径向井引导水力压裂裂缝定向扩展技术  

Theoretical Research on Radial Wells Orientating Hydraulically Created Fracture Directional Extended

作　　者：田雨[1] 曲占庆[1] 郭天魁[1] 田洋阳 李小龙 张伟[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580 [2]中国石油大学(华东)储运与建筑工程学院,青岛266580

出　　处：《科学技术与工程》2017年第20期154-159,共6页Science Technology and Engineering

基　　金：中央高校基本科研业务费专项资金(15CX06029A)资助

摘　　要：目前,利用径向井压裂改造技术开发低渗透油层、薄油层、裂缝性油气层、注水后"死油区"等受到越来越多地关注;但国内外尚未对此进行系统的研究。受地应力控制和储层非均质性影响,水力压裂裂缝很可能无法顺利沿径向井方向延伸沟通目标区域,导致储层增产效果不理想。基于多径向孔压裂裂缝起裂压力分析和塑性区理论,推导出多口径向井在地应力条件下引导压裂裂缝定向扩展准则。满足该条件时,多径向井会在储层中产生连续塑性区,裂缝在塑性区内扩展不受地应力影响而保持定向扩展,保证了压裂施工时各径向井间裂缝相互贯通,形成沿径向井轴心面方向的主裂缝。兼顾经济性优化出了径向井间的最大间距,为径向井水力压裂技术的有效实施提供了可靠的科学依据。Hydraulic fracturing of radial wells have become new technologies to effectively develop low permeability reservoir, thin reservoir, fractured reservoir, ＆quot;dead area＆quot; after water injection etc.Influenced by ground stress and reservoir heterogeneity, hydraulically created fracture will probably not extend smoothly to connect the target area along the direction of radial wells, the reservoir stimulation effect is not ideal.Based on the pressure analysis of fracturing initiation of multiple radial holes and the theory of plasticity district, criterion of multiple radial wells orientating directional fracture propagation in the condition of earth stress is derived.In this condition, multiple radial wells will produce a continuous plasticity district in the reservoirs, while maintaining the fracture extending in plastic zone directionally without the effect of ground stress, which guarantees that fracture is interconnected between the radial wells during fracturing operation, to form the main crack along the direction of radial wells＆#39; axis plane.In consideration of economy, maximum spacing of radial wells are optimized, in order to provide a reliable scientific basis for effectively implementation of hydraulic fracturing technology in radial wells.

关 键 词：径向井 水力压裂 裂缝起裂 裂缝导向 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]