Abstract: Apparatus for recompleting an oil and/or gas well includes a primary tubing hanger, and primary well tubing hung from the hanger within the well, and a communication/hanger nipple, located below the primary tubing hanger, which is suitable for receiving and locating a coiled tubing hanger. The communication/hanger nipple is run into the well as part of the initial completion in any situation where there is a potential requirement for a coiled tubing completion later in the life of the well but plays no part in the normal primary production operation of the well. However, should production fail for any reason, requiring coiled tubing recompletion, the communication/hanger nipple is available to support the coiled tubing and provide communication to the subsurface equipment without the necessity of modifying the primary tubing hanger.

Abstract: A plurality of electronically controlled downhole tools and systems for use in production wells is presented. These tools and systems include safety valve and pressure monitoring systems, remotely controlled inflation/deflation devices, remotely actuated downhole tool stop systems, remotely controlled fluid/gas control systems, remotely controlled variable choke and shut-off valve systems and a retrievable sensor side pocket mandrel.

Abstract: This invention is directed toward apparatus and methods for gathering liquid samples from a reservoir of liquid using a submersible pump and subsequently retrieving the samples for analysis. The invention is more specifically directed toward the gathering and preparing of water samples for analysis for tritium content, where the samples are collected from underground formations penetrated by a borehole or collected at varying depths in surface canals and the like. The samples are subsequently transferred to the surface of the earth for analysis. The submersible pump is operated by means of a surface valving system and a valving system mounted on the submersible pump. The pump inlet valve is set to open or "crack" at a predetermine pressure, however the pump is not filled until a vacuum is applied to the pump. After filling, the pump is purged thereby transporting the sampled liquid to the surface by applying pressure.

Abstract: A plurality of electronically controlled downhole tools and systems for use in production wells is presented. These tools and systems include safety valve and pressure monitoring systems, remotely controlled inflation/deflation devices, remotely actuated downhole tool stop systems, remotely controlled fluid/gas control systems, remotely controlled variable choke and shut-off valve systems and a retrievable sensor side pocket mandrel.

Abstract: An improved polished rod for use in pumping a well has the characteristics of reducing inventory and warehouse space requirements. The polished rod is in the form of an elongated high strength cylindrical metal rod of uniform external diameter and adaptable for reciprocation in an oil well stuffing box, the exterior surface being adaptable to receive a clamp thereon by which the polished rod is reciprocated, and the polished rod having male threaded end portions at opposed first and second ends, either of which may be employed for threadable attachment to a female threaded upper end of a string of sucker rods suspended in a well. The first end portion having a thread of a first size for attachment to a sucker rod string having a female thread of mating size and the second end having a thread of a different, second size for attachment to a sucker rod string having a female thread of different, mating size whereby the polished rod may be employed for use with two different sizes of sucker rod strings.

Abstract: The invention provides apparatus for producing well fluids from an oil bearing formation penetrated by a well including a tubing string forming a production flow path for production fluids between the earth's surface and a location in the well suitable for receiving well production fluids, a power tubing parallel to the production tubing and connected to the flow path of the production tubing, a pump barrel formed in the power tubing, and a lubricating plunger in the pump barrel forming an annulus therewith and having ports to permit flow of lubricating fluids from the lubricating plunger into the annulus. The apparatus is provided with means for providing lubrication fluid to the lubricating plunger.

Abstract: A system adapted for controlling and/or monitoring a plurality of production wells from a remote location is provided. This system is capable of controlling and/or monitoring: (1) a plurality of zones in a single production well; (2) a plurality of zones/wells in a single location (e.g., a single platform); or (3) a plurality of zones/wells located at a plurality of locations (e.g., multiple platforms). The multizone and/or multiwell control system of this invention is composed of multiple downhole electronically controlled electromechanical devices and multiple computer based surface systems operated from multiple locations. Important functions for these systems include the ability to predict the future flow profile of multiple wells and to monitor and control the fluid or gas flow from either the formation into the wellbore, or from the wellbore to the surface.

Abstract: A release device for releasably coupling a first object to a second object includes a first member (10) adapted to be coupled to the first object and a second member (20) adapted to be coupled to the second objects. A latch mechanism (12, 21, 28) releasably couples the first member (10) to the second member (20). A time delay mechanism (22, 23, 24, 26, 27) permits the latch mechanism (12, 21, 28) to decouple the first and second members (10, 20) only after a time interval has elapsed from initiation of the decoupling of the first and second member (10, 20).

Abstract: Apparatus (50) for amplifying a load applied by a wireline to a tool in a borehold includes a housing (4). A first coupling device (51) couples the wireline to the apparatus (50) and a second coupling device (60) couples the tool to the apparatus (50). The second coupling device (19) is movably mounted within the housing (4) and the transmission mechanism (9, 14,16) interconnects the first and second coupling devices. The transmission mechanism permits a mechanical advantage and comprises a first linearly movable member (9) coupled to the first coupling device (51) and a second linearly movable member (16) coupled to the second coupling device (19). The first and second members (9, 16) are interconnected by a rotatable member (14) such that movement of the first member (9) rotates the rotatable member (14) to move the second member (16). The movement of the second member (16) is less than the movement of the first member (9) and so the apparatus (50) generates a mechanical advantage.

Abstract: A novel improved pump pulling system for pulling a pump from a deep well casing and including all the pipe normally attached to the pump. Pulling of the pump is normally required for maintenance purposes or for replacement of the pump. Normally such pumps are electrical and therefore an attendant electrical cable is also pulled with the pump when it is necessary to remove the pump from the well casing.

Abstract: The present invention provides a pumping system having separate parallel power tubing and production tubing strings in which production is pumped up the production tubing through a removable flow control valve and a rod operated insertable and removable pump is disconnectably connected into the power tubing wherein the insert type pump and the removable flow control means may be removed from and inserted into, respectively, the power tubing and the production tubing strings without the need to remove either tubing string from the well.

Abstract: A method and related system for operating a downhole tool connected to coiled tubing comprises introducing the tool and the coiled tubing into a wellbore providing to the earth's surface a signal indicative of compression, tension and/or impact forces applied to the tool, using the signal to determine at the earth's surface the location of the tool within the wellbore, and then operating the tool.

Abstract: A shut-off control system for an oil/gas well casing is described which is intended to protect a discharge manifold from which the oil or gas is extracted. An explosion-proof bunker is positioned below the ground level and contains a valve which can be opened to permit flow of oil or gas through the well casing or to a closed condition in which the flow is inhibited. An actuator is mechanically coupled to the valve. A normally inaccessible closure system is provided which is at least partially disposed below ground level and is connected to the actuator for selectively controlling the condition of the actuator to permit or inhibit the flow of oil or gas through the well. In one embodiment, a fail-safe system is described which includes hydraulic accumulators in the bunker and a control circuit for monitoring and sensing alarm or abnormal conditions for automatically applying energy stored in the accumulators to the actuator to automatically close the flow of oil/gas in the well.

Abstract: The oil well pump power unit is provided with a drive for reciprocating the sucker rod of an oil well pump. The rod (18) is fixed to a transverse beam (23) which is integral with ball nut housings (4), one at each end of the beam (23). The ball nuts (2) mounted in the housings (4) engage--in a frictionless, ball bearing type engagement--each a drive ball screw (1). The screws are driven concurrently by a drive motor. The advance in the art is in that this unit has a light weight and requires minimum driving power. Due to its light weight, it can easily be installed without special requirements for the foundation etc. Also, the maintenance is simple as all moving components are entirely enclosed in a housing (26) or protected by bellows (5, 6).

Abstract: A wellbore tool is provided to perform work in a wellbore by converting a chemical pressure source into a force exerted over a distance. The wellbore tool includes a pressure chamber sealed by a firing head and containing a power charge which includes a plurality of chemical components which are burned in a combustion reaction to generate gas. The combustion reaction of the power charge is initiated by a resistance heater which directly initiates the combustion reaction by receiving electrical energy and generating heat. The combustion reaction generates gas within the pressure chamber, the gas having a pressure which pushes a pressure responsive member into movement relative to the pressure chamber for providing a force over a distance to operate a downhole tool.

Abstract: An everting membrane assembly defines a constant volume for traveling along a generally horizontal borehole, pipe, or the like, having two accessible ends, for sampling within the borehole on a continuous basis. A first everting membrane carries an extraction tube through the borehole. A second everting membrane contains a perforated pipe for attachment to the extraction tube. As the first membrane is inverted back through the borehole, the second membrane is everted, forming a sampling volume therebetween with the perforated pipe exposed in the sampling volume for withdrawing fluids through the extraction tube for analysis.

Abstract: A well tool having an elongate circular body with an enclosed fluid bore extending longitudinally therethrough. A fixed plate extends radially between the bore and the body and a rotatable piston extends between the enclosed bore and the body and is rotatable about the enclosed bore. A hydraulic control line extends longitudinally to a position between the plate and the piston for rotating the piston. The tool may be an orientation tool and include a rotatable mandrel actuated by the piston. A recocking spring is provided recocking the piston and valve means are provided in the hydraulic line for admitting and venting fluid from the piston.

Abstract: An improved electromagnetic coupling apparatus is advantageously utilized in conjunction with an oil well pump assembly. The electromagnetic coupling apparatus includes rotatable inner and outer shafts. A stationary annular coil assembly is supported on the outer shaft by bearings which allow the outer shaft to rotate relative to the coil. A pole piece drum extends around the outer shaft and is effective to concentrate magnetic flux conducted from the stationary coil. A rotatable eddy current drum extends around the pole piece drum. The pole piece and eddy current drums are fixedly connected with the inner and outer shafts. The inner and outer shafts extend in the same axial direction from the pole piece and eddy current drums.

Abstract: For obtaining liquids and/or gases contained in ground or rock formation, contaminants or useful substances, especially oils, at least one shaft is arranged in a corresponding region, a negative pressure is formed in the shaft provided with a casing having vertically spaced permeable and impermeable wall portions so as to produce a circulation of an available or introduced liquid from ground or rock formations through a first permeable wall region into the shaft, further in an axial direction of the shaft, and then through a second permeable wall region back into the ground or rock formations, gases entrained in the circulation of liquids are separated from the liquid by a negative pressure device, and a second shaft is arranged near the first mentioned shaft so that the circulations of liquid in the shafts touch or intersect one another.

Abstract: A retrievable packer 10 for isolating a selected depth of a wall of a borehole. The retrievable packer is comprised of a body member 12, a cylinder 32 surrounding the upper portion of the body member 12, and a sealing member 24 cylindrically surrounding the lower portion of the body member. The cylinder 32 and the upper portion of the body member 12 work in conjunction to provide a piston action which engages the sealing member 24 and causes the sealing member 24 to establish a seal with the wall of the borehole.

Abstract: A system for recovering subterranean fluids from a site contaminated by hazardous waste is disclosed. The system for recovering the fluids in a wellbore comprises pump unit means for pumping the subterranean fluid from the wellbore, liquid level sensing means for sensing the liquid level within the wellbore, and activation means for activating the pumping unit means in response to the fluid level sensing means. The system may also include microprocessor means for storing and interpreting the data from the sensing means.

Abstract: A safety valve landing nipple selectively provides a pin for closing communication in the bore between the first control line and the safety valve control line so that communication between the first control line and an insert safety valve in the landing nipple housing is achieved by use of a rotary member. A rotary shifting tool is used to rotate the rotary member so that a cam sleeve pushes a poppet pin to form a metal to metal seal with a fitting adaptor connecting the first control line and the safety valve control line so as to provide communication between the surface control line and the internal bore of the landing nipple.

Abstract: A subsurface well flow control system includes a series of movable sleeve type flow control devices installed in a well flow conductor at various fluid-containing fracture zones, and a shifter tool movable through the conductor and operable to selectively shift any selected number of the sleeve portions of the flow control devices, in either direction between their open and closed positions, without removing the tool from the conductor. Radially retractable anchor and shifter key sets are carried in side wall openings of the tool body, and are respectively configured to be lockingly engaged with interior side surface groove sets on the body and movable sleeve portions of any of the flow control devices. The key sets are spring-biased radially outwardly toward extended positions, and an electromechanical drive system disposed within the tool body is operative to radially retract the key sets, and to axially drive the shifter key set toward or away from the anchor key set.

Abstract: There is provided a dual pump floating layer recovery apparatus for pumping a floating layer of contaminant out of a well. The apparatus comprises an upper pump and a lower pump. The lower pump creates a cone of depression which increases the amount of the floating layer within the well. The upper pump pumps the contaminant from the well or cone of depression. The upper and lower pumps preferably are gas-actuated pumps. The lower pump preferably includes an automatic switching device to activate the lower pump upon sensing a predetermined amount of fluid within the pump. A gas conduit interconnects the actuation chambers on both pumps such that when the lower automatic pump is provided with pressurized gas, the upper pump is simultaneously provided with the identical pressurized gas. Upon deactivation, both pumps relieve the activation pressure through the lower pump.

Abstract: Apparatus for isolating the wellhead equipment from the high pressure fluids pumped down to the producing formation during the well servicing procedures of fracturing and acidizing oil and gas wells utilizes a central mandrel for pumping the fracturing and acidizing fluids through the wellhead equipment and into well tubing or casing. The mandrel is run into the wellhead equipment while enclosed in a pressure containment protection which includes the operating cylinder. The mandrel is locked in position in the wellhead equipment and later extracted from the wellhead equipment while fully enclosed in the pressure containment. The pressure containment mandrel protection and operating cylinder are removed during the well servicing process to give a low profile to the overall wellhead array.

Abstract: A metal to metal seal (10) is provided that comprises an annular seat (66), a seal member (90) having annular metal skirt (91) adapted to engage the annular seat (66), an undercut section behind the skirt (91), and an annular retainer member (78) disposed in the undercut section behind the skirt (91), the skirt (91) being adapted to deflect toward the retainer member (78) when pressured against the annular seat (66), the amount of deflection being limited by the angular distance between the skirt (91) and the retainer member (78). An annular stop member is provided (144) for optionally transferring excess bearing load around the skirt (91) and an adjustment member is provided (176) for selectively controlling the portion of the bearing load carried by the skirt (91) and to limit deflection of the skirt. Use of the subject metal to metal seal is (10) as a piston seal in surface controlled subsurface safety valves (38) employed in the oil and gas industry.

Abstract: A tubing retrievable safety valve, lockout tool and method of use are disclosed that are adapted to lock the valve open permanently and provide access to control line pressure by perforating the piston in the valve. The lockout tool comprises a track mandrel having a ramp slidably disposed beneath a punch that is adapted to penetrate the piston wall of the valve at a point adjacent to the control fluid annulus, thereby creating a protrusion adapted to lock the valve open and establishing fluid communication between the control fluid annulus and the valve bore.

Abstract: A method for taking samples from a groundwater monitoring site realized by measuring an electric conductivity of contaminated groundwater during operating a pump at high r.p.m. and by controlling a predetermined minimum variation of the electric conductivity over a predetermined period of time with subsequent operating of the pump at low r.p.m.

Abstract: Method and apparatus for pressurizing the top of the valve member of a subsurface safety to equalized pressure thereacross and assist in opening the valve. The apparatus includes a chamber filled with fluid under pressure which is admitted in to the space between the apparatus and a valve when landed in the valve to pressurized the valve. A spring loaded prong on the apparatus urges the valve member of the safety valve to open position. A latch is included which will bypass a top landing nipple and land in a second landing nipple. The subsurface safety valve is provided with means for filling its spring chamber with liquid with the valve closed. When the safety valve is open the spring chamber is isolated to protect the chamber from flow of fluids and solids.

Abstract: A system for placing instrumentation within a hole enables a wide variety of instruments to be placed in the hole with enhanced measurement resolution and minimum risk of becoming lodged in the hole by partial collapse of the hole wall. A flexible tubular member is pressurized and averted from a canister into the hole, turning inside out as it extends into the hole. The application of pressure urges the tubular member against the hole wall in the manner of a hole liner or packer. A wide variety of instruments can be attached to the membrane and urged against the hole wall for measurement purposes. Typical measurements include temperature, pore fluid extraction and injection, in situ sensing with fiber optics, pore fluid pressure, and the like.

Abstract: An electrical cable in which composite rods and electrical conductors disposed between a flexible, elongated, membrane which can be pressurized and a flexible outer protective sheath surrounding but separate from the membrane, provide a pressure stiffened cable assembly that can be run into deviated boreholes.

Abstract: The invention is an oil well capping device that may be forced into an oil well casing through which oil and/or gas under high pressure is emanating, to temporarily completely obstruct the flow of such oil until repairs to the well head structure have been completed before the device is removed, and includes a well sealing arrangement utilizing an axial compression system that causes elastomeric material elements mounted on an elongated shaft to radially expand and temporarily and safely seal off the well casing.

Abstract: An arrangement for driving out of volatile impurities from ground water and a ground region through which the ground water flows comprises a well shaft extending to a region with contaminated ground water and having at least partially water-permeable shaft walls, a unit for supplying fresh air under a ground water level into the well shaft, and at least one vibration generator which produces mechanical vibrations with a limited energy such that the vibrations cause molecular liquid movements in capillaries of ground layers adjacent the contaminated ground water and do not destroy the capillaries.

Abstract: A locking system utilizing metal seals for sealing and a rotary lock mandrel which is rotated to lock by a rotary running tool in a landing nipple in a well conduit. The lock mandrel has a metal sealing surface sealingly engageable with a metal seat in the landing nipple and orientors on a number of helically profiled segments which are rotatably engageable with mating profiled segments in the landing nipple. As the lock mandrel is lowered on the running tool into the landing nipple, lock mandrel segments are oriented between nipple segments, and the mandrel metal sealing surface engages the metal seat in the landing nipple. Downward jarring on the running tool rotates the mandrel segments into engagement with the landing nipple segments, locking the lock mandrel in the landing nipple, sealingly engaging the metal seal surface on the metal seat and releasing the running tool from the locking mandrel for retrieval from the well conduit.

Abstract: An improved mobile pumping apparaus for producing fluids from, for instance, shallow and/or slow-flowing marginal oil wells. The invention comprises a boom assembly which is adapted for mounting on a tractor, truck, or other vehicle having a standpipe mounted on the front thereof which is lowered into engagement with a wellhead and a winch having a cable attached at one end thereto, the other end of the cable extending down into the standpipe and having a swab bar attached thereto. The swab bar is provided with a heavy lead weight, so that the swab bar will sink down into the fluid as the cable is wound off of the winch, and a plurality of cups for lifting the fluid up out of the well when the direction of the winch is reversed. The oil is lifted up out of the well into the standpipe and on into a hose for collection in a storage tank.

Abstract: A hydraulic well tool for running into a flow conduit of a well on a handling string, such as reeled tubing or jointed pipe, for generating and applying an axial force to an object in the well, the well tool including an anchoring mechanism actuatable by fluid pressure in the handling string for anchoring the well tool in the flow conduit, this well tool further including a piston/cylinder arrangement also actuatable by fluid pressure in the flow conduit for moving the aforementioned object. The object may be a well tool, a sliding sleeve, a fish, or other well tool. The hydraulic well tool may be provided with a suitable device to permit increasing the pressure in the handling string for actuation of the anchoring mechanism and the piston/cylinder arrangement. Devices suitable for such purpose include a flow restrictor, ball and seat, velocity check valves, plugs, or the like devices.

Abstract: A sequence valve for directing fluid pressure is provided, having a fluid pressure inlet, a first actuator outlet with associated vent port, and a second actuator outlet with an associated vent port. A spool is movably mounted within the body for selective direction of fluid pressure applied to the inlet to either of the actuator outlets or selectively to bleed pressure applied to either of the actuator outlets through respective vent portions in a predetermined sequence.

Abstract: An invention relating to method and apparatus for the running of various tools and devices used to service oil and gas wells in combination with coiled tubing units that permits the application of a sudden downward force of predetermined magnitude.

Abstract: An expanding nipple, externally mounted packer has a body which mounts onto a stack of blowout preventers or a casing head and tubing spool or the like. The body contains an external locking mechanism and the upper ends of a pair of concentric mandrels which are lowered into the well casing, through the blowout preventer stack or other configuration of well head equipment. The outer mandrel has a deformable seal on its lower end and the inner mandrel has an expander on its lower end. A piston on the inner mandrel responsive to hydraulic pressure, raises the inner mandrel with respect to the outer mandrel so that the expander forces the seal outwards against the casing wall. The locking mechanism allows the seal to be locked in place. The hydraulic pressure on the piston is reversed to unseal the nipple.

Abstract: A wellhead isolation tool is presented which includes an expanding nipple operable from outside the wellhead and casing, the nipple and its concentric mandrels being inserted into the wellhead and thus down through the wellhead array and into the casing or tubing by a single hydraulic cylinder and then the nipple expanded and sealed in the casing or tubing. The cylinder and its support rods may be removed when the nipple and mandrels are in place.

Abstract: An improved wellhead isolation tool is presented which includes an expanding nipple operable from outside the wellhead and casing, the nipple and its concentric mandrels being inserted into the wellhead and thus down through the wellhead array and into the casing or tubing by a concentric hydraulic cylinder. The nipple is then expanded and sealed in the casing or tubing by a second concentric hydraulic cylinder. It is then locked in place both mechanically and hydraulically.

Abstract: An apparatus and method for selectively disconnecting a wireline from a downhole tool when the tool becomes lodged in an oil or gas well. The apparatus is directed to a wireline releasing device which includes a precharge chamber which can be pressurized to a predetermined amount for applying a force against a piston assembly located within the releasing device to hold together telescopically connected upper and lower tubular portions which are locked in place by retractable dogs which extend through aligned openings in the upper and lower tubular portions. The device is intended to be connected at one end to a length of wireline and, to another end, to the top of the downhole tool. During wireline operations, upon the downhole tool becoming lodged within the well, the wireline operator applies hydraulic or pneumatic pressure from the surface which exceeds the precharged pressure, which acts to disconnect the upper portion of the device from the lower portion and the downhole tool.

Abstract: A downhole tool is provided suitable for multiple setting and unsetting operations in a well bore during a single trip. The downhole tool is suspended in the wellbore from a tubing string, and is activated by dropping a metal ball which plugs the passageway through the tubing string, such that tubing pressure may thereafter be increased to activate the downhole tool. A sleeve is axially movable within a control sub from a ball stop position to a ball release position, and has a cylindrical-shaped interior surface with a diameter only slightly greater than the ball. Collet fingers carried on the sleeve are radially movable from an inward position to an outward position to stop or release the ball as a function of the axial position of the sleeve.

Abstract: A mechanical latching device for repeatable latching and unlatching of downhole well tools is adapted for use in a mandrel interconnected with a tubing string of a well, the mandrel forming a downwardly directed internal shoulder. The latch mechanism incorporates a fishing neck adapted for interconnection with the downhole tool. The fishing neck is disposed in upstanding generally centralized relation within the mandrel. A collet member which may be a component part of a well service tool or which may be a component part of the latch mechanism defines pulling shoulders at the free extremity of collet fingers defined thereby. A latch retainer is disposed in movable relation about the fishing neck and is movable between latched and unlatched positions relative to the fishing neck. In the latched position the latch retainer provides external support for the collet fingers to maintain the collet fingers in latching interengagement with a pulling flank.

Abstract: A power actuating tool for connection to a coil tubing having first and second conduits for supplying first and second fluids, respectively, to the power tool. A housing includes first and second lines for connection to the coil tubing. A fluid actuated holding mechanism is connected to the housing and to the first line for receiving the first fluid for holding the housing in the wall. A fluid power actuator is connected to the housing and in fluid communication with the second line for providing fluid power for actuating the fluid power actuator. A control mechanism is connected to the first line and controls the supply of the second fluid to the fluid power actuator.

Abstract: A device for positioning a tool or instrument in a duct and recovering the tool or instrument therefrom by causing a vector fluid to flow through the device. The device includes a tubular element adapted to be connected to the tool or instrument and an annular sealing arrangement mounted on the tubular element for sealing the tubular element in the duct. The tubular element includes an arrangement for selecting a direction of movement of the tool or instrument which includes a closing device for cooperating with a resilient conjugate piece and a device for reversing a direction of movement of the closing device. The cooperation of the closing device with the resilient conjugate piece occurs in at least three states. In the first state, the fluid flows through the tubular element in a first direction; in the second state, the fluid flow is stopped in a direction opposite to the first direction of fluid flow; and, in the third state, the fluid is stopped in the first direction.

Abstract: There is disclosed a well installation having an electrically responsive device a substantial distance beneath the wellhead and apparatus for supplying electrical current to the device from a source of alternating or time varying current outside the wellhead, which apparatus includes an electrical connector comprising a first coil on the outer side and a second coil on the inner side of a non-magnetic portion of a pressure containing wall of the well, whereby the supply of varying current from the source to the first coil forms an inductive coupling between it and the second coil of the connector.

Abstract: In accordance with the present invention there is provided a device for use in servicing an oil well rod pump. The pump has a rod string with a rod clamp secured thereto above the polish rod. The device comprises an elongated, weight-supporting polish rod-receiving cylindrical sleeve. The inner diameter of the sleeve is greater than the diameter of the polish rod. A slot in the side of the sleeve extends along its length. The width of the slot is slightly greater than the diameter of the polish rod. A flange extends outwardly from each side of the slot. Releasable securing means extend between the flanges to secure the sleeve in position about the polish rod. The sleeve is to receive, resting thereon when in position about the polish rod, the rod clamp to permit servicing work on the pump above the rod clamp.

Abstract: A mechanical latching device for repeatable latching and unlatching of downhole well tools is adapted for use in a mandrel interconnected with a tubing string of a well, the mandrel forming a downwardly directed internal shoulder. The latch mechanism incorporates a fishing neck adapted for interconnection with the downhole tool. The fishing neck is disposed in upstanding generally centralized relation within the mandrel. A collet member which may be a component part of a well service tool or which may be a component part of the latch mechanism defines pulling shoulders at the free extremity of collet fingers defined thereby. A latch retainer is disposed in movable relation about the fishing neck and is movable between latched and unlatched positions relative to the fishing neck. In the latched position the latch retainer provides external support for the collet fingers to maintain the collet fingers in latching interengagement with a pulling flank.

Abstract: A tube shaped sleeve apparatus which includes two cylindrical components adapted to be connected to each other and sections of tubing string by cooperating threads formed at the ends thereof. At spaced intervals in the periphery of the sleeve are a plurality of radial holes or ports and formed in the sleeve bore at opposite ends thereof are stops shoulders. Adapted to be inserted in slidable relation inside the bore of the tubing sleeve is a mandrel which includes a plurality of resilient O-rings or gaskets that are secured in the periphery of the mandrel inside annular grooves formed therein. Formed in the bore of the mandrel and at opposite ends thereof are a second set of stop shoulders. When positioned opposite the holes in the sleeve, the periphery of the mandrel and the gaskets form a tight seal with the wall of the sleeve bore to prevent fluids and gases from the well bore from entering and escaping the tubing sleeve.