修正等时试井与短期试采有机结合应用探讨

A Discussion on Application of Combination of Modified Isochronal Test and Short Period Production Test

松辽盆地徐家围子断陷高产气井,区域储层特点为致密储层,试采生产中井底流压连续下降无稳定点,只通过修正等时试井不能准确给出气井无阻流量。在短期试采结束后,增加采后测关井恢复资料,选用修正等时试井与短期试采有机结合,用生产压差倒数寻找流压下降速率相同点,结合试采后关井恢复资料解释参数;应用不稳定IPR曲线预测无阻流量检验修正等时试井的二项式无阻流量,提高了短期试采时给出的无阻流量准确性。

There are a lot of high gas rate wells in Xujiaweizi Fault Depression of Songliao Basin.The reservoir is very tight.During production test the bottom hole flowing pressure continues to decrease and can not stabilized and so the open flow potential(OFP)cannot be determined by modified isochronal test.After production test,we shut-in the well,measure build-up data,use reciprocal of producing pressure differential,combine the results of modified isochronal test and production test,to find out the point where the flowing pressure decreasing with the same speed,and then calculate the parameters by pressure build-up data,calculate the OFP from transient IPR curve to verify the OFP calculated from modified isochronal test,and thus so to make the OFP from production test more accurate.