开井期间抽汲求产对压恢曲线试井分析的影响

Influence of Swab for Acquiring Production During Open Well Time on Testing Analysis of Build-Up Pressure Curve

抽汲求产是一个很复杂的间歇生产过程,对应的压力恢复曲线试井解释方法有别于自喷井定产量模型,尤其当抽汲周期产量波动较大时,解释结果往往将产生较大误差。经研究分析发现,如果开井期间根据抽汲周期实测产量变化情况划分多个流动段,即采用自喷井变产量迭加方法对压力恢复曲线进行拟合分析,则可以近似模拟抽汲求产情况,降低解释误差。经两口井资料处理,均获得较好效果,解决了以往采用自喷井单流量模型解释明显不合理的问题,达到了准确评价储层的目的。

Swab for acquiring production is a complex intermission producing process. Interpreting method for build-up pressure curve corresponding to that is not similar to stable production model for flowing well, especially when production in swabbing period fluctuates heavily, the result has much errors. By research and analysis, it is found that if several flowing periods have been classified in terms of actual production during opening time, that is using superposition method of changeable production in flow well to imitate and analyze build-up pressure curve, swabbing for acquiring production situation could be simulated approximately, decrease interpreting errors. By data process for results of two wells, good effects have been gained and problem of interpretation being unreasonable obviously when anciently using single flow model in flowing well has been solved to attain objective of evaluating reservoir accurately.