Patent ID: 8726998

Claim:
A BOP heating method comprising: operating a coiled tubing unit using a hydraulic fluid in a hydraulically manipulated component, the hydraulic fluid increasing in temperature with use and exceeding an ambient temperature; supplying the hydraulic fluid from the coiled tubing unit through a supply tube to an exchange tube and returning the hydraulic fluid from the exchange tube through a return tube to the coiled tubing unit; transmitting heat from the hydraulic fluid through a wall of the exchange tube and through a heat spreading material to an inner plate, the heat spreading material being between the exchange tube and the inner plate and the exchange tube being arranged in a serpentine form between the inner plate and an opposing outer plate; transmitting heat from the inner plate to a BOP on which the outer plate, the exchange tube, the heat spreading material, and the inner plate are temporarily mounted, a control opening through the outer plate, the inner plate, and the heat spreading material exposing a control port of the BOP; and increasing a temperature of the BOP to above ambient temperature using the heat from the hydraulic fluid.