Reservoir simulation of Haripur gas field to analyze the field performance by production and pressure history matching

Abstract

Well-7 of Haripur gas field was spud in 1986 by BAPEX. After 07 years of uninterrupted oil production, the well ceased its production on 14th July, 1994. The 1st work over of Sylhet well -7 was completed in March 2005. This well was recompleted in lower Bokabil sand as gas producer with an initial production capacity of 15MMCFD. The gas production was ceased again in July 2008. The 2nd work over has been successfully completed in the existing perforation zone on February 2, 2010. Commercial gas production started from Sylhet-7 with an average production 6-8 MMSCFD with about 2100 psig well head pressure. In this study, material balance, production data analysis (PDA), pressure transient analysis (PTA) and reservoir simulation are conducted to understand the different reservoir information and predict future production performance. This study uses Material balance analysis tool MBAL, Well model software PROSPER, PDA tool TOPAZE, PTA tool SAPHIRE and commercial reservoir simulator CHEARS to find out reservoir characteristics, pressure and production history matching of producing sand of Haripur gas field. This study estimates initial gas in place, recoverable reserves and remaining reserves of producing sand of Haripur gas field. Current study has yielded the gas initial in place of 24 BSCF of lower Bokabil (sand-D) sand which is close to Petrobangla recent study by RPS Energy. Permeability and skin factor of this formation are investigated by pressure transient analysis. No re-estimation of reserve for the other sands is conducted in this study.