| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 294860100 | Well type | 16 |
| 20090206620 | Spearhead assembly - A spearhead assembly ( | 08-20-2009 |
| 20120074722 | Head Assembly - A head assembly includes a spear head assembly and a latching system which are coupled together. The spearhead assembly includes a spear point having a proximal end pivotally coupled about a pivot axis and a sleeve that is biased in a direction toward a pointed end of the spear point. The sleeve is coupled with the spear point so that the spear point and the pivot axis can move axially relative to the sleeve. The latching system includes a latch body and two latch dogs which are coupled to the latch body and movable between a latching position where the latch dogs extend from the latch body and can engage a latching mechanism, and a release position where the latch dogs retract inwardly. The latching system is configured to enable the latch dogs to move parallel to each other rather than pivot when moving between the latch and release positions. The spear head assembly enables the head assembly to be coupled to an overshot to enable tripping through a drill string. The latching system enables the head assembly to selectively engage the latching mechanism inside the drill string to hold the head assembly in at least one axial direction relative to the drill string. | 03-29-2012 |
| 294860130 | With separate lateral positioning means | 1 |
| 20140138969 | Fishing Guide for Directing a Skewed Fish in a Wellbore - A guide has an open end and a finger structure preferably of a shape memory alloy. The guide is run in small-diameter configuration through a restriction with a fishing tool, such as an overshot, above it. Once through the restriction, power to heaters on the fingers takes the material past its transition temperature to allow the guide lower end to fan out and surround a skewed fish that is in a slanted position and leaning on a wall of a surrounding tubular that has a larger dimension than the restriction. The bottomhole assembly is then advanced until the fish is captured by the fishing tool and pulled out of the hole. The fingers are forcibly retracted as the assembly is pulled back through the restriction. The guide can use retained fingers with an outward bias to flare out after passing through a restriction, thus acting as a fish guide. | 05-22-2014 |
| 294860140 | With separate grapple-setting operator | 1 |
| 294860150 | Fluid pressure operator | 1 |
| 20090146441 | GRIPPING TOOL WITH FLUID GRIP ACTIVATION - A gripping tool has at least one body, including an associated load adaptor adapted to be connected to and interact with one of a drive head or reaction frame. A gripping assembly, carried by the body, has a grip surface adapted to move from a retracted position to an engaged position to radially engage one of an interior surface or an exterior surface of a work piece upon relative axial displacement of the body relative to the grip surface in at least one axial direction. A fluid activated grip activation assembly acts between the at least one body and the grip surface. Axial movement of the load adaptor displaces fluid into a fluid chamber between the at least one body and the grip surface to create relative axial displacement of the at least one body relative to the grip surface. | 06-11-2009 |
| 294860170 | With releasing means | 3 |
| 20080252088 | Sucker rod fishing tool - A fishing tool for fishing sucker rods from a subterranean well. A body of the tool is a machined top piece, a machined barrel piece and normally a machined bottom piece that all thread together. The bottom piece preferably retains a curved cast metal slip movable within grooves milled internally into the body. The slip moves upward to admit a rod into the tool and moves downward to capturing the rod in the tool. A lower end of a side opening provided in the barrel piece is level with an upper shoulder of the slip when the slip is at its lowest position so that the rod engages and is retained by both in the tool. The upper shoulder of the slip can optionally be provided with teeth. The bottom piece can be replaced with a bell and the top piece 16 can be replaced by a prior art fishing tool. | 10-16-2008 |
| 20090146442 | Sucker rod fishing tool - A fishing tool for fishing sucker rods from a subterranean well. The tool is a top piece, a barrel piece and bottom piece that all thread together. One or more extender sections are added by unthreading the top piece from the barrel piece and threading the extender sections therebetween to effectively lengthen the barrel piece and increase its functionality. The bottom piece retains a curved cast metal slip movable within grooves milled internally into the body. A lower end of a side opening provided in the barrel piece is level with an upper shoulder of the slip when the slip is at its lowest position. Optionally, the bottom piece can be replaced with a bell, lip guide, mill shoe, or other types of tools and the top piece can be replaced by a prior art fishing tool or other tools. | 06-11-2009 |
| 294860180 | Excessive force-responsive | 1 |
| 20110163560 | DOWNHOLE TOOL RELEASING MECHANISM - A downhole tool releasing mechanism which includes a collet for releasably engaging a mandrel of a downhole tool. A retaining band is circumferentially disposed about the fingers of the collet for maintaining engagement of the collet and the mandrel prior to application of a predetermined axially directed force on the releasing mechanism. Upon application of such a force the collet fingers expand, breaking the shear band, the mandrel is released and the downhole tool is disengaged. | 07-07-2011 |
| 294860240 | Expanding grapple means | 5 |
| 20100181789 | Milled Packer Retaining Tool with Reverse Circulation - A grapple device is secured to a mill to allow relative rotation between them. The grapple has an outward bias to allow it to grip the packer bore or an extension from the packer. The mandrel has a wedge adjacent its lower end and torque fingers that fit between grapple segments when relative longitudinal movement occurs between the mandrel and the grapple assembly. The grapple assembly has a left hand thread so that it comes out of the packer if the mandrel engages the grapple assembly in a manner for tandem rotation. The torque fingers on the wedge on the mandrel support the grapple fingers over their length as rotation to the right removes the grapple assembly from the packer bore. Reverse circulation takes away the cuttings into the mill bore where they are separated from the reverse circulating fluid. | 07-22-2010 |
| 20130113227 | HIGH EXPANSION OR DUAL LINK GRIPPER - A gripper mechanism for a downhole tool is disclosed that includes a linkage mechanism. In operation, an axial force generated by a power section of the gripper expands the linkage mechanism, which applies a radial force to the interior surface of a wellbore or passage. For certain expansion diameters, the expansion force can be primarily transmitted from a roller-ramp interface expanding the linkage. For other expansion diameters, the expansion force can be primarily provided by expansion of the linkage, in which during a first stage the expansion force is primarily provided by a first link and during a second stage the expansion force is primarily provided by a second link. Thus, the gripper can provide a desired expansion force over a large range of expansion diameters. | 05-09-2013 |
| 20150021946 | Apparatus for Releasably Holding a Pipe, Rod or the Like - For holding a pipe, rod or the like, such as a section of a pipe string of an offshore oil drilling rig, an apparatus includes a clamping device insertable into a support body. The clamping device includes a device body with a central opening bounded by an inner circumferential surface that conically tapers at a cone angle. The device further includes clamp elements that are received in the central opening of the device body and that each have a radially outer surface sloping along the cone angle to slide along the inner circumferential surface of the device body, and a radially inner clamping surface to clamp against the coaxially arranged pipe. A holding element respectively connects each clamp element to a linear actuator stroke element that is similarly tilted at the cone angle. The linear actuator may be received in a receiver shaft of the device body. | 01-22-2015 |
| 294860250 | Cammed grappling means | 2 |
| 20090273201 | TRICAM AXIAL EXTENSION TO PROVIDE GRIPPING TOOL WITH IMPROVED OPERATIONAL RANGE AND CAPACITY - An improvement in a gripping tool having a grip surface carried by movable grip elements and cam linkages to radially move the grip surface from a retracted to an extended position. The improvement involves a tri-cam linkage with cam pairs supporting bi-rotary to axial stroke activation and further cam linkages to cause radial stroke of the tool grip surface as a function of axial stroke. | 11-05-2009 |
| 20130161965 | CIRCUMFERENTIAL CAMS FOR MECHANICAL CASE RUNNING TOOL - A casing running tool is provided having both axial and circumferentially tapered elements. In certain embodiments, the casing running tool comprises cam structures that are circumferentially tapered so as to allow an applied torque to engage and disengage the casing running tool with a casing or liner. In embodiments, the circumferential taper of the cam structures allows a mandrel or rollers disposed between the mandrel and cam structures to apply radial force to corresponding shoe structures which in turn engage or disengage the casing or liner. The cam structures may also exhibit an axial taper to allow for a self-energized fail-sage operation of the casing running tool. | 06-27-2013 |
| 294860260 | Contracting grappling means (e.g., overshot) | 4 |
| 20090121507 | Apparatus for gripping a down hole tubular for use in a drilling machine - An apparatus for gripping a down hole tubular includes a body element defining a central cavity along a longitudinal axis. Disposed within the body element is at least one engaging member. In one aspect, the engaging member has an upper gripping element and a lower gripping element. The gripping elements are designed to be movable with respect to one another. A rod is pivotally attached to the engaging member. The rod moves the engaging member radially inward or outward with respect to the longitudinal axis of the central cavity. In one embodiment, a slewing device is coupled to one end of the body element. The slewing device is moveable with respect to the body element along the longitudinal axis. The rod includes a first end and a second end. The first end is slidably and rotatably connected to the stewing device, such that the first end is radially moveable relative to the longitudinal axis as the stewing device is moved along the longitudinal axis from a first position to a second position. An engaging member is pivotally connected to the second end of the rod. | 05-14-2009 |
| 294860270 | Inwardly biased grappling means with trip | 1 |
| 20130214546 | FAIL SAFE LOCKING OVERSHOT DEVICE - A fail safe locking overshot device. The overshot device is connected to a hoisting line for retrieval of a spearhead. The device provides automatic engagement of a mechanical locking system through locking dogs for locking the lifting dogs after capture of a spearhead. Manual disengagement is required to unlock the lifting dogs and release the spearhead. | 08-22-2013 |
| 294860300 | Cammed grappling means | 1 |
| 294860310 | Inwardly biased grappling means | 1 |
| 20120086227 | 3-RING NON-EXTRUSION SEAL ASSEMBLY AND METHOD - A three-ring seal assembly is provided to seal across extrusion gaps of varying size when used during down hole fishing operations. | 04-12-2012 |
| 294860320 | Resilient grappling means | 1 |
| 20140070558 | Stretchable Elastomeric Tubular Gripping Device - A selectably operable passive gripping device for gripping tubular materials has an elastomeric element which is provided with integrally bonded segmented end rings to prevent the extrusion of the elastomer when it is subjected to high compressive loads. The elastomeric element is molded so that its as-molded gripping surface interferes with the surface of tubular objects to be gripped. The elastomeric gripping element is mounted and supported by a structural element or housing and allows axial flow communication through the gripped tubular objects. The gripping device is used to lift tubular objects such as a tubular string used in oil field applications. | 03-13-2014 |
