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基于相场法的深层干热岩储层水力压裂模拟研究

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为认识深层干热岩储层水力裂缝起裂与扩展规律,基于相场法建立了流-固-热耦合裂缝扩展数值模型,分析了干热岩储层水力压裂裂缝扩展力学行为,研究了温度、排量及天然裂缝等因素对水力裂缝扩展的影响.结果表明,基于相场法建立的流-固-热耦合裂缝扩展数值模型判别准则简单,计算准确;干热岩储层水力压裂过程中,热应力呈现为拉应力,有助于增加裂缝开度,对裂缝扩展起辅助作用;压裂液与地层温度差越大,排量越大,热应力影响效果越显著.水力压裂裂缝遇到天然裂缝后会沟通并开启天然裂缝,再次起裂时受地应力与天然裂缝控制.研究结果可为深层干热岩储层水力压裂提供参考.
Simulation of Hydraulic Fracturing in Deep Hot Dry Rock Reservoir Based on Phase-Field Method
In order to study the hydraulic fracture initiation and propagation mechanisms in deep hot dry rock(HDR)reservoirs,a fluid-solid-heat coupling numerical model for fracture propagation simulation was established based on the phase-field method.This model was used to analyze the mechanical behavior of hydraulic fracture propagation in HDR reservoirs,as well as the effects of factors such as temperature,pump rate,and natural fractures on the hydraulic fracture propagation.The results show that this fluid-solid-heat coupling numerical model has a relatively simple criterion with high calculation accuracy.During the process of hydraulic fracturing in HDR reservoirs,thermal stress acts as tensile stress,which contributes to increasing fracture aperture and facilitating fracture propagation.The larger temperature difference between fracturing fluid and formation,and the higher pumping rates,the more significant effect of the thermal stress.After encountering natural fractures,hydraulic fractures will communicate and initiate those natural fractures,and the re-initiation of fractures is controlled by in-situ stress and natural fractures.The findings of this study can provide a good reference for guiding hydraulic fracturing in deep HDR reservoirs.

hot dry rockphase-field methodfracture propagationmulti-physical field couplingnumerical simulationadaptive meshnatural fractures

戴一凡、侯冰、廖志豪

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油气资源与工程全国重点实验室(中国石油大学(北京)),北京 102249

石油工程教育部重点实验室(中国石油大学(北京)),北京 102249

中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依 834000

干热岩 相场法 裂缝扩展 多物理场耦合 数值模拟 自适应网格 天然裂缝

国家重点研发计划国家自然科学基金国家自然科学基金重点项目中国石油大学(北京)青年拔尖人才项目

2022YFE01298005207431152334001ZX20230042

2024

10.11911/syztjs.2024047

石油钻探技术
中国石油化工股份有限公司　石油勘探开发研究院石油钻井研究所

石油钻探技术

CSTPCD北大核心
影响因子：1.611
ISSN：1001-0890
年,卷(期)：2024.52(2)