A New Equation for the Determination of a Well Drainage Area in Naturally Fractured Reservoirs

摘要

In reservoir study, the relationship between the reservoir performances and well bore is a key for any well completion design and well production optimization. In order to estimate the behavior of reservoir pressure with different production flow rates, the well drainage area is necessary. The well drainage area is estimated from well test under pseudo-steady-state production when the change of reservoir pressure with time is constant. The MBH method is used to estimate well drainage area and its shape in conventional reservoirs. But for the case of naturally fractured reservoirs, a small amount of research has been done on the determination of well drainage area and shape. There are a few limited methods to determine the drainage area of a well in naturally fractured reservoirs that have been presented in recent years. The authors compare the available methods with a new developed equation for determination of the drainage area of a well in naturally fractured reservoir. The presented new equation is easy to apply and it has high accuracy.