US 12,270,266 B1
Method of removing hydrogen sulfide from a subterranean geological formation with an imidazolate-based nanomaterial in an oil-based drilling fluid
Sagheer A. Onaizi, Dhahran (SA); and Mustapha Iddrisu, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Apr. 26, 2024, as Appl. No. 18/648,003.
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 21/00 (2006.01); B01D 53/52 (2006.01); B01D 53/78 (2006.01); B01J 20/18 (2006.01); B01J 20/28 (2006.01); C09K 8/34 (2006.01); C09K 8/54 (2006.01)
CPC E21B 21/00 (2013.01) [B01D 53/52 (2013.01); B01D 53/78 (2013.01); B01J 20/186 (2013.01); B01J 20/28007 (2013.01); B01J 20/28066 (2013.01); B01J 20/28071 (2013.01); B01J 20/28073 (2013.01); B01J 20/2808 (2013.01); B01J 20/28083 (2013.01); C09K 8/34 (2013.01); C09K 8/54 (2013.01); B01D 2253/108 (2013.01); B01D 2253/304 (2013.01); B01D 2253/306 (2013.01); B01D 2253/308 (2013.01); B01D 2253/311 (2013.01); B01D 2257/304 (2013.01); C09K 2208/10 (2013.01); C09K 2208/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of removing hydrogen sulfide from a subterranean geological formation, comprising:
mixing a cobalt-imidazolate material with an organic liquid to form a drilling fluid suspension,
wherein the cobalt-imidazolate material is present in an amount of 0.1 to 2.5 percent by weight of the drilling fluid suspension,
wherein the cobalt-imidazolate material is a ZIF-67,
wherein the organic liquid comprises one or more unsaturated oils,
wherein the drilling fluid suspension has a pH of 10 or more,
injecting the drilling fluid suspension in the subterranean geological formation,
circulating the drilling fluid suspension in the subterranean geological formation and forming an oil-based mud; and
scavenging hydrogen sulfide from the subterranean geological formation,
wherein the hydrogen sulfide reacts with the cobalt-imidazolate material during the scavenging.