E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
164/33
E21B 43/24 (2006.01)
Patent
CA 1227126
METHOD TO DIVERT STEAM FOR THERMAL RECOVERY PROCESS ABSTRACT The sweep efficiency of a steam flooding process is significantly improved if steam is injected into the lower portion of the formation via an injection well and fluid including oil is produced from the formation via a production well until steam channeling or steam overriding has occurred, after which steam injection is terminated and a predetermined amount of an oxygen- containing gas such as air, oxygen-enriched air, or oxygen is injected into the formation which oxidizes the residual oil in the portion of the formation where steam override or channeling has occurred forming an asphaltic material in that zone that increases the permeability of that zone. Thereafter, steam injection is resumed and as a consequence of the oxidized asphaltic material plug, the steam moves into portions of the formation to mobilize viscous oil not swept by the initial injection of steam. During injection of the oxygen-containing gas production of oil may be terminated or continued, however if production is continued, the rate of gas injection is higher than if the production well is shut-in. Multiple cycles of steam and oxygen-containing gas injection may be applied to a formation to better control sweep efficiency. The process may be applied using an oxygen-containing gas or a mixture of steam and an oxygen-containing gas.
455246
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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