Abstract
A series of ammonium-succinic salts (ASS) was prepared from succinic acid and amines as small molecule shale swelling inhibitor. It was evaluated by bentonite linear expansion test, anti-swelling experiments. And then the best one, ASS-8 (synthesize with succinic acid and tetraethylenepentamine with the ratio of acid group to amine group 1 : 2), was evaluated in water-based drilling fluid. Anti-swelling results shows that ASS-8 can decrease the swelling volume of bentonite by 90.9% with the concentration of 0.8%. Drilling fluid evaluation sho wed ASS-8 has high inhibitive capability to bentonite hydration swelling in the water-based drilling fluid, and it is compatible with heteropolysaccharide(KD-03) and modified starch. The inhibition mechanism of ASS-8 was studied by thermogravimetric analysis and particle distribution test. These results demonstrate ASS-8 may enter the clay layer and bond the clay sheets together by electrostatic adsorption and hydrogen bonds.
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ACKNOWLEDGMENTS
We are grateful to the Modern Analysis and Testing Center of Xi`an Shiyou University.
Funding
The work was supported financially by National Science and Technology Major Project (no. 2017ZX05069004), Shaanxi Provincial Key Research and Development Program (no. 2019ZDLGY06-03) and Youth Innovation Team of Shaanxi University.
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Yuntian Jing, Jie Zhang, Hu, W. et al. Preparation and Evaluation of Ammonium-Succinic Salts as Shale Swelling Inhibitor and Its Application in Water-Based Drilling Fluids. Russ. J. Phys. Chem. B 15 (Suppl 1), S102–S108 (2021). https://doi.org/10.1134/S1990793121090165
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DOI: https://doi.org/10.1134/S1990793121090165