It was observed from examples that eccentricity of drill string had major effect on the axial flow rate of Power-law screw fluid when the other parameters were invariant.

从算例可以发现：在其它参数不变的情况下，钻柱的偏心对幂律流体螺旋流轴向流量的影响非常大。

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Practice and results show that the gas survey method with a gas-collecting tank for foam drill fluid samples is another effective method.

实践和资料说明，罐装泡沫样聚气录井方法是泡沫钻井中气测录井的另一种行之有效的方法。

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The laying position and well blowout pressure are analyzed and discussed briefly and the relationship curve of drill bit pressure drop vs flowrate and fluid density i.

对其安放位置及井喷压力进行了简要分析和探讨，建立了钻头压降与流量、流体密度的关系曲线。

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Drilling engineers use tons of a thick fluid called drilling mud to lubricate drill bits as they chew through rock.

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Under drilling services the company provides drill bits, drilling fluid systems, completion systems, and integrated project management for well construction projects.

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Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.

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