Gas Condensate Flow Through Chokes

In this study, field data from a gas condensate reservoir located in the Middle East are used to develop some empiricial correlations that describe the behaviour of gas condensate flow through chokes. The data cover wide ranges of flow rates and choke sizes. Four forms of correlation are checked against data. One of the forms is to correlate choke upstream pressure with liquid production rate, gas liquid ratio and choke size. The second form is developed by using gas production rate instead of the liquid rate in the previous form. The other two forms are developed by using the pressure drop across the choke instead of upstream pressure. These correlations are presented in graphical forms. Five error parameters are used to check accuracy of the different forms. Namely: root mean square error, mean absolute error, simple mean error, mean percentage absolute error and mean percentage error. It was found that the correlation is most accurate when using pressure drop data instead of choke upstream pressure in the correlation. The importance of the developed correlations lies in the fact that correlations for gas-condensate systems are not available. Also such correlations will help the production engineer to a great extent in selecting choke sizes to control production of gas-condensate wells and predicting the performance of flowing wells under different conditions.