摘要
体积压裂技术的起裂模式突破了单一方向的张性起裂,具有复杂缝网的扩展形态。作为一种新兴的增产技术,其相关渗流理论与试井模型的研究正处于起步阶段。以Warren-Root模型为基础,以双区复合为特征,建立了一种可以描述体积压裂直井渗流规律的基本模型:首先将渗流分为改造区的流动与非改造区的流动,用格林函数和达西径向流描述油藏渗流过程,然后在两区分界面处进行油藏压力和流量的耦合。经过数学求解后得到了新模型下的压力及压力导数双对数特征曲线,并分析了储容比、窜流系数,以及流度比对模型曲线的影响。实例应用表明,该模型有效实现了垂直井、双重介质和径向复合储层的耦合。
Initiation modal of volume fracturing technique breakthroughs the single direction of tensional initiation fracture,having complex extending shapes of fracture networks. As a new technique,the seepage flow mechanism and well testing model are far from perfect. Based on petro-physics and Warren-Root model,a basic model describing the flow law of volume fracturing to vertical well is established.Firstly,the seepage flow in the reservoir is divided into two processes,the flow in SRV and the flow outside SRV. Green function and Darcy flow mechanism are applied to describing the two sections. Then,the two processed are coupled at the interface with equivalent pressure and flow rates. The pressure and pressure derivative type curve is obtained by mathematical solution and storage ratio,interporosity flow coefficient,as well as the influencing of mobility to modal curve are also analyzed. Field examples show that this modal realizes an efficient model coupling of vertical well,two-porosity media and radial composite reservoir.
出处
《油气井测试》
2014年第4期4-8,75,共5页
Well Testing
基金
国家重大科技专项"大型油气田及煤层气开发"(2011ZX05016)
国家科技重大专项"复杂油气田地质与提高采收率技术"(2011ZX05009)
高等学校博士学科点专项科研基金(新教师类)(20120007120007)内容
关键词
体积压裂
不稳定试井
格林函数
达西渗流
双重介质
径向复合
volume fracture,transient well test,Green function,Darcy flow,double-porosity,radial composite
