Method for oil recovery using a modified heteropolysaccharide

Patent · Tue Oct 17 04:00:00 EDT 1989

OSTI ID:7270390

Robison, P D; Stipanovic, A J

This patent describes a process for recovering hydrocarbons from a subterranean hydrocarbon bearing formation penetrated by an injection well and a production well. It comprises injecting into the formation well an aqueous drive fluid comprising water and more than 50 ppm of of a beta-fluoropyruvate modified NW11 heteropolysacchiaride; forcing the aqueous drive fluid through the formation and recovering hydrocarbons from the production well. Also described is a process for producing a hetropolysaccharide. It comprises: inoculating Xanthobacter sp. strain NW11-ACTCC 53272 into an aqueous fermentation medium containing a carbon and nitrogen source; adding from 0.3 to 3.0 mM beta-fluropyruvate to the fermentation after 0 to 24 hours; incubating the inoculated material at a temperature ranging from 26{sup 0} to 30{sup 0} C. for a period of about 120 to about 170 hours to form a heteropolysaccharide and recovering the polysaccharide.

• Assignee: Texaco Inc., White Plains, NY
• Patent Number(s): US 4874044
• Application Number: PPN: US 7256014A
• OSTI ID: 7270390
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
AQUEOUS SOLUTIONS
CARBOHYDRATES
CHEMICAL COMPOSITION
DISPERSIONS
DISPLACEMENT FLUIDS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
PETROLEUM
POLYSACCHARIDES
RECOVERY
SACCHARIDES
SOLUTIONS
STIMULATION
WATERFLOODING
WELL STIMULATION
WELLS