一种钻井液用泥页岩抑制剂JXA-1的评价及应用

Evaluation and Application of Shale Inhibitor JXA-1 for Drilling Fluid

摘要: 常规水基钻井液在钻遇富含黏土矿物的泥页岩地层时，由于泥页岩水化膨胀易导致地层造浆、井壁失稳。钻井液用泥页岩抑制剂JXA-1是一种两亲型的有机阳离子酰胺聚合物，室内证明该抑制剂具有良好的抑制性能和抗盐抗钙性能，JXA-1的加入降低了岩心的线性膨胀率，同时JXA-1与水基钻井液的配伍性良好，介绍了其在2口井的成功应用，为页岩气水基钻井液钻井提供了一种新的抑制剂。

Abstract: When conventional water-based drilling fluid encounters shale formation rich in clay minerals, it is easy to cause mud formation and wellbore instability due to hydration and expansion of shale. JXA-1, a kind of amphiphilic organic cationic amide polymer, is a shale inhibitor for drilling fluid. It has been proved that JXA-1 has good inhibition performance, salt resistance and calcium resistance. The addition of JXA-1 reduces the linear expansion rate of the core, and the compatibility of jxa-1 with water-based drilling fluid is good. The successful application of JXA-1 in two wells is introduced, which provides a new inhibitor for drilling of shale gas water-based drilling fluid.