Plugging of water-producing zones in a subterranean formation

Details Plugging of water-producing zones in a subterranean formation Plugging of water-producing zones in a subterranean formation

1975-06-13

1977-06-28

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166292, E21B 33138

Patent

active

040319580

ABSTRACT:
A method of selectively plugging permeable water-producing zones in a subterranean formation of nonuniform permeability comprising sequentially injecting into the formation (1) an aqueous solution of a first reactant material rendered more viscous than the subsequently injected liquids by the addition of a viscosity increasing agent, (2) a low viscosity inert aqueous spacer liquid, (3) a low viscosity aqueous solution containing a second reactant material which, on contact, will react with the first reactant material to produce an insoluble precipitate, (4) a low viscosity inert aqueous spacer liquid and (5) an additional amount of the aqueous solution of a first reactant material, which aqueous solution is optionally rendered more viscous than the previously injected aqueous solution containing the second reactant material by the addition thereto of a viscosity increasing agent.

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