CPC C09K 8/22 (2013.01) [C09K 2208/10 (2013.01); C09K 2208/12 (2013.01); C09K 2208/22 (2013.01)] | 9 Claims |
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.
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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.
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