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一般的钻杆测试(DST)是打开地层生产一段短时间后,就进行关井测压力恢复。本文将完全依据DST的生产测试特点,把流动期和压力恢复期视为受不同井筒存储效应影响下的连续的地层不稳定渗流过程:从而引入一个井筒存储比例因子Fd,建立整个渗流过程的数学模型,并利用有限差分法求解;研制出了用于分析整个DST压力历史的新型典型曲线。新型曲线的应用避免了常用方法中的多解性问题,提高了解释精度。最后,本文用实例分析说明了新型曲线的应用方法。
A typical drill pipe test (DST) is to shut-in the measured pressure recovery after a short period of time after the formation is opened. Based on the DST production test, this article considers flow periods and pressure recovery periods as a continuous process of instability seepage under the influence of different wellbore storage effects: a wellbore storage scaling factor Fd is introduced to establish the mathematical of the entire seepage process Model and solved by finite difference method. A new typical curve for analyzing the history of the entire DST pressure was developed. The application of the new curve avoids the problem of multiple solutions in common methods and improves the precision of interpretation. Finally, this paper illustrates the application of the new curve by example analysis.