Melamine/formaldehyde cross-linking of polymers for profile control

Patent · Tue Nov 29 04:00:00 EST 1988

OSTI ID:6338975

Mitchell, T O

This patent describes a process for closing pores in a more permeable zone of a hydrocarbonaceous fluid bearing formation to obtain improved sweep efficiency prior to a waterflood oil recovery operation wherein the process comprises injecting into the formation of a gelable composition comprising: (a) water; (b) 0.2 to 5.0 wt. percent of a cross-linkable polymer having at least one functional group selected from a member of the group consisting of an amine, an amide, a hydroxyl, or a thiol group; and (c) 0.1 to 5.0 wt. percent of a methylol containing aminoplast resin which cross links with the polymer, thereby forming a gel of a size and strength sufficient to close pores in one or more permeable zones of the formation, the resin having amine and aldehyde in a critical mole ratio of from about 1:6 to about 1:30 respectively, which ratios are sufficient to form substantially improved stable gels for utilization in a subterranean formation during the recovery of hydrocarbonaceous fluids.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4787451
• OSTI ID: 6338975
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALDEHYDES
AMINES
AZINES
CARBON DIOXIDE INJECTION
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COLLOIDS
CROSS-LINKING
CRYSTAL STRUCTURE
DISPERSIONS
DISPLACEMENT FLUIDS
FLUID INJECTION
FLUIDS
FORMALDEHYDE
GELS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
MELAMINE
MICROEMULSION FLOODING
MICROSTRUCTURE
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PERMEABILITY
POLYMERIZATION
POROSITY
RESERVOIR ROCK
SWEEP EFFICIENCY
TRIAZINES
WATER
WELLS