Check insulation pipe butt weld quality, there should be no visible defects. (2) brushing anticorrosive primer on the exposed part of the nozzle. (3) will special connector respectively from the junction exclusive leads and heating pipe to connect the power cord, leads, docking, with brass compression after the plastic, then use special connector sealing connection and tighten. (4) the use of hydrophobic silicate insulation material, wrapped around the exposed part of the package, careful operation, shall not damage the insulation pipe waterproof cap and special connectors. The thickness of the insulation layer is to ensure that the outer diameter of the protective layer of the insulation pipe is suitable. (5) the heat shrinkable tape is wound on the mending, heated shrinkage, hoop insulation layer, to ensure all repair wounds are completed. (6) finished water should be careful visual inspection of the mending of each, and achieve the requirements are as follows: fill the mouth at the appearance of smooth, beautiful and no burr, damage, cracks and leakage filling, waterproof close, no obvious depression to ensure mending the heat preservation layer thickness to the insulation pipe insulation layer thickness. (7) heating pipe according to the construction standard and the wellhead process meet, the power line cable distribution box and connected, and installation of the temperature sensor, the system again the insulation detection, can be qualified after the operation.