Methods for servicing subterranean wells

Details Methods for servicing subterranean wells Methods for servicing subterranean wells

E - Fixed Constructions

21

B

E21B 33/138 (2006.01)

Patent

CA 2715700

The present invention relates to methods for controlling lost circulation in subterranean wells, in particular, fluid compositions and methods for operations during which the fluid compositions are pumped into a wellbore, enter voids in the subterranean-well formation through which wellbore, fluids-escape, and. form a seal that limits further egress of wellbore fluid from the wellbore. The methods comprise preparing a carrier fluid containing compressed expandable foam that may be encapsulated. The carrier fluid is then placed into a lost-circulation zone, whereupon the foam expands to form a barrier that minimizes or blocks further ingress of carrier fluid. Lost-circulation control may be supplemented by introducing additional lost- circulation materials, pumping a cement slurry behind the foam-containing carrier fluid or both.

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