Efficient Drilling Technology for High Abrasive Formation in Yuanba Region

Abstract:

Due to the complex lithology, poor drillability, tough abrasiveness and high formation pressure of continental facies Lower Shaximiao formation to Xujiahe formation, poor ROP, long drilling cycle and low efficiency are encountered by using conventional drilling cone bit and PDC bit, while by introducing the expensive imported torsion impactor + PDC or impregnated diamond bit + turbodrill, ROP can be obviously improved, but economic benefits is bad. In order to reduce the drilling cost, according to the geological characteristics of the tough abrasive formation, the development and optimization of personalized bits and supporting efficient tools are carried out, the efficient integrated drilling technology system is formed for tough abrasive formation in Yuanba region, that is, the developed KS1362ADGR type PDC bit + domestic high-torque screw motor in the formation upside Zhenzhuchong section of Ziliujing formation and domestic NR826M type impregnated diamond bit + high-speed screw motor in Zhenzhuchong section and Xujiahe formation. The field application of 3 wells showed that the average ROP increased by 64.7% compared with well completion indicators in 2012—2013; the average drilling cycle shortened by 36.3% even in the situation of well section length increased by 8.7%. This technology will have a guiding function in high abrasive formations drilling in Xujiahe formations in the Northeast and Western Sichuan.