Results of numerical experiments to establish the influence of drawdown degree on gas and condensate recovery factors

Abstract

As the title implies the article presents the results of the analysis of static models of multiple correlation of the gas recovery factor from geological and technological factors. It is shown that one of the main technological factors that determine the value of the gas recovery factor is the differential pressure drawdown, established in the technological modes of well operation. We have analyzed the reasons for the deviation of the actual and design development indicators (a case study of the Northern Nishan gas condensate field). We considered variant calculations of the field development indicators with a constant well stock, but differing in the drawdown in the wells, and concluded that the maximum value of the gas recovery factor of 82.3 % is achieved with drawdown of 5 MPa. It is shown that as the differential pressure drawdown increases, the gas recovery factor decreases and with a drawdown of 17.5 MPa it is only 39 %, which is confirmed by the actual field development indicators.