Reserve estimation and well performance study of Salda Nadi gas field

Abstract

Salda Nadi Gas Field is situated about 40 km north of Comilla town. Bangladesh Petroleum Exploration and Production Company Limited (BAPEX) discovered Said a Nadi Gas Field. A total of two wells, one as a duel producer were developed. Gas production started in March 1998. In this study a thorough reservoir engineering investigation has been conducted to get insights into the reservoir and production system. Reserve estimation is important for the development of a gas field. In this study, volumetric analysis and flowing material balance method have been used to estimate the reserve. Flowing material balance method is helpful to estimate initial gas in place without loss of production. Pressure transient analysis and deliverability testing give valuable information about reservoir characteristics. Well performance depends upon well and reservoir conditions. The pressure transient analysis determines the wellbore storage, skin factor, permeability etc. of the reservoir. The overall performance of any well depends upon the combination of well 1l1flow performance, down-hole conduit flow performance and surface flow performance. The production optimization depends upon several parameters i. e. well stimulation, tubing size, flow Iine size, choke size, separator pressure and average reservoir pressure. The impacts of each parameter have been observed to identify any bottle-neck in the production system. Nodal analysis approach has been followed in conducting the system analysis to optimize production of Salda Nadi Gas Field. This study reveals that the lower zone of the reservoir may have been damaged during the drilling and/or completion processes. The upper zone of well # I is being produced with over-sized tubing. Well # 2 is producing at optimum condition