Patent ID: 9052289
Filing Date: 2015-06-09
Classification: C09K,G01N,Y10T

Abstract:
1. A reagent mixture for spectroscopic detection of hydrogen sulfide within formation fluid, the reagent mixture comprising: a solvent; metal ions dissolved in the solvent for reacting with hydrogen sulfide thereby forming an insoluble metal sulfide species, the metal ions selected from the group consisting of bismuth and cadmium; and a capping agent that limits growth of the insoluble metal sulfide species by steric stabilization under downhole conditions to prevent precipitation and to provide for spectroscopic detection of the insoluble metal sulfide species stabilized within the mixture, wherein the capping agent is comprised of a soluble polymer from the group consisting of one of a poly(acrylamide-co-acrylic acid), a poly(acrylic acid), a chitosan, a poly(vinyl pyridine), a poly(ethylene glycol) monolaurate, a poly(ethylene oxide), a poly(vinyl alcohol), a poly(4-styrene sulfonic acid), a poly (methacrylic acid), and a poly (vinyl pyrrolidone).