COMPOSITIONS FOR DRILLING FLUIDS USEFUL TO PROVIDE FLAT TEMPERATURE RHEOLOGY TO SUCH FLUIDS OVER A WIDE TEMPERATURE RANGE AND DRILLING FLUIDS CONTAINING SUCH COMPOSITIONS

摘要

The invention is of oil-based drilling fluids including invert emulsion fluids that are able to maintain a relatively consistent Theological profile over a wide temperature range. The invention also includes new additives that enabl e the preparation of drilling fluids with viscosities that are less affected b y temperature over a temperature range from less than about 40.degree.F to mor e than about 250.degree.F compared to conventional fluids. These additives are base d on reaction products of polyamines and carboxylic acids with two or more carboxylic moieties combined with alkoxylated amines and fatty acid amides. In addition , this invention permits the use of reduced amounts of organoclay Theological additives in drilling fluids.