矿化度梯度注水工艺新技术研究

注水是保持地层压力、提高原油采收率的主要措施之一。对含有敏感性矿物的砂岩储层,注水引起的水敏伤害是导致注水井吸水能力下降的主要原因之一。针对荣兴屯油田储层含敏感性矿物较高的特点,开发了将注入水矿化度逐级从地层水矿化度降至水源水矿化度的梯度注水工艺新技术。为加强增注效果并便于现场实施再辅以投加粘土稳定剂。室内试验及现场应用表明,该工艺较常规的措施适应性强,增产增注效果好。

RESEARCH OF NEW SALINITY GRADIENT WATER INJECTION TECHNOLOGY

Water injection is one of the major measures to keep formation pressure and improve oil recovery. But water sensitive damage cauSed by waterflood is also one of the major reasons causing the descending of injectors' injectivity for the sandy formation with sensitive minerals. A new gradient water injection technology of descending step by step the injection water salinity to the formation water salinity was developed based on the characteristics of with higher sensitive minerals in formation of Rongxingtun Oilfield. At the same time, in order to enhance waterflood effect and be convenient to implement in oilfield, clay inhibitors were put into injected water. The experiment in lab and application in oilfield showed that the new technology had greater adaptability than other routine measures and had produced good stimulation effects.