Abstract: An oil soluble invert emulsifier and a process for preparation thereof, including invert emulsion drilling fluid compositions and their use, are described. The oil soluble invert emulsifier is synthesized from fatty acid reaction with polyalkylene polyamines and unsaturated mono carboxylic acids. The emulsifier is further modified with multivalent alkali metal salts. The emulsifier stabilizes the invert emulsion drilling fluid at temperatures exceeding 400° F. and imparts improved fluid properties.

Abstract: This invention relates to an apparatus and method for vacuum packaging drilling fluid additives and is particularly effective for low bulk density material. Vacuum sealing technology is employed to decrease the volume of the additive, thereby enabling packaging of larger quantity of additive per bag, effective utilization of storage space and reduced transportation costs. The invention overcomes the drawback of conventional vacuum packing machines where the material being packaged drifts out of the packaging bag into the vacuum chamber on vacuum creation and further deposits on the sealable portion at the open end of the bag leading to ineffective sealing of the bag opening. The apparatus of the invention is modified to increase the headspace between the sealing element of the apparatus and drilling fluid additive being sealed, thereby eliminating the movement of the additive into the vacuuming chamber and deposit on the bag opening.

Abstract: Solid free-flowing powdered drilling fluid additives compositions having desirable emulsifying, wetting and other performance characteristics are described. Their method of preparation and their use in oil-based drilling fluid compositions are described. The manufacturing process comprises of contacting (spraying or mixing) different types of liquid invert emulsion additives individually at elevated temperature with a blend of inert fillers in specific proportions and of particular particle size in a blender for a specified time. The solid powdered additives thus obtained are controlled pulverized to obtain the final particle size which does not alter the performance of each individual additive. The solid invert emulsion additives obtained are added to drilling fluid compositions yielding drilling muds with improved performance.