高压气井产能评价方法研究

确定气井产能有回压试井、等时试井与修正等时试井，这些方法所需的试井时间长，且增加勘探成本。此外，高压气井试井时开井期井底压力常出现上升现象，有时出现油嘴大（产量高）井底流压也大的现象，导致不能建立产能方程，从而得不到绝对无阻流量。因此，研究高压气井产能评价方法有其必要性。

High-pressure gas well productivity evaluation

There were three methods determining gas well productivity, whi ch are back pressure testing, isochronal testing and modified isochronal testing . These methods all need a long testing time, which can lead to the increase of exploring cost and the waste of resource. For these reasons, a new method determ ining gas well absolute open flow by using transient well testing data is studie d in this paper. Taking Well KL203 as an example, the efficiencies of using seve ral kinds of method to calculate gas well absolute open flow rate, such as binom ial pressure method, binomial pressure squared method, exponential pressure met hod, exponential pressure squared, one point pressure method, one point pressur e squared method and new one point pressure squared method have been compared. Se veral conclusions were given as below: pressure method is more suitable for calc ulating high pressure gas well productivity than pressure squared. Under the c on dition that productivity well test has been made, the binomial pressure method i s more suitable for calculating absolute open flow. Under the condition that onl y transient well test has been made or productivity testing has been made but th e pressure difference per unit production are not correlated or negatively corre lated with production, the new one point pressure is suitable. If all other meth ods are all unsuccessful, the one point pressure method can be used approximatel y.