Plugging of water-producing zones in a subterranean formation
Patent
·
OSTI ID:7253935
A method of selectively plugging permeable water-producing zones in a subterranean formation of nonuniform permeability comprises 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. 25 claims.
- Assignee:
- Union Oil Co. of California
- Patent Number(s):
- US 4031958
- OSTI ID:
- 7253935
- Country of Publication:
- United States
- Language:
- English
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