Optimization of a Saldanadi gas field of Bangladesh

Abstract

In this study, three software (MBAL, PROSPER & GAP) are used to calculate different important parameters for "Saldanadi gas field optimization study". A systematic reservoir engineering investigation which is extremely important for the development of a gas field is conducted to get insight information of the reservoir and production system. In the present work, MBAL software calculation is used to estimate the total gas in place of Saldanadi gas field which is 114.96 BCF. In October 2010, the cumulative production of the field is 62.321 BCF. Thus the overall gas in place recovery of the field is 54%. PROSPER is most common software for the petroleum industry which can assist the production or reservoir engineer to predict tubing and pipeline hydraulics and temperatures with accuracy and speed that is also used to compare the measured gas rate. In the case, it is found that the measured gas rate and software calculated gas rate are almost similar and the result variations are less than 7%. The production optimization depends upon several parameters such as well stimulation, tubing size, flow line size, chock size, separator pressure and average reservoir pressure. The impacts of each parameter are also observed to identify any bottle-neck in the production system. GAP analysis approach has been followed in conducting the system analysis to optimize production of Saldanadi Gas Field. Different separator pressure is also investigated because it has a great influence in the flow period and flow rate. From the study, it is found that with the increase of separator pressure the flow period decreases i.e. the recovery of gas decreases. Various types of production tubing inner diameter is also used to find the great influence on the flow period and flow rate of gas. In this case, when production tubing inner diameter decreases then the gas flow rate also decreases but flow period of gas production increases i.e. recovery of gas increases.