The preliminary practices show that underbalanced pressure drilling is completely fit to high pressure and low permeability as well as low pressure and leakage formations.
初步实践表明，负压钻井技术完全适用于高压低渗地层和低压易漏地层，其效果明显。
The preliminary practices show that underbalanced pressure drilling is completely fit to high pressure and low permeability as well as low pressure and leakage formations.
初步实践表明，负压钻井技术完全适用于高压低渗地层和低压易漏地层，其效果明显。
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