رضا آذین

production rate of a reservoir and thus can control formation draw down. A choke is basically designed with small opening which can prevent erosion problems and a leaking master valve which may killing the well to replace the valve. The main idea of using a choke is to maintain a sufficient back pressure for a reservoir to prevent formation damages such as gas or water coning and sand entry. The filed being studied in this project, located in Persian Gulf coastline, is a gas condensate reservoir. Since, no flow meter is installed on the wells the individual flow rate of each well is not available. But total flow rate of two platforms which is cumulative production of twenty wells’ flow rate is known instead. And, since it is necessary to determine each well’s production rate in order to analyze production data and predict the future of production, Pipesim simulator was used to simulate choke valve and calculate the gas and condensate flow rate of each well. Having opening percentage instead of bean size in adjustable chokes is a challenging issue in calculating production rate. Therefore, 77 data points of test separators were collected to simulate the choke and to obtain an applicable relation between the choke opening percentage and the bean size. At the end, total calculated enriched gas flow rate was compared to total measured enriched gas flow rate and consequently mean percentage error of 3.4 was obtained.