Process for enhanced delayed in situ gelation of chromium polyacrylamide gels

Patent · Tue Dec 03 04:00:00 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): A; US 5069281
• Application Number: PPN: US 7-609490
• OSTI ID: 5666792
• Country of Publication: United States
• Language: English

Related Subjects

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