Supramolecular polymer-based gel fracturing fluid with a double network applied in ultra-deep hydraulic fracturing

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外文摘要：A gel based on polyacrylamide,exhibiting delayed crosslinking characteristics,emerges as the preferred solution for mitigating degradation under conditions of high temperature and extended shear in ultra-long wellbores.High viscosity/viscoelasticity of the fracturing fluid was required to maintain excellent proppant suspension properties before gelling.Taking into account both the cost and the potential damage to reservoirs,polymers with lower concentrations and molecular weights are generally preferred.In this work,the supramolecular action was integrated into the polymer,resulting in signif-icant increases in the viscosity and viscoelasticity of the synthesized supramolecular polymer system.The double network gel,which is formed by the combination of the supramolecular polymer system and a small quantity of Zr-crosslinker,effectively resists temperature while minimizing permeability damage to the reservoir.The results indicate that the supramolecular polymer system with a molecular weight of(268-380) × 104 g/mol can achieve the same viscosity and viscoelasticity at 0.4 wt％due to the supra-molecular interaction between polymers,compared to the 0.6 wt％traditional polymer(hydrolyzed polyacrylamide,molecular weight of 1078 × 104 g/mol).The supramolecular polymer system possessed excellent proppant suspension properties with a 0.55 cm/min sedimentation rate at 0.4 wt％,whereas the 0.6 wt％traditional polymer had a rate of 0.57 cm/min.In comparison to the traditional gel with a Zr-crosslinker concentration of 0.6 wt％and an elastic modulus of 7.77 Pa,the double network gel with a higher elastic modulus(9.00 Pa)could be formed only at 0.1 wt％Zr-crosslinker,which greatly reduced the amount of residue of the fluid after gel-breaking.The viscosity of the double network gel was 66 mPa s after 2 h shearing,whereas the traditional gel only reached 27 mPa s.

外文关键词：

Ultra-deep reservoirGel fracturing fluidDouble networkSupramolecular polymer systemProppant suspension property

作者：

Yong-Ping Huang、Yong Hu、Chang-Long Liu、Yi-Ning Wu、Chen-Wei Zou、Li-Yuan Zhang、Ming-Wei Zhao、Cai-Li Dai

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作者单位：

School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,PR China

Shandong Key Laboratory of Oilfield Chemistry,China University of Petroleum(East China),Qingdao,266580,Shandong,PR China

SINOPEC Petroleum Exploration and Production Research Institute,Beijing,102206,PR China

CNOOC China Co Ltd,Tianjin Branch,Tianjin,300459,PR China

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基金：

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaInnovation Fund Project for Graduate Students of China University of Petroleum(East China)

项目编号：

521201050075237406223CX04047A

出版年：

2024

DOI：

10.1016/j.petsci.2024.03.018

石油科学(英文版)

中国石油大学（北京）

石油科学(英文版)

影响因子：0.88

ISSN：1672-5107

年,卷(期)：2024.21(3)