E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/24 (2006.01)
Patent
CA 2046792
ABSTRACT OF THE DISCLOSURE IMPROVING PERMEABILITY OF FINES-CONTAINING EARTHEN FORMATIONS BY REMOVING LIQUID WATER A method is disclosed for improving the effectiveness of fluid transport in a petroleum reservoir. That method comprises increasing the permeability of a portion of the reservoir by removing liquid water from that portion by evaporating off the liquid water. Preferably, substantially all of the liquid water is removed. In one embodiment, the liquid water is evaporated off by heating the portion to a temperature above the boiling point of water for the ambient pressure of the portion. In another embodiment, the liquid water is evaporated off by injecting into the reservoir a gas (such as heated nitrogen) that is undersaturated with respect to water. In a third embodiment, steam is injected into a well within the portion, and the steam is blown down to vaporize substantially all of the liquid water and to cause the vaporized water to leave the portion. In still another embodiment, superheated steam is injected into the reservoir. Prior to the evaporation in any of those embodiments, nitrogen or natural gas can displace a fraction of the liquid water from the portion of the formation.
Chevron Research And Technology Company
Sim & Mcburney
LandOfFree
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