An Experiment in History Matching of the Multi- Reservoir Hydrodynamic Model of the Nydinsky Section of the Medvezhye Field

Introduction. History matching of a multi-layer model, where several layers are combined into one object and developed using a unified well grid, is complicated by the mutual influence of parameters (porosity, aquifer volume and intensity, permeability, productivity) on reservoir pressure, balance of production from the producing layers, and advancement of the water front. A change in any of the adjustable parameters of one layer entails a change in the controlled parameters of all interconnected layers.
Materials and research methods. The model of the Lower Cretaceous gas condensate deposits of the Nydinsky section of the Medvezhye deposit is a multi-layer one. The development objects consist of 3-4 layers. Each object is developed by an independent grid of wells. Each deposit is layer-uplifted, flooding occurs in the lateral direction. The analysis by the P/z method was carried out, according to the results of which the effect of the water pressure regime on the 2nd and 4th development site is observed, which must be reproduced in the model. Also, this method can indirectly indicate the amount of drained reserves.
Research results and their discussion. The configurable parameters for history matching are: reservoir pressure, the front of the reservoir water advance, gas production profiles for each well based on the PGI using a flow meter. The setting of the initial inflow profile is reproduced based on the results of the primary GIS. The correspondence of the inflow profiles of further GIS should be ensured by the correct distribution of the initial gas reserves across the layers inside the operational facility. Further, while maintaining the balance of the inflow profile, the formation pressure and the water advance front are adjusted by iteratively changing the volume and intensity of the aquifer and the pore volume.
Conclusions. The algorithm for history matching of a multi-layer model, in which several layers are developed by a single grid of wells, should begin with adapting the inflow profile to the initial date. Further redistribution of the production profile should occur iteratively due to the balance of reserves of deposits, volume and intensity of the aquifer, while taking into account the front of the advance of reservoir waters based on the results of observations on the well stock. Adjusting the inflow profile by changing kh is not recommended, since changing the inflow profile over time is most often not the function of kh. At the same time, it is necessary to take into account the mutual influence of the above parameters of one formation on all other layers inside the operational facility.

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