US 11,753,575 B2
Organic-inorganic nanocomposite gel and oil-based drilling fluid
Gang Xie, Chengdu (CN); Ruolan Wang, Chengdu (CN); Jinjun Huang, Chengdu (CN); and Yang Bai, Chengdu (CN)
Assigned to Southwest Petroleum University, Chengdu (CN)
Appl. No. 17/802,545
Filed by Southwest Petroleum University, Chengdu (CN)
PCT Filed Jun. 16, 2022, PCT No. PCT/CN2022/099052
§ 371(c)(1), (2) Date Aug. 26, 2022,
PCT Pub. No. WO2022/267968, PCT Pub. Date Dec. 29, 2022.
Claims priority of application No. 202110694702.4 (CN), filed on Jun. 22, 2021.
Prior Publication US 2023/0118402 A1, Apr. 20, 2023
Int. Cl. C09K 8/512 (2006.01); C08F 220/06 (2006.01); C08F 220/56 (2006.01); C08K 9/06 (2006.01); C09K 8/34 (2006.01)
CPC C09K 8/512 (2013.01) [C08F 220/06 (2013.01); C08F 220/56 (2013.01); C08K 9/06 (2013.01); C09K 8/34 (2013.01); C08F 2800/20 (2013.01); C08F 2810/20 (2013.01); C09K 2208/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for preparing an organic-inorganic nanocomposite gel sealing agent, comprising the following steps:
(1) modification of nano-molybdenum disulfide: place nano-molybdenum disulfide in 75-80° C. vacuum drying tank for 10-12 h to dry, add 2-3 g of the dry nano-molybdenum disulfide to 40-50 ml of ethanol/water to form a dispersion, ultrasonicate for 40-50 min, then add 2-3 g of 3-aminopropyltriethoxysilane while stirring, react 8-10 h at 75-80° C., wash with ethanol and repeat 3-5 times before placing in 55-60° C. vacuum drying tank for 8-10 h to obtain modified nano-molybdenum disulfide;
(2) preparation of the organic-inorganic nanocomposite gel:
1 add the modified molybdenum disulfide to a reactor with ultra-pure water and ultrasound for 10-15 min to form a dispersion;
2 add comonomer of 2-ethyl acrylic acid and N, N-dimethylacrylamide, crosslinker of N, N-methylene bisacrylamide, stir rapidly to dissolve under nitrogen 20-30 min;
3 warm the reaction system to 55-60° C. while stirring, add ammonium persulphate and keep at a constant reaction temperature for 3-4 h;
4 after the reaction is completed, the temperature is reduced to 20-25° C., and the prepared sample is washed with distilled water to neutral, then dried in 60-70° C. oven;
5 grind the dried sample.