多次加砂压裂裂缝延伸模型研究与应用  

Study and application of fracture propagation model of multiple sand fracturing

作　　者：柳春林[1,2] 王锐[3] 

机构地区：[1]中国石油大学,北京102249 [2]西安石油大学,陕西西安710065 [3]中油冀东油田分公司,河北唐山063000

出　　处：《特种油气藏》2011年第2期76-78,139,共3页Special Oil & Gas Reservoirs

基　　金：国家大型气田与煤层气开发项目"苏里格气田油藏改造技术研究"(2008ZX05001)

摘　　要：在考虑多次加砂压裂时,加砂过程中砂堤高度变化对缝中流体流动及后续支撑剂沉降产生影响的基础上,建立了适用于多次加砂压裂的拟三维裂缝延伸模型,用数值模拟的方法对裂缝扩展进行预测。模型包括压裂液在缝中流动的连续性方程、压降方程、裂缝宽度方程及高度方程。其中压降方程是在平板流理论、力学平衡原理的基础上建立起来的,与常规压降方程不同的是方程考虑了砂堤高度变化对流体流动的影响。计算结果表明,多次压裂和常规压裂相比增产效果理想。现场试验表明多次压裂对储层改造效果好,对提高油气产量具有重要的意义。In multiple sand fracturing process,the height of sand bank has certain influence on fluid flow in fractures and subsequent proppant settlement.A pseudo 3D model is built to predict fracture propagation in multiple sand fracturing process through numerical simulation.The model includes continuity equation,pressure drop equation,and fracture width and height equation of fracturing fluid flowing in fractures.The pressure drop equation is based on the plate flow theory and mechanic equilibrium principle,and its difference from conventional pressure drop equation is that it takes the effect of sand bank height on fluid flow into account.The computation shows that multiple fracturing is more effective in increasing production than conventional fracturing.Field test shows that multiple fracturing is an effective reservoir stimulation method and has significant meaning to improving oil production.

关 键 词：压裂 多次加砂 砂堤 裂缝 压降 长庆油田华152区 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]