US 11,898,415 B2
Cement compositions and methods
Anatoly Vladimirovich Medvedev, Moscow (RU); Dominic Vincent Perroni, Houston, TX (US); Laure Martin-Al-Khatib, Bourg la Reine (FR); Adam Ethan Keilers, Richmond, TX (US); and Petr Kolchanov, Sugar Land, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 17/254,418
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Jun. 28, 2019, PCT No. PCT/US2019/039720
§ 371(c)(1), (2) Date Dec. 21, 2020,
PCT Pub. No. WO2020/009918, PCT Pub. Date Jan. 9, 2020.
Claims priority of provisional application 62/693,173, filed on Jul. 2, 2018.
Prior Publication US 2022/0136365 A1, May 5, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 33/14 (2006.01); C09K 8/467 (2006.01); E21B 33/138 (2006.01); C04B 28/02 (2006.01)
CPC E21B 33/14 (2013.01) [C04B 28/02 (2013.01); C09K 8/467 (2013.01); E21B 33/138 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for cementing a subterranean well, comprising:
preparing a cement slurry comprising water, a hydraulic cement and particles of an oil-absorbent material, wherein the particles absorb a non-aqueous component of a drilling fluid and alter rheological properties of the drilling fluid within the subterranean well, and wherein an amount of the oil-absorbent material particles varies, in portions of the cement slurry, between 0% by weight of the cement (BWOC) and 40% BWOC;
placing the cement slurry in the subterranean well and thereby creating a cement sheath in the subterranean well with a variable oil-absorbent material amount;
allowing the oil-absorbent material particles to contact the non-aqueous drilling fluid component, thereby altering the rheological properties of the drilling fluid and swelling the oil-absorbent material particles;
wherein the oil-absorbent material particles are elongated, having an aspect ratio between 1.1 and 2000 before the swelling and between 2.2 and 3500 after the swelling.