Method and composition for acidizing and fracturing wells

Patent · Tue Dec 02 04:00:00 EST 1975

OSTI ID:7362053

Dill, W R

A method is claimed of acidizing or fracturing subterranean formations comprising injecting into the formation, a composition consisting essentially of a stable acidic gel made by the process of adding from about 25 to about 150 pounds of a linear polyacrylamide having a molecular weight of from about 1 to about 50 million to each 1000 gallons of an aqueous hydrochloric acid solution containing from about 25 to about 35 weight percent of hydrochloric acid. In another method of practicing the invention, the viscosity of the gelled acid is increased prior to injection into the formation by adding to the gel, an aldehyde compound soluble in aqueous solutions. An amount of the aldehyde equivalent to from about 0.01 to about 1.5 weight percent of aldehyde (based on the weight of hydrochloric acid used) is employed. Where this method of practicing the invention is used, the starting acid solution may have a concentration as low as 1 weight percent.

• Assignee: Halliburton Co.
• Patent Number(s): US 3923666
• OSTI ID: 7362053
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030900 -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
ACIDIZATION
ALDEHYDES
COMMINUTION
ENHANCED RECOVERY
FRACTURING
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
NATURAL GAS WELLS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYAMIDES
POLYMERS
WELL STIMULATION
WELLS