汶川地震断裂带科学钻探项目WFSD-4S孔冲洗液技术

Research on Drilling Fluids Technology for WFSD-4S Hole of Wenchuan Earthquake Fault Scientific Drilling Project

摘要:

针对汶川地震断裂带科学钻探项目四号孔浅孔（WFSD-4S）地质条件复杂，孔壁稳定性差，坍塌、掉块严重等问题，采用了双聚防塌冲洗液体系。该体系具有良好的稳定性和流变性，携屑能力强，防塌效果好，在WFSD-4S孔钻进施工中取得了良好的应用效果。通过对冲洗液配方的优化和性能参数的合理调整与维护，较好地解决了WFSD-4S孔的钻进技术难题，为顺利完成钻孔施工奠定了坚实的基础。

Abstract:

The geological conditions were extremely complicated with poor wall stability and severe sloughing problems in WFSD-4S hole of Wenchuan earthquake fault scientific drilling project. To solve the above problems, the drilling fluid system of bi-polymer anti-sloughing system was adopted in the drilling construction, which had excellent properties of stability, rheology, cuttings carrying and anti-sloughing, and presented effective application result in WFSD-4S hole drilling construction. Through optimizing the formula of drilling fluid and rationally adjusting and maintaining the performance parameters, the technical difficulties in WFSD-4S hole drilling were successfully solved, which laid a solid foundation for smooth completion of drilling construction.