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Edition and Publication:
< Natural Gas and Oil > Editorial Department
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China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
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Postal Code:
610041
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Issue:ISSN 1006-5539
CN 51-1183/TE

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Effect of Network Poly-Quaternary Ammonium Salt on the Clay Swelling and Particle Size

Author of the article:Zhang Jie, Li Lili, Tang Ying, Chen Gang, Tang Deyao, Zhao Jingrui

Author's Workplace：1.College of Chemistry and Chemical Engineering, Xi' an Petroleum University;2.Shaanxi Yanchang Petroleum Oilfield Chemical Technology Corporation Limited

Key Words：Network poly-quaternary ammonium salt; Hydrate swelling; Particle size; Shale inhibitor

Abstract：

Dimethylamine and epichlorohydrin were used as raw materials and piperazine as the cross-linking agent to synthesize a kind of shale inhibitor. With the linear expansion rate of bentonite as evaluation index, the synthetic conditions were optimized. The inhibitive performance of the inhibitor was evaluated through various ways. Bentonite linear expansion experiment results showed that the inhibitor synthesized with dimethylamine and epichlorohydrin with the mole ratio of 1: 1 and 2.0% piperazine under 120°C displayed the best performance. Anti-swelling results and mud ball experiment fit very well with the results of bentonite linear expansion tests. The anti-swelling rate is increasing with the increase of concentration, then crosslinked polycation inhibitors were slightly better than uncrosslinked polycation inhibitors. Laser particle size analyses showed that hydration dispersing of clay can be significantly inhibited if the inhibitor was added before hydration, and the hydrated clay can be flocculated even the inhibitor was added after the hydration.