Increasing the injectivity index and productivity index of wells

Patent · Tue Mar 14 04:00:00 EST 1972

OSTI ID:6218066

Kirk, W B

The injectivity index and productivity index are increased by: (1) injecting into the hydrocarbon-bearing formation about 1 to 500 gal of micellar dispersion per vertical ft of the formation, followed by; (2) injecting about 1 to 500 gal of a mobility buffer per vertical ft of the formation; (3) injecting a displacing fluid to substantially displace the micellar dispersion to a radius of at least about 7.5 ft from the well bore; and (4) injecting a fluid to increase the reduced permeability caused by the mobility buffer. The mobility buffer can be an aqueous solution containing a partially hydrolyzed, high molecular weight polyacrylamide. The displacing fluid can be water and the fluid following the displacement fluid can be an aqueous solution containing about 0.1 to 30% of sodium hypochlorite--the sodium hypochlorite increases the relative permeability of the formation that was adversely affected by the polyacrylamide. (14 claims)

• Assignee: TUL; EDB-81-114485
• Patent Number(s): US 3648774
• OSTI ID: 6218066
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACRYLAMIDE
ALKALI METAL COMPOUNDS
AMIDES
BUFFERS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INJECTION
INTAKE
MICELLAR SYSTEMS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PETROLEUM
POLYMERS
PRODUCTIVITY
SODIUM COMPOUNDS
STIMULATION
WELL COMPLETION
WELL STIMULATION
WELLS