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Title: Oil recovery by waterflooding employing cross-linked polysaccharides for mobility control

Abstract

A method is described for the recovery of oil from a subterranean formation by waterflooding. The injection medium is an aqueous solution of a viscosifier, the viscosifier being the water-soluble reaction product of an organic polyisocyanate and the addition product of an alkylene oxide and linear, nonionic polysaccharide. The addition product has a molecular weight of at least 100,000. In a preferred form, a polyisocyanate cross-linked hydroxyethyl cellulose is utilized as a viscosifier to decrease the mobility ratio between the injected water and oil, thereby improving the efficiency of the waterflood. The viscosifers have good resistance to the effect of divalent metal ions present in the formation as well as a thermal stability. Aqueous solutions of the viscosifiers have viscosities which are reversible with shear rate. 7 claims.

Inventors:
Publication Date:
OSTI Identifier:
6274380
Patent Number(s):
US 4096074
Assignee:
Mobil Oil Corp.
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 26 Jul 1976
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; DISPLACEMENT FLUIDS; CHEMICAL COMPOSITION; OIL WELLS; WATERFLOODING; CROSS-LINKING; POLYSACCHARIDES; SHEAR; STABILITY; VISCOSITY; WELL STIMULATION; CARBOHYDRATES; CHEMICAL REACTIONS; FLUID INJECTION; FLUIDS; ORGANIC COMPOUNDS; POLYMERIZATION; SACCHARIDES; STIMULATION; WELLS; 020300* - Petroleum- Drilling & Production

Citation Formats

Stournas, S. Oil recovery by waterflooding employing cross-linked polysaccharides for mobility control. United States: N. p., 1978. Web.
Stournas, S. Oil recovery by waterflooding employing cross-linked polysaccharides for mobility control. United States.
Stournas, S. Tue . "Oil recovery by waterflooding employing cross-linked polysaccharides for mobility control". United States.
@article{osti_6274380,
title = {Oil recovery by waterflooding employing cross-linked polysaccharides for mobility control},
author = {Stournas, S},
abstractNote = {A method is described for the recovery of oil from a subterranean formation by waterflooding. The injection medium is an aqueous solution of a viscosifier, the viscosifier being the water-soluble reaction product of an organic polyisocyanate and the addition product of an alkylene oxide and linear, nonionic polysaccharide. The addition product has a molecular weight of at least 100,000. In a preferred form, a polyisocyanate cross-linked hydroxyethyl cellulose is utilized as a viscosifier to decrease the mobility ratio between the injected water and oil, thereby improving the efficiency of the waterflood. The viscosifers have good resistance to the effect of divalent metal ions present in the formation as well as a thermal stability. Aqueous solutions of the viscosifiers have viscosities which are reversible with shear rate. 7 claims.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {6}
}