Publications

In the development of new fields, the field development scenario is one of the important factors that has a major influence on the economics of the project. The selected development scenarios depend on the production, capital costs and operating costs to be incurred during production. It requires a comprehensive analysis of the engineering and economics of field development strategy in order to get the maximum added value. The difficulties in defining development scenarios that will be reviewed are caused by the almost infinite choice of development options and lack of structured and integrated methods to define offshore field development scenarios. This paper groups several variable selections based on the wellhead type, gas processing facilities and the type of contract that will be applied. Furthermore, the selections will be combined with each other and compared to build scenarios to be evaluated. A case study was also conducted on a marginal offshore gas field located in the Madura Strait, East Java. The small gas reserves that confines this field into the marginal category is a challenge that must be anticipated with development scenario optimization. The field development stage that has entered the process of creating the Plan of Development (POD), made a quite detailed cost analysis that is possible to be implemented. Therefore, a detailed deterministic scenario calculation can be applied for the electoral or selection process with the aim to maximize profits or benefits from the project to be executed. The results of the study showed that grouping development scenarios on an offshore gas field may begin by observing the natural conditions and examine the possible option to tie-in to the existing nearest facilities. Then, It can be combined with the type of wellhead, production facilities and also the type of contract that is applied. The results of the economic calculations show a scenario of dry tree with rental standalone Mobile Offshore Production Unit (MOPU) as the best-case scenario, while the scenario that has a positive economic value is dry tree with tie-in to existing facilities and dry tree with rental standalone Floating Production Unit (FPU). In marginal field development with a ring fencing POD basis, unrecovered cost plays a significant role for development scenario decision-making. That means that a comprehensive economic analysis must be performed to provide a large selection of scenarios with the highest economic value.