Application of cross-diameter wireline corer drilling tool in deep hole geological core drilling
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摘要: 深孔地质岩心钻探施工中,传统的同口径绳索取心钻具在面对复杂地质环境时,存在钻进效率低、环状间隙小、岩心损坏率高等技术难题,严重制约了深孔钻探技术的发展。研究通过优化钻杆与钻头的组合设计,开发了跨口径系列绳索取心钻具,并对其受力特性进行了系统分析。通过力学建模和实验验证,确定了不同口径组合下的应力分布和扭转刚度特征,建立了钻具优化设计方法。在某稀土矿区勘探、四川盆地页岩气勘探与云南普洱地热井等工程实践中,研究结果表明: 跨口径钻具能够承受8 000 N·m高扭矩和200 kN钻压,最大钻探深度达1 500 m; 在高温(200 ℃)、高压(30 MPa)环境下保持稳定性能,钻进效率提升35%,岩心采集率最高达98%。研究成果为解决深孔地质钻探中的技术难题提供了新的解决方案,对提高深部地质勘探效率和岩心采集质量具有重要的指导意义。Abstract: In the drilling construction of deep hole geological core, the traditional drilling tool of same-diameter wireline corer has technical problems of inefficient drilling, narrow tubular annulus, and high defective rate under complex geological environment, restricting the deep hole drilling development. By optimizing the combination of drilling pipe and drilling bit, the authors in this research developed cross-diameter wireline corer drilling tool, and systematically analyzed the mechanical characteristics. The stress distribution and torsional stiffness under different diameter combinations were identified through mechanical modeling and experimental verification, and drilling tool optimization scheme was constructed. The engineering practices of a rare earth mine exploration, shale gas exploration in Sichuan Basin and Pu'er geothermal well in Yunnan Province shows that the cross-diameter drilling tool could bear high torque of 8 000 N·m and drilling pressure of 200 kN, with the maximum drilling depth of 1 500 m. And this cross-diameter drilling tool show good stability under high temperature of 200 ℃ and high pressure of 30 MPa, with the drilling efficiency rising 35% and the core acquisition rate reaching 98%. The research results provide new solutions for technical problems during deep hole geological core drilling, and important practice guidance for improving deep geological exploration efficiency and core collection quality.
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Key words:
- deep hole geology /
- core drilling /
- cross-diameter /
- wireline corer /
- drilling tool
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