Abstract: Generating heat within a combination solvent/acid system removes undesirable deposits from petroleum reservoir formations (especially the near well-bore region), oilfield equipment, and petroleum processing equipment. An exothermic reaction occurs between the solvent and the acid and the heat evolved helps remove organic solid deposits. The acids may include organic acid compounds, such as sulfonic acids, sulfuric acid and nitric acid. The solvents may include terpene- and terpene-derivative-containing solvents, including, but not necessarily limited to, limonene, pinene, dipentene, myrcene, turpentines and compounds having at least one double bond, such as methyl furan, dienes, styrene, vinyl acetate and the like. The exothermic reaction produces a great amount of heat, and together with using certain acids and solvents already known as effective to remove paraffin and asphaltene deposition, removing such deposits is improved.

Abstract: Generating heat within a combination solvent/acid system removes undesirable deposits from petroleum reservoir formations (especially the near well-bore region), oilfield equipment, and petroleum processing equipment. An exothermic reaction occurs between the solvent and the acid and the heat evolved helps remove organic solid deposits. The acids may include organic acid compounds, such as sulfonic acids, sulfuric acid and nitric acid. The solvents may include terpene- and terpene-derivative-containing solvents, including, but not necessarily limited to, limonene, pinene, dipentene, myrcene, turpentines and compounds having at least one double bond, such as methyl furan, dienes, styrene, vinyl acetate and the like. The exothermic reaction produces a great amount of heat, and together with using certain acids and solvents already known as effective to remove paraffin and asphaltene deposition, removing such deposits is improved.

Abstract: An improved method of transporting viscous hydrocarbons containing at least 10 to 15 percent water from a well bore hole or between two points via pipeline which comprises adding to the viscous hydrocarbon containing water a sufficient amount of a nonaqueous solution or dispersion of a surfactant to form a low viscosity oil-in-water emulsion which is easily transported.

Abstract: This invention relates to particulate compositions containing chemical additives for petroleum systems. The particulate compositions when added to petroleum systems gradually dissolve over a period of time, releasing the chemical additive, so as to improve the petroleum system. The use of such particulate compositions has an advantage over the use of the chemical additive itself since the pellets give longer residence time and sustained treatment over a longer period.

Abstract: This invention relates to the removal of organic deposits containing asphaltenic compounds from surfaces with hydrocarbon-substituted arylsulfonic acids such as alkaryl sulfonic acids; a composition comprising a mixture of:(1) an aromatic hydrocarbon, and(2) a hydrocarbon-substituted-alkarylsulfonic acid such as an alkaryl sulfonic acid, for example an alkylbenzenesulfonic acid where the alkyl group has at least 5 carbon atoms, for example, from about 5 to 20 carbon atoms can be used for the removal of organic deposits containing asphaltenic compounds from surfaces.