Selective placement of a permeability-reducing material to...

Details Selective placement of a permeability-reducing material to... Selective placement of a permeability-reducing material to...

E - Fixed Constructions

21

B

E21B 43/25 (2006.01) C09K 8/512 (2006.01) C09K 8/60 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2086594

2086594 9207168 PCTABS00012 Undesirable fluid flow is inhibited between a near well bore interval and an underlying aquifer in fluid communication therewith. A permeability-reducing material is injected into the near well bore interval and a portion of the material is selectively overdisplaced out into the formation by means of a low density gas subsequently injected into the interval. The gas desirably restores hydrocarbon productivity or fluid injectivity to the interval while the permeability-reducing material remaining in the interval inhibits fluid communication between the interval and the aquifer.

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