Viscosity modifiers and methods of use thereof
(22) 20.03.2017
(43) 27.09.2018
(57) A method of cementing a wellbore comprises injecting into the wellbore a cement slurry comprising an aqueous carrier, a swellable nanoclay, and a solid delayed releasing divalent inorganic salt comprising calcined magnesium oxide, calcined calcium oxide, calcium magnesium polyphosphate„ a borate, a nitride, a silicate, an agent having a cation of Ba2+, Sr2+, Fe2+, Ni2+, or a combination comprising at least one of the foregoing; and allowing the cement slurry to set.
(71) Baker Hughes Incorporated, 17021 Aldine Westfield, Houston, Texas 77073 (US)
(84) ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
