Abstract: A liner hanger and setting tool in which the liner hanger has an expander cone with a rotational clearance space relative to a suporting member and a low friction contacting surface for alleviating binding and frictional forces on the supporting member and where the liner hanger has spaced apart spline housings which cooperate with spline keys on a setting tool to determine rotational torque prior to and during cementing operations and where the release of the setting tool from the liner hanger can be determined prior to cementing.

Abstract: A setting tool for a liner hanger in an oil well completion system wherein the setting tool mechanism incorporates structure for manipulating a liner prior to and subsequent to hanging the liner hanger in a well casing. Prior to setting the liner hanger the setting tool release nut is locked to a liner hanger by a releasable lug interconnection. After hanging the liner hanger, the lug interconnection is released and rotation of the setting tool mandrel uncouples the coupling nut from the liner hanger to release the setting tool from the liner hanger and further rotation of the coupling nut locks the coupling nut to the clutch housing so that the liner can be rotated after it is hung in a well casing.

Abstract: A setting tool for a liner hanger in an oil well completion system wherein the setting tool mechanism incorporates the necessary structure for manipulating a liner prior to and subsequent to hanging the liner hanger in a well casing. Prior to setting the liner hanger the setting tool is keyed to a liner hanger by longitudinal dogs in longitudinal grooves. After hanging the liner hanger, the dogs are released and rotation of the setting tool mandrel uncouples a coupling nut from the liner hanger to release the setting tool from the liner hanger and further rotation locks the setting tool mandrel to the clutch housing with a lock nut so that the liner hanger can be rotated after it is hung in a well casing.

Abstract: A selectively releasable valve in a wiper plug releasably attached to a hydraulic setting tool for a liner hanger in a well bore where the valve has an annular valve seat member having collapsible finger members for sealingly receiving a ball member. The valve seat member is movable under predetermined hydraulic pressure to shift and expand the finger members to release the ball member. The valve seat member is retained in the wiper plug.

Abstract: A rotatable liner hanger for an oil well with a supporting mandrel having an annular recess with upper and lower shoulders and a tubular housing and a bearing means disposed in the recess. The housing has elongated windows with side surfaces having tongue and grooves at an inclination angle of 15.degree. and elongated slip members with interfitting tongue and grooves along their side surfaces where the slip members are initially retracted within the windows of the housing and are extendible outwardly into load bearing support with a casing. A selectively actuated device controls the positioning of the slip members and an annular recess in the housing provides a bypass area when the slip members are extended.

Abstract: In a hydraulically operated setting tool for liner hangers used in a well bore, a norally countracted ball seat formed in the setting tool mandrel by contracted and elongated finger members. Upon seating a ball member in the ball seat, applied pressure is used to set the hydraulic setting tool. After setting the hydraulic setting tool, the ball seat is longitudinally movable so that the finger members can expand to a full opening condition in a recess and release the ball member and so that the finger members are also retrievable with the setting tool.

Abstract: A setting tool and liner hanger where the liner hanger has a threaded release section and elongated slip slots for receiving slips. The slips have inclined upper surfaces and inclined tongue and groove interconnections along the sides of the slots defining expander surfaces. The setting tool has a unitary actuating mechanism which can be hydraulically actuated or can be mechanically actuated. Dog members are on the actuating mechanism are releasably connected to internal grooves in the slip members. For hydraulic actuation, hydraulic pressure moves the connected dog members for setting the slips in a well casing. The mechanical actuator operates in response to relative rotation between the setting tool mandrel and liner hanger for releasing a spring force on dog members to move the slips to a setting condition. The tool is raised to a location to set the slips and to release the setting tool from the liner hanger.

Abstract: In a PBR system in well bores, a retrievable landing assembly which can be set either mechanically or hydraulically has a telescopic setting sleeve and setting collar where the setting collar is interconnected to a setting tool by a first threaded nut member and a second threaded nut member. The setting tool is threadedly attached by one of the threaded nut members to the setting collar and the one threaded nut member is splined for longitudinal movement with respect to a mandrel of the setting tool while the other nut member is longitudinally and releasably splined to the setting collar and threadedly attached to the mandrel of the setting tool. The setting tool has a shiftable sleeve member which can be shifted by a pressure ball and applied pressure to shift the setting sleeve of the landing assembly into a locking position in the setting collar.

Abstract: A liner hanger system for wellbores where the liner hanger includes a polished bore receptacle (PBR) with a releasable latching device. In use, a string of tubing with a sealing assembly adapted for cooperation with the PBR can be releasably latched to the PBR to limit upward travel of the string of tubing relative to the PBR.

Abstract: The present invention relates to a method and apparatus for providing a sliding seal at the upper end of a polished bore receptacle in a wellbore to permit reciprocation of tubing string and to prevent the accumulation of debris in an annulus between a tubing string and a polished bore receptacle. In particular, a slideable and releasable connection is provided on a tubing string to releasably inner-connect with the upper end of a tubular bore in a wellbore and permit a sliding and sealing relationship there between.