Open AccessNumerical simulation of temperature field in crack of supercritical carbon dioxide fracturing
Author(s) -
Zhou Yi,
Ni Hongjian,
Shen Zhonghou,
Wang Wenpeng,
Wang Meishan
Publication year - 2020
Publication title -
energy science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 29
ISSN - 2050-0505
DOI - 10.1002/ese3.653
Subject(s) - supercritical fluid , carbon dioxide , displacement (psychology) , petroleum engineering , materials science , porous medium , supercritical carbon dioxide , porosity , viscous fingering , carbon sequestration , heat transfer , mechanics , flow (mathematics) , plane (geometry) , geology , composite material , thermodynamics , chemistry , geometry , mathematics , organic chemistry , psychotherapist , psychology , physics
Supercritical carbon dioxide (SC‐CO 2 ) fracturing technology has far‐reaching application potential for unconventional resources which is beneficial to water protection and CO 2 sequestration. In this paper, temperature field in the crack of SC‐CO 2 fracturing which will affect flow behavior of SC‐CO 2 and the carrying capacity for proppants has been studied. A generalized and pragmatic numerical method coupled with the physical properties model of CO 2 and heat and mass transfer in the formation rock has been established to calculate the variations of temperature and density in the crack during fracturing. Porous medium model was used to describe the formation rock which would make the calculation more accurate. Rules of influence distance of the rock with time and injection displacement were analyzed. Distribution of temperature in XY plane is symmetrical, while temperature on the bottom wall is much less than that of the top wall in XZ plane. Decrease in injection temperature and increase in injection displacement will make the temperature of SC‐CO 2 lower at the same position which is beneficial to the proppant transportation. Therefore, low injection temperature and high displacement are suggested in the application in order to make a longer proppant bed. Besides, the density of SC‐CO 2 is relatively high in the formation of low rock porosity which will make the fracturing more effective. The results obtained in this paper will provide reference for SC‐CO 2 fracturing design which could promote the development of this technology.