Methodological Approach To Modeling The Results Of Geochemical Studies Of Wells For The Western Siberian Fields

Abstract Objectives/Scope: Controlling the extraction of reserves during development and localizing the remaining recoverable reserves are crucial tasks facing the oil and gas industry, determining the efficiency of hydrocarbon deposit development. To address this challenge, a methodology for geochemical separation (distribution) of oil production by layers in wells with combined layer operation in the Western Siberian fields has been developed. Methods, Procedures, Process: The methodology includes three main stages: the selection of equipment and analysis methods to ensure production separation, the pilot industrial operation stage to refine the technology, and the industrial operation stage to achieve the set goals. One of the primary tasks is localizing hydrocarbon reserves to improve development process management efficiency. This task is addressed using a hydrodynamic model adapted to the production history of wells, taking into account geochemical data on production separation by layers. The methodology is based on creating maps of redistribution coefficients of oil production by layers, their interpolation into areas not covered by geochemical analysis data, and recalculating oil production from data obtained under technological regimes to production obtained using interpolated coefficients for all wells of the developed object. Results, Observations, Conclusions: The developed methodology for production separation and model adaptation was tested on a section of 50 wells in a three-layer system of the Priobskoye field in Western Siberia. The obtained coefficients not only enabled high-quality adaptation of development indicators using the hydrodynamic simulator T Navigator but also allowed for reassessment of maps of residual mobile reserves of layers. Additionally, a comparison was made between the results of geochemical oil production separation and those obtained using field-geophysical studies, with a relative error of no more than 8%, yielding satisfactory results in matching current and forecasted development indicators (deviation not exceeding 10%). The model also demonstrated good predictive capability when comparing forecasted parameters with actual performance of a new well launched in the block. Novel/Additive Information: This publication presents innovative methods and methodologies for modeling. A new simple approach to modeling production separation by layers based on geochemical well studies is proposed. The methodology concludes that repeated adaptation of the model to the “geochemical history of oil production” can lead to significant changes in the localization of residual oil reserves. Based on the successfully conducted verification of geochemical study data with independent methods, the quantitative convergence of results and the promising application of the production separation method by layers are demonstrated, leading to the continuation of technology implementation with the transition to the industrial operation stage.