Abstract: To be able to insert a cylindrical filter element (10) which is joined at each end to an end disk (14) quickly into a housing element (40) in a filter unit (100) and connect it firmly, a screw connection having conical threads (16, 46) on the filter element (10) and on the bottom of the housing (41) is provided.

Abstract: In percussion rock drilling a screw joint for a drill run or drill string including male and female screw threads (5, 9) on the elements (1, 2) are joined together to form a drill string. Within the screw joint the male thread (5) and the female thread (9) have a trapezoidal shape and a slight conical inclination.

Abstract: A tubular joint, with a first male tubular element, with a male thread, a first annular lip, with a first axial abutting surface, a first internal surface, a section of a first external surface, a second abutting surface and a second female tubular element, with a female thread, matching the male thread, a second annular lip, with a third abutting surface, a second external surface, arranged to face the first internal surface, a second internal surface and a fourth axial abutting surface, supporting the first abutting surface and defining, in particular with the second external surface, an annular housing, matching the first lip. The second and third abutting surfaces being conical with effectively identical inclines and which permit generating a first radial sealing contact of the first internal surface or external surface against the second external surface, or the third internal surface, and, with expansion, provides a second sealing contact.

Abstract: A threaded pipe connection includes a pin member having an external thread increasing in width in one direction, a box member having an internal thread increasing in width in an opposite direction so that complementary internal and external threads move into engagement upon make-up of the connection, and at least one contact zone in which the pin member and box member are in sealed contact.

Abstract: The invention relates to a pipe connection, particularly a gas-tight pipe screw connection, wherein the parts in the connecting region are connected by means of joining according to DIN 8593 by way of contact-pressing and insert-pressing, comprising an inner pipe part (I) and an outer pipe part (A), or two inner pipe parts (I) having an outer collar (A).

Abstract: A threaded pipe coupling is shown for a drill pipe used in horizontal boring operations utilizing a special form of a threaded connection with an internal stiffener ring which eliminates the need for hot forging operations. The pipe coupling is used for joining an upset region of a first tubular member to a further tubular member of lesser external diameter. The internal stiffener ring is received within the internal bore of the pin end of the coupling and underlies and extends along a portion of its length. The stiffener ring having an innermost extent terminating in an exposed end which is received upon an internal shoulder provided in the mating internally threaded box end. The stiffener ring also has an external shoulder formed at the innermost extent thereof which traps the pin face between the ring exterior and the box threaded interior.

Abstract: A threaded connection includes a pin member including a pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, and a box member including a box thread having a box thread crest, a box thread root, a box load flank, and a box stab flank, wherein at least one of the pin thread crest, the pin thread root, the box thread crest, and the box thread root has at least one perturbation formed thereon. Upon a selected make-up of the pin member with the box member, a localized clearance or a localized interference exists between the pin thread and the box thread at the at least one perturbation, wherein the localized clearance between the pin thread and the box thread exists across substantially the entire pin thread crest or substantially the entire box thread crest, and wherein the localized interference between the pin thread and the box thread exists across substantially the entire pin thread crest or substantially the entire box thread crest.

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 tubular connection includes a pin member having external wedge threads configured to engage a box member having corresponding internal wedge threads, and a solid lubricant coating applied on at least one of the internal and external wedge threads wherein the solid lubricant coating comprises a first uniform layer of a dry corrosion inhibiting coating made of an epoxy resin containing particles of zinc and a second uniform layer of a dry lubricant coating covering the first uniform layer.

Abstract: A threaded joint for steel pipes constituted by a pin having male threads and a box having female threads is improved with respect to ease of insertion of the pin and galling resistance of the threaded portions. The stabbing flanks of the threads in a complete thread portion of one of the pin and a box has a two-step stabbing shape having a chamfer. The two-step stabbing shape has a stabbing flank angle ? of 5-45° and a chamfer angle ? of 20-60°. The ratio h/H of the chamfer height h to the thread height H of the pin is 0.25-0.50, or the ratio of the cross-sectional area of the chamfered portion to the overall cross-sectional area of the stabbing flank is made at least a value corresponding to a chamfer height ratio h/H of 0.25 and at most a value corresponding to a chamfer height ratio of 0.50.

Abstract: A tubular configured to mate with a second tubular so that sealing integrity is maintained between the tubulars before, during, and after expansion of the tubulars is disclosed. In one embodiment, a connector for connecting tubulars is provided. The connector includes a pin portion; a box portion, wherein the pin and the box portions are configured to mate; a sealing surface formed in an inner surface of the box portion; a seal disposed in a groove formed in an outer surface of the pin portion, wherein the seal is configured to engage with a sealing surface of the box portion upon mating of the pin and the box portions; and a bump formed on an inner surface of the pin portion, wherein the bump is substantially radially aligned with the groove and the bump is configured so that the seal remains engaged with the box portion during and after expansion of the pin and the box portions.

Abstract: A male element for a sealed threaded tubular connection. Before tapered reduction swaging of an end region of a tube and machining in the region of a tapered male threading and a male lip to obtain a male tubular element for makeup into a female tubular element to form a sealed threaded tubular connection after diametrical expansion, the tube is shaped over a portion of its length to produce a cylindrical internal surface that connects via a chamfer to the cylindrical internal surface of the lip obtained subsequently by machining, the radius of the first surface being greater than the radius of the second surface.

Abstract: A thread form is shown which is used to make a threaded pipe connection capable of being screwed together and subsequently unscrewed. A pin member has external threads with stab flanks and load flanks and flat crests and roots for mating with the mating internal threads of a box member to make up a pipe connection. The stab flanks and load flanks form a distinct geometric profile which is arrow-shaped when viewed in profile. The arrow profile can be cut in either of two opposite directions. Each profile includes only two facets with the facets on the stab flank and the facets on the load flank both leaning in the same direction with respect to the longitudinal axis of the pipe, when viewed in profile.

Abstract: A wedge-threaded tubular connection includes a pin member and a box member, wherein each of the pin and box members include an engaged thread area, and a clearance gap volume formed between corresponding roots and crests of the pin and box members and arranged along an axial length of the engaged thread area according to a distribution profile. The clearance gap volume distribution profile is configured having a greater clearance gap volume proximate a central portion of the engaged thread area and progressively less clearance gap volume towards each of the distal ends of the engaged thread area.

Abstract: A method to improve fatigue resistance of a threaded tubular connection. Radial interference between a male and female threading operates between stabbing flanks inclined at about 27° with respect to an axis of the threadings, wherein mutual contacting surfaces are radially spaced from a root of the male threading, which is defined by a concave rounded portion.

Abstract: A threaded connection includes a pin member having a pin thread having a pin load flank and a pin stab flank. The threaded connection includes a box member having a box thread having a box load flank and a box stab flank. The pin thread includes a first wedge segment on the pin stab flank and the box thread includes a second wedge segment on the box stab flank. Upon make-up of the pin member with the box member, a contact stress results from engagement of the first wedge segment with the second wedge segment.

Abstract: A tubular threaded joint which has excellent resistance to compression and which permits easy tightening operation in the field in a vertical state comprises a pin having a male threaded zone and a box having a female threaded zone. The pin or the box has an end shoulder surface on its end, and the other member has a shoulder surface which abuts against the end shoulder surface. The screw threads of the male threaded zone and the female threaded zone are trapezoidal threads having a crest, a load flank, and a stabbing flank. The lip length, which is the distance in the axial direction of a member having an end shoulder surface between the end shoulder surface and the closest engaged thread to that surface, is at least 140 times the stabbing flank clearance, which is the distance in the axial direction between the stabbing flanks of the male thread and the female thread when the load flanks of the male and female threads contact each other. The stabbing flank of the male thread is preferably chamfered.

Abstract: A threaded connection includes a pin member having a pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, a box member having a box thread having a box thread crest, a box thread root, a box load flank, and a box stab flank, wherein at least one of the pin thread crest, the pin thread root, the box thread crest, and the box thread root has at least one perturbation formed thereon, and wherein upon a selected make-up of the pin member with the box member, at least one of a localized clearance or a localized interference exists between the pin thread and the box thread at the at least one perturbation.

Abstract: A threaded oilfield tubular connection 10 includes a pin member 12 having a first external tapered thread 24 and a second external tapered thread 26. A box member includes a first internal tapered thread 14 and a second internal tapered thread 16. Helical torque shoulders 40, 42 are provided on the pin member and the box member, and an axially spaced between the respective first and second threads. The helix of each torque shoulder includes a plurality of revolutions with compression flanks on both the pin member and the box member.

Abstract: A threaded joint for steel pipes comprises a pin (1) and a box (2) each having a threaded portion (3a or 3b) and an unthreaded metal-to-metal contact portion (4a or 4b) as contact surfaces which contact each other when the joint is fastened. The contact surfaces (3a and 4a and/or 3b and 4b) of at least one of the pin (1) and the box (2) are coated with a lower layer of a solid lubricating coating containing a solid lubricating powder (e.g., molybdenum disulfide, tungsten disulfide, or graphite) and a binder (e.g., an epoxy or other organic resin) and an upper layer of a solid corrosion protective coating formed by an organic resin which does not contain solid particles.

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 stabbin flank (14) angle, (?2, or b), wherein the threads are coated with a solid, dopefree surface treatment.

Abstract: A threaded pipe connection includes a pin member having an external thread increasing in width in one direction, a box member having an internal thread increasing in width in an opposite direction so that complementary internal and external threads move into engagement upon make-up of the connection, and at least one contact zone in which the pin member and box member are in sealed contact.

Abstract: A threaded joint comprises a seal ring positioned between a pin and a box, and located in a groove between the end of a threaded section and the nose of the box. The seal ring has a first base, a second base axially opposite to the first base, at least two protruding annular ribs on the external surface, and an internal surface comprising, in an unloaded position, two frustoconical annular surfaces tapering towards the center of the seal ring and joined by a fillet.

Abstract: A threaded tubular joint comprising male and female members is provided. The ends of the male members comprise an upper portion and a lower portion located between an upper threaded portion and an inner surface of each of the male ends. The upper portion is formed by a thread bevel which transitions into a first rounded area and the lower portion is formed by a second rounded area. A reversibly deformable ring may be housed within a central section of the joint. When the male members are substantially engaged within the joint, the ring is compressed by the ends of the male members.

Abstract: A threaded element of a component includes at least first and second threading portions each including threads each including a stabbing flank and a loading flank. The stabbing flanks and loading flanks of the threads of the first threading portion and the threads of the second threading portion are inclined in an opposed manner with respect to the radial direction.

Abstract: A threaded connection includes a pin member including a pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, and a box member including a box thread having a box thread crest, a box thread root, a box load flank, and a box stab flank, wherein at least one of the pin thread crest, the pin thread root, the box thread crest, and the box thread root has at least one perturbation formed thereon. Upon a selected make-up of the pin member with the box member, a localized clearance or a localized interference exists between the pin thread and the box thread at the at least one perturbation, wherein the localized clearance between the pin thread and the box thread exists across substantially the entire pin thread crest or substantially the entire box thread crest, and wherein the localized interference between the pin thread and the box thread exists across substantially the entire pin thread crest or substantially the entire box thread crest.

Abstract: A threaded joint for steel pipes comprised of a pin (1) and a box (2) each having a threaded portion (1a, 2b) and an unthreaded contact portion (1b, 2a) exhibits adequate leakage resistance and galling resistance when used for makeup of oil country tubular goods with application of a green dope or even without any dope. The threaded joint has a first plating layer of Sn—Bi—Cu alloy plating formed on the contact surface of at least one of the pin (1) or the box (2). The first plating layer may have a second plating layer selected from Sn plating, Cu plating, and Ni plating on its lower side and at least one layer of a lubricating coating, and particularly a solid lubricating coating on its upper side.

Abstract: A sucker rod connection is disclosed. The sucker rod connection comprises a tapered male member including a plurality of trapezoidal threads, and, a tapered female member also including a plurality of trapezoidal threads, in which the male member is capable of being received in threaded engagement with the female member, wherein the threads of the male member are in flank-to-flank contact, both flanks on each thread, with the threads of the female member, thereby creating diametrical interference between the male and female members preventing disengagement and substantially reducing axial interference between the male and female members.

Abstract: A thread form is shown which is used to make a threaded connection between two tubular members and which is capable of being screwed together and subsequently unscrewed. A pin member is provided having external threads with stab flanks and load flanks and flat crests and roots for mating with the mating internal threads of a box member to make up a pipe connection. The thread crests on the pin member are cylindrical with respect to a central longitudinal axis of the tubular member while the thread roots are cut on a taper so that the height of the threads vary over the length of the thread form. The threads on the pin and box members can also be cut oppositely so that respective members of the thread forms are mirror images of each other.

Abstract: A threaded connection between adjacent tubular members includes a pin member providing an external wedge thread and a box member providing an internal wedge thread, wherein the internal wedge thread corresponds with the external wedge thread. Further, the threaded connection includes at least one interruption along a helical thread length of one of the external wedge thread and the internal wedge thread and at least two regions along an axial length of the threaded connection where the external wedge thread and the internal wedge thread form a thread seal.

Abstract: A threaded tubular connection that is leak-proof for internal and external successive pressure loads including a male element and a female element. At least one of the male or female elements includes a lip between the threading and the free end of the element. The lip includes a first zone with a peripheral surface turned towards the other element on which a first metallic sealing surface is disposed that can be radially interference fitted against a corresponding second metallic sealing surface disposed on the other element. The lip includes a second zone located axially between the first zone and the corresponding threading. The radial stiffness of the second zone is less than that of the first zone and that of a third zone adjacent to the second zone in the direction of the threading, and the second zone can be radially deformed by a pressure exerted thereon.

Abstract: A thread form is shown which is used to make a threaded pipe connection capable of being screwed together and subsequently unscrewed. A pin member is provided having external threads with stab flanks and load flanks and flat crests and roots for mating with the mating internal threads of a box member to make up a pipe connection. One of the stab or load flanks is made up of two facets and three radii. The other selected flank is made up of three facets and four radii, giving it irregular features forming a complex geometric profiles. The thread form can be used to form a premium threaded connection which is used with such tubulars as casing and tubing for oil, gas, water and waste disposal wells.

Abstract: A threaded pipe connection including a pin member having an external thread increasing in width in one direction, the external thread including load and stab flanks, a box member having an internal thread increasing in width in the other direction so that complementary internal and external threads move into engagement upon make-up of the connection, the internal thread comprising load and stab flanks, a positive stop torque shoulder, and wherein the width of the internal thread and external thread are selected to provide a selected clearance at least between the internal load and stab flanks and the external load and stab flanks upon initial engagement of the positive stop torque shoulder is disclosed.

Abstract: A threaded joint for steel pipes constituted by a pin having male threads and a box having female threads is improved with respect to ease of insertion of the pin and galling resistance of the threaded portions. The stabbing flanks of the threads in a complete thread portion of one of the pin and a box has a two-step stabbing shape having a chamfer. The two-step stabbing shape has a stabbing flank angle ? of 5-45° and a chamfer angle ? of 20-60°. The ratio h/H of the chamfer height h to the thread height H of the pin is 0.25-0.50, or the ratio of the cross-sectional area of the chamfered portion to the overall cross-sectional area of the stabbing flank is made at least a value corresponding to a chamfer height ratio h/H of 0.25 and at most a value corresponding to a chamfer height ratio of 0.50.

Abstract: Threaded connections including a pin member and a box member and are mismatched. The pin member and the box member have wedge threads formed thereon with a gap formed between pin and box load flanks and/or pin and box stab flanks of the threaded connection. The mismatch may comprise different flank angles and/or different flank profiles between corresponding flanks.

Abstract: A threaded joint for an oil well pipe in which a conventional threaded joint for an oil well pipe is improved so that sufficient fatigue fracture strength is secured, and a method for manufacturing the same are provided. An axial-direction residual stress of a threaded bottom part is set to ?400 MPa or less as a value of X-ray stress analysis between a surface and a part with a depth of 40 ?m.

Abstract: A threaded connection includes at least one contact zone axially separated from threadings in which male and female elements are in sealed contact via bearing surfaces respectively constituted by a cambered surface and by a tapered surface.

Abstract: An external pipe joint between a pin section (30) and a box section (40) is disclosed. The end of the pin and box sections have complementary screw-threaded portions, adapted to interengage along the greater part of the axial length thereof, the threads being inclined in the same direction and at an acute angle to the longitudinal axis of the joint. The box section extends at least to a stop shoulder (44) having a frusto-conical head portion which is positioned adjacent a complementary stop shoulder recess (36) on the pin section. In order to sealingly receive the frusto-conical head portion, the complementary stop shoulder recess (36) comprises a cone receiver having a conical cross-section. An annular groove (45) intermediate the threaded portion and the stop shoulder of the box section is included.

Abstract: A riser connector uses a box and upset pin connector threadform design having S-shaped load flanks that provide a variable load angles depending on the radial position along the engaged teeth. This design promotes a load path that changes with position along the axial length of the engaged thread, as well as increasing or decreasing external loads on the connector. The connector also varies radial distention of the pin from the box in a manner that is different from one thread to the next. The threadform uses a combination of thread cuts that vary in shape, pitch, and/or thread cone angle to provide load and stab flanks, as well as a load path, that vary from one axial end of the engaged thread to the other.

Abstract: A thread form is shown which is used to make a threaded pipe connection capable of being screwed together and subsequently unscrewed. A pin is provided having external threads with stab flanks and load flanks and flat crests and roots for mating with the mating internal threads of a box to make up a pipe connection. The stab flanks and load flanks form complex geometric profiles which in one version form an inclined Z-shape in profile and in another version form a reverse inclined Z-shape profile. Each profile includes at least three separate facets with the facets on the stab flank and the facets on the load flank both leaning in the same direction with respect to the longitudinal axis of the pipe, when viewed in profile.

Abstract: An expandable tubular pin and box connection is described having a feature of trapping the pin nose after preferably deforming the pin nose plastically in an outward direction away from the longitudinal axis of the connection. The box end is held away from the pin wall before expansion so that its tendency to curl inwardly upon expansion causes it to bend against the pin wall for sealing with it. The thread profile is also optimized to reduce flank separation as a result of expansion.

Abstract: The invention relates to a high-performance threaded tubular joint comprising a first, male tubular element (11) and a second, female tubular element (12) made up together by screwing. One of the tubular elements (11; 12) has a non-threaded lip (38; 5) extending between its thread and its free end and having a sealing surface (40; 7) in sealing-tight contact with the opposite surface (41; 8) of the other element after screwing together, diametric expansion, and then generation of springback forces of the first and second tubular elements. The joint has a tubular sleeve (34; 36) threaded over the second element (12) before screwing together and positioned to extend axially substantially opposite to the lip (3; 5) and, after diametric expansion, generating a springback force which is added to that of the second element in order to counteract the springback force of the first element, thus effecting at least the shrink-fitting of the tubular sleeve over the second element.

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: A tubular threaded joint which has excellent resistance to compression and which permits easy tightening operation in the field in a vertical state comprises a pin having a male threaded zone and a box having a female threaded zone. The pin or the box has an end shoulder surface on its end, and the other member has a shoulder surface which abuts against the end shoulder surface. The screw threads of the male threaded zone and the female threaded zone are trapezoidal threads having a crest, a load flank, and a stabbing flank. The lip length, which is the distance in the axial direction of a member having an end shoulder surface between the end shoulder surface and the closest engaged thread to that surface, is at least 140 times the stabbing flank clearance, which is the distance in the axial direction between the stabbing flanks of the male thread and the female thread when the load flanks of the male and female threads contact each other. The stabbing flank of the male thread is preferably chamfered.

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 tubing connection arrangement and a method used for coupling expandable tubing sections together. In one embodiment, there is disclosed a tubing connection arrangement comprising a first expandable tubing section defining a male portion; a second expandable tubing section defining a female portion, the first and second expandable tubing sections being engageable with one another; one of the first and second expandable tubing sections including a restraining member for restraining part of the other expandable tubing section; and the first expandable tubing section including a tapered shoulder for co-operating with a corresponding tapered shoulder of the second expandable tubing section.

Abstract: A fatigue-resistant threaded element for a threaded tubular connection. A portion of threads of the threaded element have a helical groove opening into the threaded crest. A groove is formed in all or a portion of the threads of one or both end zones, namely the first engaged thread zone and the last engaged thread zone, and it is optionally formed in the threads of the medial thread zone. The groove reduces stiffness of threads carrying a groove in the end zone or zones compared with the stiffness of the threads in the medial thread zone. The threaded tubular connection obtained after making up the threaded element with a mating threaded element is much more resistant to cyclic tensile stress and/or axial compressive stresses and/or flexion stresses.

Abstract: An interconnection for oil field tubular goods operates in a self sealing manner in response to internal pressures which might otherwise cause leakage through couplings or joints. Each coupling sleeve includes an interior fulcrum ring fitted between the nose ends of the tubing or casing, and centrally engaging a fulcrum seating zone centered in the sleeve. Internal pressures tend to bend the ends of the fulcrum ring outwardly toward clearance or relief spans on each side of the fulcrum zone. This deflection increases the contact force and enhances the metal-to-metal seal between the end faces of the fulcrum ring and the pin end faces.

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 threaded oilfield tubular connection 10 includes a pin member 12 having a first external tapered thread 24 and a second external tapered thread 26. A box member includes a first internal tapered thread 14 and a second internal tapered thread 16. Helical torque shoulders 40, 42 are provided on the pin member and the box member, and an axially spaced between the respective first and second threads. The helix of each torque shoulder includes a plurality of revolutions with compression flanks on both the pin member and the box member.