## EXPERIMENTAL STUDY ON VARIABLE MASS FLUID FLOW IN HORIZONTAL WELLS

**Zhou Shengtian Department of Applied Mathematics in the University of Petroleum, China(Dongying: 257062)., Zhang Qi, Li Mingzhong and Wang Weiyang/**

Experimental device is designed and develop for modelling variable mass fluid flow in horizontal wellbore. Variable mass fluid flow of horizontal wellbore perforated and completed is analyzed in laboratory. Data acquisition system is used to obtain a lot of experimental data. The radial inflow through perforations has a great effect on the flow resistance of fluid in the horizontal wellbore. The flow resistance in the horizontal wellbore includes three parts of wall friction loss, acceleration loss and mixture loss. The relationship among mixture loss, main flow velocity and perforation flow velocity is obtained. For constant main flow velocity, mixture loss becomes larger when perforation flow velocity increases, and for constant perforation flow velocity, mixture loss also becomes larger when main flow velocity increases. The wellbore flow becomes complex when inflow through perforation occurs. A simple polynomial regression for experimental data shows that main flow velocity and perforation flow velocity are main factors resulting in mixture loss under given conditions.

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