METHOD OF REDUCING FLUID LOSS IN CEMENT COMPOSITIONS

摘要

Cementing compositions having improved fluid loss capabilities, improved corrosion resistance, improved settling characteristics for use in elevated temperature environments in subterranean formation cementing operations are disclosed. More particularly, such compositions include water, hydraulic cement, a styrene/butadiene latex, the styrene to butadiene being present in a ratio of 10/90 to 90/10 by weight and a surfactant comprising a salt of a C12-15 Pareth 10-40 sulfonate. For use at temperatures above 200.degree.F. a stabilizer and retarder comprising a selected copolymer of AMPS?/acrylic acid also preferably is present (AMPS? is a trademark of The Lubrizol Corporation for 2-acrylamido-2-methylpropanesulfonic acid). Additionally, methods of cementing a conduit in a borehole penetrating an earthen formation by introducing such a cementing composition into the space between such a conduit and a formation are disclosed.