US 11,807,802 B2
Nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor and its preparation method and application
Xianbin Huang, Qingdao (CN); Jinsheng Sun, Qingdao (CN); He Li, Qingdao (CN); Kaihe Lv, Qingdao (CN); Jingping Liu, Qingdao (CN); Jiafeng Jin, Qingdao (CN); Jintang Wang, Qingdao (CN); and Yingrui Bai, Qingdao (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao (CN)
Filed by CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao (CN)
Filed on Mar. 1, 2022, as Appl. No. 17/653,030.
Application 17/653,030 is a continuation of application No. PCT/CN2021/072983, filed on Jan. 21, 2021.
Prior Publication US 2022/0228050 A1, Jul. 21, 2022
Int. Cl. C09K 8/22 (2006.01)
CPC C09K 8/22 (2013.01) [C09K 2208/10 (2013.01); C09K 2208/12 (2013.01); C09K 2208/22 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor, wherein the said shale surface hydration inhibitor is obtained by performing hydrophobic modification of nano-particles with a long-chain organosilicon together with a surface-active agent; the said long-chain organosilicon is a long carbon chain alkyl-trialkoxysilane; the said long carbon chain alkyl is a C8-C18 straight-chain alkyl group; the said surface-active agent is hexadecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium bromide, docosyl trimethyl ammonium chloride, or dodecyl trimethyl ammonium bromide; the said nano-particles are nano-silicon dioxide, nano-alumina, or nano-calcium carbonate.
 
3. A preparation method of the said nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 1, comprising steps as follows:
(1) Nano-particles are added to the solvent under stirring conditions, and then an ultrasonic dispersion is performed; upon the end of the ultrasonic dispersion, the reaction system is adjusted to a pH of 9-11 to obtain mixed solution A;
(2) A long-chain organosilicon solution is dropwise added to the mixed solution A to react under stirring conditions to obtain mixed solution B;
(3) A surface-active agent is added to the mixed solution B for reaction under stirring conditions; upon the reaction is finished, part of the solvent is removed to obtain the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor.