US 12,384,952 B2
Composite cement compositions and methods of cementing and/or treating wells drilled with water-based drilling fluids
Valerie Gisele Helene Lafitte, Sugar Land, TX (US); Dean Michael Willberg, Houston, TX (US); and Anatoly Medvedev, Sugar Land, TX (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on May 18, 2022, as Appl. No. 17/663,989.
Prior Publication US 2023/0374366 A1, Nov. 23, 2023
Int. Cl. C09K 8/467 (2006.01); C04B 24/26 (2006.01); C04B 28/02 (2006.01); C04B 103/00 (2006.01); C04B 111/00 (2006.01); E21B 33/14 (2006.01)
CPC C09K 8/467 (2013.01) [C04B 24/2641 (2013.01); C04B 28/02 (2013.01); E21B 33/14 (2013.01); C04B 2103/0049 (2013.01); C04B 2103/0051 (2013.01); C04B 2111/00146 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A composite cement slurry comprising:
cement comprising at least one of cement particles or cementitious material;
water; and
water swellable particulates that are embedded in the cement at a concentration ranging from 0.1% to 40% by weight of the cement, the water swellable particulates consisting of an elastomeric material doped with hydrophilic swellable polymer.