Abstract: This invention discloses downhole explosive carriers in which the explosive charges are mounted in a unique staggered spiral pattern thereby allowing a greater number of shots that can be fired per unit length while increasing the spacing between explosive charges; the latter advantage further reduces the potential interference between fired shots and pressure change therefore providing a greater perforated hole size. With a 31/2-inch gun perforating through a 41/2- to 5-inch casing, one trip of the present invention downhole provides as much or greater flow area than what could be achieved by two trips of a conventional gun, while eliminating the risk of splitting the casing which can be caused due to multiple shooting. With a 33/8-inch gun perforating a 5-inch trip of the current invention equals two trips of a conventional gun of the same size, plus a 10% improvement in flow rate.

Abstract: A fluid actuator for a hydraulically powered rotatable gripping device which combines a fluid pressure or force multiplication with the capability of a physical separation of the rotating jaws and the fluid power source to permit rotation of the jaws and any gripped object while maintaining clamping or gripping pressure.

Abstract: A packer joint is provided for mounting on a vessel or pipeline entry valve which includes a stinger guide and an adjustable packer seal. A driving mechanism is mounted on the packer joint to which the stinger is connected for insertion through the packer joint into the vessel or pipe line. Improved clamping collets are mounted within the packer joint to retain the stinger in the desired position after insertion. A safety cap is provided for mounting on or around the packer joint and exposed end of the stinger after the stinger is inserted and the driving mechanism removed.