Incrementally increasing density cementing spacer

Details Incrementally increasing density cementing spacer Incrementally increasing density cementing spacer

E - Fixed Constructions

21

B

166/17

E21B 43/10 (2006.01) E21B 33/14 (2006.01) E21B 33/16 (2006.01)

Patent

CA 2036835

INCREMENTALLY INCREASING DENSITY CEMENTING SPACER ABSTRACT A method of cementing in a wellbore penetrating subterranean formations characterized by employing a graded density spacer fluid intermediate a displacing fluid and a displaced fluid. This is particularly advantageous where a cement slurry is employed as displacing fluid to displace drilling fluid employed to drill a well penetrating subterranean formations. This alleviates problem with intermixing of the two fluids. This invention is doubly advantageous where a well contains both a substantially vertical portion and a substantially horizontal portion, since in the latter portion, the use of this invention enables controlling under-running or over-running of a displacing fluid with respect to a displaced fluid.

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