Abstract: A packer utilizing a C-slip in which, during release of the packer, the upper expander pulls the C-slip off of the lower expander. If a packer is stuck in the well, the upper expander is keyed to the slip to prevent rotation of the upper expander during milling.

Abstract: An apparatus for measuring bottom hole conditions such as pressure in the tubing of a well including a locking and sealing sub to lock into and seal against the interior of the tubing, an isolation valve connected in the sub and a measuring instrument connected to the valve for measuring conditions in the tubing. The isolation valve has a bore with an annular seat in the bore and side ports leading into the bore below the seat. A valve element is longitudinally movable in the valve between an open position below the ports and a closed position against the seat and includes an elongate mandrel having a backup shoulder. A latch mechanism initially holds the valve in the open position and includes a collet member initially engaging the mandrel and holding the valve element in the open position and the collet is held in a latched position by a spring loaded backup shoulder.

Abstract: There is disclosed, for use in a system for landing wire line "no go" tools at selected levels within a tubing string, a landing nipple connectible in the tubing string and in which either a top or a bottom "no go" tool may be landed.

Abstract: A side wall clamp is disclosed for use in conjunction with downhole tools, the clamp having a fail-safe mechanism which permits unclamping of the tool from the bore hole wall even if the clamp actuator means is inoperative, by exerting upward pull on the wire line or drill string to which the tool is attached.

Abstract: The present invention relates to an apparatus for controlling the rate and extent of cutting slots in flow conductors, particularly casing in wells. The apparatus is hung in the well from a pipe string, locked in position, and force applied to the string. A hydraulic metering mechanism acts against the applied force to control the rate of travel of one or more jet bodies attached to the movable mandrel of the apparatus, the stroke of which determines the extent of the cut.

Abstract: The invention discloses apparatus for supporting a submersible pump motor unit in a stilling tube. The unit is suspended from a rising main. The stabilizing means comprises a plurality of sets of self-acting locking devices each having a cam fast on a shaft pivotally mounted in a bracket which shaft also carries counterweights which bias the cams radially outwardly.Bearing plates are located on the stilling tube and the cams engage respective plates to lock the pump against lateral movement. Each set of devices consists of four devices disposed in a lateral plane equidistantly about the axis of the tube. The plurality of sets are spaced in the longitudinal direction of the pipe.

Abstract: A unitary tubular cylindrical gripping member for well tools has variable angled gripping surfaces formed thereon by a plurality of insert teeth elements arranged to provide constant positive gripability of the gripping member in well casings.

Abstract: In the representative embodiment of the new and improved apparatus disclosed herein, a so-called "stuck-point indicator" or "freepoint-indicator" tool includes a deformation-responsive sensor tandemly supported between upper and lower selectively-operated tool anchors of a unique arrangement which, in the preferred embodiment of the tool, are cooperatively arranged to be sequentially engaged with longitudinally-spaced wall portions of a string of well pipe believed to be stuck in a well bore. In the disclosed embodiment of the tool, each tool anchor respectively includes a set of pivoted anchor members and actuating links adapted to swing the anchor members outwardly into anchoring engagement with the pipe wall for securing the tool against longitudinal movement in the pipe string.

Abstract: A method and apparatus for telemetering information from the bottom of a borehole to the surface while drilling wherein a wireline is used to transmit the information from the bottom of the borehole to an intermediate position in the drill string, and a special drilling string, having an insulated electrical conductor, is used to transmit the information from the intermediate position to the surface. In an alternate arrangement, an electro-magnetic method may be used to transmit information from the intermediate position to the surface. There is also disclosed special equipment that permits removal of the jumper wire from the surface without removing the drill string from the borehold.

Abstract: A wireline latching apparatus and method of use with wireline instruments for measuring temperature and pressure downhole in flowing oil and gas wells. The latching apparatus includes a tubular body for connection to the instrument. Three arms are mounted in the tubular body pivotally so that their upper ends open outward. A downwardly facing shoulder is located in the well pipe in the area where the measurements are to be taken. An actuating mechanism is operable to open and close the arms so that their upper ends bear against the shoulder. The instrument with the latching mechanism is lowered into the well and positioned so that the arms are adjacent the shoulder. The arms are opened to engage the shoulder and the wireline tensioned to prevent whipping of the line as fluid flows past.

Abstract: A well casing hanger for suspending a string of tubing from an outer casing landing nipple, with the hanger structure automatically engaging the nipple structure and latched to a locked state withstanding either suspended weight or upward pull in tension. Hanger structure release is provided by rotation of a member operating a threaded coupling on the upper end of the hanger-operating mandrel through providing a recess to accommodate internal lugs of locking keys so they can be cammed inwardly and unlocked with lifting upward movement of the hanger structure from the landing nipple.

Abstract: An unitary tubular locking member is rotatably mounted on a mandrel along with sleeve means for pivoting the locking member into abutting engagement inside a landing nipple in a tubing string.