气井产能分析数据处理新方法

在常规方法处理产能测试数据时,发现许多气井的井底压力测试数据很难达到常规气井产能分析方法的基本要求:每改变一个工作制度(每改变一次产量),气井的井底压力达到稳定后测试压力,连达到“拟稳定流状态”都比较难。使得测试压力与达到稳定时的压力有一定的误差,针对这种情况,提出一种新的数据处理方法,该方法引入两个平均误差值来处理其测试数据,通过测试数据就获得其误差值,从而获得可靠的结果。该方法主要用来处理由于在测试过程中流动未达稳定状态造成测试的地层压力或测试压力不准确的影响,而使得测试数据异常,用常规方法无法处理的数据。该方法克服了测试中需要长时间达到稳定状态这一限制,对异常资料的处理特别实用。通过实际资料处理与对比分析验证了该方法实用可靠。

A NEW METHOD TO PROCESS WELL TESTING DATA FOR GAS WELL

When we analyzed the gas well deliverabilty, we found that the observed bottom hole pressure data scarcely meet the stable requirement. That is to say, when the gas rate is changed, the observed bottom hole pressure is not the desired stable pressure data. In order to get high quality“stable”pres-sure data, a new method to process well testing data is present-ed in this paper, which treat the well testing data by introduc-ing two average errors. The new method is used to process the abnormal pressure data duo to unstable flow condition, which overcome the limit that well testing take long time to get stable bottom hole pressure data. The results from real case studyshow that the new method is practical.