均质油藏试井资料极值拟合分析方法研究

Extreme value study on well testing in homogeneous reservoir

压力导数峰值点包含着丰富的油藏信息。对均质油藏试井模型的压力解进行二次求导,可以得到压力导数极大值与CDe2S(CD为无因次井筒储集系数,S为表皮系数)的对应关系,再进行回归,就可获得压力导数峰值和峰值出现时间与CDe2S的线性关系表达式。应用这些关系,提出一套通过确定试井资料压力导数极值来求取CD和S的方法,提供一种实现典型曲线拟合的方便有效的方法。图1表1参2(邹冬平摘)

The pressure derivate extreme value indicates abundant reservoir information. This paper deduced corresponding relation of pressure derivate extreme value and C De 2S ( C D is dimensionless wellbore storage factor, S is skin factor) by twi derivating pressure of well test in homogeneous reservoir and presented the relation formula of pressure extreme value with C De 2 S and time extreme value with C De 2 S . By the equations, wellbore C D and skin S may be obtained. With the solution type curve can be matched efficiently.