连续循环系统在科学超深井中的需求分析

Requirement Analysis on Continuous Circulation System for Scientific Ultra-deep Drilling

摘要:

作为“入地”重要手段的科学深井、超深井工程是研究深部地质学的重要方法，被誉为“伸入地壳的望远镜”。科学超深井井内超高温高压成为钻井作业中突出的技术难题之一，其对钻井液、井底动力机具、井下检测仪器、铝合金钻柱提出了极为苛刻的要求，致使工程难度增大、风险提高、工期加长。通过对科学超深井钻井工程特点的总结，分析了钻井液连续循环对井眼稳定性和井底温度的影响，得出了连续循环系统对于科学超深井钻井作业具有较强的技术需求的结论。对我国未来万米科学超深钻计划提供了技术支持。

Abstract:

As the important means of “drilling down into deep earth”, scientific deep drilling and ultra-deep drilling become important methods, which are known as “telescope into the earth’s crust”. Ultra-high temperature and high pressure in scientific ultra-deep well is one of the most prominent technical difficulties in drilling operation, so rigorous standards were put forward to the drilling fluid, down-hole motor, aluminum alloy drill pipe and so on, the project becomes more difficult with higher risk and prolonged construction duration. This paper summarizes the characteristics of scientific ultra-deep drilling engineering and analyzes the effect of drilling fluid continuous circulation on borehole stability and downhole temperature, it is concluded that scientific ultra-deep well has strong technical demand for continuous circulation system and this system would provide technical support for future scientific ultra-deep drilling program in China.