应力敏感特低渗气藏绝对无阻流量计算新方法  

A new method for calculating absolute open flow rate of stress sensitive ultra-low permeability gas reservoirs

作　　者：王美楠 蔡晖 何新容 牟春荣 吴宗勇 WANG Meinan;CAI Hui;HE Xinrong;MU Chunrong;WU Zongyong(CNOOC China Limited Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《油气井测试》2024年第1期67-71,共5页Well Testing

基　　金：中海石油(中国)有限公司重大科技专项“渤海油田强化水驱及增产挖潜技术”(CNOOC-KJ 135 ZDXM 36 TJ 01 TJ)。

摘　　要：为准确评价特低渗气藏产能,推导考虑应力敏感效应的气井产能方程,建立了特低渗气藏绝对无阻流量计算新方法。通过产能方程左端项数值与产气量的线性关系,确定方程系数A和B,建立考虑应力敏感效应的气井产能方程和绝对无阻流量计算公式,提高特低渗气藏产能预测精度。经S气藏A1、B1、B2井现场应用,相比于忽略应力敏感影响,应力敏感的气井绝对无阻流量下降19%,设计产能精度达到90.4%和95.0%,表明应力敏感效应对气井产能影响较大。新方法更适用于特低渗气藏的产能评价,具有较大的推广应用价值。In order to accurately assess the productivity of stress-sensitive ultra-low permeability gas reservoirs,a productivity equation for gas wells considering the stress-sensitive effect was derived,and a new method for calculating absolute open flow in such reservoirs was established.By establishing a linear relationship between the numerical values of the left-hand side of the productivity equation and the gas production,coefficients A and B were determined.Then,a productivity equation for gas wells considering stress-sensitive effects and a formula for calculating absolute open flow were established,which enhanced the productivity predicting accuracy in ultra-low permeability gas reservoirs.The new method was applied to wells A1,B1,and B2 in the S gas reservoir.Compared to cases where stress-sensitive effects are ignored,the absolute open flow in stress-sensitive gas wells decreased by 19%,and the designed productivity accuracy exceeded 90.4%and 95.0%,indicating a significant impact of stress-sensitive effects on gas well productivity.The new method is more suitable for evaluating the productivity of ultra-low permeability gas reservoirs,which holds a significant promotion and application value.

关 键 词：特低渗气藏 异常高压 应力敏感效应 渗流理论 气井产能方程 二项式 绝对无阻流量 产能评价 

分 类 号：TE373[石油与天然气工程—油气田开发工程]