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
王美楠 1蔡晖 1何新容 1牟春荣 1吴宗勇1
作者信息
- 1. 中海石油(中国)有限公司天津分公司 天津 300459
- 折叠
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.
Abstract
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Key words
ultra-low permeability gas reservoirs/abnormally high pressure/stress-sensitive effect/flow theory/gas well productivity equation/binomial/absolute open flow/productivity assessment引用本文复制引用
基金项目
中海石油(中国)有限公司重大科技专项(CNOOC-KJ 135 ZDXM 36 TJ 01 TJ)
出版年
2024
NETL
NSTL
万方数据