Method for preventing thaw settlement along offshore artic pipel

Details Method for preventing thaw settlement along offshore artic pipel Method for preventing thaw settlement along offshore artic pipel

1985-11-01

1987-06-30

Husar, Cornelius J.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

With protection or indication of pipe or trench

405131, 405154, E03B 710

Patent

active

046766952

ABSTRACT:
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.

REFERENCES:
patent: 3217791 (1965-11-01), Long
patent: 3282301 (1966-11-01), Ligon
patent: 3766980 (1973-10-01), Kern
patent: 3767149 (1973-10-01), Hill
patent: 4040165 (1977-08-01), Miessler et al.
patent: 4271681 (1981-06-01), Schertz
patent: 4289172 (1981-09-01), Ekstrom
patent: 4300855 (1981-11-01), Watson
patent: 4553879 (1985-11-01), Langner

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