Patent ID: 11867026
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 18:
19. A method of cooling a drilling fluid circulating in a wellbore drilled by a wellbore drilling system, the method comprising:
filling, with liquid nitrogen, an interior volume of a cryogenic heat exchange system positioned at a surface location separate from a wellhead of the wellbore, the interior volume at least partially defined by an inner surface of an outer jacket of the cryogenic heat exchange system;
flowing, through a drilling fluid conduit of the cryogenic heat exchange system at least partially disposed in the interior volume, a drilling fluid flowed from the wellbore;
cooling, by heat exchange with the liquid nitrogen across a wall of the drilling fluid conduit, the drilling fluid flowing through the drilling fluid conduit;
flowing, via a mud pump, the drilling fluid back into the wellbore.