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吸附诱导表面应力的分子动力学模拟

期刊名称：中国科学技术大学学报
时间：0
页码：1209-1215
语言：中文
分类：TV139.1[水利工程—水力学及河流动力学]
作者机构：[1]中国石油勘探开发研究院,北京100083, [2]中国科学技术大学近代力学系,安徽,合肥230026, [3]中国石油大学(北京)石油和天然气工程学院,北京102200
相关基金：国家自然科学基金项目（10632080）
相关项目：陶瓷材料的动态力学特性和抗侵彻机理研究

关键词：水平井, 水力压裂, 有限元, 流固耦合, 裂缝, horizontal well, hydraulic fracturing, finite element, fluid-solid coupling, fracture

中文摘要：

对水平井进行水力压裂,一口井可以形成多条横向裂缝,增产效果比直井更明显,因此近年来水平井压裂应用越来越广泛。该文以ABAQUS软件为平台,采用流固耦合单元模拟岩石的应力渗流耦合行为,采用带有孔隙压力自由度的粘结单元模拟油层和隔层的破裂和扩展,射孔连接微环隙和横向裂缝,即假设了双向同时起裂和扩展的可能性。对大庆油田某水平井分段压裂过程建立了三维非线性流固耦合水力压裂模型,地层参数和物性参数取自该水平井的数据,进行了数值模拟。模拟结果得到了不同时刻油层和隔层的裂缝形态、孔隙压力分布、应力和应变分布等,裂缝高度远远小于裂缝长度,与施工现场裂缝形态吻合良好;模拟得到的井底压力时间历程曲线与现场施工实测得到的井底压力时间历程曲线吻合良好,进一步验证了计算模型的正确性和合理性。

英文摘要：

Multiple transverse fractures could be generated in the process of horizontal well hydraulic fracturing,which may achieve higher productivity than vertical well hydraulic fracturing,so more and more horizontal well hydraulic fracturings were performed in recent years.In this paper,fluid-solid coupling elements were used to describe the behavior of rock fluid-solid coupling,and pore pressure cohesive elements were employed to simulate the process of fracture initiation and propagation in oil and barrier layers,thus perforations were connected to micro-annulus and transverse fractures,making it possible that micro-annulus fracture and transverse fracture propagate simultaneously.A 3D non-linear fluid-solid coupling finite element model for a horizontal well in Daqing Oilfield was established with the ABAQUS platform.Numerical simulations were performed for a staged fracturing process of the horizontal well.The parameters of formation and physical properties in simulations were adopted from Daqing Oilfield.Fracture geometry,pore pressure distribution,stress and strain distribution in oil and barrier layers were obtained.Fracture height was much smaller than fracture length.The fracture geometry obtained from numerical simulation was in good coincidence with that obtained from field measurement.The pressure history evolution at the bottomhole obtained from numerical simulation was consistent with field measurement results.The correctness and rationality of the simulation model were verified.

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