"单点法"产能测试具有时间短、放空气量小的优点,但对低渗气藏,气井生产达到稳定需要很长时间,因此通过短时间测试确定的产能误差很大,不能准确评价气井的实际生产能力。以回压试井理论和渗流叠加原理为基础,提出了\"回压等时试井\"产能评价方法,该法所需测试时间与\"单点法\"大致相同,但能较准确地评价低渗气井产能。通过模拟井资料的检验,证明回压等时试井结果可靠。

The single-point potential test has two merits. One is that in needs a short test time. Another is that the quantity of relief gas is  small. But it will cause a great error in evaluating a low permeability gas well productivity because the gas well will cost a long time to reach a pseudo steady  state. To resolve the problem, based on backpressure test theory and superposition principle, this paper designed a new test method, named Backpressure Isochronal Test. It can accurately evlauate the productivity of gas wells with low permeability in a short test time which approximately equals to the time the  single-point method needs. The analysis and contrast of analog wells reveal that the result is reliable.