US 5,399,269 A · Gelation of water soluble polymers

Abstract

A gelable composition and process are disclosed that delay the gelation and increase the gel strength of gelled water soluble acrylamide-containing polymers contains: (1) a water dispersible first crosslinking compound selected from the group consisting of p-aminosalicylic acid, furfuryl alcohol, RArOC(O)R' and HOArC(O)OR" wherein Ar represents a phenyl group which can be substituted or non-substituted; R is a hydrogen or a carboxylic group; R' is a C.sub.1 -C.sub.6 alkyl; R" is a hydrogen, a phenyl group, or a C.sub.1 -C.sub.6 alkyl; and when R is a carboxylic group, R and C(O)OR" can be at ortho, meta, or para position with respect to the OC(O)R' group and the OH group, respectively; (2) a water dispersible second crosslinking compound selected from the group consisting of aldehydes and aldehyde-generating compounds; (3) a water soluble acrylamide-containing polymer; and (4) water.

Claims34

Dependent claims

A composition comprising:

(1) a water dispersible crosslinking compound selected from the group consisting of p-aminosalicylic acid, RArOC(O)R' and HOArC(O)OR", and combinations thereof;
wherein Ar represents a phenyl group which can be non-substituted or substituted;
R is hydrogen or a carboxylic group;
R' is a C.sub.1 -C.sub.6 alkyl;
R" is hydrogen, a phenyl group, or a C.sub.1 -C.sub.6 alkyl;
and when R is a carboxylic group, R and C(O)OR" can be at ortho, meta, or para position with respect to the OC(O)R' group and the OH group, respectively;
(2) hexamethylenetetramine;
(3) a water soluble acrylamide-containing polymer;
and (4) water.

6 more elements

A process for reducing the permeability of watered-out or oil-depleted zones in a high temperature subterranean formation comprising injecting a composition into said formation which forms a gel in said formation wherein said composition comprises:

(1) a water dispersible crosslinking compound selected from the group consisting of p-aminosalicylic acid, RArOC(O)R' and HOArC(O)OR" wherein Ar represents a phenyl group which can be non-substituted or substituted;
R is hydrogen or a carboxylic group;
R' is a C.sub.1 -C.sub.6 alkyl;
R" is hydrogen, a phenyl group, or a C.sub.1 -C.sub.6 alkyl;
and when R is a carboxylic group, R and C(O)OR" can be at ortho, meta, or para position with respect to the OC(O)R' group and the OH group, respectively;
(2) hexamethylenetetramine;
(3) a water soluble acrylamide-containing polymer;
and (4) water.

5 more elements

Dependencies are inferred from the claim text.

Gelation of water soluble polymers

Life of this patent

Gelation of water soluble polymers

Life of this patent

Abstract

Claims34