杂多糖钻井液抗温抑制性能评价

为改善杂多糖钻井液抑制剂--SJ钻井液的抗温性能，通过岩屑滚动回收率实验、泥页岩线性膨胀率实验、泥球浸泡实验以及流变性能参数和滤失量随SJ钻井液添加量变化关系曲线，评价了SJ钻井液的抗温抑制性能。结果表明：水基钻井液中SJ添加量为1%～6%时，SJ钻井液具有合理的泥页岩抑制性、流变性和滤失性，抗温极限为140 ℃；SJ钻井液的抑制作用机理包括“连续半透膜”和“胶体软粒子填充降滤失”以及“硅锁封固壳去水化”等方面。该成果为开发保护油气层的水基钻井液又找到一类新型的抑制剂。

An evaluation of high-temperature inhibition behavior of heteropolysaccharide drilling fluids

The purpose of this study is to improve the high-temperature performance of the inhibitor of the heteropolysaccharide drilling fluid SJ,which is evaluated by drill cuttings recycling recovery rate experiment,linear shale expansion rate experiment,mud ball soaking test,and plotting of curves of rheologic parameters and filtration vs.SJ fluid dose.The study shows when the dose of SJ is added to WBM by 1-6%,the SJ fluid will have good properties like shale inhibition,rheology and filtration,and can work normal...