PECIKO Y-CHANNEL, FIELD CASE OF SUCCESSFUL LIVE AQUIFER BEHAVIOR MODELING TO SUPPORT GAS RESERVOIR MANAGEMENT

摘要

The most common questions for a reservoir engineer are: how much can we produce, for how long and, when will it end? To answer these questions properly, a multi-disciplinary integrated assessment from all geosciences and reservoir aspects is essential. For example, what if, in one particular reservoir, a horizontal well is drilled and put on production, a good seismic attribute shows the geometry of the sand, core and numerous well data reveal its internal architecture, a hydro-geological concept is well established, and water rise monitoring is done periodically? That is when geosciences and production data start to make sense. This paper will demonstrate how an integrated geophysics, geology and reservoir engineering assessment can contribute to successful reservoir management. The gas reservoir is located in the Fresh Water Sand zone of the Peciko Field, Mahakam area. Its appearance on seismic is striking by a clear seismic amplitude anomaly with a 'Y' - like shape. Geological modeling was done with 3D modeling software. Dynamic data was obtained by pressure measurements of newly drilled wells, periodic water rise monitoring from neighboring wells, and production data from the single-gas-producer horizontal well that was put on production in 2009. The goal of static and dynamic assessment was to estimate the water breakthrough time, the well reserves, the maximum recovery factor and the optimum locations for future development wells. The estimated time of water-breakthrough of the single-producer horizontal well is leading to a recovery factor of 36% from the total Initial-Gas-In- Place (IGIP) of the reservoir. Dynamic simulation has increased the understanding of the reservoir production behavior, hence location of possible bypassed gas is disclosed with more confidence. A future horizontal well location has been optimized to increase the recovery factor up to 54%.