Rotary Mud Drilling

Rotary mud drilling utilizes three-cone roller, poly crystalline diamond (PCD), or tungsten impregnated drill bits to wear away at the cutting face. This is preferred because of the speed of drilling and the relatively low cost when compared to some other drilling types. This form of drilling is utilized by many different sized rigs, from small man portable rigs right through to the largest oil rigs. Rotating hollow drill pipes carry down bentonite, barite and polymer impregnated drilling mud's to lubricate, cool, and clean the drilling bit. The mud travels to the surface around the outside of the drilling rods. Examining rock chips extracted from the mud is known as chip sampling.

Geophysical logging is frequently employed to evaluate the existence of possible coal, mineral or oil and gas deposits in the well hole. This is normally conducted after drilling, by lowering measurement tools into the newly-drilled hole.

The rotary system of drilling was in general use in Texas in the early 1900s. It is a modification of one invented by Fauvelle in 1845, and used in the early years of the oil industry in some of the oil-producing countries in Europe.

The rotary mud technologies have been adopted from the oil industry and are commonplace in both the coal and mineral exploration industries.

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Last modified: 11/21/07