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- Title
CO<sub>2</sub>与清水的压裂特征对比.
- Authors
罗 攀; 孙 晓; 贺 沛; 马春晓; 郭 兴; 穆景福; 刘保录
- Abstract
CO2 fracturing technology has received much attention for its advantages of good fluidity, low damage to reservoir, fast fracturing flowback and easy formation of complex fracture network. Compared with fresh water in fracturing, the viscosity, density and compressibility of CO2 are quite different from those of fresh water, and the physical properties of CO2 are much affected by formation temperature and pressure. Based on Helmholtz free energy, thermophysical state equation is established, which can fully satisfy calculation requirements of thermophysical properties in CO2 fracturing. Comparative study of liquid thermo-physical properties, fracture initiation pressure, the propagation of simple double-wing fractures and propagation of complex fracture networks in natural fractured reservoirs are performed for liquid CO2 fracturing, supercritical CO2 fracturing and fresh water fracturing. The results show that, compared with supercritical CO2 fracturing, fresh water fracturing is easier to form relatively simple fracture network, especially simple double-wing fracture, for its low filtration and relatively high pressure increase speed. The pressurization area of supercritical CO2 is slightly larger than that of liquid CO2, and pressurization area of CO2 in these 2 phases is larger than that of fresh water. CO2 fracturing is more conducive to mixed propagation of tensile fractures and shear fractures, forming complex fracture network. The research results have guiding significance for selection and design between CO2 fracturing and fresh water fracturing.
- Subjects
HELMHOLTZ free energy; CRACK propagation (Fracture mechanics); FRESH water; THERMOPHYSICAL properties; EQUATIONS of state
- Publication
Petroleum Geology & Oilfield Development in Daqing, 2023, Vol 42, Issue 4, p90
- ISSN
1000-3754
- Publication type
Article
- DOI
10.19597/J.ISSN.1000-3754.202205062