应用气井压力恢复资料确定产能的方法——以靖边气田为例

A method of determinming deliverability with build-up data of gas Wells—an example from the Jingbian gas field

天然气井绝对无阻流量是反映气井潜在产能的重要指标,是科学、合理地确定气井产量的重要依据。气井绝对无阻流量通常由系统试井获得,对于低渗透气藏,用常规的系统试井方法确定二项式产能方程往往比较困难。在对气井产能二项式方程分析的基础上,考虑储层类型及特性对产能试井资料的影响,基于靖边气田20多口气井修正等时试井资料建立了应用压力恢复资料确定气井产能的经验方法,经实例分析,方法可行、有效。

Absolute open flow capacity of gas wells is a key index reflecting potential production capacity of gas wells. It is usually obtained by systematic well testing. For low-permeability reservoirs, however, it is difficult to define binomial deliverability equation through conventional systematic well testing. Based on analyses of binomial deliverability equation for gas wells and influences of reservoir types and characteristics on deliverability testing data, the modified isochronal testing data of over 20 wells in the Jingbian gas field were used to set up an empirical method for determining deliverability with build-up data. Field application shows that this method is feasible and effective.