Nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor and its preparation method and application

Patent metadata

Field	Value
Publication number	US-11807802-B2
Application number	US-202217653030-A
Country	US
Kind code	B2
Filing date	Mar 1, 2022
Priority date	Jan 18, 2021
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor is obtained by performing hydrophobic modification for nano-particles through long-chain organosilicon together with a surface-active agent. A preparation method of the said hydrophobic shale surface hydration inhibitor comprises steps as follows: 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; a long-chain organosilicon solution is then dropwise added to the mixed solution A for reaction under stirring conditions to obtain mixed solution B; 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 inhibitor.

First claim

What is claimed is:

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.

2. The said nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 1 , wherein the said long-chain organosilicon is octyl triethoxy silane, dodecyl trimethoxy silane, cetyl trimethoxy silane, or octadecyl trimethoxy silane, and the said nanoparticles are with a particle size of 20-30 nm.

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.

4. The said preparation method of the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 3 , wherein the solvent in step (1) is a mixed solution of water and ethanol; the volume ratio of water and ethanol in the mixed solution is 4-6:1 and preferred to be 5:1; the ratio between the mass of the nanoparticles and the volume of the solvent is 0.08-0.15 g: 1 mL.

5. The said preparation method of the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 3 , wherein, in step (1), the reaction system is adjusted to a pH of 9-11 by NaOH aqueous solution with a mass fraction of 20%.

6. The said preparation method of the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 3 , wherein the said long-chain organosilicon solution in step (2) is obtained by dissolving long-chain organosilicon in ethanol; the mass ratio of the long-chain organosilicon to the ethanol is 5˜8:10˜30; the mass ratio of the long-chain organosilicon to the nanoparticles is 5˜8:10˜15.

7. The said preparation method of the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 3 , wherein in step (2), the said stirring speed is 150˜300 r/min, the said reaction temperature is 40˜60° C., and the reaction time is 1˜2 h.

8. The said preparation method of the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 3 , wherein, in step (3), the mass ratio between the surface-active agent and the nanoparticles is 5˜8:8˜12.

9. The said preparation method of the nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor according to claim 3 , wherein, in step (3), the said stirring speed is 500˜700 r/min, the said reaction temperature is 60˜80° C., and the reaction time is 4˜6 h; part of the solvent is removed with the vacuum distillation method to obtain the nano-organosilicon hydrophobic shale surface hydration inhibitor with a solids content of 20-22%; the pressure of the vacuum distillation is 0.1 MPa, and the temperature is 50° C.

Assignees

• Univ China Petroleum East China

Inventors

• Huang Xianbin
• Sun Jinsheng
• Li He
• Lv Kaihe
• Liu Jingping
• Jin Jiafeng
• Wang Jintang
• Bai Yingrui

Classifications

• C09K8/22 Primary

  Synthetic organic compounds · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title

• C09K2208/12

  Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating · CPC title

• C09K2208/22

  Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers · CPC title

• C09K8/03

  Specific additives for general use in well-drilling compositions · CPC title