罗布泊盐湖深部钾盐地质科学钻探LDK02孔冲洗液工艺

罗布泊盐湖深部钾盐地质科学钻探LDK02孔钻遇地层主要为第四系松散层，其中，卵砾石层及砂层孔段易发生坍塌埋钻事故，粘土层孔段易缩径卡钻，导致钻探施工中孔壁极不稳定、极易引发孔内事故；现场使用卤水配制冲洗液，对冲洗液处理剂性能影响较大，导致配制的冲洗液胶体稳定性差、易沉淀分层、不能有效悬浮和携带岩粉。针对上述问题，对现场卤水进行了离子成分分析，选用抗盐性能好的处理剂配制卤水冲洗液，在LDK02孔现场应用，取得了良好效果，保证了钻探施工的顺利实施。

Drilling fluid for the potassium geological scientific drilling boreholeLDK02 in deep Lop Nur Salt Lake

The formation encountered in drilling the potassium geological scientific drilling borehole LDK02 in deep Lop Nur Salt Lake was mainly the Quaternary loose overburden, where bit burial was prone to happen due to borehole collapse in gravel, and bit sticking due to borehole contraction in clay, resulting in the hole wall extremely unstable and accidents easy to occur during drilling. Brine used to prepare the drilling fluid on-site had a significant influence on the performance of the additives of the drilling fluid, resulting in many problems of the drilling fluid, such as poor colloidal stability, easy sedimentation and delamination, ineffectively carrying and removing cuttings. To deal with the above problems, the ionic composition analysis was carried out on the on-site brine, and the additives with good salt resistance was selected to make brine based drilling fluid, which was applied in drilling the borehole LDK02 with good results, ensuring the smooth implementation of the drilling work.