注入水中微生物对安塞低渗透储层的伤害评价

Experimental Evaluation on Formation Damage of Ansai Low Permeability Reservoir by Microorganisms within Injected Water

毕永强 俞 理 黄立信 伊丽娜 马 婧 丛拯民

BI Yongqiang YU Li HUANG Lixin YI Lina MA Jing CONG Zhengmin

为了改善安塞油田低渗透储层的注水开发效果、 确定注入水中微生物限制指标， 系统研究了腐生菌（TGB）、 硫酸盐还原菌 （SRB） 和铁细菌 （IB） 对储层的伤害情况。研究表明： 这 3类菌在安塞油田注入水中普遍存在， 其中 TGB和 SRB的菌浓均为 1.1×104个/mL， 而 IB的菌浓为 7.0×103个/mL， 它们可以在安塞油藏水环境中稳定存在， 有危害扩大化的潜在性； 三类菌的等效球体半径处于 0.377数 0.766 μm之间， 与低渗透岩心的 0.46倍孔喉半径相当， 容易形成稳定的架桥堵塞； 流动实验表明， SRB对储层的伤害性最大， 菌浓应严格控制在 101个/mL范围内， 而 TGB和 IB的菌浓也应当限制在 102个/mL范围内。图 5表2参 17

In order to improve the effect of water flooding in Ansai low permeability reservoir and determine the microbial limits of injection water，the damage to reservoir caused by saprophytic bacteria（TGB），sulfate reducing bacteria（SRB）and iron bacteria（IB）was studied systematically. The study showed that these three kinds of bacteria widely existed in Ansai injection water and could stably live in the Ansai reservoir water environment，which might result in the expanded potential hazard in the future. The equivalent sphere radius of three types of bacteria were between 0.377 μm and 0.766 μm，which was equivalent to 0.46 times the radius of the hole with the low permeability core，as a result，it was easy to form a stable bridge plug. Flow experiments showed that the SRB was the most harmful bacteria，its concentration should be lower than 101 cells/mL，and TGB and IB concentration should be lower than 102 cells/mL.

10.19346./j.cnki.1000-4092.2017.01.009