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

Claim 0:
1. A system for cooling drilling fluid circulating in a wellbore drilled by wellbore drilling system, the system comprising:
a drilling fluid conduit positioned at a surface location separate from a wellhead of the wellbore, through which passes drilling fluid flowed from the wellbore; and
an outer jacket, an inner surface of which at least partially defines an interior volume within which the drilling fluid conduit is at least partially disposed, wherein the interior volume is at least partially filled with liquid nitrogen, such that the drilling fluid passing through the drilling fluid conduit is cooled by heat exchange with the liquid nitrogen across a wall of the drilling fluid conduit prior to flowing back into the wellbore via a mud pump.