Method of and apparatus for squeeze cementing in boreholes

摘要

A well tool system including a device for downhole suspension by means of conduit for engaging and penetrating the casing wall of a wellbore and introducing a fluid into the adjacent penetration. The downhole device includes an expansion piston that extends with sufficient force to seal at least one end of the device against a wellbore casing of relatively large diameter. A projectile is subsequently fired from the device to penetrate the engaged casing and provide a selected path of egress for squeeze cementing or the like therethrough. Thereafter, the device is released from its fixed position in the wellbore by retraction of the piston and retrieved therefrom. The device is disclosed with the expansion piston and method of operation therefor shown and described in several embodiments including explosive and hydraulic actuated mechanisms.