Manganese oxide sulfide capture drilling fluid
View Patent ↗A method of drilling a subterranean geological formation is described. The method includes driving a drill bit to form a wellbore in the subterranean geological formation thereby producing a formation fluid including hydrogen sulfide. The method further includes injecting a drilling fluid into the subterranean geological formation through the wellbore. The drilling fluid includes an aqueous solvent, a hydrogen sulfide scavenger including particles of a manganese oxide supported on a porous support. The particles are suspended in the aqueous solvent. The method further includes reacting the hydrogen sulfide scavenger with the hydrogen sulfide present in the formation fluid to form a manganese sulfide.
1. A drilling fluid, consisting of:
water; and
a hydrogen sulfide scavenger consisting of particles of a manganese oxide supported on a porous aluminum oxide support,
wherein particles of the hydrogen sulfide scavenger are suspended in the water,
wherein the drilling fluid is capable of scavenging hydrogen sulfide for 110-500 minutes following contacting with 100 ppm of the hydrogen sulfide in methane at a gas flow rate of 100 mL/min,
wherein the hydrogen sulfide scavenger is present in an amount of 2.5-10 mg per mL of the water, and
wherein the particles of the manganese oxide have a mean particle size of 5 to 10 nm.
2. The drilling fluid of claim 1 , wherein the hydrogen sulfide scavenger has a molar ratio of manganese to aluminum of 1:1 to 1:5.
3. The drilling fluid of claim 1 , wherein:
the hydrogen sulfide scavenger has a mean particle size of 100 to 10,000 nm.
4. The drilling fluid of claim 1 , wherein the aluminum oxide is gamma (γ) aluminum oxide.
5. The drilling fluid of claim 1 , wherein the particles of the manganese oxide are on an exterior surface of the porous aluminum oxide support.
6. The drilling fluid of claim 1 , wherein the particles of the manganese oxide are within pores of the porous aluminum oxide support.