Method for selectively reducing subterranean water permeability

Details Method for selectively reducing subterranean water permeability Method for selectively reducing subterranean water permeability

E - Fixed Constructions

21

B

E21B 33/138 (2006.01) C09K 8/50 (2006.01) C09K 8/60 (2006.01) E21B 43/25 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2098829

2098829 9211440 PCTABS00014 Gels containing gas precursors and/or pathways are used to selectively reduce the flow of aqueous fluids with respect to the flow of nonaqueous fluids to enhance the recovery of the nonaqueous fluids from subterranean formations. The gels, while stable at reservoir conditions, are also readily degraded by gel degrading agents such as acids and therefore are also employed as fail-safe gels in subterranean gel treatments. In another embodiment, selective permeability is restored to a previously treated well by injecting a gas into the previous treated portions of the subterranean formation to displace any aqueous fluid obstructing the passage of the nonaqueous fluid through the polymer-coated pores or gel.

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