The development of oil and gas fields in recent years has become more technically and economically challenging. Interdisciplinary interaction is needed to have effective and efficient field planning. Indeed, it has been noted that field management by using integrated surface-subsurface modeling will have an extremely positive effect on production.

This paper presents the interdisciplinary teamwork between subsurface and surface engineering in their efforts to construct an integrated production model for Kaji Semoga field, a large and complex onshore production field located in South Sumatra, Indonesia. The model covers about 180 wells, which are spread over 45 clusters, and surface facilities in three field processing stations. It covers all facilities from well up to the nearest field station for separating gas from oil and for compressing it prior to distributing to clusters and finally injecting the well. The model also incorporates 84 new ESP, which will be installed by the end of year 2009 to replace the existing gas lift system.

The model predicts an additional oil gain of 2,500 bopd (14.7%) as a result of installing ESP. About 170,000 blpd of liquid will be produced after the ESP installation project is completed. Consequently, liquid handling in each station has become a critical issue to be resolved before all the ESPs are installed. Several operational manoeuvers have been carried out to handle the forthcoming produced liquid by utilizing the model. About 300 bopd (1.8%) of oil gain from the cluster flow diversion scenario has already been realized.

Apart from the liquid handling issue, the model also highlights the future gas-lift gas requirement for the remaining gas lift wells. Several active compressors can be shut down as a result of the outcome of the model, so the operating cost can be reduced significantly. The model also identifies potential bottlenecks along the production trunkline, which can result in a potential reduction of 140 bopd. In addition, the model also identifies a potential oil gain of about 220 bopd (1.3%) if back pressure on several production trunklines can be minimized.

Field engineers have benefitted from the use of this model: it can help them assess any changes or manoeuvres in the field. This is expected to add about 200 bopd (1.2%). Some of these changes and manoeuvres are being executed this year.

You can access this article if you purchase or spend a download.