Abstract: A cutting and recovery tool for a well-head, having a housing which is adapted to engage with a side wall of the well-head to lock them together, and a mandrel extending through the housing and rotatable relative to the housing and adapted to carry a radially-acting cutter which severs the well-head below the area of engagement of the housing. This allows the well-head to be severed and withdrawn in a single operation.

Abstract: Apparatus and method for a tool that will retrieve either an oil well swab or the down-hole stand which limits the working depth of the swab.

Abstract: A dual string packer is milled by a mill having an annular milling shoe for milling the periphery of the packer and freeing it from the well bore. An axial milling head mills a central hole in the top of the packer before the annular shoe reaches the locking segments. A grapple above the milling head engages the walls of the axial hole to support the remains of the packer in the well. The grapple includes a release ring that can be broken in tension to release the packer mill from a stuck packer if need be. The grapple has a gripper sleeve with longitudinally extending fingers and a camming sleeve for camming the fingers outwardly. An expandable ring inside the camming sleeve provides means for withdrawing the camming sleeve from the gripper sleeve if it should stick.

Abstract: A well pump includes a string of risers composed of a plurality of releasably coupled risers, a hollow upright, and a drive mechanism releasably mounted on the upright. The corresponding erecting rig consists of a mast adapted to be supported by the upright, a deflecting device arranged at the upper end of the mast, and a pulling element passing around the deflecting device and formed at its one end for suspension of a riser and at its other end for suspension of a lifting device. The erecting rig is much lighter in weight and simpler and, therefore, may be transported and assembled more easily than lifting tackle used so far of the same lifting height and capacity.

Abstract: In a tubing conveyed perforating gun assembly, a detonator is discharged by a weight bar dropped into the tubing string, subject to unintended sticking. The disclosed safety anchor includes a rope socket enabling the safety anchor to be lowered into the tubing string. The safety anchor has an elongate body connected below the rope socket by a shear pin. The body has a mandrel and sleeve construction cooperatively connected with a bottom located grapple cage around collet fingers enabling a fishing neck on the weight bar to be grasped and firmly held. A slip radially expands to lock the safety anchor in the tubing string, enabling the weight bar to be held against falling for safe retrieval.

Abstract: An automatic broken-drill-pipe-intercoupling tool having, a body portion with, at one end, a female threaded adapted to cooperate with the threaded male end of the retrievable portion of a broken drill pipe and at the other end a tapered, multi-interwined-spiral bit portion, integral with the body portion, the body portion having flats thereon to permit tightening of the tool on the retrievable portion of the broken drill pipe.

Abstract: There is disclosed a tool for washing over, cutting and retrieving a portion of a pipe or "fish" stuck within a well bore. The tool includes flipper dogs which may move downwardly over a coupling on the pipe, and then raised into gripping engagement with the pipe beneath the coupling, and knives which are forced inwardly into gripping engagement with the pipe in response to an upward strain on the pipe string following engagement of the flipper dogs with the pipe, whereby the pipe may be cut upon rotation of the pipe string.

Abstract: Stuck well pipe is removed from a well bore by applying an upward pull to the stuck pipe while applying an upward jarring action to the pipe by an air hammer which applies rapid blows to a linkage mechanism connected to the pipe.

Abstract: A retrieving mechanism for subsurface releasing and retrieving of a downhole tool. The apparatus includes an overshot defining a central opening therethrough and an annular cavity therein and a mandrel positionable in the overshot central opening. A slotted C-ring with an internally threaded surface is annularly positioned in the cavity in the overshot. The mandrel includes an externally threaded portion. Longitudinal insertion of the mandrel in the overshot results in ratcheting expansion and contraction of the ring for threaded engagement with the mandrel. The threaded surfaces define a thread profile having a first surface, angled with respect to a central axis of the apparatus, which facilitates the longitudinal insertion of the mandrel in the ring, and a second surface, extending normally to the apparatus central axis, which prevents longitudinal disengagement. A seal is located above the ring for sealing engagement with a mandrel sealing surface.

Abstract: A tool for setting or pulling a subsurface tool from a conduit having a pressure charge gas piston and cylinder which are releasably locked together. The piston and cylinder is actuated by setting slips on the tool and unlocking the piston and cylinder. First and second shoulders are actuated by the piston and cylinder to set or pull the well tool. The piston and cylinder includes a movable member initially limiting the communication of the gas with the piston. Drag blocks are connected to the slips for preventing expansion of the slips on downward movement of the tool, and a connection between the tool body and one of the piston and cylinder will set the slips on upward movement of the body and release the piston and cylinder. The tool is particularly useful in setting and pulling a safety valve from a flowline.

Abstract: An apparatus or tool for applying tension to a tubing string. The tool comprises a housing and a sleeve within the housing. One end of the housing is attached to the tubing string and the opposite end of the sleeve is attached to the tubing string. Hydraulic fluid pressure acts upon a piston carried by the sleeve to contract the sleeve relative to the housing and apply tension to the tubing string. The hydraulic tubing tensioner can be used to apply tension to tubing between two packers or to apply tension to a tubing string extending from a downhole packer to the well surface.

Abstract: A surface-controlled subsurface safety valve apparatus and method of utilizing the safety valve in through-the-flowline serviced wells. Both the valve frame and valve operator are provided with ball and socket universal joints to enable passage of the safety valve past restrictions in the flowline resulting from bends and curves in the flowline by flexing the safety valve in moving to and from the subsurface operating location.

Abstract: The method of and apparatus for cutting and recovering submarine surface casing and associated equipment on the ocean floor included the steps of lowering a string into the surface casing which string includes a swivel, a spear and a cutter, seating the swivel on the casing well head seat, actuating the cutter to sever the casing, setting the spear within the casing and recovering the surface casing and well head equipment associated therewith.