WDK hydraulic expansion type packer (casing external packer) uses hydraulic expansion
type structure, mainly be used in the complex wells'(oil、gas、water) completion project, to
achieve downhole packer and bridging and in favor of improvement of the quality of
completion . The practice proved that this tool have characters of easy operation 、wide
adaptability, it has a very important position in the completion project.
Hydraulic expansion packer mainly consists of valve system joint assembly、rubber barrel、central tube、casing sub.
The valve system is divided into axial valve system and radial valve system.
Radial valve system is composed of a set of three valve