干热岩储层多簇缝网压裂热流固顺序耦合模型研究

doi:10.13809/j.cnki.cn32-1825/te.2022.06.005

Abstract

Abstract:

In order to solve the problem that thermal-hydro-mechanical coupling model of hot-dry-rock（HDR） reservoir fracturing is complex and it is difficult to achieve large-scale multiple cluster of fracturing network simulation, a sequential coupling simulation method of HDR fracturing is proposed. By establishing a fracture expansion thermodynamic solid sequential coupling model of single cluster fracture and multi-cluster fracture network, the thermal-hydro-mechanical sequential coupling simulation of large-scale HDR fracture network is realized. The influence of brittleness index, stress field displacement and other key parameters on the propagation of fracture network are analyzed in this model. The results showed that high temperature difference, large brittleness index and large injection pumpage could promote the propagation of fracture network, but large stress difference is not conducive to the propagation of fracture network.

Key words: hydraulic fracturing, hot-dry-rock（HDR） reservoir, thermal-fluid-solid coupling, multiple cluster of fracturing network, numerical simulation

CLC Number:

TE319

Shaoying CHEN,Wei WANG,Qingchun YANG, et al. Sequential coupling thermal-hydro-mechanical model for multiple cluster of fracturing network fracturing in dry hot rock reservoir[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(6): 869-876.

Figures/Tables 11

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参数名称	参数值	参数名称	参数值
模型尺寸（m）	200×400	压裂液黏度（Pa·s）	0.001
网格基本尺寸（m）	0.5~2.0	射孔长度（m）	16
储层渗透率（10^-3 μm²）	0.000 1	Cohesive单元厚度（m）	0.001
储层孔隙率（%）	10	黏性正则化系数	0.000 1
压裂液密度（kg/m³）	1 000	原位地应力（MPa）	50/65/50
储层弹性模量（GPa）	15	初始孔隙比	0.1
储层泊松比	0.15	压裂液流量（m³/min）	6
损伤强度（MPa）	6/20/20	储层温度（℃）	100
单元损伤位移（m）	0.001	压裂液温度（℃）	10
滤失系数	1×10^-14	注入时间（s）	4 000

Sequential coupling thermal-hydro-mechanical model for multiple cluster of fracturing network fracturing in dry hot rock reservoir

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