Abstract: An isolation packer extension doubles the distance between upper and lower packer assemblies of an isolation packer so that less accurate positioning thereof is required when performing cementing operations from a floating vessel.

Abstract: The extended length isolation packer of the present invention comprises upper and lower tubular body assemblies which are interconnected by a middle body. The upper tubular body assembly has an upper packer assembly and a closing positioner attached to its outer surface. The lower tubular body assembly has a lower packer assembly attached to its outer surface. An upper inner mandrel is concentrically disposed within said upper tubular body assembly and has a port disposed therein for communicating an inner cavity of said upper inner mandrel with the annular cavity between the isolation packer and an oil well casing. A lower inner mandrel is concentrically disposed within said lower tubular body assembly and communicates with said upper inner mandrel through said middle body. A fluid bypass is provided through annular cavities between the inner mandrels and the tubular body assemblies.

Abstract: An inflatable packer assembly includes a cylindrical mandrel with a cylindrical valve body concentrically disposed about the mandrel. The valve body includes an inlet communicating with an interior of the mandrel and an outlet for directing fluid to an inflatable element of the packer assembly. First and second axial bores, containing first and second pistons, respectively, are disposed in said valve body and communicate with an end surface thereof. The first bore also communicates with said inlet. A first port connects the first and second bores. A second port connects the second bore and the outlet. The first piston is held in a first position blocking said first port until a pressure differential across the first piston reaches a first level at which the first piston is released and is moved to a second position allowing fluid communication between the inlet and the first port.

Abstract: A port valve isolation packer comprises an upper body, a slip joint port valve, a positioner mandrel, a spacer coupling and a lower body, all of which make up a tubular body of the isolation packer. Said tubular body has upper and lower packer assemblies and a closing positioner attached to its outer surface. An inner mandrel is concentrically disposed within said tubular body. The slip joint port valve includes a slip joint mandrel having a port disposed therein, and a slip joint sleeve having a radial bore therethrough. When said port valve is in a first closed position, said port is blocked by said slip joint sleeve. When said port valve is in a second open position, said port is aligned with the radial bore of the slip joint sleeve. The inner bore of the inner mandrel communicates with said port. A fluid bypass is provided through an annular cavity between the inner mandrel and the tubular body.

Abstract: The inflatable packer element of the present invention includes an inflatable bladder means having a braided wire reinforcing element. An end of the reinforcing element is received between a tapered surface of an annular anchor means and a tapered surface of an annular wedge means. A threaded portion of the anchor means engages a threaded portion of an annular ring. The wedge means is slidably received within the annular ring and engages an abutment of the ring, so that when the threaded connection between the anchor means and the annular ring is made up the reinforcing element is clamped between the tapered surfaces. An additional clamping force is then applied by applying liquid epoxy under pressure against the wedge means to further drive it toward the anchor means and increase the clamping force on the reinforcing element. The pressure is maintained until the epoxy is hardened.