修正等时试井资料解释改进方法对比

Comparison of Improved Interpreting Methods of Modified Isochronal Well Test Data

相比标准的产能试井,修正等时试井操作性更强,普及范围更大,应用程度更高。低渗透产水气井修正等时试井常规资料处理时,会出现二项式产能曲线斜率为负值或相关系数低的现象。为此,采用稳定流压(p_(wf))改进法、关井压力(p_(ws))改进法、压差(Δp^(2))取值改进法三种方法,从理论分析、计算方法、实例验证等方面对其进行了对比,明确了适合苏里格气田D区产水气井修正等时试井资料解释改进方法,结果认为p_(ws)改进法因地层原因(渗透性差、污染等)导致关井恢复压力较低时运用效果不理想,而Δp^(2)改进法、pwf改进法对于产水井或积液井修正等时试井资料解释具有很好的应用效果。该修正等时试井资料处理思路及方法可直接应用于同类型气藏,指导气田开发方案编制等,现实意义大。

Compared with the standard productivity test,modified isochronal test has stronger operability,wider popularization and higher application degree.As known,the present situation that the slope of binomial deliverability equation curve of water-producing gas well is negative or the correlation coefficient is low obtained by using conventional data processing method.In order to solve the problems,the paper has compared 3 interpreting methods from the aspects of theoretical analysis,calculation method,case application,etc.As a result,the optimized method is got applying to water-producing gas well in Sulige Gasfield D Block.The results show that the application effect of the improved shut-in pressure method is not ideal when the shut-in recovery pressure is low due to formation reasons( poor permeability and pollution,etc.),while the improved pressure difference method and the improved steady flow pressure method have a good application effect on the interpretation of the isochronal well test data for the correction of producing well or liquid accumulation well.The modified isochronal well test data processing ideas and methods can be directly applied to the same type of gas reservoirs,guiding the preparation of gas field development plan,etc.