Drilling mud additive

Patent · Tue May 12 04:00:00 EDT 1987

OSTI ID:6534104

Halliday, W S; Thielen, V M

A processor is described for drilling a borehole that encounters a water-sensitive shale, with the borehole being drilled by operating a drilling means, and circulating therein a drilling fluid, when the encountering of borehole instability due to the interaction of the water and water-sensitive shale is at least imminent, circulating as the drilling fluid an aqueous brine solution that contains from about 0.2 to about 2.0 pounds of an additive per barrel. The additive comprises: 27% by weight of a partially hydrolyzed polyacrylate-polyacrylamide copolymer having a molecular weight of at least three million and which is from about 20 to about 50% hydrolyzed; and 70% by weight of potassium chloride.

• Assignee: Newpark Drilling Fluid Inc., Houston, TX
• Patent Number(s): US 4664818
• OSTI ID: 6534104
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ADDITIVES
ADSORPTION
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BOREHOLES
BRINES
CARBOHYDRATES
CAVITIES
CELLULOSE
CHLORIDES
CHLORINE COMPOUNDS
COPOLYMERS
DISPERSIONS
DRILLING FLUIDS
ESTERS
FLUIDS
GROUND WATER
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INSTABILITY
MIXTURES
MOLECULAR WEIGHT
NATURAL GAS WELLS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYACRYLATES
POLYAMIDES
POLYMERS
POLYSACCHARIDES
POLYVINYLS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
ROCKS
SACCHARIDES
SEDIMENTARY ROCKS
SHALES
SOLUTIONS
SORPTION
VISCOSITY
WATER
WELLS