Method of drilling a borehole through cavernous underground...

E - Fixed Constructions – 21 – B

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166/16, 61/48, 2

E21B 33/13 (2006.01) C09K 8/42 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1183832

ABSTRACT METHOD OF DRILLING A BOREHOLE THROUGH CAVERNOUS UNDERGROUND FORMATIONS To pass a cavern in an underground formation through which a borehole is being drilled, a cementing tube is lowered through the hole and into the cavern. A lightweight cement slurry (such as a foam cement slurry) is introduced into the cavern to build up a cement column extending between the floor and the ceiling of the cavity at a location where the borehole should pass the cavity.

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