低伤害变粘度压裂液体系在双河油田的应用

Application of less harmful viscosity-variable fracturing fluid system in Shuanghe Oilfield

双河油田延长组属于低温、低压、特低渗油藏,自然产能不能满足开发要求,完井后必须采取增产措施。由于储层敏感矿物分布广泛,通过室内实验进行伤害因素分析,优化了该地区的压裂液配方,研制出包括压裂前和后处理液在内的低伤害变粘度压裂液体系。该压裂液体系起到了保护储层、降低伤害的作用,还具有高效防膨、快速破胶、防止地层水锁等优点,能有效降低对地层的二次污染,使压后地层保持良好的导流能力。现场实施了13口油井,增产效果显著。

Yanchang formation in Shuanghe Oilfield belongs to low temperature,low pressure and low permeability reservoir where natural energy is not sufficient to meet development requirement and stimulation measures are necessary.The reservoir has extensively distributed sensitive minerals.Reservoir damage factors are analyzed through laboratory experiment;the formula of fracturing fluid has been optimized for this area;and a less harmful,viscosity-variable fracturing fluid system has been developed including pre- and post-fracturing treatment liquid.This fracturing fluid system protects reservoir,reduces damage and secondary contamination, and has advantages of anti-swelling and fast break,prevents water lock,and remains good flow conductivity after fracturing. Field application in 13 oil wells has shown notable stimulation effect.