Abstract: Threaded tubular connection for the casing of hydrocarbon wells obtained by makeup of a male tool joint with a female tool joint, the connection includes in order from a free edge of the male tool joint: an inner metal-metal seal, a first threaded portion, an intermediate abutment, an intermediate metal-metal seal and a second threaded portion, the free edge being at a non-zero axial distance from the female tool joint, the threaded portions each comprising a helix equipped with a load flank, a thread crest, a stabbing flank, a thread root, such that a pitch of the load flank and a pitch of the stabbing flank of the first threaded portion, and respectively a pitch of the load flank and a pitch of the stabbing flank of the second threaded portion fulfil the following condition: SFLb1=LFLb1=SFLb2=LFLb2=SFLp1=SLFLp2=LFLp2.

Abstract: Threaded tubular connection for the casing of hydrocarbon wells obtained by makeup of a male tool joint with a female tool joint, the connection comprising a threaded portion (16a, 18a), such that the male and respectively female threaded portions each comprise a helix provided with a load flank, a thread crest, a stabbing flank, a thread root, such that a pitch of the load flank (LFLp, LFLb) and a pitch of the stabbing flank (SFLp, SFLb) fulfils the following condition: [Math 22] SFLb=LFLb=SFLp=LFLp=k, A tooth width (Wtp) of the male helix and a tooth width of the female helix (Wtb) are such that [Math 23] or [Math 24] and [Math 25] Wtp+Wtb<k

Abstract: The threaded joint includes a pin and a box. The pin includes a taper male thread part, and the box includes a taper female thread part to be engaged with the taper male thread part. The male thread part is divided into a first region on the free end side of the pin, and a second region on the tubular side of the pin along a tube axis direction. The taper ratio of the first region is greater than the taper ratio of the second region. The taper ratio of the first region is greater than the taper ratio of the female thread part. The taper ratio of the second region is equal to or greater than the taper ratio of the female thread part.

Abstract: This invention provides a threaded connection for oil country tubular goods that exhibits excellent corrosion resistance and galling resistance, and a method for producing the threaded connection for oil country tubular goods. The method includes a Zn—Ni alloy plating layer formation step of forming a Zn—Ni alloy plating layer, and a chromate coating formation step of forming a chromate coating after the Zn—Ni alloy plating layer formation step. The chromate coating formation step includes a chromate treatment step and a drying step. The chromate coating formation step satisfy one or more conditions selected from the following conditions 1 to 3. Condition 1: stirring speed of the chromating solution in the chromate treatment step: a linear speed of 0.5 m/s or more; Condition 2: chromate treatment time in the chromate treatment step: less than 50 seconds; and Condition 3: drying temperature in the drying step: 60° C. or less.

Abstract: A tubular threaded joint for the drilling, the exploitation of hydrocarbon wells or the transport of oil and gas includes a male tubular element and a female tubular element. The female tubular element includes a female inner threaded portion and a female non-threaded portion. The male tubular element includes a male outer threaded portion and a male non-threaded portion. The male or female tubular element includes a body and an added portion by additive manufacturing that includes at least one first abutment surface.

Abstract: A threaded joint for pipes disclosed herein includes a pin and a box. The pin and the box each include a contact surface including a threaded portion and a metal contact portion. The threaded joint for pipes includes a solid lubricant coating on at least one of the contact surfaces of the pin and the box, the solid lubricant coating including a binder, a lubricant additive, an anti-rust additive, and a plasticizer.

Abstract: A threaded connection for steel pipe that provides both high torque performance and high tension performance is provided. A threaded connection 1 includes a tubular pin 10 formed by one tip portion of a steel pipe and a tubular box 20 adapted to be made up on the pin 10 as the pin 10 is inserted into the box. The pin 10 includes a male thread 11 provided on an outer periphery of the pin 10, the male thread being a wedge thread. The box 20 includes a female thread 21 corresponding to the male thread 11 and provided on the inner periphery of the box 20, the female thread being a wedge thread. The threaded connection 1 satisfies the following expression, (1): 3%?(LP?SP)/LP?8%??(1). In expression (1), LP is the pitch between loading flanks 111 of the male thread 11, and SP is the pitch between stabbing flanks 112 of the male thread 11.

Abstract: This invention provides a threaded connection for pipes or tubes having excellent misalignment resistance and high torque on shoulder resistance, and also having excellent corrosion resistance properties, as well as a method for producing the threaded connection for pipes or tubes. The threaded connection for pipes or tubes includes a pin and a box. The pin and the box include contact surfaces having threaded portions and unthreaded metal contact portions. The threaded connection for pipes or tubes includes, on at least one of the contact surfaces of the pin and the box, surface roughness, a Zn—Ni alloy plating layer, a Cu—Sn—Zn alloy plating layer and a solid lubricant coating layer. These are deposited from the contact surface side in the order of: surface roughness, the Zn—Ni alloy plating layer, the Cu—Sn—Zn alloy plating layer and the solid lubricant coating layer.

Abstract: The disclosed threaded connection for steel pipes includes a pin including a tapered male thread part and a shoulder part, and a box including a tapered female thread part and a shoulder part. In a made up state in which the shoulder parts are in contact with each other, clearances are provided between crests of the male thread part and roots of the female thread part. At a longitudinal section that includes a pipe axis of the threaded connection, the crests of the male thread part are formed in a convex curve that is tangent to both first corner portions which are formed in an arc that connect the crests and load flanks, and second corner portions which are formed in an arc that connect the crests and stabbing flanks. A solid lubricant coating is provided on the surface of the male thread part.

Abstract: An electroplating apparatus is provided that minimizes unplated regions when an alloy plating layer is provided on the surface of a thread on a steel pipe. An electroplating apparatus (10) includes an electrode (1), sealing members (2, 3), and a plating-solution supply unit (4). The electrode (1) faces the thread (Tm). The sealing member (2) is positioned within the steel pipe (P1). The sealing member (3) is attached to the end portion of the steel pipe (P1) and, together with the sealing member (2), forms a receiving space (8). The plating-solution supply unit (4) includes a plurality of nozzles (42). The nozzles (42) are positioned within the receiving space (8) and adjacent one end of the thread (Tm) and arranged around the pipe axis of the steel pipe (P1). The plating-solution supply unit (4) injects a plating solution between the thread (Tm) and electrode (1) through the nozzles (42).

Abstract: A threaded connection for steel pipes having improved sealing performance is provided. A threaded connection (10) for steel pipes includes a pin (10) and a box (20). The pin (10) includes a nose (11), a pin shoulder surface (12), a pin sealing surface (13) and a male thread (14). The box (20) includes a box shoulder surface (22), a box sealing surface (23) and a female thread (24). When the position of the portion of the pin sealing surface (13) that first contacts the inner periphery of the box (20) during make-up defines a seal position (P), the distance between the seal position (P) and the end of the male thread (14) adjacent to the pin sealing surface (13) as measured in the pipe-axis direction is denoted by x, and the distance between the tip of the pin (10) and the end of the male thread (14) adjacent to the pin sealing surface (13) as measured in the pipe-axis direction is denoted by L, then, x/L is not smaller than 0.4 and not larger than 0.55.

Abstract: A threaded connection for steel pipe is provided that improves its internal-pressure sealability while maintaining the high external-pressure sealability of a threaded connection having a nose used in a steel pipe with large diameter and large wall thickness. In a threaded connection for connecting steel pipe bodies each having an outer diameter equal to or larger than 7 inches and a wall thickness equal to or larger than 0.7 inches, Expression (1) in the description is satisfied and tB/tL>1.

Abstract: A threaded connection for steel pipes is provided that exhibits improved sealability against the external pressure while maintaining the sealability against the internal pressure. A threaded connection for steel pipes includes a pin and a box. The pin includes a nose, a tapered inner male thread, a tapered outer male thread, a pin inner sealing surface, a pin intermediate shoulder surface, a pin intermediate sealing surface, and a pin annular portion. The box includes a recess corresponding to the nose, a tapered inner female thread, a tapered outer female thread, a box inner sealing surface, a box intermediate shoulder surface, a box intermediate sealing surface, and a box annular portion. The threaded connection satisfies expressions (1) and (2), provided below. ?1 is a taper slope of the inner male thread, and ?2 is a taper slope of the outer male thread. ? ? 1 > ?2 , and ( 1 ) 0.5 ? L ? ? 1 ? ?1 L ? ? 2 ? ?2 ? 1.

Abstract: The threaded connection for pipes includes a pin, a box and a Zn—Ni alloy plating layer. The pin has a pin-side contact surface that includes a pin-side thread part. The box has a box-side contact surface that includes a box-side thread part. The Zn—Ni alloy plating layer is formed on at least one of the pin-side contact surface and the box-side contact surface. The Zn—Ni alloy plating layer is consisting of Zn, Ni, trace amount of Cr and impurities. The trace amount of Cr content of the Zn—Ni alloy plating layer is 5.0×10 counts/sec or more in terms of Cr intensity as measured by secondary ion mass spectrometry using O2+ ions as bombarding ions.

Abstract: Protective device for a male end portion of a steel tube for use in a tubular hydrocarbon working string, the device including a cylindrical sleeve body having a main axis and defining an inner cavity intended to receive the male end portion, an engagement portion having the cylindrical sleeve body is split axially in at least two shells being held together by a junction, and the engagement portion is so configured to separate the at least two shells under exertion of a predefined axial force on a first or second engagement surface.

Abstract: A plug for a pressure test configured for a tubular component, the tubular component including a male threaded element at a free end, the male threaded element including a male thread and a sealing surface, the plug including a thread compatible with the male thread, an inner annular groove, and a sealing ring held in the groove such that the sealing ring is radially compressed between an outer periphery of the male threaded element and a bottom of the inner annular groove.

Abstract: The composition according to the present embodiment is a composition for forming a lubricant coating layer on a threaded connection for pipes or tubes, and contains Cr2O3, a metal soap, a wax and a basic metal salt of an aromatic organic acid. The threaded connection for pipes or tubes according to the present embodiment includes a pin and a box. The pin and the box each include a contact surface including a threaded portion. The threaded connection for pipes or tubes includes, as an outermost layer, a lubricant coating layer formed from the aforementioned composition on at least one of the contact surfaces of the pin and the box.

Abstract: A method for assembling a threaded connection for a steel pipe, which connects a first pipe formed with a pin having a truncated cone shape at an end thereof, and a second pipe formed with a box having an opening end. The pin includes a male thread portion, which is a tapered thread, and a seal portion, which includes a tapered surface. The box includes a female thread portion, which is a tapered thread, and a seal portion, which includes a tapered surface. The tapered surface of the pin has a minimum diameter smaller than a maximum diameter of the tapered surface of the box. The method includes making-up the male thread portion and the female thread portion by screwing, whereby a root of the male thread portion and a crest of the female thread portion come into contact with each other after the seal portion of the pin and the seal portion of the box come into contact with each other.

Abstract: 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.

Abstract: A lifting plug is for lifting a tubular column in a gas and/or oil well. The lifting plug is a one-piece component capable of being manipulated by a jaw of an oil platform elevator. The plug includes a body to be screwed onto the tubular column. The body includes two outer flanges: an upper flange and an intermediate flange. The flanges are such that the jaw of the elevator can be arranged between these two flanges. The upper flange forms a bearing shoulder for the jaw to bear on and the intermediate flange includes a bore for manipulating the plug allowing the insertion through the body of a pin emerging at two different points of the intermediate collar. The plug can be rotated by the pin while remaining engaged in the jaw.