Details
| Original language | English |
|---|---|
| Article number | 120070 |
| Number of pages | 18 |
| Journal | Renewable energy |
| Volume | 223 |
| Early online date | 29 Jan 2024 |
| Publication status | Published - Mar 2024 |
Abstract
Liquid nitrogen (LN2) fracturing is regarded as a viable alternative for the efficient development of hot dry rock (HDR) resources due to its main advantage in producing complex fracture networks and lowering breakdown pressure. However, the fracturing mechanisms and major factors controlling the LN2 fracturing efficiency are still poorly understood. A thermo-hydro-mechanical-damage (THMD) coupling model is proposed to study the fracture initiation/propagation behavior of LN2 fracturing under various fracturing parameters and reservoir conditions based on a phase-field cohesive zone method (PF-CZM). The characteristic differences between LN2 and water fracturing are compared. Results indicate that the tensile stress of LN2 fracturing is concentrated at the tip of fractures. When the HDR reservoirs are undertaken lower stress level with higher initial rock temperature, the damage ratio can be enhanced. Young's modulus and thermal expansion coefficient are the key petrophysical and mechanical properties affecting the LN2 fracturing performance. The optimal pressurization rate is 0.2 MPa/s. It indicated that a balanced contribution of thermal stress and fluid pressure is crucial to the bifurcation of major fracture and forming complex fracture networks. The major findings of the study are expected to provide theoretical guidance and computational simulation basis for the LN2 fracturing on HDR reservoirs.
Keywords
- Fracture propagation, Hot dry rock, Hydro-thermally induced fracture, Liquid nitrogen fracturing, Phase-field model
ASJC Scopus subject areas
Sustainable Development Goals
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In: Renewable energy, Vol. 223, 120070, 03.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phase-field cohesive zone modeling of hydro-thermally induced fracture in hot dry rock during liquid nitrogen fracturing
AU - Yang, Ruiyue
AU - Hong, Chunyang
AU - Gong, Yanjin
AU - Huang, Zhongwei
AU - Valizadeh, Navid
AU - Zhou, Shuwei
AU - Li, Gensheng
AU - Zhuang, Xiaoying
N1 - Funding Information: This research was supported by the National Natural Science Foundation of China ( 52192621 , 52020105001 ) and China Scholarship Council ( 202106440070 ).
PY - 2024/3
Y1 - 2024/3
N2 - Liquid nitrogen (LN2) fracturing is regarded as a viable alternative for the efficient development of hot dry rock (HDR) resources due to its main advantage in producing complex fracture networks and lowering breakdown pressure. However, the fracturing mechanisms and major factors controlling the LN2 fracturing efficiency are still poorly understood. A thermo-hydro-mechanical-damage (THMD) coupling model is proposed to study the fracture initiation/propagation behavior of LN2 fracturing under various fracturing parameters and reservoir conditions based on a phase-field cohesive zone method (PF-CZM). The characteristic differences between LN2 and water fracturing are compared. Results indicate that the tensile stress of LN2 fracturing is concentrated at the tip of fractures. When the HDR reservoirs are undertaken lower stress level with higher initial rock temperature, the damage ratio can be enhanced. Young's modulus and thermal expansion coefficient are the key petrophysical and mechanical properties affecting the LN2 fracturing performance. The optimal pressurization rate is 0.2 MPa/s. It indicated that a balanced contribution of thermal stress and fluid pressure is crucial to the bifurcation of major fracture and forming complex fracture networks. The major findings of the study are expected to provide theoretical guidance and computational simulation basis for the LN2 fracturing on HDR reservoirs.
AB - Liquid nitrogen (LN2) fracturing is regarded as a viable alternative for the efficient development of hot dry rock (HDR) resources due to its main advantage in producing complex fracture networks and lowering breakdown pressure. However, the fracturing mechanisms and major factors controlling the LN2 fracturing efficiency are still poorly understood. A thermo-hydro-mechanical-damage (THMD) coupling model is proposed to study the fracture initiation/propagation behavior of LN2 fracturing under various fracturing parameters and reservoir conditions based on a phase-field cohesive zone method (PF-CZM). The characteristic differences between LN2 and water fracturing are compared. Results indicate that the tensile stress of LN2 fracturing is concentrated at the tip of fractures. When the HDR reservoirs are undertaken lower stress level with higher initial rock temperature, the damage ratio can be enhanced. Young's modulus and thermal expansion coefficient are the key petrophysical and mechanical properties affecting the LN2 fracturing performance. The optimal pressurization rate is 0.2 MPa/s. It indicated that a balanced contribution of thermal stress and fluid pressure is crucial to the bifurcation of major fracture and forming complex fracture networks. The major findings of the study are expected to provide theoretical guidance and computational simulation basis for the LN2 fracturing on HDR reservoirs.
KW - Fracture propagation
KW - Hot dry rock
KW - Hydro-thermally induced fracture
KW - Liquid nitrogen fracturing
KW - Phase-field model
UR - http://www.scopus.com/inward/record.url?scp=85183962471&partnerID=8YFLogxK
U2 - 10.1016/j.renene.2024.120070
DO - 10.1016/j.renene.2024.120070
M3 - Article
AN - SCOPUS:85183962471
VL - 223
JO - Renewable energy
JF - Renewable energy
SN - 0960-1481
M1 - 120070
ER -