Abstract: A set of dipmeter data comprising monunimodal-symmetric datasets is processed prior to correlation and dip computation and display by transforming the nonunimodal-symmetric datasets into unimodal-symmetric datasets while maintaining the subsets which are already unimodal-symmetric.

Abstract: A set of representative subpopulations of a dataset such as a set of depth related formation log responses is selected by (a) classifying the dataset into n=a disjoint clusters; (b) determining discriminant function for the thus produced n=a disjoint clusters; (c) generating a measure respresentative of agreement/disagreement betweeen the classification generated by cluster analysis in step (a) and the classification generated by discriminant analysis in step (b); (d) repeating steps a-c for other numbers n=a, b, c, . . . ; and (e) selecting the set n=k where k is a, b, c, . . . , where the measure shows best agreement.

Abstract: Sulfur species are removed from a Claus plant tail gas stream by contacting with zinc oxide in the presence of sufficient reducing equivalents for conversion of sulfur compounds to hydrogen sulfide. In another aspect, sulfur compounds are converted to hydrogen sulfide prior to contacting with zinc oxide.

Abstract: Sulfur species are removed from a Claus plant tailgas stream by contacting with ZnO producing ZnS which is regenerated to ZnO by dilute O.sub.2. Following regeneration, freshly regenerated ZnO is purged with an effective reducing gas stream.

Abstract: Oxygen enriched gas to Claus furnace or catalytic reactor is diluted with a process derived dilute H.sub.2 S or SO.sub.2 stream to prevent excessie temperature rise due to use of the oxygen enriched gas.

Abstract: Oxygen feed to a Claus plant is controlled by calibrating a hydrocarbon-representative response signal, but not a hydrogen sulfide representative response signal, responsive to the ratio of hydrogen sulfide:sulfur dioxide in effluent from the Claus plant.

Abstract: Sulfur species are removed from a Claus plant tail gas stream by contacting with zinc oxide in the presence of sufficient reducing equivalents for conversion of sulfur compounds to hydrogen sulfide. In another aspect, sulfur compounds are converted to hydrogen sulfide prior to contacting with zinc oxide.

Abstract: A process for the conversion of hydrogen polysulfide to hydrogen sulfide in liquid sulfur and removal of hydrogen sulfide from said liquid sulfur comprising a multistage process in which the sulfur is supplied to a holding zone, passed to a treatment zone where it is given multiple contact with a solid catalyst adapted to convert hydrogen polysulfide to hydrogen sulfide and removed from a third zone after treatment for hydrogen sulfide removal.Apparatus for carrying out the method is disclosed and described.

Abstract: A method for treating and removing unwanted asphaltene deposits from oil and gas wells, surface equipment, flow lines, and pore spaces of oil-baring formations comprises treatment with an amine-activated aliphatic disulfide oil as an asphaltene solvent. In a preferred aspect, the aliphatic disulfide oil is a dialkyl disulfide oil and is activated by the addition of 10 weight percent of diethylamine. In a specific use, the activated disulfide oil is used to remove asphaltene deposits from an oil-bearing formation and a producing well penetrating the formation.