Abstract
A large-scale hydrocarbon miscible flood has been designed and is being conducted in the Mitsue Gilwood Sand Unit No. 1 in Alberta, Canada. The horizontal miscible flood occurs mostly in previously waterflooded zones and is a true test of the tertiary displacement mechanism. An area of 17,900 acres (7250 ha) is being flooded with a first-contact-miscible (FCM) hydrocarbon solvent followed by a lean chase, gas, both alternated with equal volumes of water. Inverted five-spot injection patterns are used. This paper reviews the evaluation and design process by use of recently developed methodologies, involving innovative laboratory techniques and simulation processes used in planning the miscible flood. Laboratory work was used to develop correlations for determining the hydrocarbon solvent enrichment required for both FCM and multiple-contact miscibility (MCM) as a function of solvent C/sub 2+/ fraction and molecular weight at the reservoir pressure of 2,500 psia (17.2 MPa). Simulation studies indicate that optimum solvent and chase-gas slug sizes of 15 and 25%, respectively, will yield an incremental 12.2% of original oil in place (OOIP), or 21.3 MMSTB (3.4 x 10/sup 6/ stock-tank m/sup 3/). Solvent and chase-gas recoveries were estimated to be 73 and 44%, respectively. Early performance of the miscible floodmore » indicates that the solvent is successfully mobilizing tertiary oil. Wells previously shut in because of high water production have experienced an increase in oil rates and a decrease in WOR's.« less
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