engleski

Increased hydrocarbon recovery and CO2 management, a Croatian example with PVT relations and volumes

Due to additional oil and gas production, the pilot project of alternating water and carbon dioxide injection, performed on limited part of the Ivanić Field (the Sava Depression) has proved feasibility of the EOR (Enhanced Oil Recovery) project (VRBOŠIĆ et al., 2003 ; PERIĆ & KOVAČ, 2003 ; NOVOSEL, 2010). Further modeling of sandstone reservoirs in order to calculate volumes available for CO2 injection was done. First phase modelling was related to results of laboratory testing on the core samples. Analogies with world-known projects of CO2 geological storage were also applied (BENNACEUR et al., 2004 ; CHADWICK et al., 2002 ; MARTENS et al. 2012). Further modelling was made by using the Ordinary Kriging technique. It covered variogram analyses of reservoir variables (porosity, depth and reservoir thickness) and their mapping with the purpose of determine reliable average values of the Upper Pannonian reservoir volumes. Consequently, the volume of CO2 expressed at standard condition, which can be injected in the “Gamma 3” and the “Gamma 4” reservoirs (supporting miscible conditions) is approximately 15.5 billion m3.

carbon dioxide ; enhanced oil recovery ; Ordinary Kriging technique ; reservoir variables

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