汶川地震断裂带科学钻探项目WFSD-3孔泥浆技术的设计与应用

汶川科钻WFSD-3孔钻遇地层极其复杂，硬脆碎地层与强水敏性等地层交替出现，给钻进施工带来极大安全隐患。针对该孔特殊地层情况，以孔壁稳定性理论分析为指导，在室内实验研究的基础上，优选出NH4-HPAN、K—PAM、SAS和KHm等抑制剂组成的泥浆体系配方，并结合室内FA无渗透实验以及ZNP-01页岩膨胀性实验对该泥浆配方进行封堵性和抑制性评价，提出了新型泥浆体系，并得以良好应用。还对现场应用遇到的泥浆粘度与切力控制、钻头防泥包技术以及钻水泥塞钙侵处理技术等进行归纳总结，对复杂地层钻进施工具有较好的借鉴意义。

Mud System Design and Application in the WFSD-3 of Wenchuan Earthquake Fault Scientific Drilling Project

The drilling formation of WFSD - 3 hole is extremely complex with hard, brittle and broken formation and high water sensitivity formation appearing alternately, which brought huge hidden danger to the drilling construction. According to the special formation situation of the hole, based on the borehole stability theory analysis and the laboratory experiments, NH4 - HPAN, K - PAM, SAS and KHm inhibitors had been selected out as the optimized additives for the mud system. In addition, the laboratory sand-bed non-filtration experiments and the ZNP- 01 shale swelling experiments had been carried out to evaluate the blocking and inhibitory capacity of the mud formulations. This mud system has satisfactory application effects. The paper also summarized some treatment technologies in the application of mud maintenance, such as mud vis- cosity and gels control technique, the drill bit anti-bailing technique and calcium invasion treatment technique while drilling cement plug, which have a good reference to drilling in the complex formation.