Abstract: An offshore platform rig cleaner consisting essentially of as major components d-limonene (5-7% actives by weight), a non-ionic surfactant selected from one member of the group consisting of ethoxylated octyl and nonyl phenol (15-21% actives), and an acrylic copolymer thickener (0.2 to 0.4%). The thickener may be preferably ethyl acrylate-methyacrylic acid. It has also been found that in the preparation of the cleaner the order of addition should be water then surfactant then d-limonene to avoid haze in the composition and to facilitate manufacture.

Abstract: A squeeze treatment for preventing scale utilizes as the scale inhibitor a predominantly phosphinate containing composition comprising:______________________________________ Mole Percent - Ingredients Less Than ______________________________________ A. Monosodium phosphinicobis - 22 (succinic acid) B. Monosodium phosphinico- 26 succinic acid C. Sodium phosphonosuccinic acid 12 D. Sodium phosphate 5 E. Sodium phosphite 6 F. Sodium hypophosphite, and 6 G. A phosphinicosuccinic acid oligomer having the probable structural formula: ##STR1## ______________________________________wherein G exceeds 25 mole percent, M is H, Na, K, NH.sub.4, amine salts and mixtures thereof and m and n are either 0 or a small whole number with the proviso that either m or n is a small whole number and the sum of m plus n is greater than 2.

Abstract: Sulfonated phenolic compounds as well as sulfomethylated phenolic compounds, surfactant system containing such compound and the use of such surfactant systems in post primary oil recovery are disclosed.

Abstract: In accordance with the present invention, oil is recovered from a subsurface earth formation by injecting into the subsurface formation an aqueous surfactant system containing a polyvalent metal carboxylate, as a surfactant, a cosurfactant and an electrolyte in concentrations and proportions to form multiphase system with the reservoir oil, thereafter, injecting into the earth formation a drive fluid to drive the multiphase system through the reservoir and displace a significant amount of the reservoir oil and withdrawing the thus displaced oil from the subsurface earth formation. A novel aqueous surfactant system, adapted to thus recover oil from a subsurface formation, comprises a polyvalent metal carboxylate, such as calcium isosteareate, as a surfactant, and an alcohol having at least five carbon atoms, as a cosurfactant, and an electrolyte, such as sodium chloride, in proportions which form a multiphase system with the reservoir oil.

Abstract: Sulfonated phenolic compounds as well as sulfomethylated phenolic compounds, surfactant systems containing such compound and the use of such surfactant systems in post primary oil recovery are disclosed.