Process for enhanced delayed in situ gelation of chromium polyacrylamide gels

Patent · Tue Dec 03 00:00:00 EST 1991

OSTI ID:5666792

Tackett, Jr, J E

This patent describes a process for selectively plugging high permeability regions in a subterranean hydrocarbon-bearing formation penetrated by a well bore in fluid communication with the high permeability regions. It comprises: predetermining a gelation delay time required to place an aqueous gelation solution into the high permeability regions; preparing at the surface the aqueous gelation solution comprised of a polyacrylamide polymer containing less than about 0.1 mole% polymer carboxylate groups, a delaying agent, an aqueous solvent, a buffer, and a polyvalent metal carboxylate crosslinking agent capable of crosslinking polyacrylamide; injecting the aqueous gelation solution in the high permeability regions via the well bore; gelling the aqueous gelation solution in the high permeability region after the gelation delay time to reduce the permeability of the region.

• Assignee: Marathon Oil Co., Findlay, OH (United States)
• Patent Number(s): US 5069281; A
• Application Number: PPN: US 7-609490
• OSTI ID: 5666792
• Resource Relation: Patent File Date: 5 Nov 1990
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
OIL WELLS
ENHANCED RECOVERY
WELL STIMULATION
GELS
DRILLING FLUIDS
GEOLOGIC FORMATIONS
HYDROCARBONS
PERMEABILITY
PLUGGING
POLYACRYLATES
POLYAMIDES
COLLOIDS
DISPERSIONS
ESTERS
FLUIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
RECOVERY
STIMULATION
WELLS
020300* - Petroleum- Drilling & Production