Amino resin modified xanthan polymer foamed with a chemical blowing agent

Patent · Tue May 16 00:00:00 EDT 1989

OSTI ID:5792322

Hazlett, R D; Shu, P

A method is described for reducing the permeability in an area of a subterranean formation which consists of mixing a gellable composition containing: water, about 0.2 to about 5.0 wt.% of a cross linkable polysaccharide biopolymer having at least one functional group charide biopolymer 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 about 0.02 to about 5.0 wt.% of an aminoplast resin which reinforces the biopolymer thereby causing the polymer to become more thermally stable. Also included are sufficient transitional metal ions to form a gel of a size and strength sufficient to reduce permeability in a more permeable zone in the formation. A chemical surfactant, and an alkali metal salt of azodicarboxylic acid, are then introduced produce a gas sufficient to foam the composition described above. The composition is then injected into the desired area of the formation where the azodicarboxylic acid decomposes thereby generating nitrogen and carbon dioxide gas in an amount sufficient to form a foam which subsequently hardens and reduces the permeability in the desired area.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4830108
• OSTI ID: 5792322
• Resource Relation: Patent File Date: Filed date 4 Jan 1988
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
NATURAL GAS WELLS
FLUID INJECTION
OIL WELLS
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
RESINS
ROCK-FLUID INTERACTIONS
SURFACTANTS
WELL COMPLETION
WELL STIMULATION
WORKING FLUIDS
FLUIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
STIMULATION
WELLS
020300* - Petroleum- Drilling & Production
030900 - Natural Gas- Artificial Stimulation
Plowshare- (-1989)