Full field reservoir simulation has been adequate for reservoir management purposes for more than a decade long production history of the Statfjord Field in the North Sea. At the present stage, the beginning of production decline, the simulation strategy needs to be changed. A full field model would be unmanageably large if the geological detail needed to understand the issues relevant to further recovery enhancement is included. Most of the remaining reserves will be recovered by sidetracking and infill drilling. The remaining oil has then to be mapped carefully using both the geological information obtained during these years together with a reliable history matching. In this paper, a methodology has been developed for history matching regions with very detailed geology, while taking into account the interaction with the whole reservoir. The method involves writing to a history file the fluxes between the cells at the boundaries of the regions of interest and the rest of the reservoir. This methodology has been tested for the Statfjord Field. The CPU-time was reduced by 35 percent compared to a conventional method. The insights obtained were achieved in a shorter time. The fluid flow processes are better represented and the reservoir description obtained is more representative. Furthermore, the element model is now run in prediction mode as a tool for reservoir management and planning well activities. Thus a new simulation strategy, based on history matched, geologically detailed element models and preserving the interaction with the whole reservoir, has been proved useful.

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