Terpolymer composition for aqueous drilling fluids

Patent · Tue Jul 07 04:00:00 EDT 1987

OSTI ID:6306190

Giddings, D M; Williamson, C D

A method is described of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing aqueous oil well drilling fluids which comprises adding a stabilizing amount of a water-soluble terpolymer composition comprising: a polymer prepared by polymerizing the following monomer ingredients; the composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the brown coal or modified brown coal having been presented during the polymerization of the water-soluble polymer. The lignin, modified lignin, brown coal or modified brown coal is from the group consisting of lignites, sulphonated lignites, lignins, leonardites, lignosulfonates, alkali metal humic acid salts, humic acids, and sulphonated humic acids.

• Assignee: Nalco Chemical Co., Oak Brook, IL
• Patent Number(s): US 4678591
• OSTI ID: 6306190
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACRYLONITRILE
ADDITIVES
ALKALINE EARTH METALS
BRINES
BROWN COAL
CALCIUM
CARBOHYDRATES
CARBONACEOUS MATERIALS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CLAYS
COAL
DRILLING FLUIDS
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HUMIC ACIDS
LIGNIN
LOSSES
MATERIALS
METALS
MONOMERS
NITRILES
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLYMERIZATION
POLYMERS
POLYSACCHARIDES
RHEOLOGY
SACCHARIDES
STABILIZATION
SULFONIC ACIDS
SYNTHESIS
TEMPERATURE EFFECTS
WELLS