Method for operating rotary drilling under conditions of...

Details Method for operating rotary drilling under conditions of... Method for operating rotary drilling under conditions of...

E - Fixed Constructions

21

B

255/25

E21B 21/00 (2006.01) E21B 21/08 (2006.01)

Patent

CA 1203229

METHOD FOR OPERATING ROTARY DRILLING UNDER CONDITIONS OF HIGH CUTTINGS TRANSPORT EFFICIENCY ABSTRACT In a rotary method of drilling a well into the earth employing a drilling mud system, the transport ratio (hole cleaning efficiency) is increased by increasing the yield point to plastic viscosity ratio of the drilling fluid while maintaining the plastic viscosity constant. In a preferred embodiment, the plastic viscosity is varied within the range of 7.5 to 30 centipoises and the yield point to plastic viscosity ratio is varied within the range of 0.20 to 1.5.

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