酸化技术中地层水配液的分析与应用

Analysis and application of formation water mixing in acidizing technology

酸化是油气井增产、油水井增注的一项有效技术措施,是通过向地层引人酸性液体,溶蚀储层中的胶结物,从而提高储层的渗透能力。地层引人的新流体与地层水原始矿化度存在差异,从而导致粘土膨胀、分散和运移,堵塞地层孔隙而造成储层的产出率降低。以5口井地层水原始矿化度为基础,配制模拟地层水并配制酸液。通过分析和计算,给出不同酸液体系根据不同水质矿化度的配制要求,从而降低施工中对储层所产生的水敏性伤害。

Acidizing was an effective technical measure to increase oil and gas well production and oil and water well injection.It can improve the permeability of the reservoir by introducing acid liquid into the formation to dissolve the cement in the reservoir.The new fluid introduced into the formation was different from the original salinity of the formation water,which leads to clay expansion,dispersion and migration,plugging the formation pores and reducing the reservoir productivity.Based on the original salinity of formation water from 5 wells,simulated formation water and acid solution were prepared.Through analysis and calculation,the preparation requirements of different acid systems according to different water salinity were given,so as to reduce the water sensitivity damage to the reservoir during construction.