Abstract: A running tool is disclosed to deliver tools downhole, preferably supported on a wireline. The running tool will not release the downhole tool before the desired depth is reached, even if an obstruction is encountered. The tool has the ability to release upon application of pressure in the wellbore. The tool features a floating piston with a pre-charged chamber on one side. Hydrostatic pressure acts on the opposite side of the floating piston as the running tool descends. When the downhole tool reaches its desired depth and becomes supported, slacking on the wireline traps the hydrostatic on one side of the floating piston. Applied wellbore pressure, acting on a release piston exposed to the trapped hydrostatic on its opposite side, shifts the release piston and releases the running tool from the downhole tool. On the way uphole, the trapped hydrostatic pressure is released.

Abstract: A release mechanism for use with setting wellbore isolation tools, such as packers or bridge plugs. The release mechanism typically includes a release piston which selectively isolates equalization ports extending from the interior to the exterior of a setting tool body. The release piston may be activated to allow equalization of pressure across the sealing elements of a set isolation tool, typically by applying pressure to the annular space above the isolation tool. The release mechanism may be used to allow a tool body (such as a setting or retrieving tool) to be removed from a set isolation tool under conditions in which high pressure differential exists across the isolation tool.

Abstract: A downhole pulling tool (100) for retrieving downhole devices (102, 104) from a wellbore is disclosed. The downhole pulling tool (100) includes a mandrel (106) and a sleeve (108) that is slidably disposed about the mandrel (106). The sleeve (108) is moveable in a first direction from a first position to a second position relative to the mandrel (106) and is moveable in a second direction from the second position to a third position relative to the mandrel (106). An engagement member (114) radially extends between the mandrel (106) and the sleeve (108) and is operated from a retracted position to an engagement position when the sleeve (108) is moved to the second position relative to the mandrel (106) after equalization.

Abstract: A running/setting tool for packers is disclosed which can release in several different ways. The tool can be pumped through for normal release. The tool may be hydraulically released by dropping and pumping a ball to a seat and subsequent pressurizing. A frangible member is provided so that if circulation is impeded, it can be established by breaking the frangible member to allow a ball to be pumped to a seat. Finally, a shear release technique is provided which allows release by breaking a shear pin or shear ring or other frangible member, which unsupports collets to allow for removal. A support shoulder is provided on the tool to prevent the collets from becoming stressed on the trip out of the hole if the tool encounters a collar or other internal obstruction.

Abstract: Disclosed herein is a method and apparatus for setting a compression seal pack in a well without rotation of the pipe string and setting mandrel. The setting device includes a release device and a moveable member. The release device secures a setting mandrel in a non-engaged position with respect to the seal packer. The moveable member is positionable to a first position, where the setting mandrel is locked in its non-engaged position, and to a second position, where the release device is free and the setting mandrel may move with respect to the seal packer. The method disclosed herein includes coupling the setting device to a compression set packer, positioning a setting mandrel within the seal packer and setting device, positioning the seal packer at the desired location in a well, releasing the setting mandrel from its non-engaged position with respect to the seal packer and lowering the setting mandrel into engagement with said packer to set the packer in the well.

Abstract: The liner assembly and method includes lowering a liner, liner hanger, liner hanger setting tool, liner packer, and liner packer setting tool into the borehole on a work string. The liner hanger is set either hydraulically or mechanically using the liner hanger setting tool at the option of the operator. The liner is then cemented within the borehole and the liner packer setting tool is used to set the liner packer either hydraulically or mechanically at the option of the operator. The liner packer setting tool includes an actuator assembly mounted on the exterior of a tubular body. The actuator assembly includes an actuator member having a contact member which engages the packing element on the liner packer such that upon movement of the contact member with respect to the liner packer, the packing element on the liner packer is compressed to sealingly engage the cased borehole. The actuator member is sealed from the fluid pressure within the borehole until the liner packer is to be set.

Abstract: A method of completing a subterranean well and associated apparatus therefor provide efficient operation and convenience in completions where production of fluids from a lateral wellbore and a parent wellbore is desired. In one disclosed embodiment, the invention provides a method whereby a tubular member may be extended from a parent wellbore into a lateral wellbore, without the need of deflecting the tubular member off of a whipstock or other inclined surface. The tubular member may be previously deformed and initially constrained within a housing, so that as the tubular member extends outwardly from the housing, the tubular member is permitted to deflect laterally toward the lateral wellbore.

Abstract: A plug is provided which is specially adapted for statically setting a plug portion within an internal profile formed in a wellhead. In an illustrated preferred embodiment, the plug portion is set by application of fluid pressure to a running tool portion. When set in. the profile, the plug portion is secured statically relative to the profile, thereby permitting advantageous utilization of a metal-to-metal seal on the plug portion. The plug portion includes features which maintain its set configuration in the profile. The running tool portion includes multiple pistons which enhance operation of the running tool portion. A disclosed verification tool provides an indication that the plug portion has been properly set.

Abstract: A method of completing a subterranean well and associated apparatus therefor provide efficient operation and convenience in completions where production of fluids from a lateral wellbore and a parent wellbore is desired. In one disclosed embodiment, the invention provides an efficient method of protecting a junction of multiple wellbore portions by positioning a tubular drilling guide within the well extending through the junction. In one aspect of the present invention, the drilling guide is sealingly engaged with certain ones of the wellbore portions while drilling operations are being performed.

Abstract: A float valve 10 includes a valve body 12 for sealing engagement with a float sub 20 having threads for threaded engagement with an oilfield tubular. A valve element 40 includes a stem 50, 70 and a valve cone 52, 80 secured thereto. The valve cone is configured for sealing engagement with a seat 58 on the valve body. An elastomeric seal 48 may also be provided for sealing engagement with the valve body. The stem 50, 70 and the cone 52, 80 are preferably interconnected by a shrink-fit operation, wherein the cone is heated so that a cylindrical recess within the cone expands, while at least a front end 52, 72 of the stem 50, 70 is cooled so that its diameter is reduced. The shrink-fit operation forms a surprisingly reliable interconnection of a float valve stem with a cone, and substantially increases the life of the downhole float valve.

Abstract: 058457102 A method of completing a subterranean well and associated apparatus therefor provide efficient operation and convenience in completions where production of fluids from a lateral wellbore and a parent wellbore is desired. In one disclosed embodiment, the invention provides an efficient method of protecting a junction of multiple wellbore portions by positioning a tubular drilling guide within the well extending through the junction. In one aspect of the present invention, the drilling guide is sealingly engaged with certain ones of the wellbore portions while drilling operations are being performed.

Abstract: A float valve 10 includes a valve body 12 for sealing engagement with a float sub 20 having threads for threaded engagement with an oil field tubular. A valve element 40 includes a stem 50, 70 and a valve cone 52, 80 secured thereto. The valve cone is configured for sealing engagement with a seat 58 on the valve body. An elastomeric seal 48 may also be provided for sealing engagement with the valve body. The stem 50, 70 and the cone 52,80 are preferably interconnected by a shrink-fit operation, wherein the cone is heated so that a cylindrical recess within the cone expands, while at least a front end 52, 72 of the stem 50, 70 is cooled so that its diameter is reduced. The shrink-fit operation forms a surprisingly reliable interconnection of a float valve stem with a cone, and substantially increases the life of the downhole float valve.

Abstract: This invention relates to a release/anti-preset mechanism for retrieving a down-hole tool and for preventing premature actuation of the tool during insertion thereof into a subterranean well-bore. Release mechanisms for retrieving down-hole tools are known and can be divided into three main types: shear release systems, conventional wireline/coil tubing/drill pipe (WL, CT, DP) actuated systems and hydraulically activated systems. Known mechanisms suffer from a number of problems. Accordingly the present invention provides a retrievable down-hole tool (5) having a release/anti-preset mechanism comprising first and second members (10, 15) radially releasably engagable by a third member (20) which controls radial deflection of one of the first or second members (10, 15).

Abstract: There is a need for a device for driving plastic casing into a water well, or for removing such casing from the well without damaging the casing. This need is met by a casing drive apparatus which includes a shoe for attachment to the bottom end of a plastic well casing, an annular groove defining a pair of shoulders in the sleeve, a drive sub for insertion into the sleeve, a plurality of dogs pivotally mounted in the drive sub for engaging the shoulders, and helical springs for biasing the dogs outwardly into engagement with the shoulders, whereby, when the sub is slid into the sleeve and the dogs engage the shoulders, vertical force exerted on the sub results in movement of the dogs against the shoulders to effect vertical movement of the sleeve and consequently of the well casing.

Abstract: An inflatable packer and a method for its use are provided for introduction into a subterranean well bore on a conduit. A pinch can form in the inflatable elastomeric bladder of the packer during inflation, forming a seal on the central body, which obstructs the effective passage of pressured fluid, thereby obstructing effective inflation and deflation of the bladder. The packer provides a tension means such that, after an initial amount of inflation, a predetermined amount of inflation pressure must be introduced to the bladder before an end of the bladder is released for axial movement relative to the central body, allowing a gap to form between the bladder and the body and a predisposition to radially expand before full inflation, to diminish the bladder's propensity to pinch and seal on the body.

Abstract: A scoophead/diverter system is run into a wellbore using a novel scoophead running tool. The running tool allows circulation through its inside diameter, and has internal pressure integrity to test any seals below the running tool prior to releasing the scoophead. This also allows circulation while running in order to apply MWD techniques. This run-in tool includes a mounting head from which extends a running stump and a housing (or connecting mandrel) parallel to the running stump. The running stump and housing are sized and configured to be respectively received in large and small diameter bores in the scoophead. The scoophead running tool thus allows torque to be transmitted about the centerline of the scoophead assembly in spite of being attached into one of the offset bore. This torque transmission is accomplished by connecting the connecting mandrel between the running tool and scoophead at the same offset as the large bore of the scoophead.

Abstract: Insert type floating equipment valves for use in the cementing of casing in oil and gas wells and the like which may be retained in the casing therein through the use of slips or set screws or anchors and uses either cup type or compression type sealing members.

Abstract: A method and apparatus for controlling the intrusion of steam (e.g. breakthrough) from a zone of a producing formation into a slotted liner of a gravel-packed, production well of a steam flood recovery operation. An assembly including a blank, scab conduit is lowered into the upper portion of the slotted liner to effectively block those openings in the slotted liner which lie adjacent the steam intrusion zone. A seal, (e.g. deformable metal seal, metal seal rings, etc.) is provided at the upper end of the blank conduit to block upward flow between the liner and blank conduit when the blank conduit is in place. In a further embodiment, a second set of seals can be provided to block the downward flow of steam between the blank conduit and the slotted liner.

Abstract: An apparatus and method of anchoring a work string to a packer set in a wellbore and releasing therefrom. The apparatus includes a stinger, a collet slidably disposed on the stinger and having a plurality of collet fingers adapted for engaging the packer, a shear ring member shearably attached to the stringer and adapted for holding the collet fingers into engagement with the packer. The packer may be normally released by applying torque to the work string such that the collet fingers are unthreaded from the packer. Torque is applied from the stinger to the collet fingers by a load ring attached to the stinger and having splines extending between the collet fingers so that torque may be applied to the collet without applying torque to the shear ring member.

Abstract: A hydraulic release tool used above any work string which includes an elongated mandril and a releasing means axially and slidingly mounted within the mandril and having an internal stabilizing means and/or external/internal fishing/neck capable of releasing a male conversion means and/or external/internal fishing neck. The male conversion means and/or external/internal fishing neck is disposed at the lower end of the hydraulic release tool, and is released when the work string tools become stuck, thus allowing the stuck work string tools to become relieved by any conventional standardized overshot fishing tool; while also allowing the retrieval of the tubing above the released hydraulic release tool.

Abstract: A well servicing assembly utilizes a plug mechanism for preventing fluid loss into a formation. The assembly includes a string of tubing which carries a packer, a perforating gun, a running tool, and a latch assembly. After perforating, the operator pulls the tubing upward, leaving the packer in place. The latch assembly engages the packer. The latch assembly has a plug contained therein which prevents downward flow of fluid through the packer as the tubing string is retrieved to the surface. After removing the perforating gun, the tubing string may be again lowered and re-engaged with the latch assembly. The latch assembly may be then repositioned below the packer.

Abstract: Whipstock/packer assembly equipment and procedures to retrieve and reuse a whipstock assembly during drilling operations for horizontal drainhole application. The anchor is seated in a retrievable packer and has a bore communication with the fluid path in the whipstock and ports through the anchor body to the bore. Fluid pumped through the ports after a drilling operation flush cuttings from the annulus between the anchor and the associated packer and carry them to the surface, thereby preventing the cuttings from hampering removal of the anchor. The same fluid path can be used to introduce a gel to the annulus prior to drilling to prevent cuttings from collecting on the packer. Introduction of fluid after the drilling operation may be employed to remove the gel and collected cuttings or the whipstock/packer assembly may be withdrawn without flushing.

Abstract: A hydraulic release tool used above any work string which includes an elongated mandril and a releasing means axially and slidingly mounted within the mandril and having an internal stabilizing means capable of releasing a male conversion means. The male conversion means is disposed at the lower end of the hydraulic release tool, and is released when the work string tools become stuck, thus allowing the stuck work string tools to become relieved by any conventional standardized overshot fishing tool; while also allowing the retrieval of the tubing above the released hydraulic release tool.

Abstract: An apparatus and method of anchoring into a packer with a stinger assembly is disclosed. Further, an apparatus and method of releasing from a packer is also disclosed. The apparatus includes an elongated stinger member, a plurality of collet finger members slidably attached to the stinger, a shear ring member with a chamfered shoulder containing a plurality of splined extensions, with a plurality of shear pins contained through the shear ring member. Further, the apparatus includes a load ring attached to the elongated stinger for transferring the load of the downhole tool from the collet finger members to the load ring.

Abstract: A body (B) having a collapsed resilient element (55) therein is releasably secured on a mandrel (M). A packer (P) is supported on a packer support (26) on the mandrel. As the packer tool is assembled, opposed lugs on the mandrrel are placed in a J slot (54) of a member (25) so the packer is capable of being set by a wireline pressure setting assembly (W) when the packer tool is positioned in the opening in a tubular member or in open hole in a well bore without requiring further manipulation of the packer tool. A J slot on the member (25) cooperates with the lugs on the mandrel (M) in setting the packer tool, in releasing the packer tool and in enabling the packer tool to be readily converted for setting by a well string if desired as well as enabling the packer tool to function in many applications such as, but not limited to use as a bridge plug, production packer, test packer, treating packer, multiple string packer, seal bore packer and compression or tension well string anchor.

Abstract: Apparatus for sealing a perforated liner to a well casing. A cylindrical liner having a sleeve thereabout is associated with a deforming tool which is telescoped thereon and extends to the sleeve. A portion of the sleeve is spaced from the cylindrical liner to receive the deforming tool. A pressure fluidizing solid is located within the sleeve. An impacting system for a hydraulic deforming mechanism are employed to force the deforming tool against the pressure fluidizing solid which in turn deforms the sleeve outwardly against a well casing.

Abstract: A single wiper is releasably and sealably positioned adjacent the lower end an operating string and locked therewith to prevent premature release from the operating string upon manipulation of the operating string. The sealing relationship between the wiper and the operating string prevents communication of operating string pressure from the operating string to the resilient ribs of the wiper adjacent the position of the wiper on the operating string. When a pump down plug is sealably seated within the bore of the wiper, fluid pressure is confined to act on a piston between the operating string and the wiper to unlock the wiper from the operating string so that it may be released therefrom.

Abstract: A method and apparatus for sealing a well annulus, the apparatus comprising a resilient sealing element molded in a upwardly oriented frustro-conical form affixed to a packer body. A running tool is mated with the packer body, the running tool having an internal bore adapted to collapse the sealing element to the diameter of the internal bore. The packer body is mated with a tubing screen by right hand threads and the running tool, packer body and tubing screen lowered into a well casing at the end of a pipe string. The well seal is activated when the pipe string is rotated in a clock-wise direction, disengaging and withdrawing the running tool and releasing the skirt which expands to seal with the internal walls of the casing.

Abstract: A system and a plug for plugging a well conduit. The plug includes a lock mandrel and a valve. There is a prong releasably connected in the plug. A running tool is adapted to releasably connect to the plug lock mandrel and prong. After the plug is lowered into a well conduit and installed in a landing nipple, upward releasing force on the running tool moves the prong upwardly closing the valve and plug to flow and the prong locks in valve closed position. Later, the prong may be disconnected and raised from the plug to surface, permitting pressure outside and inside the plug to equalize for retrival of the plug.

Abstract: An arrangement for lowering into a well bore casing on an operating string to sealably engage a packer that is supported on a tubular member so that the packer can be set either by a combination of hydraulic or mechanical action or mechanical action alone or hydraulic action alone includes a packer supported by a tubular member. An outer tubular member extends from adjacent the other end of the packer and telescopically receives the tubular member and a release mechanism releasably connects the tubular member and the outer tubular member with the operating string. A lock arrangement locks the tubular member and the outer tubular member together against relative longitudinal movement and the lock arrangement is operable after the release mechanism is actuated to disconnect the tubular member from the operating string whereupon said outer tubular member may be moved relative to the tubular member to expand the packer into sealing engagement with the casing.

Abstract: A well sealing apparatus, and method of use, which seals between tubular goods and a well casing without the use of a sealing tool run separately. The apparatus has a resilient skirt which is sealed against the well casing by split rings which are released from containment by the assembly as the assembly is released from the drill pipe.

Abstract: A plugging apparatus for a gravel packer. The apparatus includes a plug comprising an operating mandrel slidably received in an outer mandrel. A collet is positioned on the outer mandrel. Actuation of the operating mandrel allows engagement of the collet with a threaded portion in the packer for locking the collet into such engagement. The plug is positioned in the packer and actuated to a locking position by use of a setting tool which has a portion press fit on a ring spring mounted on the operating mandrel. Once the collet is in the locked position, the setting tool may be removed from the ring spring. The plug may be retrieved by a retrieving tool which has a collet which engages the ring spring. The retrieving tool is used to actuate the operating mandrel to disengage the collet from the threaded portion of the packer and then to retrieve the plug from the packer.

Abstract: Methods and apparatus are provided for retrieving an inflatable packer or bridge plug of a type which may be passed through a small diameter tubing, seal against a relatively large diameter casing by passing fluid to the packer through a remedial tubing to inflate an elastomeric packing element and then be retrieved to the surface through the small diameter tubing by deflating the elastomeric packing element.Circulation may be maintained during run-in through an open port in a centralizer member provided on the bottom of the packer or bridge plug. If the device is used as a bridge plug, the open port is closed by dropping a ball and applying pressure through the tubing to permanently close the open port preliminary to inflating the elastomeric elements.

Abstract: The present invention relates to a method and apparatus for cementing a liner in a well bore having a casing wherein the liner is connected to a running tool and includes hanger means for securing the liner to the casing in the well bore. The liner includes an upper and lower liner portion each having port means therein and means to lock the telescoping liner portions against relative longitudinal movement to prevent premature actuation or operation of the port means.The liner portions provide a mechanically actuated port arrangement to be employed with first and second liner wiper means and first and second pump down plug means for cementing above a packer on the lower liner portion, or for providing dual stage cementing.

Abstract: A setting assembly tool suitable for suspension in a subterranean well by a wireline is provided for activating an inflatable packer. A downhole firing head with a combustion device is utilized for generating downhole a high fluid pressure in a passageway of the setting assembly tool, with the passageway being in fluid communication with the packer for setting the packer. In response to a pressure buildup of a predetermined level, fluid pressure is dumped from the passageway to the well while a check valve closes to retain the packer in the set position. To deactivate the retrievable packer, a conventional fishing tool supported by a wireless may be used to exert an axial force on a housing sufficient to move the housing relative to the packer and open a fluid port for discharging liquid from the packer. The setting assembly tool may be retrieved to the surface via the wireline immediately after the packer is set.

Abstract: Apparatus including a side pocket mandrel for inclusion in a well tubing string for removably receiving an instrument in its offset receptacle bore for monitoring at least one parameter such as pressure, temperature or the like, at a downhole location, there being an electrical conductor wire extending from equipment at the surface downward to the side pocket mandrel and a plug in the lower end of the receptacle for electrically connecting the instrument in the receptacle with the conductor wire extending from the surface so that electrical energy may be transmitted downhole to power the instrument, that the instrument may generate electrical signals representing data sensed in the well and transmit them to the surface for processing and immediate display, printout, or storage. Suitable kickover tools and running tools are also disclosed.

Abstract: A hydraulic setting tool for packers. The setting tool comprises a case with a ball valve therein, a bypass passageway for bypassing around the ball valve when the ball valve is in a closed position, a fill valve for closing the bypass passageway when desired, and a packer setting sleeve for hydraulically setting a packer attached below the setting tool. The fill valve is preferably characterized by a sliding sleeve valve annularly disposed on a stationary mandrel in the case and is movable in response to a pressure in the tool. The packer setting sleeve is attached to a setting piston which may be actuated in response to a first differential pressure between the tool string and a well annulus. A slidable mandrel is provided in operative association with the ball valve and is movable in response to a second differential pressure between the well annulus and the tool string.

Abstract: A device for use in setting a liner in a well casing is disclosed which utilizes a setting sleeve connected to the top of the liner, which setting sleeve has an annular sealing flange located on the outer surface thereof. A tubular flaring sleeve fits over the outer diameter of the top of the setting sleeve, and a beveled end on the bottom of the flaring sleeve is used to flare the annular sealing flange radially outwardly in a uniform manner since the beveled end will always remain aligned with the annular sealing flange. In addition, when the setting device and liner are being lowered into the well casing, the flaring sleeve is locked in an upward position on the setting sleeve preventing premature flaring of the annular sealing flange prior to installation of the liner at the bottom of the well.

Abstract: The hydraulic setting tool of the present invention comprises an adapter, housing, piston, piston sleeve and shear sleeve rod.

Abstract: An adjustable collet is shown which includes a collet body having an internal bore and integral collet arms. An adjustment ring is received within the bore of the collet body and has a depending portion which engages the collet arms. By adjusting the position of the ring within the collet body bore and varying the longitudinal position of the depending portion relative to the collet arms, the effective collet arm length can be varied.

Abstract: A hydraulically actuated running and setting tool includes a stationary setting tool mandrel that is connected to the packer by releaseable collets. Variable volume chambers are provided in the tool that are arranged so that no downward movement of the components relative to the space in the well bore below the packer is necessary. Setting is accomplished by hydraulic pressure and testing of the packer can occur prior to release of the setting tool from the packer. Release of the setting tool from the packer occurs by pulling upwardly on the setting tool with equalization of the pressure above and below the packer or applying additional hydraulic pressure as in setting until sufficient force is developed to part a shear member.

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: In an oil or gas well, a cement retainer setting tool for setting and pumping cement therethrough includes an inner piston defining a bore and an activation sleeve carried on the piston and defining an annular space between the piston and sleeve. A sleeve ring is formed inwardly from the activation sleeve and is positioned within the annular space beween the piston and the sleeve. Ports are provided to the piston above the sleeve ring for communicating a retainer setting pressure to the sleeve ring to move the sleeve downwardly relative to the piston upon application of such pressure. A plug means for plugging the lower end of the piston is provided therein. The plug means is disengagable upon application of a predetermined pressure greater than the retainer setting pressure. A second port structure is provided for connecting the lower end of the piston to a cement retainer, or other tool.

Abstract: The fixation of a packer or other borehole device is provided by explosively bonding the device to the borehole casing in the desired location. The explosively set packer is oriented in the borehole casing on a setting tool which preferably includes a casing scraper to clean the interior surface of the borehole casing, a removable packer to trap a gas pocket in the area where the explosive bonding is to occur and a gas transfer apparatus to form a gas pocket below the removable packer after the removable packer has been set.

Abstract: Apparatus for treating an isolated zone of a well bore includes primary and secondary tubing strings extending from the surface of the well releasably connected to a packer that has been set therein. The primary tubing string extends through the packer whereby the well can be produced or chemical can be injected to treat the isolated zone. The secondary string is of substantially smaller size and is arranged so that it is isolated from the primary tubing string which extends through the releasable connection and through the packer whereby inhibitors, diluents, and the like can be injected in the zone to be treated.

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 reperforable bridge plug fastenable to a tool through a weak point and integrated by an elastic gasket between support and compression pieces has a dentated fastener for fastening to a tube line, a bridge plug having a tubular body with upper and lower ends, an enlarged diameter hollow portion on the lower end portion of the bridge plug forming a chamber, a plurality of slots through the wall of the chamber so that it communicates with the exterior of the bridge plug body, a plurality of calibrated rings formed by enlargements of the exterior surface of the wall calibrated to fit the well diameter in which the bridge plug is to be applied, an interchangeable converter plug mounted in the end of the tubular body adjacent the enlarged portion between the chamber and tubular body, a lower compression piece located below the elastic gasket and fastened to the tubular body by a fuse pin and having an external frusto conical surface thereon, a frusto conical surface on the exterior of the enlarged diameter portio

Abstract: In the field of well drilling, completion and production in the petroleum industry a particular type of retrievable packer is commonly set by the application of "pull-push" force which may be derived from a conventional electric wireline setting tool of the pressurized type. The present invention provides a packer retrieving tool that is capable of effective use in retrieving the abovementioned type packer through use of "pull-push" forces derived from a conventional electric wireline setting tool. The retrieving tool of the present invention additionally includes effective provisions to be utilized in the event of malfunction of the electric wireline setting tool.

Abstract: A retrievable subsurface well conduit engaging apparatus having releasable engaging means which are movable outwardly to engage a well conduit and which may be released by up and down movement of an operating means. Locking means maintains the well conduit engaging means in engagement with the well conduit until the operating means is moved upwardly which releases a coupling means from the locking means and allows disengagement of the apparatus.

Abstract: A torque multiplier subsea tool for setting a seal between a casing hanger and a subsea wellhead includes a mandrel having a sun gear with axial elongate teeth. An outer barrel is disposed around the mandrel forming an annulus therebetween. A planetary gear assembly is disposed in the annulus between the barrel and the sun gear to transmit to the barrel a torque which is higher in magnitude than that applied to the mandrel. A connector body disposed around the mandrel, below the planetary gear assembly, includes radially movable dogs for engaging the casing hanger. The barrel engages the sealing assembly and transmits the increased torque thereto to advance the sealing assembly downwards and to set the seal. The mandrel advances downwards with the sealing assembly and releases the dogs from the casing hanger. An emergency release mechanism is provided to advance the mandrel downwards to release the dogs in the event such downward movement is prevented during normal seal setting operation.