Core cleaning and aging effects of devonian carbonate core at micro scale

A carbonate core from Timan-Pechora oil and gas province study of some core cleaning and aging procedures on composition and structure of a pore space-mineral fringe are an important task for reserves evaluation and oil recovery modeling. Oil mineral skeleton interaction at micro scale characteristics provided by modern methods of electron microscopy and spectroscopy, that have allowed to extend a traditional petrophysic core data of reservoir properties and wettability. The Devonian Timan-Pechora carbonates hydrocarbon films and chemical bonds analysis novel data was obtained by a XPS technique taking into account pore volume structure, films microscopic structure and chemical behavior at calcite mineral surface. Carbonate rock cleaning and aging procedures impact was carried out. The evaluation of the influence of the extractant type on the intensity of the impact on the rock and the regimes of aging and storage of the core on the microstructural parameters of the sorption of hydrocarbon films on the surface of the void space made it possible to develop recommendations for preserving the character of the wettability of the initially hydrophobic carbonate rocks for further petrophysical experiments and the development of an EOR. The hydrophobic carbonates wettability characteristic preservation recommendations proposed basing on hydrocarbon films microstructure sorption on mineral surface parameters. A water hydrophobic carbonate rock interaction conclusions were proposed basing on data correlation about carbon chemical bond types, microstructural studies, water microdrops dynamic condensation on rock surface analysis combined with reservoir properties and pore volume distribution parameters about the hydrocarbon films sorption and impact. This type of rocks data clarifying practices for EOR forecasting proposed.