E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/39
E21B 43/24 (2006.01) E21B 43/26 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1323561
ABSTRACT 605500 A process is disclosed for achieving thermal communication and areal conformance in a weak uncemented tar sand formation between at least one injection well and at least one production well penetrating said formation, which comprises (1) steam stimulation of said at least one production well by injection of steam for a time and at a volume and pressure sufficient to drive steam into said oil-bearing formation in the vicinity of said well, (2) terminating injection of steam to said at least one production well and producing fluids from said at least one production well while maintaining back pressure on said well to prevent substantial revaporization of steam condensate forming part of said fluids, until the bituminous fluid production rate is below an economically acceptable value, (3) when the stress state favors horizontal fracturing, injecting a high viscosity fracturing fluid at said injection well at a rate and for a sufficient time to propagate horizontal fracturing from said injection well to said at least one production well, (4) immediately subsequently injecting steam through said injection well at a rate and at a pressure necessary to promote material failure in said formation and which will decrease to less than overburden pressure while still in a state of net overinjection and producing steam condensate and bitumen at said at least one production well for a time sufficient to establish fluid communication and heated areal conformance between said injection well and said at least one production well. A process is also disclosed for the production of bitumen from a weak tar sand formation which comprises the additional steps of (5) reducing the rate of injection of steam at said injection well below that of said rate of production of fluids from said production well until the proportion of bitumen in said fluids from said production well decreases below a predetermined level, and (6) increasing the rate of injection of steam at said injection well to increase the reservoir pressure at which the steam flood is occurring and condense vapours formed during step (5).
605500
Borden Ladner Gervais Llp
Esso Resources Canada Limited
LandOfFree
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