The aerated foam mud fluids can used in negative drilling, and enlarge the life of drilling bits for its low density, and low sap pressure.

充气泡沫泥浆由于比重低，液柱压力低，实现了负压钻进，能大幅度提高机械钻进，延长钻头寿命。

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Different combinations of PDC drilling bits hydraulic parameters are comprehensively reflected by flow field energy transformation at oil well bottoms.

针对实际PD C钻头建立了不同的流场计算模型，比较分析了流场能量的变化规律。

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Different combinations of PDC drilling bits hydraulic parameters are comprehensively reflected by flow field energy transformation at oil well bottoms.

PD C水力参数的不同综合表现为井底流场能量的变化。

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And as one who doesn't do valve design, drilling bits, precision flow monitoring or pigging equipment, lots of the kit on display at the Offshore Europe exhibition in Aberdeen this week leaves me a bit cold.

BBC: Aberdeen's pipeline of solutions

Directional drilling, bits, submersible pumps, pressure pumping, oilfield chemicals (which is about to be huge, as shale wells get frakked)--they do it all.

FORBES: Mountains and Molehills

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

FORBES: Pronounce It 'Shlum-Bur-Zhay' And Value It At $106