Selective permeability reduction in a subterranean hydrocarbon-b

Details Selective permeability reduction in a subterranean hydrocarbon-b Selective permeability reduction in a subterranean hydrocarbon-b

1990-12-14

1991-09-17

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166285, 166300, E21B 33138

Patent

active

050486098

ABSTRACT:
Selective permeability reduction is achieved in a heterogeneous treatment zone of a subterranean hydrocarbon-bearing formation by initially placing a nonselective permeability-reducing material in the high and low permeability regions of the treatment zone. Thereafter, a permeability-restoring agent is placed in the regions behind the permeability-reducing material. The agent contacts all of the material in the low permeability region, reacting with it to restore permeability thereto. However, the agent is consumed by reaction before it contacts all of the material in the high permeability region, thereby leaving a sufficient amount of material in the high permeability region to achieve selective permeability reduction therein.

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G. Burrafato et al., "A New, Mild Chemical Method for the Degelation of Cr+3--Polyacrylamide Gel", USMS 019354, Society of Petroleum Engineers, 1989.

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