Abstract: A primarily electronically set permanent or retrievable downhole tool having a hydraulic contingency arrangement to activate the downhole tool in the conventional way in the event electronic communication fails.

Abstract: A packer is disclosed which uses applied pressure to set the slips and initiate a compressive force on the sealing elements. The compressive force applied to the sealing elements moves components above the sealing elements and allows the available hydrostatic pressure in the wellbore to create an opposing force on the sealing elements to ensure that they properly set. The sealing elements are mounted directly to the packer body, thus eliminating a leakpath from the fluid pressure application port which is located below the sealing elements on the packer body. Various lock rings hold the set of the packer to avoid the creation of boost forces on the sealing elements from applied or induced pressures from above or below the sealing elements. Movement of the body is not required to accomplish setting of this packer. In applications with low hydrostatic pressure, the annulus can be pressurized to assist in obtaining the necessary pack-off pressure.

Abstract: A one-trip assembly that includes the mill or mills for milling a window, the whipstock, the whipstock anchor or packer, and a valving assembly is disclosed which permits running in all the equipment needed for setting and orienting a whipstock and squeezing cement below the whipstock in one trip. Valving is provided which allows for the squeezing to go on after the whipstock packer is set. A feedback technique to determine that the milling assembly been pulled away from the cementing tube is incorporated into the assembly. In one embodiment, upon initiation of milling, pressure differential is used to shift a tube for valve actuation, effectively isolating the squeezed formation from pressures above the whipstock. In another embodiment, the whipstock is shifted to actuate an upper flapper. A second flapper valve is provided, preferably below the whipstock packer, which, responsive to pressure from below, is urged into a closed position.