Subsea pipeline remediation heating

A heating system for a subsea pipeline including a lower portion embedded in a seafloor and an upper portion above the seafloor, the heating system comprising:

• an insulating layer including a middle portion covering the upper portion of the subsea pipeline, the insulating layer further including an end portion covering the seafloor, the insulating layer forming a cavity adjacent to the seafloor, the subsea pipeline, and the insulating layer;
• and
• a plurality of heater cables within the cavity, the plurality of heater cables configured to heat a fluid within the subsea pipeline, the plurality of heater cables separated from the subsea pipeline only by seawater or by soil of the seafloor within the cavity,
• wherein the insulating layer comprises a plurality of baffled chambers configured to be inflated and deflated.

A heating system for a subsea pipeline including a lower portion embedded in a seafloor and an upper portion above the seafloor, the heating system comprising:

• an insulating layer including a middle portion covering the upper portion of the subsea pipeline, the insulating layer further including an end portion covering the seafloor, the insulating layer forming a cavity adjacent to the seafloor, the subsea pipeline, and the insulating layer;
• a plurality of heater cables within the cavity, the plurality of heater cables configured to heat a fluid within the subsea pipeline, the plurality of heater cables separated from the subsea pipeline only by seawater or by soil of the seafloor within the cavity;
• and
• a top securing element configured to secure the insulating layer to the subsea pipeline, the top securing element placed through the insulating layer and into the subsea pipeline.

A method comprising:

• surrounding a portion of a subsea pipeline with an insulating layer, the insulating layer including a space adjacent to the subsea pipeline;
• placing a first heater cable in the space;
• inflating a plurality of baffled chambers within the insulating layer;
• heating the first heater cable to a first predetermined temperature based on a melting point of hydrate formations or wax formations within the subsea pipeline;
• and
• limiting the first heater cable to a second predetermined temperature based on a temperature limit of a coating or insulation of the subsea pipeline.

A method comprising:

• surrounding a portion of a subsea pipeline with an insulating layer, the insulating layer including a space adjacent to the subsea pipeline;
• placing a first heater cable in the space;
• surrounding the insulating layer with a rubber cover and securing the insulating layer to the subsea pipeline by attaching a cable weight to the rubber cover;
• heating the first heater cable to a first predetermined temperature based on a melting point of hydrate formations or wax formations within the subsea pipeline;
• and
• limiting the first heater cable to a second predetermined temperature based on a temperature limit of a coating or insulation of the subsea pipeline.