Improving Exploitation Strategy Through Dynamic-Oriented Reservoir Characterization

Jai K. Negi¹, Aditya Kumar², and U.S. Prasad^2
1ONGC, DehraDun, India
²Reservoir Division, KDMIPE, Dehradun

Matured reservoirs can be described as those reservoirs which have touched their production peak and are now in a state of decline. Rudrasagar field typically can be described as a matured or brownfield. More than 40 years in the production, the field still offers significant opportunity as it still holds vast reserves in it (barriers in the field behind which oil could be trapped or unswept areas because of reservoir heterogeneity). The most common data that is available in abundance in a mature reservoir are Production data. They are often the definitive source of information about reservoir heterogeneity and internal compartmentalization. Early water breakthrough conversely delay in some parts of the field, with respect to the general advance of the water front are frequently related to the existence of reservoir heterogeneities. To track fluid front through animation of production history data, application of geostatistics was invoked. The production history maps have given good account of the behavioral patterns of Oil, Water-Cut and GOR over the years. These maps have helped in locating unswept and watered out areas. To increase recovery efficiency, suitable exploitation strategy can be developed. This type of study is complementary to the static models of porosity and permeability, which provide type and location of heterogeneity but not its effectiveness with respect to fluid flow.

Presentation GEO India Expo XXI, Noida, New Delhi, India 2008©AAPG Search and Discovery