Drilling fluids

Patent · Tue Dec 31 04:00:00 EST 1991

OSTI ID:5594561

Hale, A H; Blytas, G C; Dewan, A K.R.

This patent describes a method for drilling a well. It comprises rotating a drill string to cut a borehole into the earth; circulating a drilling fluid through the drill string and through the annulus between the drill string and the wall of the borehole; checking the drilling fluid for evidence of shale dispersion from the wall of the borehole into the drilling fluid; and adding alcohol and partially hydrolyzed polyacrylamide to the drilling fluid in an amount sufficient to reduce the shale dispersion, the alcohol being selected from the group consisting of an alcohol of less than 8 hydroxyl groups and less than 16 carbon atoms; an acyclic polyol having 3 to 80 carbon atoms and 2 to 60 hydroxyl groups; a monoalicyclicpolyol having 5 to 30 carbon atoms and 2 to 10 hydroxyl groups; and a cyclicetherpolyol having 6 to 1800 carbon atoms, 2 to 450 hydroxyl groups, and 2 to 600 ether linkages.

• Assignee: Shell Oil Co., Houston, TX (United States)
• Patent Number(s): A; US 5076373
• Application Number: PPN: US 7-671987
• OSTI ID: 5594561
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040300* -- Oil Shales & Tar Sands-- Drilling
Fracturing & Mining
ACRYLAMIDE
ALCOHOLS
AMIDES
ANNULAR SPACE
BITUMINOUS MATERIALS
BOREHOLES
CARBONACEOUS MATERIALS
CAVITIES
CHEMICAL REACTIONS
CONFIGURATION
DECOMPOSITION
DISPERSIONS
DRILLING
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HYDROLYSIS
HYDROXY COMPOUNDS
LYSIS
MATERIALS
OIL SHALES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
ROCKS
SEDIMENTARY ROCKS
SHALES
SOILS
SOLVOLYSIS
SPACE
WALLS
WELL DRILLING