Method of drilling a borehole

Details Method of drilling a borehole Method of drilling a borehole

E - Fixed Constructions

21

B

255/25

E21B 21/00 (2006.01) E21B 21/12 (2006.01)

Patent

CA 1270810

K 9647 A B S T A C T METHOD OF DRILLING A BOREHOLE A method of drilling a borehole is provided using a drill bit coupled to the lower end of a pair of concentric drill pipes. During drilling a first low-viscosity fluid, such as oil or water, is circulated through the pipes while a second fluid, such as a weighted viscosified mud, is kept stationary in the pipe-formation annulus. DZRH04

524309

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