水力压裂缝动态非对称延伸过程数值模拟  

Numerical simulation of dynamic asymmetric extension process in hydraulic fracturing

作　　者：杜书恒 庞姗[2,3] 师永民[3] DU Shuheng;PANG Shan;SHI Yongmin(The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing City,100190,China;School of Earth and Space Sciences,Peking University,Beijing City,100871,China;Oil and Gas Institute,Peking University,Beijing City,100871,China)

机构地区：[1]中国科学院力学研究所非线性力学国家重点实验室,北京100190 [2]北京大学地球与空间科学学院,北京100871 [3]北京大学石油与天然气研究中心,北京100871

出　　处：《油气地质与采收率》2018年第4期106-114,共9页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"大型油气田及煤层气开发"子课题"低渗-超低渗油藏套损井失控储量潜力研究"(2017ZX05013005-009)

摘　　要：从"人工油气藏开发"的角度,采用全缝长压裂缝模拟技术,结合储层精细地质建模技术对低渗透储层水力压裂过程中形成的原位储层-支撑剂复合体的动态延伸过程及其变化特征进行探索,提出以水力压裂缝动态非对称指数来表征水力压裂缝动态非对称延伸特征,构建原位储层-支撑剂复合体的评价参数,探索水力压裂缝动态非对称指数在常规测井曲线中的响应特征,并据此建立基于常规测井曲线的水力压裂缝动态非对称延伸特征的方法。研究结果表明,全缝长压裂缝模拟技术优于仅基于常规测井数据的半缝长非对称压裂缝模拟技术,便于开展储层非均质性研究。水力压裂缝动态非对称指数可以反映水力压裂缝在某一压裂时长的非对称延伸规模水平,结合储层物性与目前开发动态可为实现储层的充分动用提供指导。水力压裂缝动态非对称延伸特征剖析是提高采收率的重要研究方向。From the aspect of “artificial reservoir development”,the whole-fracture simulation method and fine geologic modeling were applied to the study of the dynamic extension process and the characteristics of the combination of proppant and in-situ low-permeability reservoir formed in hydraulic fracturing process. A new index named“dynamic asymmetric index of hydraulic fracture”could be used to characterize the characteristics of hydraulic fracturing dynamics,which is the evaluation parameter of the combination of in-situ reservoir and proppant. The dynamic response characteristics of this index in conventional logging curve was explored,and the evaluation system of dynamic asymmetric extension characteristics based on conventional logging data was established. The research results show that the whole-fracture simulation method is better than the semi-fracture asymmetric simulation method based on the conventional logging data,which is helpful to reservoir heterogeneity research. The dynamic asymmetric index of hydraulic fracture can reflect the asymmetric extension scale of hydraulic fracturing in a certain fracturing time. Combined with reservoir physical properties and current development state,it can provide guidance for the full utilization of reservoirs. The analysis of dynamic asymmetric extension characteristics of hydraulic fracture is an important research direction for EOR.

关 键 词：压裂 全缝长 非对称 动态提高采收率 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]