Abstract: When processing of data from single-point test, the value of αis generally taken by 0.25 for calculating the open flow potential of gas well, and the result is far from that from modified isochronal test. This paper deduced the relationship between α and other related parameters using data from single-point test in non-steady state, by which the accurate open flow potential of gas well is then gained for its proper value of α. The case study indicates that such a method is more reliable than before, and provides more precise bases for further open flow potential estimation and proration measures implementation.

Key words: single-point test, modified isochronal test, open flow potential, method