Steel pipe hydraulic expansion type external casing packer

The invention relates to a steel pipe hydraulic expansion type external casing packer, comprising a base pipe, an upper fixing member, a lower fixing member and sealing rubber, wherein two ends of the base pipe are respectively provided with a connector. A liquid inlet hole is machined in the base pipe; a pressure-limiting rupture disk is arranged in the liquid inlet hole; a sliding sleeve is connected in the base pipe in the position of the liquid inlet hole through a primary pin bolt; the sliding sleeve is provided with a through hole which is communicated with the liquid inlet hole; an expansion pipe is arranged at the outer side of the base pipe; the upper end of the expansion pipe is fixedly connected with a sliding nipple; the sliding nipple is fixedly connected with an upper connecting member through a secondary pin bolt; the sliding nipple is hermetically inserted in the upper fixing member through the upper connecting member; the upper fixing member is fixedly connected with the base pipe; the lower end of the expansion pipe is fixed at the outer side of the base pipe through a lower connecting member and the lower fixing member; more than one section of sealing rubber is arranged at the outer side of the expansion pipe; the base pipe is further internally provided with a pressing tool. As a hydraulic expansion steel pipe and the sealing rubber are employed, the steel pipe hydraulic expansion type external casing packer has the advantages of large packing outer diameter, high strength and capability of packing a well hole adaptably, and can be widely applied to well completion fields, such as sectional well completion and interlayer packing.