塔中4油田水平井打开油层钻井液评价

AN EVALUATION ON DRILLING FLUIDS OF HORIZONTAL WELL IN TAZHONG-4 OILFIELD

本文利用塔中４油田天然岩心进行了油基钻井液、阳离子水基钻井液、聚合物钻井液、正电胶钻井液等多种钻井液的大量流动实验，并对各种钻井液及其滤液对地层的损害程度和造成的原因进行了对比分析，优选出适合塔中４油田水平井的钻井液体系──油基钻井液。

The following experiments have been evaluated about the oil-base drilling fluid, water-base drilling fluid, polymer drilling fluid, MMH drilling fluid, and their filtrates with natural cores obtained from Tazhong-4 oilfield. The degrees of formation damage from various drilling fluids have been compared with each other and their causes are also discussed. The oilbase drilling fluid that ilas protected formation from damage most effectively is suitable to completion of horizontal well in Tazhong-4 oilfield.