Water-based drilling fluid formulated using MnZnFe-layered triple hydroxide and a process for scavenging hydrogen sulfide from subterranean geological formations

A method of removing hydrogen sulfide from a subterranean geological formation, comprising:

• injecting a drilling fluid suspension in the subterranean geological formation,
• wherein the drilling fluid suspension comprises a layered triple hydroxide material comprising manganese, zinc, and iron,
• wherein the drilling fluid suspension has a pH of 10 or more,
• wherein the layered triple hydroxide material is present in an amount of 0.01 to 0.5 percent by weight of the drilling fluid suspension,
• circulating the drilling fluid suspension in the subterranean geological formation and forming a water-based mud;
• and
• scavenging the hydrogen sulfide from the subterranean geological formation by reacting the hydrogen sulfide with the layered triple hydroxide material in the water-based mud.