Patent ID: 6710107
Filing Date: 2004-03-23
Classification: C04B,C09K

Abstract:
A cement slurry intended to be set in a wellbore through at least one geologic formation having a certain permeability, characterized in the cement slurry comprising cement, at least one mineral filler consisting of silica with a grain size distribution ranging between 5 and 200 &mgr;m, water and a determined amount of a copolymer, designated as HMPAM, having hydrophilic (Hy) and hydrophobic (Hb) units in aqueous solution, said copolymer having the following structure: â€”(Hb)â€”(Hy)â€” with a statistical distribution, wherein Hy has the following form: andHB has the following form: where said copolymer has weight average molecular weight of between 8Â·106 and 107 daltons.