US 11231137 B2 / Jan 25, 2022

Subsea flowline blockage remediation using external heating device

External heating assembly 1 is usable to heat subsea flowline 100 and remediate a blockage in subsea flowline 100 and comprises a predetermined set of heaters 10; one or more conductive layers 20 configured to uniformly distribute heat over an exterior of subsea flowline 100; one or more insulating layers 30 adapted to shield subsea flowline 100, the predetermined set of heaters 10, and conductive layers 20 from ambient seawater temperature; an anchor; and a strength member. The predetermined set of heaters 10 may comprise one or more mineral insulated cables capable of reaching very high temperatures with very little power and minimal controls.