速溶型低损害疏水缔合聚合物压裂液的研究与应用
Oilfield Chemistry(2017)
Abstract
常用的胍胶压裂液残渣含量高、对地层损害率大,而大部分粉状聚合物类稠化剂溶解时间较长,无法满足大型压裂连续混配对稠化剂溶解时间的要求.为解决上述问题,以速溶型疏水缔合聚合物GAF-TP为稠化剂、非离子型表面活性剂GAF-2为增效辅剂、GAF-16(季铵盐类)为黏土稳定剂配制了压裂液,优选了压裂液配方,对压裂液的耐温抗剪切能力、岩心损害等性能进行了评价,并在鄂尔多斯盆地某气井进行了现场应用.结果表明,GAF-TP溶解性和增黏能力好于胍胶,溶解时间短,室内常温下的溶解时间为60 s,现场(5℃)溶解时间为1数2 min;配方为0.5%GAF-TP+0.3%GAF-2+0.3%GAF-16的压裂液耐温抗剪切性较好,对岩心基质渗透率的损害率和压裂液破胶液对支撑充填层渗透率的损害率均小于10%,对储层的损害小于胍胶压裂液;该压裂液现场施工顺利,压后无阻流量达11.85×104 m3/d,返排率达到80%,增产效果显著.
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