Method for acidizing subterranean formations

Patent · Tue Jan 17 04:00:00 EST 1978

OSTI ID:6512541

Hessert, J E; Bertus, B J

Gelled acidic compositions suitable for either matrix acidizing or fracture-acidizing of subterranean formations and methods of using the compositions in acidizing operations are described. The compositions consist of water, a water-dispersible biopolysaccharide, an acid, a water soluble compound of a polyvalent metal wherein the metal can be reduced to a lower polyvalent state, and a reducing agent capable of reducing the metal. The metal in the lower polyvalent state serves as the crosslinker for the polymer. The biopolysaccharide is xantham gum, the chromates and dichromates are examples of a reducible polyvalent metal, and the bisulfites and thioacetamide are examples of reducing agents. (19 claims)

• Assignee: Phillips Petroleum Co
• Patent Number(s): US 4068714
• OSTI ID: 6512541
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACIDIZATION
CARBOHYDRATES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CROSS-LINKING
DISPERSIONS
ENHANCED RECOVERY
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
POLYMERIZATION
POLYMERS
POLYSACCHARIDES
RECOVERY
SACCHARIDES
WELLS