Abstract: A lubricator for use with a coiled tubing injector comprising an elongated housing having a first end and a second end. There is a guide system disposed in the housing for guiding coiled tubing passing through the housing, a first director proximal the first end of the housing to direct the coiled tubing in a first direction and a second director proximal the second end of the housing to direct the coiled tubing in a second direction.

Abstract: An enclosed coiled tubing apparatus which includes a mobile trailer and a coiled tubing unit releasable coupled thereto, and a enclosure to maintain an adequate temperature, where the coiled tubing unit includes a coiled tubing injector postionally fixed relative to a coiled tubing reel so as to move together relative to the trailer as an integral unit. The coiled tubing reel and injector may travel laterally on the trailer on a track. Also included are methods of extending a wellbore in a subterranean formation by: translating a coiled tubing unit within an enclosure to a first position and then inserting a bottom hole assembly (BHA) into the wellbore using a lifting system, and wherein the coiled tubing unit includes coiled tubing; and translating the coiled tubing unit to a second position and then coupling the coiled tubing to the BHA and operating the BHA to extend the wellbore.

Abstract: A gripper block for conveying continuous rod in a well bore comprises a carrier body formed of a first metal and arranged to be mounted on one of the pair of continuous drive chains of a continuous rod conveying apparatus. A gripping element supported on the carrier body is arranged to engage the continuous rod and is readily separable from the carrier body. The gripping element is formed of a second metal which is softer than the first metal of the carrier body and softer than the continuous rod.

Abstract: A selectably elevatable coiled tubing injector is described that is suitable for a mobile self-contained unitized coil tubing rig for the drilling and workover of petroleum wells. The selectably elevatable coiled tubing injector includes a mechanism for positioning a trailer mounted coiled tubing injector either in a first stowed position on the deck of the transport trailer or in a second position resting on an elevated rig floor of a drilling rig. Furthermore, the selectably elevatable coiled tubing injector includes a further mechanism for selectably elevating the injector above its second position on the rig floor while clamping the tubing in order to provide additional tension on the tubing string or to raise the tubing deployed within a well.

Abstract: A drive assembly for inserting hose within a wellhead housing that intermittently reciprocates the hose feed into the housing. The intermittent reciprocating action feeds the hose past obstacles in the wellhead housing, such as within annuluses between tubulars. The drive assembly includes rollers that frictionally contact the hose and when rotated drive the hose forward. The rollers are rotated by a drive sprocket that is rotated by a hand crank. An offset cam assembly between the hand crank and the drive sprocket adds an orbital/reciprocating motion to the drive assembly.

Abstract: A method of automatic drilling of a well with coil tubing or drill pipe tubing utilizes AC motors coupled to variable frequency drives controlled by a programmable logic controller. For example, a coil tube injector is supported in a mast for injecting coil tube from a reel and into a wellbore for drilling the wellbore. The AC motors for the injector are driven for controlling a rate of injection of coil tube by the injector for maintaining at least one drilling parameter such as weight-on-bit, differential mud pressure or rate of penetration. The AC motor for the reel is also controlled for driving the reel and maintaining a relative rate of coil tube supplied from the reel to the injector. Drawworks and a top drive supported by the draworks can also be equipped with AC motors and variable frequency drives for controlling a drilling rate for maintaining at least one of the drilling parameters.

Abstract: An improved coiled tubing injector head, comprising a plurality of powered chain loops (1), each having one practically straight side adjacent to the other chain loop(s) and biased against a tubing (2) running in-between all the loops so as to grip the tubing and allow its transit into and out of a well. The chain loops are assembled from multifunctional links (23, 24) which both transmit drive and also form carriers for replaceable gripper blocks or are the carriers and gripper blocks combined, without need of a roller link chain or chains in addition to the multifunctional links. Three or more chain loops are provided, and the chain loops are driven by electric motors.

Abstract: A tubing injector head, includes a main body adapted for mounting on a well. A pair of gripper chain supports are mounted to the main body. Each gripper chain support has an upper chain sprocket at an upper end and a lower chain sprocket at a lower end. A drive motor drives the upper chain sprocket to move a gripper chain along a bearing surface. A tubing channel is positioned between the gripper chain supports. Telescopic cylinders are provided for creating relative movement of the gripper chain supports, while maintaining the first bearing surface and the second bearing surface in parallel spaced relation. The telescopic cylinders move the gripper chains into or out of engagement with tubing positioned in the tubing channel.

Abstract: A tubing injector unit for use in inserting and withdrawing coiled tubing from a well bore hole having in its structure a tubing injector component, a gooseneck component and a mounting component for connection of the overall unit to a supporting structure such as a mast. The mounting component has an upper area for carrying the gooseneck component thereon and a lower underside area forming an injector component supporting structure. The unit in operation thereby supports the injector component in a suspended condition beneath the mounting component so that the working forces which develop in inserting and withdrawing tubing in a bore hole are transferred separately to the mounting component by the injector component and the gooseneck component and thus directly to the supporting structure by the mounting component.

Abstract: A lubricator for use with a coiled tubing injector comprising an elongated housing having a first end and a second end, a guide system disposed in the housing for guiding coiled tubing passing through the housing, a first directo proximal the first end of the housing to direct the coiled tubing in a first direction and a second director proximal the second end of the housing to direct the coiled tubing in a second direction.

Abstract: The disclosed invention is an apparatus for injecting tubing into a well while sensing wear within the apparatus, along with a method for sensing wear, according to which the tubing is engaged by a chain and the linear motion of the tubing and the chain is sensed.

Abstract: A rig (10) for selectively inserting coiled tubing or threaded tubulars into a well includes a mast (14) extending upward from a mast carrier (12), and a coiled tubing injector (16) and a coiled tubing reel (26) supported on a coiled tubing carrier (28) separate from the mast carrier. The mast (14) may be pivotal on the mast carrier to attach the coiled tubing injector 16 to the mast while the injector is supported on the coiled tubing carrier.

Abstract: The rig (10) is provided for electively inserting either coiled tubing or a threaded tubular through a rig floor and into a well. The rig includes a coiled tubing injector (16) supported on a mast (14) when in an operative position to insert coiled tubing into the well, and a top drive (18) movable along an axis of the mast when in an operative position to insert the threaded tubular into the well. The rack or support (20) is secured to the mast for receiving a plurality of substantially vertical threaded tubular joints therein when the mast is in an operative position. Tubular joints may be moved between the top drive and the tubular support when running threaded tubulars into or out of the well.

Abstract: A pressure compensated tubing injector for injecting coiled tubing into a subsea wellhead or flowline. A traction device including grippers carried on respective opposing chain loops provides gripping engagement with the coiled tubing to longitudinally move the coiled tubing. A plurality of sealed outboard bearing assemblies guide movement of the chain loops. A drive unit powers the chain loops and includes a sealed gear case. One or more pressure compensators are placed in communication with the sealed gear case and one or more of the bearing assemblies, to compensate for subsea pressure and prevent intrusion of seawater. The bearing assemblies may include self-contained pressure compensators.

Abstract: A pipe handling apparatuses is suspended between the bails of a rig to raise, lower and laterally move a single joint of pipe that is being added to a string of pipe extending into a well.

Abstract: A continuous well string injection unit and balancing system, in which the continuous well string injection unit is suspended using a sling connected to a pair of suspension points. The balancing system comprises a length-adjustable member connected to the rod injector at a third suspension point, and a controller for adjusting the length of the length-adjustable member.

Abstract: A method and apparatus for holding and turning a tubular and string of tubulars, such as casing, for make-up and drilling with the tubulars are disclosed. The apparatus generally includes a spear and a clamping head, both of which are mounted to a top drive. The spear and the clamping head can be engaged to transmit torque therebetween from the top drive. In addition, an aspect of the invention provides variable height wickers positioned on slips to enable use of the slips with variable inner diameter (ID) and weight casing without deformation or rupture of the casing. Still further, a casing collar is also provided to provide reinforcement to the casing in the area of slip contact with the casing ID.

Abstract: The rig for selectively inserting coiled tubing or a threaded tubular through a rig floor 13 and into a well includes a mast 15 extending upward from the rig floor and movable between a threaded tubular position and a coiled tubing position. A top drive 21 is movable along an axis of the mast to insert the threaded tubular in the well when a top drive axis 42 is substantially aligned with the axis 44 of the well. Injector 17 supported on the mast inserts coiled tubing into the well, with the injector having an axis 46 offset from the top drive axis and substantially aligned with the axis of the well when the mast is in the coiled tubing position. A powered drive 54 is provided for selectively moving the mast between the threaded tubular position and the coiled tubing position.

Abstract: The rig for selectively inserting coiled tubing or a threaded tubular through a rig floor 13 and into a well includes a mast 15 extending upward from the rig floor and movable between a threaded tubular position and a coiled tubing position. A top drive 21 is movable along an axis of the mast to insert the threaded tubular in the well when a top drive axis 42 is substantially aligned with the axis 44 of the well. Injector 17 supported on the mast inserts coiled tubing into the well, with the injector having an axis 46 offset from the top drive axis and substantially aligned with the axis of the well when the mast is in the coiled tubing position. A powered drive 54 is provided for selectively moving the mast between the threaded tubular position and the coiled tubing position.

Abstract: A hydraulic circuit and method for operating a gripping mechanism according to which fluid is passed from a source to the device while some of the fluid is passed to a valve that is adjustable to control the amount of fluid passed to it and therefore the amount of fluid passed to the device.

Abstract: A tubing injector apparatus for use with variable diameter tubing. The apparatus comprises a pair of carriages which may be moved transversely and pivotally with respect to one another by actuating hydraulic actuator cylinders. A hydraulic control system uses relief valves to maintain a substantially constant pressure in the actuator cylinders when a tapered connector in the tubing passes between the carriages. A gripper chain in each carriage has gripper blocks to grippingly engage the tubing. A linear beam supports the gripper chain and has a plurality of resiliently biased segments therein to help maintain better contact with the tubing when the tapered connector passes through.

Abstract: An apparatus and method for moving a tubing along a path, according to which the tubing is engaged by an outer chain which is driven to advance the tubing. The chain is adapted to be deflected radially in response to an increase in the diameter of the tubing, and a plate is compressed in response to the deflection of the chain to accommodate the variation in diameter.

Abstract: A tubing injector (10) includes a traction device (12) having opposed grippers (14) laterally moveable so as to move a respective chain link member (16) of an endless loop chain into gripping engagement with the coiled tubing. A drive motor (11) is provided for powering the endless loop chain, and a plurality of roller bearings (20) each act between a respective chain link member and a gripper. A pressure compensating device (30) subjects fluid in a fluid passageway in the roller bearing (20) to a fluid pressure functionally related to subsea pressure. The tubing injector may be used for injecting the coiled tubing subsea into a wellhead or into another flowline.

Abstract: A continuous feed injection unit used for example for injection and removal of continuous well string from wells operates in a dual speed configuration. The unit comprises a first hydraulic motor, a second hydraulic motor, cooperating continuous well string gripping chains connected to be driven by the first and second hydraulic motors, a hydraulic power supply connected to provide pressurized fluid to the first and second hydraulic motors and a control system for the hydraulic power supply. The control system for the hydraulic power supply has a motor speed control valve with at least a first and second operating configuration, the first operating configuration providing power fluid to the first and second hydraulic motors in parallel and the second operating configuration providing power fluid to the first and second hydraulic motors in series. The hydraulic power supply may be a conventional power tong hydraulic supply.

Abstract: A hydraulic circuit and method for operating a hydraulic device according to which fluid is passed from a source to the device while some of the fluid is passed to a valve that is adjustable to control the amount of fluid passed to it and therefore the amount of fluid passed to the device.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: An improved V-style gripper block to better accommodate a variable outer diameter material (e.g. cable, plastic, wire, or pipe). The gripper block comprises a block body being connectable to a gripper chain in an injector apparatus, a gripper plate having arcuate and/or angled gripping surfaces for engaging tubing of various outer diameters, and a flex layer disposed between the gripper plate and the block body to allow the gripping surface of the gripper plate to move relative to the block body to which it is attached. This relative movement allows the gripping surface of the gripper block to rapidly conform to changes in the outer diameter of coiled tubing. In various embodiments, the flex layer may be formed of elastomeric materials including natural or synthetic rubber; an encapsulated gel or liquid within a flexible membrane; or mechanical means such as springs.

Abstract: A continuous well string injection unit, comprising a pair of motor driven continuous chains mounted opposed to each for gripping coiled rod between them. Plural links are connected end to end in each one of the pair of motor driven continuous chains, in which each link comprises a connected yoke and a neck, the neck of each link being sized to fit within the yoke of a succeeding link in the motor driven continuous chain with consecutive links connected by a pin extending through the neck of one link and the yoke of the next succeeding link. A method of injecting coiled rod into a well is also provided.

Abstract: A device for intervention of a subsea oil and/or gas well by means of a tool (8) suspended by a cable (9), fed from or withdrawn to a vessel (1) and driven by a drive mechanism (12) located on the vessel. The device comprises a lubricator (5) having a tool housing for the insertion of the tool into the well, and a stuffing box (40) sealing around the cable after the tool is inserted into the well. According to the invention an injector which drives the cable in the well is located on the lubricator, and is controllable independently of the drive mechanism for the cable located on the vessel. The drive mechanism and the injector may be synchronized in a manner, among others, providing that the cable is hanging in a predetermined arc during the intervention, whereby the vessel may be moved from the well. Moreover, the invention relates to a method and a cable used together with the device.

Abstract: An improved V-style gripper block to better accommodate a variable outer diameter material (e.g. cable, plastic, wire, or pipe). The gripper block comprises a block body being connectable to a gripper chain in an injector apparatus, a gripper plate having arcuate and/or angled gripping surfaces for engaging tubing of various outer diameters, and a flex layer disposed between the gripper plate and the block body to allow the gripping surface of the gripper plate to move relative to the block body to which it is attached. This relative movement allows the gripping surface of the gripper block to rapidly conform to changes in the outer diameter of coiled tubing. In various embodiments, the flex layer may be formed of elastomeric materials including natural or synthetic rubber; an encapsulated gel or liquid within a flexible membrane; or mechanical means such as springs.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: A modular work system permits Rig Up time to be substantially reduced by reducing the number of crane lifts required to offload equipment for a transport boat or vehicle. This is achieved by developing transport skids capable of holding multiple system components. The number of equipment components that must be mechanically coupled on location is reduced by pre-assembling the components and maintaining the assembly in operating condition during storage and transport. Skid design concepts are employed, wherein a skid system carries various pre-assembled components for transport, storage and operation. Specifically, a skid sub-system includes various related components. The components are either pre-assembled or are designed to complete a sub-assembly through final assembly on the rig. The skid is moved into place using the crane, and the assembly is completed. Additional sub-systems are mounted on additional skids which are designed to be mated with the other related skids and sub-assemblies.

Abstract: Enhanced horizontal drilling systems and methods encompass the production of crude oil from wells drilled from a subterranean production facility. This approach has the location of the well head below the oil reservoir to improve flow rate and recovery due to the consistent voiding of fluids by gravity flow within the well bore to the well head allowing well bore production pressure to achieve extremely low fluid pressure or even a vacuum of up to 15 PSI. This method increases oil recovery rate and factor, and lowers production costs. The present method is production of shallow crude oil by way of long horizontal or near horizontal boreholes drilled and serviced from a subsurface workroom. The subsurface workroom serves as both the drilling platform and the place to which production is centrally accumulated from the wells. Oil is collected in a central facility and is then lifted to the surface utilizing pumps.

Abstract: A continuous well string injection unit, comprising a pair of motor driven continuous chains mounted opposed to each for gripping coiled rod between them. Plural links are connected end to end in each one of the pair of motor driven continuous chains, in which each link comprises a connected yoke and a neck, the neck of each link being sized to fit within the yoke of a succeeding link in the motor driven continuous chain with consecutive links connected by a pin extending through the neck of one link and the yoke of the next succeeding link. A method of injecting coiled rod into a well is also provided.

Abstract: A tubing injector (10) includes a traction device (12) having opposed grippers (14) laterally moveable so as to move a respective chain link member (16) of an endless loop chain into gripping engagement with the coiled tubing. A drive motor (11) is provided for powering the endless loop chain, and a plurality of roller bearings (20) each act between a respective chain link member and a gripper. A pressure compensating device (30) subjects fluid in a fluid passageway in the roller bearing (20) to a fluid pressure functionally related to subsea pressure. The tubing injector may be used for injecting the coiled tubing subsea into a wellhead or into another flowline.

Abstract: A coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the coiled tubing from the well is described. The apparatus includes a base with a pair of spaced-apart carriages extending upwardly therefrom. The base is part of a frame positioned above a wellhead. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriages to move toward and away from one another in a lateral or transverse direction with respect to the superstructure and the base. Thus, the gripper chain systems comprises gripper chains that can be engaged or disengaged from the coiled tubing extending through the apparatus. A wetting fluid basin is positioned below the gripper chains, and support guides engage the coiled tubing below the gripper chains to prevent buckling of the coiled tubing.

Abstract: The disclosure describes a spoolable compliant guide, a system including a spoolable compliant guide and injector and methods for using the compliant guide, where the guide is designed to connect at one end to the injector and at its other end to a remote installation having a seal and to allow coiled tubing to be inserted into the installation through the seal. Because the guide permits a substantial distance to exist between the injector and the installation seal and functions as a crimp or band resistor for the coiled tubing, the guide enables the injector to be conveniently positioned remote from the installation such as a wellhead and assumes a compliant shape between the injector and the installation allowing dynamic relative movement between them without the use of heave compensators. Thus, for subsea installations, the injector, its control system and coiled tubing reels can all be located on the water's surface for ease of access and maintenance.

Abstract: A gooseneck for coiled tubing operations have a folding design to allow for a more compact design for storage and transport. The gooseneck may remain attached to the injector during transport, thereby decreasing the equipment required to move and set-up the coiled tubing equipment. The gooseneck includes a linkage mechanism for connecting a pair of support struts between the injector body and the tubing guide. The linkage allows the guide to follow a substantially parabolic path as it tracks the tubing from the reel to the injector.

Abstract: A continuous feed injection unit used for example for injection and removal of continuous well string from wells operates in a dual speed configuration. The unit comprises a first hydraulic motor, a second hydraulic motor, cooperating continuous well string gripping chains connected to be driven by the first and second hydraulic motors, a hydraulic power supply connected to provide pressurized fluid to the first and second hydraulic motors and a control system for the hydraulic power supply. The control system for the hydraulic power supply has a motor speed control valve with at least a first and second operating configuration, the first operating configuration providing power fluid to the first and second hydraulic motors in parallel and the second operating configuration providing power fluid to the first and second hydraulic motors in series. The hydraulic power supply may be a conventional power tong hydraulic supply.

Abstract: The present invention is an auxiliary chain for drawing assemblies including at least a track formed by multiple contiguous links able to act on a product to draw it. The auxiliary chain is interposed between the relative track and support the auxiliary chain including multiple contiguous links, each link including an idler roll equipped with an axial hole, a join pin and two connection elements each suitable to cooperate with a respective end of the idler roll.

Abstract: A flow-limiting device is placed in a hydraulic fluid circuit between a hydraulic pump of, for example, a power pack, and a motor of a coiled tubing injector. The flow-limiting device allows hydraulic fluid to flow through the circuit, but limits the rate of flow in order to avoid thermal damage to the motor.

Abstract: A coiled tubing injector head comprised of a plurality of endless chains, each of which are at least three links wide, that are positioned around a plurality of sprockets and/or idler rollers within the injector head. A plurality of gripper assemblies are positioned around the middle links of the endless chains. A bearing skate is positioned within the injector head, the bearing skate be comprised of a plurality of bearings in a staggered configuration, the bearings being adapted for rolling engagement with a portion of the gripper assemblies. An injector head is comprised of a plurality of halves, each of the halves being coupled to a positioning bar, the positioning bar having a plurality of openings formed therein, the openings adapted for use in varying the distance between the first and second halves.

Abstract: A coil tubing injector assembly includes a frame structure and a pair of gripper chain drive systems mounted to the frame structure. The pair of gripper chain drive systems are disposed in a common plane and spaced apart from each other, and adapted to engage a first and a second coil tubing string to inject both of the first and second coil tubing strings into, and withdraw both the first and second strings from, a subterranean well. The first and second coil tubing strings may be injected synchronously or asynchronously depending on the structure of the injector. The coil tubing injector assembly reduces the time required to perform many downhole operations, and therefore reduces well completion, stimulation and re-completion expenses.

Abstract: A seal assembly for dual string coil tubing injection into a subterranean well includes a seal plate having first and second bores with annular seals for providing a high-pressure fluid seal around first and second coil tubing strings inserted through the respective bores. The seal plate is adapted to be connected directly to a wellhead, or a lubricator if a downhole tool is connected to either one, or both of the first and second coil tubing strings. The seal assembly further includes passages for supplying lubricant to the first and second annular seals to lubricate the respective seals while the respective first and second coil tubing strings are injected into and extracted from the wellhead.

Abstract: The present invention includes an interchangeable coil tubing support block that provides a means for quickly adapting a wheel system for wheel-type coiled tubing injectors for a wide variety of tubing sizes. In addition, the present invention provides a light weight, robust, and wear resistant means of contacting and fully supporting the tubing while it is being injected into and withdrawn from a well.

Abstract: A gripper block for use in an endless chain in a device for moving a generally cylindrical object longitudinally, as into or out of a well. The block has a first portion adapted to engage the endless chain and a second portion adapted to frictionally engage the object. At least a portion of the block is made from a resilient material that engages the tubing.