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目前常采用关井的方法来确定气藏平均地层压力,但是应用该法通常将遇到一些困难。有的井不能关(超高压气井、高产井等);有的井关井时间太长(低渗气藏上的气井),经济损失较大。总的来说,关井会严重地影响气矿和用气单位的生产,如果专门为获得平均地层压力而关井,其代价太大。本文为克服上述困难进行了一些初步尝试,采用系统辨识方法来计算气藏平均地层压力,仅以日常气井生产记录为基本资料,不需要关井测试,无疑具有较高的经济效益和实用性。
At present, the method of shut-in is often used to determine the average formation pressure of a gas reservoir, but the application of this method usually encounters some difficulties. Some wells can not be closed (UHP wells, high production wells, etc.); some well shut-in time is too long (gas wells on low-permeability gas reservoirs), a greater economic loss. In general, shut-in can seriously affect the production of gas and gas units, and it would be too costly to close the well specifically to obtain average formation pressure. This paper attempts to overcome the above difficulties by using some preliminary attempts to calculate the mean formation pressure of gas reservoirs by using the system identification method. Based on the daily gas well production records as the basic data, it is undoubtedly of high economic efficiency and practicality.