Method of scavenging hydrogen sulfide from sour gas well using mineral oil nanoemulsions

A method of scavenging hydrogen sulfide from a sour gas well, comprising:

• injecting a nanoemulsion through a borehole into a subterranean geological formation comprising a gaseous hydrocarbon composition comprising hydrogen sulfide,
• wherein the nanoemulsion comprises a mineral oil, water, a surfactant, and an additive,
• wherein the water is a continuous phase of the nanoemulsion,
• wherein the surfactant is a sodium dodecylbenzenesulfonate and the additive is a silver salt,
• circulating the nanoemulsion in the borehole in the subterranean geological formation to contact the nanoemulsion with the hydrocarbon composition;
• and
• reacting the nanoemulsion with the hydrogen sulfide in the gaseous hydrocarbon composition to form a production gas comprising less than 5 ppm of hydrogen sulfide,
• wherein a breakthrough time of the hydrogen sulfide is 720 to 760 minutes.

A method of scavenging hydrogen sulfide from a sour gas well, comprising:

• injecting a nanoemulsion through a borehole into a subterranean geological formation comprising a gaseous hydrocarbon composition comprising hydrogen sulfide,
• wherein the nanoemulsion comprises a mineral oil, water, a surfactant, and an additive,
• wherein the water is a continuous phase of the nanoemulsion,
• wherein the surfactant is selected from a group consisting of a sodium dodecylbenzenesulfonate and a nonionic polyoxyethylene detergent,
• wherein the additive is a silver salt,
• circulating the nanoemulsion in the borehole in the subterranean geological formation to contact the nanoemulsion with the hydrocarbon composition;
• and
• reacting the nanoemulsion with the hydrogen sulfide in the gaseous hydrocarbon composition to form a production gas comprising less than 5 ppm of hydrogen sulfide.