Method of drilling and lining a borehole

Details Method of drilling and lining a borehole Method of drilling and lining a borehole

E - Fixed Constructions

21

B

166/16

E21B 21/00 (2006.01) E21B 21/12 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2018754

METHOD OF DRILLING AND LINING A BOREHOLE A method of drilling and lining a borehole comprises the steps of drilling a borehole while a drilling fluid is circulated through the bores of a multibore drill pipe string and an over-retarded cement slurry is kept substantially stationary in a pipe-formation annulus surrounding said string, whereupon after retrieval of the drilling assembly from the borehole the cement is allowed to set to an annular lining of solid cement alongside the borehole wall. (Fig. 3)

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