Miscible WAG injection has been implemented in a number of oil fields around the world and there are a number of numerical studies investigating the effect of rate, gravity, slug size and heterogeneity on WAG performance. However there are very few laboratory studies of WAG sweep efficiency reported in the literature. In this paper we report the results from a series of well-characterized WAG displacements through glass bead-packs. The aim of these experiments was: to investigate the impact of first contact miscible WAG injection on sweep efficiency to clarify the physical processes during displacements. to provide benchmark data-sets that could be used in performing reservoir simulations. The use of bead-packs rather than cores enabled us to observe visually, the fluid interactions during each WAG experiment. A series of secondary, miscible WAG displacements were conducted at WAG ratios of 1:1, 1:2 and 2:1. These were performed at a constant flow rates to eliminate the influence of capillary number on sweep efficiency. Results indicate that sweep efficiency is a function of the WAG ratio. Empirical equations of area sweep as function of mobility ratio for various WAG ratio's are obtained. Results of this work will provide additional information that will be very valuable in performing numerical and analytical miscible flooding models.
|Number of pages||13|
|Publication status||Published - Dec 1 2004|
|Event||SPE Asia Pacific Oil and Gas Conference and Exhibition, 2004 APOGCE - Perth, Australia|
Duration: Oct 18 2004 → Oct 20 2004
|Other||SPE Asia Pacific Oil and Gas Conference and Exhibition, 2004 APOGCE|
|Period||10/18/04 → 10/20/04|
ASJC Scopus subject areas