大庆油田试井分析过程中两个问题的探讨

Discussion on Two Problems in Well Testing Analysis in Daqing Oil Field

对试井分析过程中的流量和时间取值问题,从流动时间与压力叠加以及有效时间和最终流量2个角度进行了分析,指出使用变流量、叠加时间和使用最终流量、有效时间得到的试井分析结果是一致的,联合采用有效流动时间和最终产量,能使复杂的问题得到简化,并且不失其准确性;从理论根源上对外推压力这一问题进行了分析,指出进行Horner压力恢复分析时必须考虑流动期间压力特性对于恢复压力曲线形态的影响,不同的生产流动特性会产生不同的外推压力,外推压力不是一个真实的压力值,其大小完全是任意的。这些分析和认识对大庆油田试井技术的应用和发展有积极的意义。

This paper studies the problem of value choosing for flow rate and time in well testing analysis process in terms of flow time and pressure superposition and effective time and final flow rate.It indicates that using variable flow rate and superposition time has same analysis result with using final flow rate and effective time.Combined application of effective time and final production can simplify complicated problems and ensure accuracy.This paper analyzes the problem of extrapolated pressure in terms of theoretical root,showing that Horner pressure buildup analysis must consider the effect of pressure characteristic in flowing process on restoring pressure curve form.Different production flow characteristics may produce different extrapolated pressure.Extrapolated pressure is not a true pressure value,and its value is completely arbitrary.