Journal
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Volume 70, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2019.102905
Keywords
CO2 fracturing; CO2 fluid flow; Phase field
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Funding
- National Natural Science Foundation of China [11402146]
- Young 1000 Talent Program of China
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We propose a phase field model to simulate CO2 fracturing under an isothermal condition. We take advantage of the ability of the phase field approach in predicting fracture initiation and branching, and also to avoid tracking the fracture path. We model the CO2 as a compressible fluid by modifying Darcy's law. In particular, we assume the permeability is correlated to the phase field value by an exponential function. The dependence of the CO2 density as a function of the pressure is captured by the Span-Wagner equation of state. The computed breakdown pressure values show good agreement with analytical solutions and experimental results.
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