Novel Mussel‐Inspired High‐Temperature Resistant Gel with Delayed Crosslinking Property for Ultra‐Deep Reservoir Fracturing

Author:

Xu Zhongzheng12,Zhao Mingwei12ORCID,Yang Ziteng1,Wang Pan3,Liu Jiawei4,Xie Yuxin1,Wu Yining12,Gao Mingwei12,Li Lin12,Song Xuguang5,Dai Caili12

Affiliation:

1. State Key Laboratory of Deep Oil and Gas China University of Petroleum (East China) Qingdao 266580 China

2. Key Laboratory of Unconventional Oil & Gas Development China University of Petroleum (East China) Ministry of Education Qingdao 266580 China

3. School of Energy Resources China University of Geosciences (Beijing) Beijing 100083 China

4. Shale Gas Research Institute PetroChina Southwest Oil & Gas Field Company Chengdu 610051 China

5. Department of Chemical and Materials Engineering University of Alberta Edmonton AB T6G 1H9 Canada

Abstract

AbstractMussel‐inspired materials have been widely studied due to their excellent adhesion and self‐healing properties, but few studies have introduced this interesting property into the fracturing development of deep/ultra‐deep oil and gas fields. Herein, a new type of mussel‐inspired delayed crosslinking gel fracturing fluid is reported, which is formed by mussel‐inspired polymers containing many catechol groups and organic zirconium delayed crosslinkers. The strong supramolecular interaction in mussel‐inspired polymers can construct a more complex and stable dually cross‐linked polymer network based on conventional chemical crosslinking, to cope with harsh conditions such as high temperature and shear in reservoirs. After shearing at 200 °C, the reserved viscosity of mussel‐inspired delayed crosslinking gel is as high as 95 mPa·s. More importantly, the viscosity of gel remains basically unchanged at 25 °C, and the cross‐linking is completed within 300 s at 90 °C. The chemical force probe atomic force microscope (AFM) technology has successfully demonstrated that catechol groups are the main source of supramolecular interaction in mussel‐inspired polymers. The molecular simulation results show that due to the addition of catechol groups, the hydrogen bond interactions within the mussel‐inspired polymers molecules are enhanced. And the additional hydrogen bonds formed are more stable at high temperature.

Funder

National Science Fund for Distinguished Young Scholars

National Natural Science Foundation of China

Publisher

Wiley

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