秦岭造山带多金属矿普查复杂地层护壁堵漏技术

Borehole protection and leakage control in complex strata of polymetallic deposit survey in Qinling Orogenic Belt

摘要:

秦岭造山带多金属矿普查项目钻探施工过程中钻遇多种复杂地层，垮塌、缩径、漏失等复杂情况频发，严重影响了施工效率。分别采用了植物胶钙处理钻井液、聚乙烯醇无固相钻井液等进行护壁工作，结合不同漏失情况分别实施了随钻堵漏、凝胶堵漏等技术措施，取得了良好的使用效果。

Abstract:

During reconnaissance drilling for polymetallic deposit survey at Qinling Orogenic Belt, different complex strata were encountered, such as collapse, shrinkage, leakage and so on, which seriously affected drilling efficiency. The calcium treated vegetable gum drilling fluid and solid-free polyvinyl alcohol fluid were used for borehole protection, respectively. According to different leakage situations, technical measures such as plugging while drilling, gel plugging were implemented, and good results were achieved.