页岩气藏压裂水平井产能特征研究

Capacity Characteristics Studies of Horizontal Wells with Hydraulic Fractures in Shale Gas Reservoirs

页岩气具有独特的储层特性与流动特征,其数值模拟方法与常规油气藏有很大差异。基于多重介质模型建立及基质离散模拟吸附气和游离气的瞬变流动方法,对储层进行体积压裂改造,实现了体积压裂模型的构建;在此基础上结合X井的生产数据对吸附类型、基质离散程度、裂缝-基质耦合系数、基质渗透率以及裂缝渗透率等因素对产能的影响进行了分析。结果表明,吸附类型、裂缝-基质传导率、油藏具有天然裂缝和基质裂缝渗透率以及压裂增产区域裂缝渗透率可以影响页岩气的生产年限、递减率以及裂缝导流能力,这对页岩气藏水平井进行压裂优化设计具有一定的指导作用。

Shale gas reservoirs have unique characteristics and flow characteristics, therefore its numerical sireulation methods are very different from conventional resestcoirs. Based on the establishment of multi-media model and the discrete analog matrix adsorbed gas and free gas transient flow method, the model of the shale gas reservoir which is volume fractured can be established. On this basis, the influences of the adsorption type, degree of disper- sion matrix cracks-coupling coefficient matrix, matrix permeability, fracture permeability and other factors on pro- duction capacity of the X well are analyied. The results showed that the adsorption type, fracture-matrix conductivity, natural fractures and matrix fracture permeability and fracture permeability also fracture stimulation area for shale can influence the production years,decrement and the fracture flow conductivity, which is a guide role to hori- zontal wells with hydraulic fractures in shale gas reservoirs.