Increasing the permeability of a subterranean reservoir

Patent · Tue Feb 04 04:00:00 EST 1986

OSTI ID:6131453

Watanabe, D J

This patent describes a retarded acidizing composition for treating the matrix around a well completed in a subterranean hydrocarbon-producing reservoir having a temperature of up to about 400/sup 0/F. The composition consists of a solution of: (a) a proton-carrying mutual solvent comprising a tertiary carboxylic acid alkylated amide; (b) at least about 5 percent by weight of a water-soluble acid selected from the group consisting of low molecular weight organic acids, hydrochloric acid, hydrofluoric acid, mixtures of hydrochloric acid and water-soluble ammonium fluoride or bifluoride salts, and mixtures thereof; and (c) about 100 to about 10,000 parts per million by weight of a water-soluble polymer having a molecular weight of 10,000 to 25,000,000 and selected from the group consisting of polyacrylamide and partially hydrolyzed polyacrylamide. The solution contains proton-carrying mutual solvent in an amount about 0.5 to 2.5 equivalents per equivalent of water-soluble acid.

• Assignee: Union Oil Company of California, Los Angeles, CA
• Patent Number(s): US 4567946
• OSTI ID: 6131453
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACIDIZATION
AMIDES
AMMONIUM COMPOUNDS
AMMONIUM FLUORIDES
BARYONS
CARBOXYLIC ACIDS
DISPERSIONS
ELEMENTARY PARTICLES
FERMIONS
FLUORIDES
FLUORINE COMPOUNDS
HADRONS
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MIXTURES
NATURAL GAS WELLS
NUCLEONS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PERMEABILITY
PROTONS
QUANTITY RATIO
SOLUBILITY
SOLVENTS
STIMULATION
WELL STIMULATION
WELLS