018

摘要/Abstract

摘要： 高凝油具有凝固点高、含蜡量高、析蜡温度高的特点,可能对近井地带产生冷伤害,降低油藏渗透率,影响渗流规律,并且制约了水驱转化学驱等提高采收率技术的试验效果。针对该问题,通过室内实验对辽河油田沈84-安12块地层流体中内源微生物进行分离与鉴别,提取了2种耐高温优势微生物菌种,优化了菌种地下激活体系,探究高凝油油藏微生物驱机理。实验结果表明:微生物驱油体系具有降解高凝油蜡质组分作用,有效降低C₂₀以上长链饱和烃,降解率达到19%～33%,改善后原油凝固点降低2～6 ℃,较水驱可提高采收率9.0个百分点。该研究为解决高凝油油藏冷伤害、改善油田开发效果提供了借鉴。

关键词: 微生物驱, 高凝油, 提高采收率, 内源微生物, 沈84-安12块, 激活剂优化

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

中图分类号:

TE349

温静, 肖传敏, 郭斐, 王奎斌, 马静. 高凝油油藏微生物驱提高采收率实验研究[J]. 特种油气藏, 2020, 27(6): 127-132.

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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