低渗透气藏双重渗流耦合流动的产能方程  

Productivity equation of dual flow coupling seepage in low permeability gas reservoirs

作　　者：熊健[1] 郭平[1] 王平 倪小龙 陈艳茹[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]新疆油田公司第二采油厂,新疆克拉玛依834008

出　　处：《大庆石油学院学报》2011年第5期25-29,115,共5页Journal of Daqing Petroleum Institute

基　　金：国家科技重大专项(2008ZX005056-02-02-03);国家重点实验室开放基金项目(PLN-05ZL002)

摘　　要：针对低渗透气藏的特征,基于稳定渗流理论,建立低渗透气藏气体在远井区渗流和近井区渗流的耦合流动的气井产能预测模型,包括远井区考虑启动压力梯度和滑脱效应的气井产能方程,以及近井区考虑高速非达西效应的气井产能方程.研究结果表明:启动压力梯度和高速非达西效应使气井产量下降,且随着启动压力梯度的增大,气井产量不断降低;增产措施和滑脱效应使气井产量增大,且随着滑脱因子的增大,气井产量不断增加;在高流压阶段,启动压力梯度对气井产量影响显著,而在低流压阶段,高速非达西效应和滑脱效应对气井产量影响逐渐增强,同时滑脱效应在开发后期有利于气井产量提高.In view of the characteristic of low permeability gas reservoir,based on the steady seepage theory,a gas well productivity prediction model with coupled flow seepage in the distant wellbore and near wellbore region was established,including the gas well deliverability equation of actuating pressure gradient and slippage effect in the distant wellbore region and the deliverability equation of high speed non-Darcy flow effect in the near wellbore region.The findings indicate that the gas well production decline is caused by actuating pressure gradient and high speed non-Darcy flow effect;and along with actuating pressure gradient enlargement,the gas well production continues to decline.Both stimulation and slippage effect lead to increases in gas well production,and along with slippage factor enlargement,the gas well production continues to increase.In the high flowing pressure stage,actuating pressure gradient has remarkable effect on gas well production.While in the low flowing pressure stage,high speed non-Darcy flow effect and slippage effect is more obvious,especially for slippage effect,which is beneficial to production of gas well at the late stage of production.

关 键 词：低渗透气藏 启动压力梯度 滑脱效应 高速非达西 双重渗流特征 耦合流动 产能方程 

分 类 号：TE312[石油与天然气工程—油气田开发工程]