Unstable formation was often met in drilling engineering.
工程施工钻孔中，经常遇到不稳定地层。
Earth stress is the basis of drilling engineering design and field development project design.
地应力是钻井工程设计和油气田开发方案设计的基础。
Earth stress is the basis of drilling engineering design and field development project design.
地应力是钻井工程设计和油气田开发方案设计的基础。
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