水力压裂缝动态非对称延伸过程数值模拟
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杜书恒(1994—),男,安徽定远人,博士,从事储层地质力学方面的研究。联系电话:18813134652,E-mail:dushuheng@pku.edu.cn。

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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)。


Numerical simulation of dynamic asymmetric extension process in hydraulic fracturing
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    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。

    Abstract:

    From the aspect o“f 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.

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杜书恒,庞姗,师永民.水力压裂缝动态非对称延伸过程数值模拟[J].油气地质与采收率,2018,25(4):106~114

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  • 在线发布日期: 2018-06-04