E - Fixed Constructions – 03 – B
Patent
E - Fixed Constructions
03
B
61/5.2
E03B 7/10 (2006.01) E21B 43/01 (2006.01) F16L 1/12 (2006.01) F16L 1/16 (2006.01)
Patent
CA 1255108
ABSTRACT OF THE DISCLOSURE A method for installing a pipeline for transporting a warm fluid, such as newly-produced oil, across arctic seafloor underlain by a permafrost zone without danger of rupture of the pipeline caused by thawing in the supporting permafrost zone comprises (1) drilling a series of boreholes along the seafloor through a thawed zone of subsea soil so as to penetrate a distance into a zone of permafrost lying thereunder, (2) circulating a warm fluid through each borehole so as to cause a zone of prethawing in the permafrost zone and thereby create a slump trough on the surface of the seafloor along a path marked by the series of boreholes; and (3) installing a warm fluid bearing pipeline along the bottom of the slump trough. Usually a temperature differential between the warm fluid and the bottom of the borehole of at least 2 degrees Fahrenheit is required to assure economical prethawing of the permafrost zone.
521889
Fetherstonhaugh & Co.
Union Oil Company Of California
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