Well perforating and completion apparatus and associated method

Abstract

A well perforating and completion apparatus includes a packer connectable to the lower end of a tubing string, a vent assembly connected below the packer for communication between the tubing string and the annulus, a well perforating gun assembly having a hydraulically actuatable detonator and a hydraulic actuating fluid flow path between the detonator and the earth surface. A releasable coupling is provided between the packer and the vent assembly to permit disconnecting and dropping of the vent assembly and perforating gun assembly from the tubing string after the perforation has been accomplished to leave an open ended tubing string in the well. The well perforation and completion method of this invention includes assemblying the tool string on the tubing string then running it into the well and positioned with the perforating gun and the packer at the desired location. The packer is set then the perforating gun fired by manipulating the hydraulic fluid pressure in the well through the hydraulic fluid flow path. Well production can then begin immediately through the vent assembly. Provided the perforating gun assembly is to be detached further manipulation of hydraulic pressure in the well or in an alternative mechanical manipulation of the coupling is used.