| Popis: |
The initial hydrocarbon (Oil and Gas) in-place represents the asset volume of ADNOC that is required estimation at high accuracy level with minimum uncertainties to avoid any future risks with fields' development plans. Moreover, accurate estimation of the reserves that can be produced during the field life cycle is critical as it is directly impact the CAPEX and OPEX of different field development phases. Fields developments are usually selected based on the techno-economic evaluations of the outcome from the full field simulation studies using representative models. Accordingly, management decision for fields' development is totally dependant on the accuracy of the used simulation models. Worldwide, there are many simulation models successfully demonstrating good history match profiles, nevertheless, several of these models are utilizing unsupported parameters, such as representative capillary pressure and relative permeability curves. In addition to the adverse impact on the predictive reliability, massive convergences problems that are encountered and participating in slowdown the models performance and decreasing accuracy. Subsequently, incorrect Long Term Development Plans "LTDP's" profiles will be generated. Therefore, in order to ensure achieving more representative asset volume estimates, a new procedure has been setup, established and successfully validated through different fields. The main objectives of the new procedure are to enhance model initialization with minimum gap in terms of hydrocarbon-in-place between the static and the dynamic models below the range of 1.0 %, to achieve more accuracy of the expected movable oil and gas with respect to water flooding (Current Development Plan) and future Gas/WAG flooding (LTDP), to eliminate high risk of assessment of modeling the actual gas/water breakthrough timing, recovery factor, sweep efficiency and fields measured matching parameters, and to cut down potential risks of under/over estimating the water/gas influx fronts in the reservoir. Quality match is essential in order to prevent utilization of non-measured parameters such as irreducible water saturation (Swc's), also to eliminate utilization of unproven permeability multipliers. Moreover introducing a new capillary pressures (Pc) designing concept will contribute in reducing convergences problems as well as providing more consistent dynamic model setup (dynamic model rock typing). Based on the results from several simulation studies which were introduced to the new procedure framework, the new procedure managed to demonstrate its capability to design the most reliable capillary pressure profiles. These profiles are essential for simulation models to ensure quality match of lateral and vertical oil and gas distribution in the field which represents the most extremely improvement match achieved when compared with other used method. |
