Mud drilling machinery and equipment is an important part.

泥浆泵是钻探机械设备的重要组成部分。

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Air drilling is a kind of under-balanced drilling technology with air, whose rock breaking form is different from conventional mud drilling.

空气钻井技术是以空气作为循环介质的欠平衡钻井技术，其钻头的破岩形式与常规泥浆钻井有很大的区别。

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The mud in a mud drilling and water pumping well drilled through the Quaternary System can be only removed partly as the well is washed intensively.

泥浆钻进的第四系抽水钻孔，强化洗井后，只能部分消除泥浆钻进的影响。

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The BP company pumped heavy drilling fluids,known as mud, into the top of its damaged well in the Gulf of Mexico.

VOA: special.2010.08.07

Late last year Chevron and deepwater driller Transocean incurred a relatively minor spill of a couple thousand barrels of oil-laced drilling mud at the Frade prospect they were drilling off the coast of Brazil.

FORBES: Thumbing Nose At Brazil, Chevron Is Near Deal With Argentina's YPF

During the pumping and displacement of the heavyweight spacer used to displace the mud, a breach in pressure integrity resulted in the undetected loss of drilling mud into the probably uncemented well-bore.

FORBES: BP Full Of Fault For Gulf Spill But Obama Guilty Of Propagating Economic Disaster

The tough bit is getting the requisite amount of drilling mud far enough down the well.

ECONOMIST: The Gulf oil spill