High pressure gas storage

Abstract

A storage wellhead allowing on-line system maintenance and testing is provided. Including at least two fluidically parallel gas passages adapted to allow testing or maintenance of one gas passage, while the other gas passage remains in service. The gas may be hydrogen. Also including at least two fluidically parallel liquid passages adapted to allow testing or maintenance of one liquid passage, while the other liquid passage remains in service. The liquid may be brine.

1 - 21 . (canceled) 
     
     
         22 . A method of on-line system maintenance and testing of a storage wellhead, comprising
 a performing testing or maintenance on a first fluidically parallel and interchangeable hydrogen passage of a hydrogen wellhead spool passages each fluidically parallel and interchangeable hydrogen passage comprising at least one automatic hydrogen valve configured to fail close while a second fluidically parallel and interchangeable hydrogen passage of the hydrogen wellhead spool simultaneously remains in service, or   a performing testing or maintenance on a first fluidically parallel and interchangeable brine passage of a brine wellhead spool each fluidically parallel and interchangeable brine passage comprising at least one automatic brine valve configured to fail close, while a second fluidically parallel and interchangeable brine passage of the brine wellhead spool simultaneously remains in service.   
     
     
         23 . The method of  claim 22 , wherein each hydrogen passage further comprises a hydrogen wing valve. 
     
     
         24 . The method of  claim 22 , wherein each brine passage further comprises a brine wing valve. 
     
     
         25 . The method of  claim 22 , wherein under non-testing conditions all automated hydrogen valves remain open. 
     
     
         26 . The method of  claim 22 , wherein under non-testing conditions all automated brine valves remain open. 
     
     
         27 . The method of  claim 22 , wherein the automated hydrogen valve testing occurs at predefined first intervals. 
     
     
         28 . The method of  claim 27 , wherein the predefined first interval is once a month. 
     
     
         29 . The method of  claim 22 , wherein the automated brine valve testing occurs at predefined second intervals. 
     
     
         30 . The method of  claim 29 , wherein the predefined second interval is once a month. 
     
     
         31 . The method of  claim 22 , wherein all automated hydrogen valves and all automated brine valves are tested at a predefined third interval. 
     
     
         32 . The method of  claim 31 , wherein the third interval is every six months. 
     
     
         33 . The method of  claim 32 , wherein the test comprises measuring the time for each valve to move from a fully open position to a fully closed position. 
     
     
         34 . The method of  claim 22  wherein the automated valves are hydraulically operated. 
     
     
         35 . The method of  claim 22 , wherein the hydrogen wellhead spool operates at a pressure of greater than 2400 psig. 
     
     
         36 . The method of  claim 35 , wherein the hydrogen wellhead spool operates at a pressure of less than 4000 psig. 
     
     
         37 . The method of  claim 36 , wherein the hydrogen wellhead spool operates at a pressure of less than 3000 psig. 
     
     
         38 . The method of  claim 22 , wherein the brine wellhead spool operates at a pressure of greater than 2400 psig. 
     
     
         39 . The method of  claim 38 , wherein the brine wellhead spool operates at a pressure of less than 4000 psig. 
     
     
         40 . The method of  claim 39 , wherein the brine wellhead spool operates at a pressure of less than 3000 psig.