Spacer composition and method of use

Details Spacer composition and method of use Spacer composition and method of use

E - Fixed Constructions

21

B

31/10

E21B 43/22 (2006.01) C09K 8/42 (2006.01)

Patent

CA 1082438

ABSTRACT OF THE DISCLOSURE A composition comprising water, a water soluble alkali metal silicate, and a water soluble metal compound capable of releasing a multivalent metal cation to react with the soluble silicate to form a pumpable gel is employed as a spacer for displacing a drilling mud from a borehole, particularly immediately preceding injection of a fluid, such as a cement slurry, containing compounds capable of detrimentally reacting with the mud. Option- ally, the composition may contain one or more of: a water dispersible cellulose compound and an inert particulate which cooperate to provide fluid loss control; a chelating agent for polyvalent metal cations; a weighting material; a material to minimize lost circulation, and a salt to stabilize fresh water sensitive sandstones and shales.

296299

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