Abstract: Since turbulence effect appears near wellbore in oil well with high-speed flow, Darcy's Law for flat radial flow is incompletely applicable. Reference [1] presented the incomplete binomial equation of oil well similar to gas well under the condition of high speed tur bulence effect. Based on that, this paper proposes an easy way to determine binomial equation of well productivity without regard to for-mation static pressure, established by flowing bottomhole pressure and production data as well as linear regression. Using this equation, absolute open-flow capacity can be obtained. Case study shows this method is accurate and reliable for use.

Key words: oil well, binomial, productivity, well test, equation