低渗透油藏压裂水平井井筒与油藏耦合的非稳态模型  

A Coupling Model of Low Permeability Reservoir and Fractured Horizontal Wellbore in Nonsteady State

作　　者：廉培庆[1] 程林松[1] 曹仁义[1] 黄世军[1] 

机构地区：[1]中国石油大学(北京)石油天然气工程学院,北京102249

出　　处：《计算物理》2010年第2期203-210,共8页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(90210019);教育部高等学校博士学科点专项科研基金(20060425001)资助项目

摘　　要：推导低渗透各向异性油藏压裂水平井井筒与盒式油藏耦合的非稳态模型,并给出求解方法.模型考虑摩阻和加速度的影响,并可以使用不同类型的约束条件.实例计算表明,压裂水平井的流动可分为非稳态阶段和拟稳态阶段.在非稳态阶段,各条裂缝的产量相差不大,总产量随着裂缝条数的增加呈线性增加;在拟稳态阶段,两端裂缝产量高于中部裂缝的产量.受摩阻和加速度压降的影响,空间上位置对称的裂缝在流量上呈现不对称性.井筒内压力损失的存在将使水平井的产量降低,并使井筒内的压力分布不均匀.在最小井底流压的基础上固定流量时,裂缝条数越多,稳产期也越长.An unsteady model of fractured horizontal wellbore coupling with a box-shaped reservoir is constructed with consideration of anisotropy in a low permeability reservoir. Solution of the model is shown. Pressure drops of friction and acceleration are considered under different types of constraints. Flow condition in fractured horizontal well is divided into early transient period and pseudo-steady period. In transient period, the output from each fracture differs little, and total production rate increases linearly with fracture number. In pseudo-steady phase, production rate of fractures at the toe and heel is higher than that in the middle. Fractures in symmetrical position have different yield due to frictional and accelerational pressure drops. Pressure loss along the wellbore results in decrease of production in horizontal well and non-uniform distribution of pressure in wellbore. Under constant flow rate followed by constant bottom-hole pressure constraints, production plateau stays longer with increase of fracture number.

关 键 词：水平井 非稳态 压降 裂缝 

分 类 号：TE312[石油与天然气工程—油气田开发工程]