E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/20 (2006.01)
Patent
CA 2739103
Disclosed are methods for improving the production of heavy/viscous crude oil from subterranean formations com-prising secondary production through use of a displacement fluid (typically a waterflood) wherein the subterranean formation is subjected to cyclic periods of overinjection of the displacement fluid followed by underinjection of the displacement fluid, but keeping the overall cumulative voidage replacement ratio (VRR) within a defined range, typically targeted to be about 1. In some aspects, the initial production of such heavy/viscous crude oil is limited, if possible, followed this cyclic secondary production methodology. By keeping the initial production, VRR, and cumulative VRR in defined ranges, the expected ultimate recovery (EUR) can be optimized, and overall production increased for example by as much as 100% or more relative to conventional pro-duction methods.
Linvention concerne des procédés damélioration de la production dhuiles brutes lourdes/visqueuses provenant de formations souterraines comprenant une extraction secondaire au moyen dun fluide de déplacement (habituellement un balayage hydraulique), la formation souterraine étant soumise à des périodes cycliques de surinjection du fluide de déplacement puis à une sous-injection du fluide de déplacement, mais de maintien du rapport de remplacement de désaturation total cumulatif (VRR) dans une plage définie, habituellement ciblée pour être denviron 1. A certains égards, la production initiale de cette huile brute lourde/visqueuse est limitée, si possible, à la suite de cette méthodologie dextraction secondaire cyclique. Le maintien de la production initiale, VRR, et du VRR cumulatif dans des plages définies permet doptimiser la récupération attendue finale (EUR), et daugmenter la production totale par exemple jusquà 100 % ou plus par rapport aux procédés dextraction conventionnels.
Brice Bradley W.
Vittoratos Euthimios
Bp Corporation North America Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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