Abstract: A measurement method for thread parameters for a threaded object (3), by means of a measurement device (1) defining a spatial reference system (X, Y, Z) incorporating an optical sensor (5) to retrieve the shape of the threaded object, and defining a spatial reference system (X?, Y?, Z?), the measurement device (1) having a computer to assemble a first matrix that describes the quadratic form representing the threaded object in the spatial reference system (X, Y, Z), thus providing the relationship between the two spatial reference systems.

Abstract: A threaded connection design having a double ellipse in the thread root for reducing stress fatigue is illustrated in this disclosure. The root groove includes a first portion comprising a first elliptical surface being part of a first ellipse. The root groove further includes a second portion comprising a second elliptical surface, being part of a second ellipse, and the second elliptical surface being joined tangentially at a first end to the first elliptical surface at a junction point that defines the bottom of the root groove. The second elliptical surface is joined tangentially at a second end to the load flank.

Abstract: Embodiments of the present disclosure provide systems and methods for assembly of tubular joints which overcome the drawbacks and limitations of conventional joints. In certain embodiments, the tubular joints may comprise threaded joints used in oil exploration. Joints may be assembled using a combination of a) position control, b) specific production tolerances for thread parameters, and c) coatings applied on threaded areas of the joint. In further embodiments, the tubular joints may have no torque shoulder and/or metal to metal seals. In additional embodiments, the joints may be further assembled and disassembled several times without application of dope or grease and exhibit enhanced sealability. Beneficially, embodiments of the present disclosure may provide high tolerance, precisely assembled joints that provide improved performance (e.g.

Abstract: Embodiments of the present disclosure are directed to methods of manufacturing steel tubes that can be used for mining exploration, and rods made by the same. Embodiments of the methods include a quenching of steel tubes from an austenitic temperature prior to a cold drawing, thereby increasing mechanical properties within the steel tube, such as yield strength, impact toughness, hardness, and abrasion resistance. Embodiments of the methods reduce the manufacturing step of quenching and tempering ends of a steel tube to compensate for wall thinning during threading operations. Embodiments of the methods also tighten dimensional tolerances and reduce residual stresses within steel tubes.

Abstract: A make-up method for a threaded joint with a pin and a box to increase the fatigue life of the joint is provided. The method includes the step of applying a torque for making up the pin in the box until first and second abutment shoulders of the pin and the box abut. The method can also include the step of applying an additional torque to the threaded joint until a magnitude of between 50% and 90% of the yield strength of the joint material in the most stressed part of the joint is reached.

Abstract: A threaded joint for pipes includes a pin member and a box member, the pin member having an external thread configured to correspond to an internal thread of the box member, a thread form of the internal and external threads having generally dovetail-shaped profile with stab flanks and load flanks and flat roots and crests, wherein the internal threads are increasing in width in one direction on the box and the external threads are increasing in width in the other direction on the pin, so the roots, crests, and flanks of the threads move together and form seals that resist the flow of fluids between the seals.

Abstract: A threaded joint for pipes includes a pin member and a box member, the pin member having an external thread configured to correspond to an internal thread of the box member, a thread form of the internal and external threads having generally dovetail-shaped profile with stab flanks and load flanks and flat roots and crests, wherein the internal threads are increasing in width in one direction on the box and the external threads are increasing in width in the other direction on the pin, so the roots, crests, and flanks of the threads move together and form seals that resist the flow of fluids between the seals.

Abstract: A coating which provides corrosion resistance, wear resistance, and, optionally, lubrication, for deposition on a threaded article is disclosed. The coating comprises a polymer matrix, such as a polyimide, which is modified with small amounts of a fluorine containing polymer modifier, as well as other compounds or additives to improve performance of the coating. Additionally, the coating can further comprise a solid lubricant or an anticorrosion compound dispersed within the polymer matrix.

Abstract: A threaded joint comprises a pin coupled to a box with an annular groove, one or a pair of seal rings, and hydraulic actuating means to pressurize the seal ring or rings against the pin to provide sealability of the joint. The seal ring or rings comprise a frustoconical surface, an external surface, and an internal surface with one or more protruding annular ribs. In the unpressurized state, the seal ring or rings do not protrude from the groove. In the pressurized state, the frustoconical surface of the sealing ring is in sealing contact with an internal surface of the annular groove of the box, and the annular ribs of the sealing ring are in sealing contact with the external surface of the pin.

Abstract: Embodiments of the present application are directed towards steel compositions that provide improved properties under corrosive environments. Embodiments also relate to protection on the surface of the steel, reducing the permeation of hydrogen. Good process control, in terms of heat treatment working window and resistance to surface oxidation at rolling temperature, are further provided.

Abstract: A high strength bainitic steel and a process for producing seamless pipes for OCTG applications are described. In particular, the advantages ensuing to the steel of the invention are the improvement in strength-toughness over tempered martensitic steels, and a simplified thermal treatment. Quenching is not necessary and by avoiding the quenching treatment the microstructure results far more homogeneous, which allows thick walled tubes to be produced. For the same steel composition, in comparison to conventional tempered martensitic structures, a better combination of strength and toughness can be achieved, in particular by tempering as rolled carbide-free bainitic structures.

Abstract: Coating systems which provide corrosion resistance and, optionally, lubrication, for threaded connections are disclosed. The compositions comprise a first coating composition comprising polymer matrices of polyimides or epoxies which are modified with small amounts of a fluorine containing polymer. Also present in the coating compositions are corrosion inhibiting agents and inorganic particles having a mean diameter of between approximately 10 nm and 10 ?m. Solid lubricants, which may include at least one of PTFE, HDPE, Graphite, and MoS2, are optionally added to provide the first coating with a low coefficient of friction. The coating systems may further comprise a second coating composition, comprising a solid lubricant dispersed within an epoxy resin and a solvent. The first and second coating compositions are deposited on at least a portion of at least one of the pin and box members of the threaded connections.

Abstract: A threaded joint includes a first seal ring having a tapered shape in a cross section on an axial plane, this ring having an L-shaped metal reinforcement ring embedded in it. The threaded joint can also include a second seal ring positioned more internal to the first seal ring and located in a housing between the end of a threaded section and the nose of the box. The second seal ring has a first base, a second base axially opposite to the first base, and protruding annular ribs either on the external surface or on an internal surface.

Abstract: A method for the electrochemical plating or marking of metals includes providing a metal surface, providing an electroplating solution at the metal surface, and electroplating the metal surface with the electroplating solution. A top layer of the metal surface comprises an oxide scale. The method can also include masking a portion of the metal surface with a masking material. The electroplating solution can be provided at the metal surface by an electroplating brush, the oxide scale of the metal surface can be comprised primarily of magnetite and hematite, and the material comprising the metal surface can be steel.

Abstract: In one embodiment, a functionalized particle includes a n inorganic particle with diazonium functional group attached. In some embodiments, the largest dimension of the inorganic particle ranges between about 10 nm and 1000 ?m. In another embodiment, a substrate with a hydrophobic surface includes a substrate, and a first plurality of inorganic particles with at least one diazonium functional group attached to the substrate. The largest dimension of the first plurality of inorganic particles ranges between about 10 nm and 1000 ?m. One embodiment includes a second plurality of particles with at least one phenol functional group attached to the inorganic particle. In a further embodiment, a fluorinated functional group is attached to the second plurality of particles. In some embodiments, the material has a hydrophobic surface with a water contact angle greater than about 150°.

Abstract: A threaded connection includes a first pipe having an internal liner and a first pin end on a distal end thereof, the first pin end comprising a first annular seal permanently affixed therein, a second pipe having an internal liner and a second pin end on a distal end thereof, the second pin end comprising a second annular seal permanently affixed therein, a coupling having a first and second box end. The first pin end and the first box end, and the second pin end and the second box end are threadedly are threadedly engaged and a mating surface of the first annular seal is configured to contact a mating surface of the second annular seal and provide a continuous internal seal along an axial length of the threaded connection.

Abstract: A high torque threaded joint comprising a box member having threads and a pin member having threads (10) configured and positioned to mate with the threads of the box member. There is a flank-to-flank contact thread profile using trapezoidal threads with both a positive and very low load flank angle, (?1 or a); and a positive and very low stabbing flank (14) angle, (?2, or b), wherein the threads are coated with a solid, dopefree surface treatment.

Abstract: A threaded joint comprises a coupling, a first pin, and a second pin, wherein the thread of the first pin has a pitch different from the pitch of the thread of the second pin. The extremities of the pins have slanted contact surfaces of complementary shape that make mutual contact after make-up of the joint. The slanted common plane of contact of both pins has an angle to the plane perpendicular to the longitudinal axis of the joint which is greater than 0°. In an alternative embodiment the contact surfaces of the pins are split into two staggered planes and comprise a seal in-between.

Abstract: Embodiments of the present disclosure provide systems and methods for assembly of tubular joints which overcome the drawbacks and limitations of conventional joints. In certain embodiments, the tubular joints may comprise threaded joints used in oil exploration. Joints may be assembled using a combination of a) position control, b) specific production tolerances for thread parameters, and c) coatings applied on threaded areas of the joint. In further embodiments, the tubular joints may have no torque shoulder and/or metal to metal seals. In additional embodiments, the joints may be further assembled and disassembled several times without application of dope or grease and exhibit enhanced sealability. Beneficially, embodiments of the present disclosure may provide high tolerance, precisely assembled joints that provide improved performance (e.g.

Abstract: Thread parameters for a threaded object are determined. Spatial reference systems (X, Y, Z) and (X?, Y?, Z?) are respectively identified for a position sensor and the threaded object. A transformation matrix describing a quadratic form representing the threaded object in (X, Y, Z) may be determined to relate the reference systems. For example, a sensor trajectory on the threaded object may be determined, along with measurement points on the threaded object. The measurement points may be selected so the matrix, evaluated on these values, has maximum rank. Position data at measurement points in the second reference system may be transformed into the first reference system, yielding first results. After coating the threaded object, position data at the measurement points may be acquired again and transformed into the first reference system, yielding second results. Comparisons between the first and second results may provide thickness of the coating and quality verification.