Abstract: A method of stimulating production from an oil or gas well comprising the steps of (a) injecting a desiccant through the well bore to dehydrate the well bore and a production zone within several feet around the well bore, (b) injecting an anhydrous acid into the production strata, the anhydrous acid being formulated to be gaseous at bottom hole temperature and pressure so that the gaseous anhydrous acid permeates through the dehydrated production strata and dissolves in connate water to form an acidic solution, and (c) shutting in the well for a period to allow the acidic solution formed in situ to react with the materials of the formation thereby increasing the permeability of the production strata and stimulating production from the well. A alcohol/polyglycol desiccant with exceptional lubricating, heat stability, and corrosion inhibiting characteristics is used to dehydrate the well and to form a corrosion resistant film on surfaces of the production string and casing.

Abstract: Particular combinations of two or more C.sub.12 -C.sub.22 fatty acid esters of C.sub.2 -C.sub.12 polyhydroxy compounds with C.sub.2 -C.sub.12 alcohol and a masking agent provide lubricants for aqueous well fluids having synergistic lubricity and cake conditioning properties in reducing torque and sticking in wells for natural resource fuel and/or mineral materials.

Abstract: Fluids for drilling, completing or servicing wells are treated for the removal or inactivation of hydrogen sulfide contamination by the addition of at least one organic zinc chelate.

Abstract: The invention of this application is a dispersant system with various embodiments and subcombinations with exceptional dispersions including colloidal suspensions, aqueous hydrocarbon emulsions and emulsions with solid particulate additives dispersed therein. The basic dispersant system which makes the high stability, high weight dispersions or emulsions possible comprises an emulsifier composition containing a fatty acid amide, oleic acid, dimerized oleic acid and a particular type of surfactant dispersant. For certain applications the following optional components can be used: particulate filler or carrier; a hydrocarbon phase which can be either liquid or a colloidal solid; water soluble salts weighting agents; insoluble salts and conventional additives.

Abstract: The invention of this application is a dispersant system with various embodiments and subcombinations with exceptional dispersions including colloidal suspensions, aqueous hydrocarbon emulsions and emulsions with solid particulate additives dispersed therein. The basic dispersant system which makes the high stability, high weight dispersions or emulsions possible comprises an emulsifier composition containing a fatty acid amide, oleic acid, dimerized oleic acid and a particular type of surfactant dispersant. For certain applications the following optional components can be used: particulate filler or carrier; a hydrocarbon phase which can be either liquid or a colloidal solid; water soluble salts weighting agents; insoluble salts and conventional additives.

Abstract: The friction created by rotating and reciprocating a drill pipe in a well penetrating a subterranean formation is reduced by including an ester of an oxazolidine derivative in an aqueous drilling fluid or a mixture of said ester and certain alcohols. This ester of an oxazolidine derivative is represented by the following general formula: ##STR1## wherein n is a whole integer within the range of about 5 to 20.

Abstract: This invention relates to methods and additives for scavenging oxygen dissolved and entrained in liquids which are particularly suitable for removing dissolved and entrained oxygen from polymer-containing fluids used in drilling and completing well bores as well as water flood and other procedures carried out in the oil field. The oxygen scavenger additive is sodium dithionite or a mixture thereof with sodium dithionate dispersed in a liquid carrier such as a hydrocarbon.