Abstract: The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amounts of sulfonated styrene-maleic anhydride copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylamide or their derivatives.

Abstract: Novel compositions are prepared by reacting hydrocarbyl substituted nitrogen-containing aromatic heterocyclic compounds such as 2,5-dimethylpyridine or 2,4,6-collidine, an aldehyde such as formaldehyde, or a ketone such as acetone, or mixtures thereof and an amine having a combined total of at least seven carbon, nitrogen, oxygen or sulfur atoms and at least one reactive amine hydrogen atom such as 1-dodecanamine in the presence of a suitable catalyst such as hydrogen chloride. These novel compositions, as well as their free amine forms are useful as oil and gas well corrosion inhibitors.

Abstract: A micellar acidic surfactant solvent composition of enhanced oil/organic solvency and method of preparing and using same. The oil solvency of a propoxylated/ethoxylated surfactant and alcohol micellar acidizing system is enhanced by controlling or selecting the molar ratio of alcohol to surfactant as a linearly increasing function of acid concentration. The oil solvency is further enhanced and selectively controlled by addition of an oil solvent (e.g., aromatic hydrocarbons, aromatic acid esters, ketones, CS.sub.2, etc.) to the micelle.

Abstract: Aqueous drilling muds which are rheologically stable, non-toxic and adopted for use at high temperatures, are comprised of a viscosity modifying material, e.g., a conventional clay, and a copolymeric dispersant therefor, said copolymeric dispersant comprising the water-soluble, low molecular weight copolymerizate of from about 75 to 99 molar % of acrylic or methacrylic acid, or admixture thereof, with from about 1 to 25 molar % of a water-soluble salt of allyl or methallylsulfonic acid, or admixture thereof.

Abstract: Organophilic polyphenolic materials which are effective fluid loss control additives for oil base well-working fluids are prepared from a polyphenolic material and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most preferably commercial lecithin. Preferred polyphenolic materials comprise one or more of: humic acid; lignosulfonic acid; lignins; phenolic condensates; tannins; the oxidized, sulfonated, or sulfomethylated derivatives of these polyphenolic materials; and the water soluble or colloidally dispersible salts of these polyphenolic materials or these derivatives thereof.

Abstract: Foamed treating fluids contain an acid component, a gas, optionally an organic solvent and emulsifying agent, and, as a foaming agent, a mixture of a quaternary ammonium halide cationic surface active agent and either an alkylamido alkylamine oxide surface active agent or a betaine amphoteric surface active agent. Such treating fluids can be used to dissolve acid-soluble components from various surfaces, such as a subterranean reservoir penetrated by a well, the well itself, or an industrial vessel or conduit containing a scale.

Abstract: A process for the transportation of viscous crude oils utilizes an emulsifier-containing oil-in-water emulsion having at least 10-15% water which is subsequently separated again into crude oil and water. The emulsifier is a carboxymethylated ethoxylate of the formulaR--(O--CH.sub.2 --CH.sub.2).sub.n --O--CH.sub.2 --COOMwhereinR is a linear or branched aliphatic residue of 6-20 carbon atoms, or an alkyl- or dialkylaromatic residue of 5-16 carbon atoms per alkyl group,n is 1-40 andM is an alkali or alkaline earth metal ion, or ammonium.

Abstract: The present invention relates to a filtration control additive for use in invert emulsion drilling fluids; the method of preparing such additives; the invert emulsion drilling fluid produced therefrom; and a method of drilling, completing, and working over a subterranean well, utilizing such drilling fluid containing the filtration control additive which is utilized in a water-in-oil, emulsion-type subterranean drilling fluid. The additive comprises the pyrolyzed product obtained by intermixing and heating a finely divided humic acid-containing material and a primary amine having an alkyl radical of 10 to 20 carbon atoms or a primary amine having one alkyl-substituted phenyl radical, the alkyl radical having 10 to 20 carbon atoms. The amine may also be a secondary amine having at least one alkyl radical of 8 to 20 carbon atoms.

Abstract: A micellar slug for use in the recovery of oil, consisting essentially of a surfactant and an aqueous medium, which may contain an inorganic salt. The surfactant contains, as essential constituents,(a) at least one internal olefin sulfonate having 10 to 26 carbon atoms; and(b) 0.1 to 60 parts by weight, based on 100 parts by weight of the internal olefin sulfonate, of at least one ether sulfonate having the general formula:R.sup.1 --O--(R.sup.2 O).sub.m --(R.sup.3 O).sub.n --R.sup.4 --SO.sub.3 X (I)wherein R.sup.1 represents an alkyl or alkenyl phenyl group having 12 to 26 carbon atoms or an alkyl or alkenyl group having 10 to 24 carbon atoms, R.sup.2 represents C.sub.2 H.sub.4 or C.sub.3 H.sub.6, R.sup.3 represents C.sub.2 H.sub.4 or C.sub.3 H.sub.6, R.sup.4 represents C.sub.2 H.sub.4, C.sub.3 H.sub.6, or CH.sub.2 CH(OH)CH.sub.2, n.gtoreq.0, m.gtoreq.0, and n+m=0 to 15, and X represents an alkali metal or an alkaline earth metal.

Abstract: A post-primary oil recovery process wherein the subterranean oil-bearing formation is treated by the sequential injection of (1) optional aqueous preflush to adjust connate water salinity, (2) aqueous saline surfactant system containing at least one acylated polypeptide salt surfactant, (3) optional thickened aqueous mobility buffer and (4) an aqueous drive, for the recovery of oil driven from the formation thereby.

Abstract: A corrosion inhibiting composition including a solution of at least one alkali or alkaline-earth metal halide in water and specific corrosion inhibiting concentrations of zinc ions and thiocyanate ions, for use in well drilling, completion, packer fluid and workover operations.

Abstract: A solvent for sulfur consisting of a dialkyl disulfide which is free of any basic substance. It is obtained from a commercial dialkyl disulfide by treatment with a reagent capable of eliminating or blocking the basic substances, particularly amines, which are customarily present in such a product. This reagent may be an acid.The use of the product, after treatment in this manner, for dissolving sulfur which has deposited in the casings of natural gas wells permits the reuse several times of the dialkyl disulfide employed.

Abstract: The present invention relates to a filtration control additive for use in invert emulsion drilling fluids; the method of preparing such additive; the invert emulsion drilling fluid produced therefrom; and a method of drilling, completing, and working over a subterranean well, utilizing such drilling fluid containing the filtration control additive which is utilized in a water-in-oil, emulsion-type subterranean drilling fluid. The additive comprises the pyrolyzed product obtained by intermixing and heating a finely divided humic acid-containing material and a primary amine having an alkyl radical of 10 to 20 carbon atoms or a primary amine having one alkyl-substituted phenyl radical, the alkyl radical having 10 to 20 carbon atoms. The amine may also be a secondary amine having at least one alkyl radical of 8 to 20 carbon atoms.

Abstract: The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amount of sulfonated styrene-itaconic acid copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylamide or their derivatives.

Abstract: The instant invention is directed to a polymer, having an intrinsic viscosity of 1.0 to 7.0, preferably 1.5 to 5.0, dl/g in 1.0 M NaCl, prepared from:(A) 2.5 to 45%, by weight, of at least one unsaturated carboxylic acid, or its salt;(B) 5.0 to 85%, by weight, of at least one unsaturated sulfonic acid, or its salt;(C) 2.5 to 15%, by weight, of at least one unsaturated cationic-containing monomer; and(D) 0 to 90%, by weight, of at least one unsaturated non-ionic monomer.The instant invention is also directed to the polymer in combination with an aqueous clay dispersion and the use of the admixture as a filtration aid in drilling muds.

Abstract: A corrosion inhibitor for mild steel comprising the combination of trimethylolethane or trimethylolpropane with a disclosed alkanolamine.

Abstract: A wellbore service fluid is provided which contains water, a water soluble electrolyte and as a thickening agent at least one of an amine, a salt of an amine, or quaternary ammonium salt which functions to increase the viscosity of the fluid in the presence of said electrolyte.

Abstract: An arrangement for the infeed and withdrawal of caseless ammunition from automatic firearms, consisting essentially of a belt feed mechanism and a cartridge belt conveyed thereby, which includes cartridge pockets at regular intervals interconnected with each other. The pockets formed of two arms which are bent about the cartridges transversely of the longitudinal axis of the belt. The opposite free ends of the arcuately-shaped metal arms which are arranged at a spacing from each other include means which are in operative association with spreader elements of the feed mechanism for the spreading apart of the arcuately-shaped metal arms so as to allow for cartridge withdrawal. Through intermediary of the means which are arranged on the arms, and which are in operative association with the respective spreader elements of the star wheel or feed mechanism, there is additionally possible a simple withdrawal of the cartridges within the weapon and completely without any damaging of the ammunition.

Abstract: New compositions of matter are disclosed which are the products resulting from reacting an alkyl substituted aromatic heterocyclic nitrogen-containing compound such as 2,4,6-trimethylpyridine or 2,3,5,6-tetramethylpyrazine with a dicarboxylic acid monoanhydride such as 2-dodecen-1-yl succinic anhydride. These compositions are useful in preventing corrosion of metallic articles in corrosive environments. They are particularly useful in down hole oil and gas well applications.

Abstract: An improved method for inhibiting the deposition of paraffins on the surface of equipment in contact with crude oil or natural gas streams containing paraffins. The deposition of paraffins may be reduced by first contacting the equipment with a sulfur trioxide containing fluid and then adding an aqueous solution containing hydroxyl ions to the crude oil or natural gas streams containing paraffins which are in contact with the equipment.