低渗透气藏水平井产能动态预测模型研究  

RESEARCH ON THE DYNAMIC PREDICTION MODEL OF HORIZONTAL WELL PRODUCTIVITY IN THE LOW-PERMEABILITY GAS RESERVOIR

作　　者：余传谋[1] 张聚[2] 

机构地区：[1]中原油田分公司采油二厂 [2]中原油田分公司采油工程技术研究院

出　　处：《钻采工艺》2013年第2期65-68,79,共5页Drilling & Production Technology

基　　金：国家油气重大专项(编号:2008ZX05010-003)资助

摘　　要：气藏生产过程一般分为两个阶段:定产降压和定压降产,且真实气体的PVT参数随压力变化。针对气藏的生产特征,基于稳定渗流理论,以气体高速非达西渗流为基础,考虑真实气体的PVT随压力的变化,结合气藏物质平衡方程,推导建立同时考虑滑脱效应、启动压力梯度、应力敏感等因素共同影响的低渗气藏水平井产能动态预测模型,并通过实例分析了各因素对气井产能变化规律的影响。结果表明,启动压力梯度和渗透率变形系数越大,气井稳产期减小幅度越大,而滑脱因子越大,气井稳产期增加幅度越大,同时考虑高度非达西效应时,气井稳产期减小;气藏非均质性越强,气井稳产期减小幅度越大,而水平井长度越大,气井稳产期增加幅度越大;采气速度和井底压力越大,气井稳产期减小幅度越大,前者产量递减速度越快。The production process of gas reservoirs usually consists of two stages: pressure drop at constant rate and production decline at constant pressure, and the real gas PVT parameters change with pressure changes. In view of the production characteristics of the gas reservoirs, based on the steady seepage theory, considering the real gas PVT parameters with pressure changes, combining the material balance equation, a dynamic prediction model of the horizontal well productivity was established for the low-permeability gas reservoirs which considering the influence of the start-up pressure gradient, slippage effect and stress sensitivity, and the productivity characteristic was discussed by analyzing and calculating examples. The results showed that the bigger the start-up pressure gradient and deformation coefficient of permeability, the more decreasing extent of the stable production period, while the more slippage effect, the more increasing extent of the stable production period, and considering the high speed non-Darcy, the stable production period would decrease. The bigger the heterogeneity, the more decreasing extent of the stable production period, while the more length of the horizontal well, the more increasing extent of the stable production period. The bigger the gas production rate and bottom hole pressure, the more decreasing extent of the stable production period.

关 键 词：低渗透气藏 水平井 气体PVT 物质平衡方程 动态预测 

分 类 号：TE328[石油与天然气工程—油气田开发工程]