深孔岩心钻探问题探讨

Analysis on Deep-hole Geological Core Drilling

摘要:

深孔岩心钻探的核心问题是孔壁稳定，其钻前预测涉及地层孔隙压力、地层应力、地层坍塌压力和破裂压力，是实现深孔岩心钻探优质、安全、高效和低成本的关键，决定着孔身结构、套管程序与套管强度、钻井液密度与流变性能的设计。以孔壁稳定为基础，从孔身结构和套管程序、钻具组合、钻探设备方面论述深孔岩心钻探存在的问题，并提出具体的改进建议。

Abstract:

The hole-wall stability is one of the focuses of deep-hole geological core drilling. The accurate prediction of formation pore pressure, in-situ stress state, formation collapses pressure and fracture pressure before drilling are vital to conduct quality, safe, efficient and low-cost drilling. These are the design basis of the hole-wall structure, casing program and strength, density and rheological properties of drilling fluids. Based on the hole-wall stability, discussion is made on the existing problems of hole-wall structure, casing program, drilling tool assembly, drilling equipment in deep-hole geological core drilling and suggestions are put forward for the improvement.