Oil and oil invert emulsion drilling fluids with improved anti-settling properties

摘要

This invention is of a drilling fluid composition containing a liquid thixotrope, which thixotrope is free of solvents or any other diluent, and is in easily usable, liquid form, pourable at ambient temperatures, and which provides effective and efficient rheological properties when used at low levels in such compositions.;The invention discloses new drilling fluids, particularly useful as oil or oil invert drilling muds, which are distinguished by improved anti-settling properties, high ecological acceptability, and at the same time good storage and application properties. An important area of application for the new drilling fluid systems is in both on and offshore wells for the development of hydrocarbon deposits, the aim of the invention being particularly to make available industrially usable drilling fluids with enhanced anti-settling properties that provide satisfactory performance over wide ranges of shear and temperature.;In a specific aspect, the invention provides an oil or oil invert emulsion drilling fluid composition containing one or more organoclays, and in addition contains a additive which comprises the reaction product of an alkoxylated nitrogen containing compound or a diamine, and one or more polycarboxylic acids in a specified equivalent ratio.