元坝高研磨性地层提速提效集成钻井技术

Efficient Drilling Technology for High Abrasive Formation in Yuanba Region

摘要:

四川元坝地区陆相下沙溪庙组—须家河组地层岩性复杂、可钻性差、研磨性强、地层压力高，使用牙轮钻头、PDC钻头等常规钻井技术钻速慢、周期长、效率低，引进扭力冲击器+PDC钻头、孕镶金刚石钻头+涡轮等进口提速工具费用昂贵，提速效果明显，但经济效益差。为降低钻井成本，结合地层地质特性，开展了个性化钻头及配套提速工具的研制及优选，形成了元坝高研磨性地层提速提效集成钻井技术，即自流井组珍珠冲段以上地层采用研制的KS1362ADGR型PDC钻头+国产大扭矩螺杆马达；珍珠冲及须家河组地层优选国产NR826M型孕镶金刚石钻头+高转速螺杆马达。通过3口井现场试验表明：同比2012—2013年完钻井指标，平均机械钻速提高64.7%；在井段长度增加8.7%的情况下，平均钻井周期缩短36.3%。该技术将对川东北、川西须家河组等高研磨性地层钻井具有指导作用。

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.