Experimental study of the fracture characteristics of granite under CO<sub>2</sub> injection condition

XU Chen-yu; BAI Bing; LIU Ming-ze

doi:10.16285/j.rsm.2017.2233

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Experimental study of the fracture characteristics of granite under CO₂ injection condition

更新时间：2026-06-25

- Experimental study of the fracture characteristics of granite under CO₂ injection condition
- Vol. 40, Issue 4, Pages: 1474-1482(2019)
- 作者机构：
  
  1. 湖北工业大学土木建筑与环境学院
  2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.2233
  CLC： TU45
- Published：2019
- 稿件说明：
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[1]徐辰宇,白冰,刘明泽.注CO_2条件下花岗岩破裂特征的试验研究[J].岩土力学,2019,40(04):1474-1482.

XU Chen-yu, BAI Bing, LIU Ming-ze. Experimental study of the fracture characteristics of granite under CO₂ injection condition[J]. 2019, 40(4): 1474-1482. DOI: 10.16285/j.rsm.2017.2233.
[1]徐辰宇,白冰,刘明泽.注CO_2条件下花岗岩破裂特征的试验研究[J].岩土力学,2019,40(04):1474-1482. DOI： 10.16285/j.rsm.2017.2233.

XU Chen-yu, BAI Bing, LIU Ming-ze. Experimental study of the fracture characteristics of granite under CO₂ injection condition[J]. 2019, 40(4): 1474-1482. DOI: 10.16285/j.rsm.2017.2233. DOI：

摘要

增强型采热系统（CO

-EGS）工程中CO

作用下岩石的水压破裂行为是目前亟需解决的一个关键科学问题。从福建漳州采取花岗岩露头

利用自主研制的厚壁圆筒式致裂仪进行了不同流体（CO

、水）的水压致裂试验

研究了CO

、水入渗致裂后花岗岩的破裂特征及破裂机制。研究表明:随着致裂液黏度的减小

试样破裂过程会形成更多且更曲折的微裂纹分支

这意味着

采用CO

压裂可能更有利于形成缝网

从而有助于提高增强型采热（EGS）工程中换热效率;试样的破裂压力随着致裂液黏度的减小而降低

而较低的破裂压有助于注入井的安全运行;试验结果可用从对流换热角度分析的流体岩石相互作用机制解释

进而验证了其准确性。

Abstract

The hydraulic fracturing（HF） behavior under CO

condition is a key scientific issue in CO

-enhanced geothermal system project. The granite specimen was taken from the quarry in Zhangzhou

Fujian province. HF experiments were conducted to investigate the effects of CO

and H2 O on the HF process and crack propagation by using a new independently developed hollow cylinder. This study reveals that with the decrease of the viscosity of the fracturing fluid

a greater number and more sinuous microcrack branches form in the fracture process. This indicates that CO

fracturing may b

e more conducive to the formation of the crack network

which helps to increase the heat exchange efficiency in the CO

-EGS projects. The fracture pressure of the specimen decreases with decreasing the viscosity of the fracturing fluid

which leads to the safe operation of the injection well with a lower value. The experimental results consist with the interaction mechanism of fluid rock from the convective heat transfer perspective

and its accuracy is verified.

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Experimental study of the fracture characteristics of granite under CO2 injection condition

DOI：10.16285/j.rsm.2017.2233

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Experimental study of the fracture characteristics of granite under CO₂ injection condition