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• W2592551490 abstract "Abstract Carbonate's extreme heterogeneity in the form of fracture corridors and super-permeability thief zones challenges the efficient sweep of oil in both secondary and tertiary recovery operations. In such reservoirs, conformance control is crucial to ensure injected water and any EOR chemicals optimally contact the remaining oil with minimal throughput. Gel-based conformance control has been successfully applied on both sandstone and carbonate reservoirs. However, in-depth conformance control in high temperature reservoirs is still a challenge, due to severe gel syneresis (expulsion of a liquid from a gel) and the associated significant reduction in gelation time. Recently, we have demonstrated the potential of a selected gel formulation and its favorable impact on sweep efficiency for both water and chemical flooding applications in high temperature and high salinity carbonates (Wang, 2016). In the current work, the performance of polyacrylamide/chromium gel injection followed by water flooding for Arab-D carbonate reservoir rock was closely monitored by 1D T2, spatial NMR T2 mapping and 2D NMR techniques. The NMR measurements before and after waterflooding with and without pre-injection of gel provided the detailed description of spatial oil recovery along the rock core sample under reservoir condition. By comparing the spatial T2 distributions from the experiment with waterflooding and gel injection followed by waterflooding for the core sample with artificial wormhole drilled in the center, which mimics the fluid thief zone, the efficiency of the conformance control by gel was measured. The incremental oil recovery factor of ~14% OOIC after gel injection followed by waterflooding was observed throughout the whole sample with highest recovery in the vicinity of where the wormhole begins near fluid injection inlet. In addition, by analyzing the alteration of spatial NMR T2 and T2-D distribution, the accurate flow paths of the injected water and gel were derived from NMR data. The results of the current study increase the understanding of how gel could helps to increase sweep efficiency of waterflooding and other IOR/EOR applications in the presence of unwanted highly permeable channels in the reservoir rocks." @default.
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• W2592551490 date "2017-03-06" @default.
• W2592551490 modified "2023-10-17" @default.
• W2592551490 title "Close Monitoring of Gel Based Conformance Control by NMR Techniques" @default.
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• W2592551490 doi "https://doi.org/10.2118/183719-ms" @default.
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