基于有限元裂缝网络的压裂液滤失模拟  

Filtration Simulation of Fracturing Fluid Based on Finite Element Fracture Network

作　　者：李勇明[1] 刘鹏[1] 赵金洲[1] 罗攀[1] 

机构地区：[1]油气藏地质与开发工程国家重点实验室(西南石油大学),四川成都610500

出　　处：《石油天然气学报》2014年第9期132-136,7,共5页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(51344005);国家科技重大专项(2011ZX05014-006)

摘　　要：压裂液滤失速度是水力压裂设计分析中的重要参数之一,对于裂缝性储层,它可以用裂缝型储集层压裂液滤失数学模型来计算,但是现有的压裂液滤失数学模型并没有考虑天然裂缝呈不规则网络分布且形态复杂这些因素对滤失的影响。因此,在考虑这些因素的前提下,以压裂液沿着天然裂缝向基质渗滤为基础,建立了裂缝网络的等效连续介质滤失模型,运用有限元方法求得了数值解。新方法能模拟复杂裂缝形态对滤失过程中压力分布的影响,克服了传统方法不能模拟裂缝弯曲、相交、方位变化等对滤失影响的局限。The filtration speed of fracturing fluid was one of the important parameters in hydraulic fracturing design and analysis.For fractured reservoirs,it could be calculated by the mathematical model of fracturing fluid filtration for the fractured reservoirs,but the available mathematical model of fracturing-fluid filtration for the fractured reservoirs din not consider the effects of the natural fracture's irregular network distribution and complex shape on the filtration.So under the premise of considering these factors,an equivalent continuous medium filtration model of the fracture network was established based on fracturing-fluid flow from the natural fracture to the matrix,and the method of finite element was also applied to derive a numerical solution.The new method can simulate the effect of the complex fracture shapes on the pressure distribution during the filtration process,overcome the traditional method's limitation that can't simulate the bending,intersection and azimuth changes of the natural fractures.

关 键 词：天然裂缝 压裂液 裂缝网络 有限元 滤失模型 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]