The utility model provides a heating power packer is flexible compound pipe water injection string in pit, the flexibility is compound including in the pit manages, and the flexible compound lower extreme of managing is connected with down the crossover sub in the pit, and lower crossover sub lower extreme has first steel oil pipe through threaded connection, and first steel oil pipe lower extreme has the heating power packer through threaded connection, and heating power packer lower extreme threaded connection has second steel oil pipe, and second steel oil pipe lower extreme threaded connection has prefabricated seating nipple, and the upper end of flexible complex pipe is connected with the crossover sub in the pit, rotates upward the overhead end of changing -over and is connected with the lifting sub. This casing adapter is few, can save the installation jobs time, improves completion practice efficiency, the flexible compound pipe in the pit of this tubular column has stronger non -corrosibility ability, can effectively slow down oil pipe and corrode, extension tubular column life, the heating power packer of this tubular column is effectual separates perforation section and upper portion sleeve pipe, can add cover protection of pipe liquid at the oil jacket annular space simultaneously, slows down the sleeve pipe and corrodes, extension sleeve pipe life.