Abstract: An assembly for installation into a wellbore that includes a main wellbore and a lateral wellbore branching off the main wellbore is described. The assembly includes a tubular positionable in the main wellbore, where the tubular includes a profile. The assembly further includes an isolation device securably landable in and sealable against the profile device to isolate a region of the main wellbore from a region of the lateral wellbore.

Abstract: Wellbore apparatus has been invented that includes a whipstock with a top and a bottom, the whipstock disposed in a wellbore extending down from an earth surface into the earth, the wellbore having an inner surface, a mill guide with a body having an upper end, a lower end, and a channel therethrough from the upper end to the lower end, and a portion of the lower end of the mill guide disposed between and held between the inner surface of the wellbore and an outer surface of the top of the whipstock.

Abstract: A tubular well tool receiving conduit for receiving a well tool having anchoring teeth in which a plurality of circular extending grooves on the inside on the conduit are provided for coacting with the anchoring teeth for supporting the well tool. Preferably the grooves match the tooth profile of the anchoring teeth and the grooves are concentric. For receiving a well packer, a second plurality of circularly extending grooves on the inside of the conduit coact with the expandible seal for providing multiple seal points with the packer seal. A no-go shoulder on the conduit positions the well tool in the conduit. In another embodiment, the circular grooves extend longitudinally a greater distance to engage the well tool anchoring means and seal and extend continuously along the inside diameter.