Abstract: A threaded connection includes a pin member providing a single external thread comprising a first external portion and a second external portion, a box member providing a single internal thread comprising a first internal portion and a second internal portion, and a radial metal-to-metal seal to seal between the pin member and the box member, wherein the first and second internal portions threadably correspond with the first and second external portions, and wherein the first internal and external portions are characterized by a first wedge ratio and the second internal and external portions are characterized by a second wedge ratio, wherein the first wedge ratio is less than the second wedge ratio.

Abstract: Threaded connections including a pin member and a box member and a sealing metal. The pin member and the box member have wedge threads formed thereon, and the sealing metal is disposed between the wedge threads of the pin member and the box member. The sealing metal has a melting point lower than a tempering temperature of the pin member and the box member.

Abstract: A tubular connection is provided with a first thread on a first step having an initial makeup location and a second thread on a second step, the second thread being a wedge thread and having a selected clearance on stab and load flanks at the initial makeup location of the first thread.

Abstract: A threaded connection includes a pin member including a continuous external wedge thread having a first pin step, a mid pin step, and a second pin step and a box member including a continuous internal wedge thread having a first box step, a mid box step, and a second box step. The first pin step and the first box step correspond at a first wedge ratio, the mid pin step and the mid box step correspond at a transition wedge ratio, and the second pin step and the second box step correspond at a second wedge ratio. Upon selected make-up of the pin member with the box member, a clearance exists between corresponding thread flanks of at least a portion of the threaded connection.

Abstract: A method of treating a threaded connection that includes determining a treating time sufficient to form a thickness of a hopeite coating, coating at least a portion of the threaded connection with phosphating compound for a period of time sufficient to form the thickness of the hopeite coating is described.

Abstract: A threaded connection includes a first tubular, a second tubular, and a coupling. The first and second tubulars include external threads, a pin nose, a pin nose surface, a pin shoulder surface, and a pin seal surface located between the pin nose and pin shoulder surfaces. The coupling includes two internal threads corresponding to the external threads of the first and second tubulars and an inner seal support. Upon selected make-up, the pin noses overlap and contact occurs between the pin nose seal surfaces and the inner seal support is in an overlapping axial position with respect to the pin noses such that a diametrical gap exists therebetween.

Abstract: A threaded connection including a pin member and a box member, and methods for manufacturing and forming said threaded connection. The pin member has a pin thread with a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank. The box member has a box thread with a box thread crest, a box thread root, a box load flank, and a box stab flank. At least one of the pin thread crest, the pin load flank, the pin stab flank, the box thread crest, the box load flank, and the box stab flank has at least one perturbation formed thereon. Upon a selected make-up of the pin member with the box member, an increased contact stress exists between the pin thread and the box thread at the at least one perturbation.

Abstract: Tubular connections and methods of designing tubular connections having selected root/crest clearance when the box member and pin member are made-up. When the tubular connection is radially expanded, a thread seal is formed over at least part of the tubular connection.

Abstract: An electrically-insulative threaded connection includes a pin member having a pin thread and a box member having a box thread. An insulating composite layer is disposed between the pin thread and the box thread. The insulating composite layer includes an insulating fiber and insulating resin. The pin thread and the box thread are wedge threads. A method of making an electrically-insulative threaded connection includes forming a pin wedge thread on a pin member and winding a filament over the pin wedge thread. The filament is wetted with a resin, thereby forming a composite layer. The composite layer is cured and machined to mate with a box wedge thread.

Abstract: A method for manufacturing a connection for composite tubing is disclosed. The method includes maintaining tension on the composite fibers while “winding in” the connector to the composite tubing. The tension on the fibers results in the fibers bridging across traps of the connector as they are being wound. The bridging results in improved load bearing characteristics of the connection.

Abstract: A threaded connection includes a continuous pin thread including at least a first step, a mid-step, and a second step formed sequentially thereon. A continuous box thread includes at least a first step, a mid-step, and a second step formed sequentially thereon, wherein the steps on the box thread correspond generally in axial position with the steps on the pin thread. The first step has a first wedge ratio, the mid-step has a transition wedge ratio, and the second step has a second wedge ratio, wherein thread leads are substantially constant within each of the steps. The connection is designed such that at make-up of a pin member with a box member, a clearance exists between at least one of corresponding load flanks and corresponding stab flanks on at least one of the first step, the mid-step, and the second step.

Abstract: A fiber reinforced plastic article is disclosed which include a liner, at least one single material fiber layer wound on the liner, and at least one composite fiber layer wound on the single material fiber layer. The at least one single material fiber layer and the at least one hybrid fiber layer are impregnated with resin.

Abstract: Tubulars for transmitting data in a wellbore and threaded connections having electrical contactors embedded therein. The threaded connection includes a first contactor embedded in electrically insulating material within a first slot formed in the pin thread. A second contactor is embedded in electrically insulating material within a second slot formed in the box thread. Upon selected make-up of the pin member with the box member, the first contactor and the second contactor are in contact such that an electrical signal can be transmitted from the box member to the pin member. The first contactor and the second contactor are isolated by at least one sealing arrangement selected from the group consisting of a thread seal, an electrical connector seal, and at least two seals on opposing sides of the first contactor and the second contactor. Methods of manufacturing and making-up a connection are also disclosed.

Abstract: A composite lined tube is disclosed having end couplings. The tube includes a resin impregnated fiber preform pressed progressively along an inner wall of the tube. The tube may further include an inflatable bladder inserted into the tube. The bladder is adapted to inflate along a length thereof on application of increasing pressure to the interior of the bladder. The bladder has disposed on its exterior surface the fiber preform impregnated with resin, which is adapted to fit within the tube. The bladder is then inflated along its length by applying increasing pressure to the bladder. The preform is clamped to a shoulder of one of the couplings at another end of the tube, and the end of the preform is trimmed to conform to the shoulder. Pressure is maintained in the bladder while curing the resin.

Abstract: A system and method for winding fibers onto an article is disclosed. The system includes a winding station having a controllable speed of rotation. The winding station has at least one fiber bobbin mounted on it. A rotation sensor is rotationally coupled to the winding station. The system includes a conveyor having a controllable speed and which is adapted to move the article axially through the winding station. A speed sensor, adapted to measure an axial speed of motion of the article through the winding station is positioned near the winding station. The system includes a controller adapted to operate the winding station at a rotational speed corresponding to the axial speed of motion, so as to apply the fibers to the article in a predetermined helical pattern. In one example, the helical pattern is held to a lay angle having a tolerance within one-half degree.

Abstract: A connector for joining a segment of composite pipe is disclosed. The connector includes an end connector having at least one fiber trap on its outer surface thereof. The end connector is attached to a liner portion of the segment of composite pipe. Fibers forming an outer surface of the segment of composite pipe are wound around the at least one trap under tension. The connector includes a binder which impregnates the fibers. The tension is maintained on the fibers in the trap during cure of the binder.

Abstract: A fiber reinforced plastic article is disclosed which include a liner, at least one single material fiber layer wound on the liner, and at least one composite fiber layer wound on the single material fiber layer. The at least one single material fiber layer and the at least one hybrid fiber layer are impregnated with resin.

Abstract: A method for making a composite lined tube is disclosed, wherein the tube has end couplings on it. The method includes pressing a resin impregnated fiber preform progressively along an inner wall of the tube. In one embodiment, the method includes inserting an inflatable bladder into the tube. The bladder is adapted to inflate along a length thereof on application of increasing pressure to the interior of the bladder. The bladder has disposed on its exterior surface the fiber preform impregnated with resin which is adapted to fit within the tube. One end of the preform is secured to one end of the tube. The bladder is then inflated along its length by applying increasing pressure to the bladder. The preform is clamped to a shoulder of one of the couplings at another end of the tube, and the end of the preform is trimmed to conform to the shoulder. Pressure is maintained in the bladder while curing the resin. In one particular embodiment, the bladder is inflated from its center outwardly to its ends.

Abstract: Resin impregnation of fiber bundles for use in making a composite material is described. The impregnated fiber bundles are suitable for use as a prepreg tape or for inline use in extrusion, pultrusion and filament winding operations. The improvements of the disclosed method and impregnation head enable high fiber take-off speeds without excessive damage or fraying of the fiber bundles. Encapsulated air or voids in the impregnated product are consistently less than 1% by volume of the impregnated product and decrease with increased take-off speed. These improvements are achieved by passing the fiber bundles through a multi-chambered impregnation head in which the resin is injected into a downstream chamber. The cross sectional area of the fiber bundles, the velocity of the fibers bundles, the size of the openings to the chamber, the viscosity of the resin and the pressure at which the resin is pumped into the downstream chamber all control the pressure within the downstream chamber.

Abstract: A method is disclosed for coupling a stub end flanged connector to a fiber reinforced plastic pipe. The method includes tapering an end of the fiber reinforced plastic pipe on the outside surface of its fiber overwrap. An inside surface of a stub end connector is correspondingly tapered. The stub end connector is then bonded to the fiber reinforced plastic pipe. A liner of the plastic pipe is then flared to correspond to a flared end of the stub end connector. Then at least one stiffness transition layer is bonded over the plastic pipe and the stub end connection, over an axial span at least including a termination of the taper in the stub end connector.