balanced bottom hole pressure method 井底压力平衡压井法
Axial force is balanced by back vane or balanceable hole, for the specification with big radial force; we adopt double-wear passage design.
轴向力由副叶片或平衡孔平衡，对于径向力在的规格采取了双壳体设计；
Axial force is balanced by auxiliary vanes or balance hole, for big axial force specs adopt double-case design.
轴向力由副叶片或平衡孔平衡，对于径向力大的规格采取了双壳体设计。
The two technical problems faced by the technology of under-balanced horizontal well drilling with gas injection are the down-hole motor and the conventional MWD can't work normally.
注气欠平衡钻水平井技术面临的两大技术难题是井下动力钻具不能正常工作和常规MWD无法正常工作。
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