考虑启动压力梯度及滑脱效应的气井产能主控因素分析  

Analysis on the Deliverability of Gas Well Influenced Simultaneously by the Threshold Pressure Gradient and Slippage Effect

作　　者：张跃磊[1] 李治平[1] 李光涛[1] 李琴[1] 任广磊[1] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083

出　　处：《石油天然气学报》2011年第11期146-149,10,共4页Journal of Oil and Gas Technology

基　　金：国家油气重大专项(2011ZX05002-005)

摘　　要：为了明确低渗透气藏垂直裂缝气井产能如何同时受启动压力梯度和滑脱效应的影响,应用保角变换的方法,建立了考虑启动压力梯度与滑脱效应的垂直裂缝气井非达西产能方程,并应用该产能方程对启动压力梯度及滑脱效应如何同时影响气井产能规律进行了分析。结果得出:①启动压力梯度对产能来讲为负效应,起到降低产能的作用;而滑脱效应为正效应,起到提高产能的作用。②启动压力梯度与滑脱效应同时存在时,在低生产压差阶段,启动压力梯度所起的负效应起主要作用,产能降低;在较高生产压差阶段,滑脱效应所起的正效应增强,可强于负效应,使产能增加。因此,建议在气井产能分析过程中,应视条件侧重考虑两种因素对产能的影响。To clear how the gas well's deliverability is influenced simultaneously by the threshold pressure gradient and slippage effect,using conformal transformation principle,non-Darcy productivity equation has been established which has included the threshold pressure gradient and slippage effect.And the discipline is analyzed that how the threshold pressure gradient and slippage effect influence the gas well's deliverability.Concluded that:①the threshold pressure gradient is a negative effect,which reduces the production,and the slippage effect is a positive effect,which enhances the production;② if the threshold pressure gradient and slippage effect exist at the same time,in the stage of low production-difference,negative effect caused by the threshold pressure gradient plays a major role,and the production reduces;in the stage of high pressure-difference,positive effect caused by the slippage effect play a main role,and production rises.So an advice has been proposed that the two factors should be focused on considering,according to the conditions during the procedure of analysis on deliverability.

关 键 词：垂直裂缝 滑脱效应 启动压力梯度 主控因素 产能变化率 产能分析 

分 类 号：TE37[石油与天然气工程—油气田开发工程]