Nippon Steel Corporation

Sumitomo Metal Industries, Inc.

Vallourec & Mannesmann Oil & Gas France

Vallourec Oil and Gas France

Nippon Steel Sumitomo Metal Corporation

Vallourec Oil & Gas

Michihiko Iwamoto

Masaaki Sugino

Eric Verger

Satoshi Maruta

Miyuki Yamamoto

Masaru Takahashi

Kunio Goto

Keiichi Nakamura

Shigeo Nagasaku

Keishi Matsumoto

Ryuichi Imai

Bertrand Maillon

Suguru Yamaguchi

Takayuki Kamimura

Claire Patureau

Daly Daly

Yusuke Takeda

Gabriel Roussie

Sylvain Beigneux

Yusuke Toyota

Yasuhiro Kochi

Pierre Dutilleul

Takahiro Hamamoto

Katsutoshi Sumitani

Stéphanie Raï

Jean-Francois Charvet-Quemin

Gabriel Briquet

Benoit Le Chevalier

Alain Lancry

Jean-François Charvet-Quemin

Benoît Le Chevalier

A threaded connection for steel pipe is provided that can be made up quickly and appropriately. The threaded connection includes a steel pipe, a steel pipe, and a couplingfor connecting the steel pipesand. The pipe bodiesandof the steel pipesandinclude annular marking groovesand, respectively, formed on the outer peripheries of the pipe bodiesand

Threaded connection for steel pipe

A threaded connection connecting a pair of pipes includes a pin and a box. The pin has a male thread on its outer diameter. The box has a female thread on its inner diameter, the female thread corresponding to the male thread. The male thread includes constant-thread-width and varying-thread-width portions. The constant-thread-width portion has a constant thread-groove width. The varying-thread-width portion has a thread-groove width equal to or larger than the groove width of the constant-thread-width portion and gradually increasing, from the constant-thread-width portion toward the tip of the pin. The female thread includes constant-thread-width and varying-thread-width portions. The constant-thread-width portion has a constant thread-ridge width. The varying-thread-width portion has a thread-ridge width equal to or larger than the thread-ridge width of the constant-thread-width portion and gradually increasing from the constant-thread-width portion toward the center of the box.

Threaded connection

A threaded connection includes a pin including a wedge male thread having a varying-thread-width portion and a box including a wedge female thread having a varying-thread-width portion. The threaded connection is constructed such that, when both stab flanks and load flanks of the male thread of the pin contact the box, the shoulder on the pin is not in contact with the shoulder on the pin, and, with a further rotation in the make-up direction, the shoulder on the pin is capable of contacting the shoulder on the pin before the threads (i.e. male and female threads) yield.

A threaded connection for steel pipe is provided that prevents cross-threading and provides good compression load resistance. A threaded connection () includes a pin () and a box (). The male thread stabbing flank () of the pin () includes two male thread stabbing flank portions () and (). The male thread stabbing flank portion () is located farther from the pipe axis (X) of the steel pipe () and has a stabbing flank angle (&#x3b1;1) of &#x2212;10 to 15 degrees. The male thread stabbing flank portion () is located closer to the pipe axis (X) and has a stabbing flank angle (&#x3b1;2) of 20 to 60 degrees. The female thread stabbing flank () of the box () includes two female thread stabbing flank portions () and (). The female thread stabbing flank portion () is located farther from the pipe axis (X) and has a stabbing flank angle (&#x3b1;1) equal to the stabbing flank angle (&#x3b1;1) of the male thread stabbing flank portion (). The female thread stabbing flank portion () is located closer to the pipe axis (X) and has a stabbing flank angle (&#x3b1;2) equal to the stabbing flank angle (&#x3b1;2) of the male thread stabbing flank portion ().

In a threaded joint for pipes constituted by a pin and a box, each having a contact surface comprising a threaded portion and an unthreaded metal contact portion, the contact surface of the pin has a solid corrosion protective, preferably transparent coating based on a UV-curable resin and the contact surface of the box has a solid lubricating coating having plastic or viscoplastic rheological behavior which is preferably formed by the hot melt technique from a composition comprising a thermoplastic polymer, a wax, a metal soap, a corrosion inhibitor, a water-insoluble liquid resin, and a solid lubricant.

Threaded joint for pipes

A threaded tubular connection includes a female threaded portion at a first tubular component end and a male threaded portion at a second tubular component end, the female threaded portion including a female thread, at least one female sealing surface on its inner peripheral surface, and at least one female axial abutment surface, the male threaded portion including a male thread, at least one male sealing surface on its outer peripheral surface, at least one axial abutment surface, and a lip disposed between the sealing surface and an axial abutment surface located at a free end of the threaded portion distant from the thread, the male thread being made up into the female thread such that at least one male axial abutment surface is in contact with at least one female axial abutment surface, at least one male sealing surface being in interference contact with at least one corresponding female sealing surface, the portion of the lip between the sealing surface and the axial abutment surface being radially distant from a corresponding surface of the other threaded portion, at least one leak channel being provided in one of the threaded portions to place the chamber formed between the lip and the corresponding surface of the other threaded portion in communication with the interior of the connection.

Threaded connection comprising at least one threaded element with an end lip for a metal tube

A threaded joint for steel pipes comprising a pin () and a box (). The pin has a male thread () and a lip () which comprises (i) a sealing surface () and (ii) a nose portion () provided with a shoulder surface. The box has a female thread (), a sealing surface () and a shoulder surface. The shoulder surface of the pin comprises two distinct adjacent surfaces, main shoulder () in the inner side and sub shoulder () in the outer side. Correspondingly, the shoulder surface of the box comprises two distinct adjacent surfaces, main shoulder () in the inner side and sub shoulder () in the outer side. The main shoulder surfaces of the pin and box are disposed such as to prevent a radially inward deformation of the lip end, and the sub shoulder surfaces of pin and box are disposed such as to limit a radially outward deformation of the lip end. The main shoulder of the pin has a greater radial dimension than said sub shoulder of the pin, and at least the main shoulder surface of the pin is in axial abutment with at least the corresponding main shoulder surface of the box.

Threaded joint for steel pipes

A threaded joint for steel pipes comprises a pin () and a box (). The pin has male thread (), a sealing surface (), and a shoulder surface () located on the end face of the pin. Correspondingly, the box has female thread (), a sealing surface (), and a shoulder surface () which can mate or contact with the corresponding portions of the pin. The shoulder surface () of the pin () is provided at an end face of the pin. The sealing surface () of the pin () is located on a pipe end side near the male thread (). A a nose portion () is provided on the pin () between the sealing surface () and the shoulder surface (), the nose portion () being not in contact with a corresponding portion of the box ().

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.

Tubular threaded joint

In a threaded joint for steel pipes which are connected by threaded engagement of a pin member having a tapered male thread, a metal seal-forming portion, and a torque shoulder-forming portion on the end of a pipe, and a box member having a tapered female thread, a metal seal-forming portion, and a torque shoulder forming-portion corresponding to these on the end of a pipe, a buttress thread having contact at the load flanks and the thread root surface and gaps at the thread crest surface and the stabbing flanks is mixed in a single joint with a rugged thread having contact at the load flanks and stabbing flanks and having gaps at the thread root surface and thread crest surface.

Apparatus and method of measuring outer diameter of worked portion at pipe end

A joint of the integral type includes a male element 1 and a female element 2 with a diameter close to that of the tubes. Each of the elements has two shifted frustoconical threaded sections 4, 5, 6, 7 with vanishing threads at the two ends, by virtue of convergences of frustoconical envelope surfaces 16, 17, 18, and 19 and cylindrical surfaces 20, 21, 22, 23. A central abutment 24 cooperates with the negative-flank threads to reinforce the male/female connection and two internal 27 and external 28 ring-shaped metal/metal tightness zones, preventing the penetration of fluid into the threaded zones from the ends. The threaded joint may be used with tubes for very deep wells for which the reduction of the diameter of the assemblies makes it possible to lower costs, and other tubes for which a problem of the same type may arise.

Threaded joint for tubes

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Wakayama, Japan

Michihiko Iwamoto