Developing Optimum Production Strategy Of Kailashtilla Gas Field And Economic Analysis

This study focuses on the utilization of integrated production optimization of Kailashtilla Gas Field (KGF), Bangladesh. KGF has a current production rate of 60 MMscfd gas with three producing wells. According to a previous study in 2009 by RPS Energy, gas initially in place of this field was 3.54 Tcf. However, only 640 Bcf gas has been produced over the last 30-year period from 1983 to 2014. Only 39.39% recovery is achievable using the present field production strategy over next 25 years. The ultimate goal of this study is to discover an optimum field development strategy to increase the production from KGF. The proposed augmentation program is based on recovery factor, plateau, and economic outcome. The tasks have been divided into well modeling, reservoir modeling, and surface facility modeling. Finally, some cases studies and economic analysis have been done including net present value and benefit-cost ratio. This study involves reservoir, wells, and surface facilities in an integrated model to investigate different field development strategies. Effect of changing production systems such as upgrading separator, changing tubing size, lowering separator pressure, and adding new well in the system have been studied. This study estimates total reserve of this field as 3.013 Tcf by material balance method from three sand layers: Upper Gas Sand (UGS), Middle Gas Sand (MGS), and Lower Gas Sand (LGS). Comparative analysis of the various prediction cases with economic analysis suggests three optimum field development strategies for next 25 years as follows: (a) drilling one new well in UGS and one in MGS with 180 MMscfd plateau; (b) drilling two new wells in UGS with 180 MMscfd plateau; and (c) changing the tubing size of existing two wells with 120 MMscfd plateau. Current study yields a maximum recovery of 63.02% from UGS, 80.03% from MGS, and 79.0% from LGS by implementing the recommended development strategies.