US 12,221,869 B1
Method for subsurface hydrogen storage using liquid organic hydrogen carriers
Adrian Cesar Cavazos Sepulveda, Nuevo Leon (MX)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Aug. 31, 2023, as Appl. No. 18/459,108.
Int. Cl. E21B 43/16 (2006.01); C01B 3/00 (2006.01); E21B 43/38 (2006.01)
CPC E21B 43/168 (2013.01) [C01B 3/0015 (2013.01); E21B 43/38 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for subsurface hydrogen storage and hydrogen retrieval, the method comprising:
identifying a subsurface formation, wherein the subsurface formation is selected from one or more of a depleted wet reservoir, depleted dry reservoir, salt cavern, excavated cavern, natural formation, isolated aquifer, or a reservoir designated as a contingency or marginal field;
selecting LOHC feed compatible with the subsurface formation; wherein the LOHC feed includes a mixture of one or more completely or partially hydrogenated LOHCs;
injecting the LOHC feed in the subsurface formation for storage;
recovering LOHCs from storage;
separating a recovered water/brine phase and off gas from the LOHCs from storage in a separator configured to produce a stream of recovered LOHCs; and
producing H2 product and dehydrogenated LOHCs in a dehydrogenation unit process.