It is very important for drilling engineering and geological staff to assess formation lithology and the working condition of bit.
地层岩性与钻头工况的评估对钻井工程技术人员和地质人员十分重要。
This well is characterized by deep drilling horizon and varied formation lithology, so its predrilling prediction of abnormal pressure is the most significant.
该井钻探层位深、地层变化大，钻前异常地层压力预测尤为重要。
This article started from the geological feature and the characteristics of formation lithology mechanics of the Jiulongshan and optimized the deep well casing programs.
本文从九龙山构造的地质特征、地层岩性力学特性研究出发，优化了九龙山构造深井的井身结构。
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