Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 2: 1 - 8

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.02.001

Summary

Current Status and Prospect of Study on Supercritical CO2 Fracturing Characteristics

  • Li Xiaogang ,
  • Ran Longhai ,
  • Yang Zhaozhong ,
  • He Yuting ,
  • Liao Zijia ,
  • Cao Wenyan
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. PetroChina Daqing Oilfield Co., Ltd., Daqing, Heilongjiang 163517, China

Received date: 2021-05-06

  Revised date: 2022-01-04

  Online published: 2023-01-10

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Abstract

Previous studies on the characteristics of supercritical CO2 fracture initiation, propagation and conductivity were summarized in order to enhance the understanding of the fracture characteristics of supercritical CO2 fracturing and guide the development of supercritical CO2 fracturing technology. The results showed that the fracture initiation pressure in supercritical CO2 fracturing was lower than that of both liquid and water fracturing, which was mainly caused by that the low viscosity and high diffusivity of supercritical CO2 increased the pore pressure and reduced the fracture initiation pressure; the influencing factors of fracture propagation were complex, mainly dominated by CO2 phase change, rock weak surface structure and the weak surface structure of the rock, but the specific mechanism was not yet clear, and it was necessary to develop experimental devices and establish a three-dimensional model of fracture propagation for more microscopic and detailed study; compared with water fracturing, the roughness, tortuosity and length of fractures in supercritical CO2 fracturing were greater, but the fracture width was smaller and the fracture effectiveness was insufficient; in the supercritical CO2 fracturing, natural and artificial fractures could be sheared in a staggered manner, and CO2 could enter the micro-fractures and pores to destroy the cementation of rock and minerals, causing rock and minerals to fall off to generated unpropped fractures that were conductive, but a study was required for the formation mechanism and maintenance mode. This study provides a reference for the study of fracture characteristics of supercritical CO2 fracturing.

Key words： supercritical CO2; fracturing; fracture characteristics; conductivity of unpropped fracture

Cite this article

Li Xiaogang , Ran Longhai , Yang Zhaozhong , He Yuting , Liao Zijia , Cao Wenyan . Current Status and Prospect of Study on Supercritical CO2 Fracturing Characteristics[J]. Special Oil & Gas Reservoirs, 2022 , 29(2) : 1 -8 . DOI: 10.3969/j.issn.1006-6535.2022.02.001

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