压裂压后裂缝闭合模型及其应用  

Application of Fracture Closure Model for Fractured Wells

作　　者：许雷[1] 郭大立[1] 孙涛[1] 罗振兴[1] 李铁军[1] 

机构地区：[1]西南石油大学,成都610500

出　　处：《重庆科技学院学报（自然科学版）》2012年第3期47-49,74,共4页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家科技重大专项示范工程19(2011ZX05062-008)

摘　　要：综合运用流体力学和岩石力学的相关理论以及物质平衡原理,建立压裂压后裂缝闭合模型。通过模型求解分析裂缝闭合过程中井口压力的变化规律,给出裂缝闭合时间和支撑剂沉降距离的计算方法。实例分析和应用表明,低渗透储层人工裂缝自然闭合时间过长,支撑剂沉降距离较大,导致压裂液对地层和裂缝的污染严重,最终影响压裂效果,因此,压裂压后合理选择液体返排时机非常重要。Theoretical model of fracture closure is developed based on mass balance principle rock mechanics and fluid dynamics theory.This paper analyzes the wellhead pressure variation during fracture closure and gives a calculation method of both time fracture closure and roppant settlement-distance.Analysis and application show that both the time of the artificial fractures nature closing time and the distance of roppant settlement have grown which make a serious pollution on both formation and fracture,and ultimately affect the fracturing effect at low permeability layer condition,therefore,reasonable choice of fluid flowback time is of great significance.

关 键 词：水力压裂 压裂返排 裂缝闭合 闭合模型 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]