Compact, retrievable packer

摘要

A compact, retrievable packer has a unitary mandrel body which is intersected by one or more longitudinal bores. The effective running length of the packer is reduced by an improved arrangement of packer components which serve multiple functions. The hydraulic actuator includes a cylinder housing which also serves as an internal slip housing, a lower element retainer, a piston extension, and a part of the release apparatus. A release sleeve serves as a part of the release apparatus, as a mandrel for engaging a locking slip, and forms a fixed boundary of the hydraulic pressure chamber. The effective running length of the packer is further reduced by making the upper wedge for reacting the setting forces as an integral part of the packer mandrel body.