Abstract: A downhole fishing jar mechanism for freeing stuck objects within a well bore which incorporates a housing structure defining an internal anvil element through which an upwardly-directly impact force is adapted to be transmitted to the body structure. A striker element, incorporated with an elongated operator element is adapted to strike the anvil with an impact force that is controlled by means of an adjustable compression spring. A spherical detente-type latching mechanism is adapted to establish a releasable interconnection with the operator element and further is operative to transmit the compression of the spring to the operator element. The latch mechanism releases automatically upon predetermined upward movement of the operator element and latch mechanism within the body structure, thereby allowing the operator element to move upwardly and cause the striker to impart a predetermined impact force to the anvil.

Abstract: An instrument hanger for use in tubing is disclosed with an anti-kick, anti-fall running tool. In one embodiment, the tool includes an internal mandrel, an external sleeve, with the mandrel being tapered wherein the external sleeve supports upwardly pointed detents and downwardly pointed detents against the taper which detents prevent untimely fall of the tool and untimley upward movement thereof.The tool combination includes a packer element including a set of expandable slips or collet fingers functioning in conjunction with the packer to expand and plug the tubing string. Further tool combination may support an instrument package such as a downhole pressure measuring mechanism used to obtain downhole pressure readings after isolating above a particular zone.

Abstract: A pulling tool for retrieving an article or fish from a well bore and utilizing a spear or grapping type action to establish connection with the fish. Cooperative internal and external tubular members are selectively movable to secure the pulling tool to the fish or to release the fish. An internal spring element cooperating with a positioning pin establishes controlled relative movement of the internal and external tubular members upon simple linear movement of the tool.

Abstract: An overshot adapted to engage and disengage a fishing neck in a well bore. The apparatus comprises an overshot body, a set of collet fingers which deflect radially and have a surface to grasp a fish in a well bore, a tapered surface abutting the collet fingers which deflect inwardly and outwardly to engage and disengage the fish, and a cam and cam follower mechanism. The cam preferably includes a set of inwardly projecting pins which engage grooves formed on a cam body. The grooves cause the cam body to move upwardly and downwardly with respect to the overshot body. The cam body reciprocates, moving the fingers relative to the tapered surface, thereby providing the engagement and disengagement movement. The cam body causes repetitive movement lengthwise of the cam body relative to the pins which serve as a cam. The groove enables movement toward one end of the body and then toward the other. A spring forces the cam body in one direction while it is forced in the other direction by contact with the fish.

Abstract: A releasable spear adapted to be run on a wireline or a tubing string, as desired, incorporates an elongate body and an external slidable sleeve. The sleeve is forced downwardly by a compressed spring at the top end of the sleeve. The sleeve supports a pair of internal projecting lugs which are received in an external groove formed in a tubular member. The lugs and groove function as a cam and cam follower mechanism controlling upward and downward movement. The body terminates in an elongate tapered plug. The lower end of the sleeve incorporates a set of collet fingers which have external upwardly facing serrations to lock on the interior of a fish. The external sleeve incorporates a protruding shoulder which catches the upper end of the fish. The cam and cam follower mechanism controls axial movement of the elongate tapered plug to force the collet fingers outwardly to engage, or cause them to deflect inwardly to disengage a fish.

Abstract: A wire line oil tool adapted for multiple connectors on the bottom. It can be used as an overshot, a fishing neck grapple or an inside grapple. It incorporates an outer body which is annular about a central member. A catch mechanism locks the outer body up or down relative to the inner body. The catch mechanism enables the tool to operate on jarring. On jarring, the two parts move relatively to an up or down position. In the down position, the appendages at the bottom of the tool open to engage a fishing neck or the like. In the up position, it is latched or held. If retrieval of the tool is impeded, subsequent jarring will reverse the catch mechanism and release the fishing neck. The device is particularly adapted to be used on wire line retrieval and running operations. In the event an item is grasped which cannot be retrieved, subsequent jarring will achieve release and retrieval of the tool.

Abstract: An improved overshot for grappling a fishing neck is disclosed. A fishing neck has an undercut shoulder with a protruding enlarging thereabove. This disclosure is directed to an overshot having an upper body and a fixed inner tubular sleeve. The tubular sleeve has elongate supports which extend to a bottom ring. The bottom ring has an internal taper. The internal taper works against the right and left halves of a scissor mechanism. The tips of the scissors are constructed with undercuts to reach below and grab the nether shoulder of a fishing neck. The scissors are normally forced closed by the inner taper of the ring. When a fishing neck is engaged, the scissors are forced upwardly, moving as a unit with the scissors mounted on a pin which pin is supported by an outer sleeve which maintains alignment of the moving apparatus relative to the inner sleeve. The pin extends through slots formed in the inner sleeve.

Abstract: For use in oil tools which are adapted to be run travelling relatively upwardly or downwardly in drill pipe for removing mud in the drill pipe, an improvement which incorporates a swab cup which flares out to contact the side wall of the pipe for the purpose of wiping it clean. It incorporates a rubber tubular body which is clamped in a slidable position on a support mandrel. The cylindrical body is tubular and concentric with the mandrel. The swab cup flares outwardly and has an exposed, external wiping lip. The external lip is shaped and dimensioned to contact the surrounding wall. This enables it to wipe the wall clean. The lip is connected to some elongate support members, typically straps which have a sizeable width which collectively extend from the lip to an encircling sliding collar. The collar slides along the support mandrel. The range of travel of the collar is limited by a shoulder preferably incorporated in the support mandrel.