特低渗透油田水平井压裂产能参数优化研究

摘要

根据特低渗透油田储层特点，首先研究了流体在压裂水平井中的渗流特征，流体流动划分为早期拟径向流阶段、裂缝内的线性渗流及椭圆流动。在此基础之上，给出了修正的产能预测解析模型，该模型同时考虑了流体流向裂缝的压降损失、流体在裂缝中流动汇入水平井筒损失的能量以及流体在裂缝内流向井筒的线性流动，在油田试井资料较完善情况下，该方法较简单。当测试资料较少时，本文提供了一种新方法，利用油藏数值模拟软件对压裂水平井的裂缝参数进行优化模拟，包括裂缝条数、裂缝长度、裂缝间距、裂缝的导流能力、裂缝位置以及裂缝的排布方式，该方法对于评价特低渗透油田压裂水平井产能影响因素具有指导意义。%According to the characteristics of ultra-low permeability oil reservoirs, characteristics of the fluid flow in fractured horizontal wells were studied. The fluid flow was divided into the early pseudoradial flow stage, linear flow inside the crack and elliptic flow. On this basis, revised production forecast analytical model was given; the model takes into account the pressure drop of fluid flowing in the fractures, energy loss during fluid flowing into horizontal wellbore from the fracture and linear flow from the fracture into wellbore. Under better circumstances of testing data, this method is relatively simple. Under less test data, a new method was put forward, it can use reservoir simulation software to optimize fracture parameters of fractured horizontal wells, including the number of fractures, fracture length, fracture spacing, fracture conductivity, crack location and crack arrangement way. The method has the instructive effect for the productivity evaluation of ultra-low permeability reservoir fracturing horizontal wells.