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Desorption behaviour of polymers on sepiolite surfaces under high-temperature and high-salinity conditions

Published online by Cambridge University Press:  02 August 2023

Ling Lin ,
Yukun Yang ,
Xin Li ,
Guobin Jiang  and
Pingya Luo
Ling Lin*
Affiliation:
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, Sichuan, China
Yukun Yang
Affiliation:
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
Xin Li
Affiliation:
CNOOC China Ltd, Hainan Branch, Haikou, Hainan, China
Guobin Jiang
Affiliation:
Safety, Environmental Protection and Technical Supervision Institute of PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan, China
Pingya Luo
Affiliation:
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, Sichuan, China
*
Corresponding author: Ling Lin; Email: cowbolinling@aliyun.com
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Abstract

Polymers maintain colloidal stability by adsorbing onto the surface of sepiolite particles, and changes in temperature and salinity can affect this process. We chose three typical polymers to investigate their interactions with sepiolite under high-salinity (15 wt.% NaCl) conditions at >180°C. Sepiolite samples were characterized using infrared testing, X-ray diffraction testing, contact angle testing, thermogravimetric testing, filtration loss testing and rheological testing. The experimental results showed that the desorption of the polymers under high-temperature and high-salinity conditions reduces the stability and filtration control of the suspension significantly. Adding polymers to sepiolite suspensions can maintain good stability even after thermal ageing at 240°C. In terms of drilling fluid regulation, sepiolite can play a role in regulating rheological properties, and the interactions between various polymers and sepiolite can be utilized to maintain the stable colloidal state of the drilling fluid. Studying the adsorption behaviour of various types of polymers on the surface of sepiolite under high-temperature and high-salinity conditions has important implications for the design and selection of sepiolite drilling fluid treatment agents.

Keywords

Desorptionhigh temperature and high salinitypolymersepiolite
Type
Article
Information
Clay Minerals , Volume 58 , Issue 3 , September 2023 , pp. 235 - 244
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Editor: Chun Hui Zhou

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