WO2018180218A1 - 鋼管用ねじ継手 - Google Patents
鋼管用ねじ継手 Download PDFInfo
- Publication number
- WO2018180218A1 WO2018180218A1 PCT/JP2018/008155 JP2018008155W WO2018180218A1 WO 2018180218 A1 WO2018180218 A1 WO 2018180218A1 JP 2018008155 W JP2018008155 W JP 2018008155W WO 2018180218 A1 WO2018180218 A1 WO 2018180218A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stubbing
- male screw
- screw
- pin
- thread
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 230000008878 coupling Effects 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 17
- 238000005859 coupling reaction Methods 0.000 claims description 17
- 230000007423 decrease Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 abstract description 17
- 238000007906 compression Methods 0.000 abstract description 17
- 238000007789 sealing Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 17
- 239000003129 oil well Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 238000011056 performance test Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
- F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/06—Screw-threaded joints; Forms of screw-threads for such joints characterised by the shape of the screw-thread
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Definitions
- the present disclosure relates to a threaded joint for steel pipes, and more particularly to a threaded joint for connecting two steel pipes to each other.
- oil wells For example, exploration or production of oil wells and natural gas wells (hereinafter collectively referred to as “oil wells”), development of unconventional resources such as oil sands and shale gas, carbon dioxide recovery and storage (CCS (Carbon Dioxide Capture and Storage)), geothermal power generation, or hot springs use steel pipes called oil well pipes. A threaded joint is used for the connection between the steel pipes.
- This type of threaded joint for steel pipes is roughly divided into a coupling type and an integral type.
- the coupling type one of the pair of pipes to be connected is a steel pipe, and the other pipe is a coupling.
- male threads are formed on the outer periphery of both ends of the steel pipe, and female threads are formed on the inner periphery of both ends of the coupling. Then, the male screw of the steel pipe is screwed into the female screw of the coupling, whereby both are fastened and connected.
- both of the pair of pipes to be connected are steel pipes, and no separate coupling is used.
- a male screw is formed on the outer periphery of one end of the steel pipe, and a female screw is formed on the inner periphery of the other end.
- the external thread of one steel pipe is screwed in the internal thread of the other steel pipe, and both are fastened and connected by this.
- the joint portion of the pipe end portion where the male screw is formed includes an element inserted into the female screw, and is therefore referred to as a “pin”.
- the joint portion at the end of the tube in which the internal thread is formed includes an element for receiving the external thread, and is therefore referred to as a “box”. Since these pins and boxes are the ends of the pipe material, they are both tubular.
- the result is a structure in which the oil well pipes are arranged in multiple layers.
- the inner and outer diameters of the joints are connected to the well pipes. Threaded joints are often used that are about the same as or slightly larger than the inner and outer diameters. By using such a threaded joint, it is possible to minimize the gaps between the oil well pipes arranged in multiple layers, and even if deep, the well diameter can be efficiently developed without increasing the diameter of the well.
- the threaded joint has an internal fluid pressure (hereinafter also referred to as “internal pressure”) and an external fluid pressure (hereinafter also referred to as “external pressure”). Excellent sealing performance is required. Furthermore, for example, when used in a deep oil well, a large tensile load or compressive load is applied to the threaded joint due to thermal expansion of the oil well pipe. Even in such an environment, the threaded joint is also required to have excellent sealing performance.
- metal seal As a threaded joint for ensuring sealing performance, one having a metal-metal contact seal (hereinafter referred to as “metal seal”) is known.
- metal seals the diameter of the seal surface of the pin is slightly larger than the diameter of the seal surface of the box (this difference in diameter is referred to as “interference amount”), and the seal surfaces are fitted together by fastening a screw joint. Due to the amount of interference, the seal surface of the pin is reduced in diameter, the seal surface of the box is expanded, and contact pressure is generated on the seal surface due to the elastic recovery force that each seal surface returns to its original diameter.
- the structure is in close contact and exhibits sealing performance.
- JP-A-8-303657 states in paragraph 0041, “In order to facilitate the introduction and removal of tools, the engagement flank (engaging flank or stabbing flank) of the male screw teeth should be given a larger angle. This angle is for example about 10 ° to 45 ° relative to a plane perpendicular to the axis of the screw, and the male element is introduced into the female housing without damaging the screw by catching. To assist this, it is preferable to provide an angled engagement flank at the largest diameter portion connected to the tip of the male screw tooth, which angle is between 30 ° and 70 ° with respect to the plane perpendicular to the screw axis. It is advantageous. "
- JP-A-8-303657 has excellent performance.
- the present inventors have newly found that there is room for improvement in terms of the ease of cross-threading and performance when a compression load is applied, as will be described in detail later.
- An object of the present disclosure is to provide a threaded joint for steel pipes that is less likely to cause cross-threading and has good compression load resistance.
- the threaded joint for steel pipes includes a tubular pin and a tubular box.
- the pin is formed at one end of the steel pipe.
- the box is fastened to the pin by inserting the pin.
- the pin includes a male thread.
- the male screw is formed on the outer periphery of the pin.
- the box includes an internal thread.
- the female screw corresponds to the male screw and is formed on the inner periphery of the box.
- the male screw and the female screw are trapezoidal screws and taper screws. In the fastened state, at least a part of the male screw and the female screw constitutes a screw seal.
- the male screw includes a male screw thread surface, a male screw bottom surface, a male screw stubbing surface, and a male screw load surface.
- the male screw stubbing surface is formed on the side close to the tip of the pin.
- the male thread load surface is formed on the side far from the tip of the pin.
- the male screw stubbing surface has a first male screw stubbing step and a second male screw stubbing step.
- the first male screw stubbing stage is formed on the side far from the tube axis of the steel pipe and has a stubbing angle of ⁇ 10 to 15 degrees.
- the second male screw stubbing step is formed on the side close to the tube axis and has a stubbing angle of 20 to 60 degrees.
- the second male screw stubbing stage has a height of 20 to 60% of the height of the male screw.
- the female screw includes a female screw thread surface, a female screw bottom surface, a female screw stubbing surface, and a female screw load surface.
- the female screw thread surface faces the male screw bottom surface.
- the female screw bottom faces the male screw thread surface.
- the female screw stubbing surface faces the male screw stubbing surface.
- the female thread loading surface faces the male thread loading surface.
- the female screw stubbing surface has a first female screw stubbing step and a second female screw stubbing step.
- the first female thread stubbing step is formed on the side far from the tube axis and has the same stubbing angle as the stubbing angle of the first male screw stubbing step.
- the second female thread stubbing step is formed on the side close to the tube axis and has the same stubbing angle as the stubbing angle of the second male screw stubbing step.
- FIG. 1 is a longitudinal sectional view of a threaded joint for steel pipes according to Embodiment 1 along the pipe axis direction.
- FIG. 2 is an enlarged longitudinal sectional view showing the shapes of the male screw and the female screw shown in FIG.
- FIG. 3 is an enlarged longitudinal sectional view of the male screw and the female screw shown in FIG.
- FIG. 4 is an enlarged vertical sectional view of the pin shown in FIG.
- FIG. 5 is a longitudinal sectional view of the threaded joint for steel pipes according to the second embodiment along the pipe axis direction.
- FIG. 6 is a longitudinal sectional view of the threaded joint for steel pipes according to the third embodiment along the pipe axis direction.
- FIG. 7 is an enlarged longitudinal sectional view of a male screw and a female screw in a threaded joint according to the prior art.
- FIG. 8 is a diagram showing a state in which steel pipes are connected on the rig.
- FIG. 9 is a longitudinal sectional view for explaining a cross thread that occurs when steel pipes are connected.
- FIG. 10 is an enlarged vertical cross-sectional view when a cross thread is generated by a male screw and a female screw having a small stubbing angle.
- FIG. 11 is an enlarged longitudinal sectional view when a cross thread is caused by a male screw and a female screw having a large stubbing angle.
- FIG. 12 is an enlarged vertical cross-sectional view when a cross thread occurs in the male screw and the female screw shown in FIGS. 2 and 3.
- FIG. 13 is an enlarged longitudinal sectional view when a cross thread is caused by the male screw and the female screw shown in FIG.
- FIG. 14 is an enlarged longitudinal sectional view when a cross thread occurs when there is a cutting beam with the male screw and the female screw shown in FIG. 7.
- FIG. 15 is an enlarged longitudinal sectional view when a cross thread occurs when there is a cutting beam between the male screw and the female screw shown in FIGS. 2 and 3.
- FIG. 16 is a longitudinal sectional view showing a compression load test result of the threaded joint having the male screw and the female screw shown in FIGS. 2 and 3.
- FIG. 17 is a longitudinal sectional view showing a compression load test result of the threaded joint having the male screw and the female screw shown in FIG. FIG.
- FIG. 18 is a diagram illustrating an example of a calculation result of contact stress on the stub surface when a compression load is applied to the male screw illustrated in FIGS. 2 and 3.
- FIG. 19 is a diagram illustrating an example distribution of the calculation result of the contact stress of the stub surface when the compression load of the male screw illustrated in FIG. 7 is applied.
- the threaded joint for steel pipes is a threaded joint for connecting two steel pipes to each other.
- the present threaded joint includes a tubular pin and a tubular box.
- the pin is formed at one end of the steel pipe.
- the box is fastened to the pin by inserting the pin.
- the pin includes a male thread.
- the male screw is formed on the outer periphery of the pin.
- the box includes an internal thread.
- the female screw corresponds to the male screw and is formed on the inner periphery of the box.
- the male screw and the female screw are trapezoidal screws and taper screws. In the fastened state, at least a part of the male screw and the female screw constitutes a screw seal.
- the male screw includes a male screw thread surface, a male screw bottom surface, a male screw stubbing surface, and a male screw load surface.
- the male screw stubbing surface is formed on the side close to the tip of the pin.
- the male thread load surface is formed on the side far from the tip of the pin.
- the male screw stubbing surface has a first male screw stubbing step and a second male screw stubbing step.
- the first male screw stubbing stage is formed on the side far from the tube axis of the steel pipe and has a stubbing angle of ⁇ 10 to 15 degrees.
- the second male screw stubbing step is formed on the side close to the tube axis and has a stubbing angle of 20 to 60 degrees.
- the second male screw stubbing stage has a height of 20 to 60% of the height of the male screw.
- the female screw includes a female screw thread surface, a female screw bottom surface, a female screw stubbing surface, and a female screw load surface.
- the female screw thread surface faces the male screw bottom surface.
- the female screw bottom faces the male screw thread surface.
- the female screw stubbing surface faces the male screw stubbing surface.
- the female thread loading surface faces the male thread loading surface.
- the female screw stubbing surface has a first female screw stubbing step and a second female screw stubbing step.
- the first female thread stubbing step is formed on the side far from the tube axis and has the same stubbing angle as the stubbing angle of the first male screw stubbing step.
- the second female thread stubbing step is formed on the side close to the tube axis and has the same stubbing angle as the stubbing angle of the second male screw stubbing step.
- the male screw stubbing surface is formed on the side far from the tube axis of the steel pipe, and is formed on the side close to the tube axis, the first male screw stubbing step having a stubbing angle of ⁇ 10 to 15 degrees, and 20 to 60 And a female screw stubbing surface formed on the side far from the tube axis, the first female screw stubbing step having the same stubbing angle as the stubbing angle of the first male screw stubbing step, and the side close to the tube axis And a second female screw stubbing step having the same stubbing angle as that of the second male screw stubbing step.
- the male screw further includes a first male screw round surface.
- the first male screw round surface is formed at a corner between the male screw thread surface and the male screw stubbing surface.
- the internal thread further includes a first internal thread round face.
- the first female screw round surface is formed at a corner between the female screw thread surface and the female screw stubbing surface.
- the male screw further includes a second male screw round surface, a third male screw round surface, and a fourth male screw round surface.
- the second male screw round surface is formed at a corner between the male screw thread surface and the male screw load surface.
- the third male screw round surface is formed at a corner between the male screw bottom surface and the male screw stubbing surface.
- the fourth male screw round surface is formed at a corner between the male screw bottom surface and the male screw load surface.
- the female screw further includes a second female screw round surface, a third female screw round surface, and a fourth female screw round surface.
- the second female screw round surface is formed at a corner between the female screw thread surface and the female screw load surface.
- the third female screw round surface is formed at a corner between the female screw bottom surface and the female screw stubbing surface.
- the fourth female screw round surface is formed at a corner between the female screw bottom surface and the female screw load surface.
- the male thread load surface has a load angle of -10 to 3 degrees.
- the internal thread load surface has the same load angle as the external thread load surface.
- the male screw thread surface, the male screw bottom surface, the female screw thread surface, and the female screw bottom surface are formed in parallel with the tube axis.
- the male screw stubbing surface and the female screw stubbing surface have a clearance of 60 to 120 ⁇ m between them in the fastened state.
- the sealing performance is improved and goling (burn-in) is less likely to occur.
- the male screw thread surface and the female screw bottom surface have a gap of 0 to 50 ⁇ m between them in the fastened state.
- the male screw bottom surface and the female screw thread surface have a clearance of 0 to 50 ⁇ m between them in the fastened state.
- the pin further includes a pin shoulder surface.
- the pin shoulder surface is formed at the tip of the pin.
- the box further includes a box shoulder surface. The box shoulder surface comes into contact with the pin shoulder surface in the fastened state.
- the male screw includes a taper screw having a taper ratio that decreases with increasing distance from the tip of the pin.
- the contact pressure gradually decreases as the distance from the tip of the pin increases.
- the pin further includes a pin seal surface.
- the pin seal surface is formed between the tip of the pin and the male screw and on the outer periphery of the pin.
- the box further includes a box seal surface. The box seal surface faces the pin seal surface, is formed on the inner periphery of the box, and is in close contact with the pin seal surface in the fastened state.
- a part of the male screw and the female screw constituting the screw seal has a length that is three times or more the thickness of the steel pipe in the pipe axis direction.
- the threaded joint for steel pipes is a threaded joint for connecting two steel pipes to each other.
- the present threaded joint includes a tubular first pin, a tubular second pin, and a coupling.
- a 1st pin is formed in one front-end
- a 2nd pin is formed in the other front-end
- the coupling includes a tubular first box and a tubular second box. The first box is fastened to the first pin by inserting the first pin. The second box is formed on the opposite side of the first box, and the second pin is inserted and fastened to the second pin.
- Each of the first and second pins includes a male screw. The male screw is formed on the outer periphery of the pin.
- Each of the first and second boxes includes an internal thread.
- the female screw corresponds to the male screw and is formed on the inner periphery of the box.
- the male screw and the female screw are trapezoidal screws and taper screws. In the fastened state, at least a part of the male screw and the female screw constitutes a screw seal.
- the male screw includes a male screw thread surface, a male screw bottom surface, a male screw stubbing surface, and a male screw load surface.
- the male screw stubbing surface is formed on the side close to the tip of the pin.
- the male thread load surface is formed on the side far from the tip of the pin.
- the male screw stubbing surface has a first male screw stubbing step and a second male screw stubbing step.
- the first male screw stubbing stage is formed on the side far from the tube axis of the steel pipe and has a stubbing angle of ⁇ 10 to 15 degrees.
- the second male screw stubbing step is formed on the side close to the tube axis and has a stubbing angle of 20 to 60 degrees.
- the second male screw stubbing stage has a height of 20 to 60% of the height of the male screw.
- the female screw includes a female screw thread surface, a female screw bottom surface, a female screw stubbing surface, and a female screw load surface.
- the female screw thread surface faces the male screw bottom surface.
- the female screw bottom faces the male screw thread surface.
- the female screw stubbing surface faces the male screw stubbing surface.
- the female thread loading surface faces the male thread loading surface.
- the female screw stubbing surface has a first female screw stubbing step and a second female screw stubbing step.
- the first female thread stubbing step is formed on the side far from the tube axis and has the same stubbing angle as the stubbing angle of the first male screw stubbing step.
- the second female thread stubbing step is formed on the side close to the tube axis and has the same stubbing angle as the stubbing angle of the second male screw stubbing step.
- the male screw stubbing surface is formed on the side far from the tube axis of the steel pipe, and is formed on the side close to the tube axis, the first male screw stubbing step having a stubbing angle of ⁇ 10 to 15 degrees, and 20 to 60 And a female screw stubbing surface formed on the side far from the tube axis, the first female screw stubbing step having the same stubbing angle as the stubbing angle of the first male screw stubbing step, and the side close to the tube axis And a second female screw stubbing step having the same stubbing angle as that of the second male screw stubbing step.
- the first pin further includes a first pin shoulder surface.
- the first pin shoulder surface is formed at the tip of the first pin.
- the second pin further includes a second pin shoulder surface.
- a 2nd pin shoulder surface is formed in the front-end
- a steel pipe threaded joint 10 is a threaded joint for connecting two steel pipes 20 to each other.
- the threaded joint 10 includes a tubular pin 30 and a tubular box 40.
- the pin 30 is formed at one end portion 22 of the steel pipe 20.
- the box 40 is fastened to the pin 30 by inserting the pin 30.
- the threaded joint 10 for a steel pipe is a coupling type, and includes two pins 20 and 20 and a coupling 50.
- One pin 30 is formed at the tip 22 of one steel pipe 20.
- the other pin 30 is formed at the tip 22 of the other steel pipe 20.
- the coupling 50 includes two boxes 40 and 40 and an annular protrusion 52.
- One box 40 is formed at one end of the coupling 50.
- the other box 40 is formed at the other end of the coupling 50.
- the protrusion 52 is formed at the center of the coupling 50.
- One box 40 is fastened to one pin 30 by inserting one pin 30.
- the other box 40 is formed on the opposite side of the one box 40, and the other pin 30 is inserted and fastened to the other pin 30.
- the pin 30 includes a male screw 31.
- the male screw 31 is formed on the outer periphery of the pin 30.
- Box 40 includes an internal thread 41.
- the female screw 41 corresponds to the male screw 31 and is formed on the inner periphery of the box 40.
- the male screw 31 and the female screw 41 are trapezoidal screws and taper screws. That is, the male screw 31 is formed in a spiral shape on the outer periphery of the pin 30, and the diameter of the spiral decreases as the tip of the pin 30 is approached.
- the female screw 41 is formed in a spiral shape on the inner periphery of the box 40, and the diameter of the spiral increases as the opening end of the box 40 is approached.
- a preferable taper ratio of the taper screw is 6.0 to 18.0%.
- the taper ratio is designed so that an appropriate thread length can be obtained in relation to the thickness of the steel pipe.
- the taper ratio may be constant, but it is preferable that the taper ratio of the male screw 31 decreases as the distance from the tip of the pin 30 increases, as will be described in detail later.
- the male screw 31 and the female screw 41 constitutes a screw seal.
- a part of the male screw and the female screw constituting the screw seal has a length that is three times or more the wall thickness of the steel pipe 20 in the pipe axis direction.
- the male screw and the female screw constituting the screw seal are complete screws. The longer the screw seal length, the better the sealing performance. On the other hand, if the length of the screw seal is too long, it is costly and troublesome to thread, and there is a risk that goling is likely to occur during fastening.
- the length of the screw seal is preferably 5 times or less the wall thickness. In FIG. 1, the threaded joint 10 does not have a metal seal.
- the male screw 31 includes a male screw thread surface 32, a male screw bottom surface 33, a male screw stubbing surface 34, and a male screw load surface 35.
- the male screw stubbing surface 34 is formed on the side close to the tip of the pin 30.
- the male thread load surface 35 is formed on the side far from the tip of the pin 30.
- the male screw stubbing surface 34 has two male screw stubbing steps 341 and 342.
- the male screw stubbing step 341 is formed on the far side from the tube axis X of the steel pipe 20 and has a stubbing angle ⁇ 1.
- the male screw stubbing step 342 is formed on the side close to the tube axis X and has a stubbing angle ⁇ 2.
- the stubbing angles ⁇ 1 and ⁇ 2 are angles at which the male screw stubbing surface 34 (male screw stubbing steps 341 and 342) is inclined with respect to the plane Y perpendicular to the tube axis X. When the stub surface 34 is overhanging, the stub angle ⁇ 1 is negative.
- the stubbing angle ⁇ 2 is larger than the stubbing angle ⁇ 1 ( ⁇ 2> ⁇ 1).
- the stubbing angle ⁇ 1 is ⁇ 10 to 15 degrees, preferably 8 to 12 degrees, for example, about 10 degrees.
- the stubbing angle ⁇ 2 is 20 to 60 degrees, preferably 28 to 32 degrees, for example, about 30 degrees. Therefore, the male screw stubbing surface 34 is recessed in the middle.
- the height of the male screw stubbing step 342 (the length from the male screw bottom surface 33 to the boundary between the male screw stubbing steps 341 and 342) is 25 to 60%, for example, 35% of the height of the male screw.
- the female screw 41 includes a female screw thread surface 42, a female screw bottom surface 43, a female screw stubbing surface 44, and a female screw load surface 45.
- the female screw thread face 42 faces the male screw bottom face 33.
- the female screw bottom surface 43 faces the male screw thread surface 32.
- the female screw stubbing surface 44 faces the male screw stubbing surface 34.
- the female screw load surface 45 faces the male screw load surface 35.
- the female screw stubbing surface 44 has two female screw stubbing steps 441 and 442.
- the female screw stubbing step 441 is formed on the side far from the tube axis X, and has the same stubbing angle ⁇ 1 as the stubbing angle ⁇ 1 of the male screw stubbing step 341.
- the female screw stubbing step 442 is formed on the side close to the tube axis X and has the same stubbing angle ⁇ 2 as the stubbing angle ⁇ 2 of the male screw stubbing step 342. Therefore, the female thread stubbing surface 44 is swelled substantially in the middle.
- the stubbing angles ⁇ 1 and ⁇ 2 of the male screw stubbing steps 341 and 342 and the stubbing angles ⁇ 1 and ⁇ 2 of the female screw stubbing steps 441 and 442 may not be completely the same, and may be substantially the same. That is, the stubbing angles ⁇ 1 and ⁇ 2 may have an error associated with cutting.
- the female screw stubbing step 442 preferably has the same height as the male screw stubbing step 342. Thereby, the clearance gap between the screw surfaces of a pin and a box does not become unnecessarily large, and favorable sealing performance can be exhibited with a screw seal structure.
- the height of the male screw stubbing step 342 and the height of the female screw stubbing step 442 may not be completely the same, and may be substantially the same. That is, these heights may have errors associated with cutting.
- the male screw 31 further includes male screw round surfaces 36-39.
- the male screw round surface 36 is formed at a corner between the male screw thread surface 32 and the male screw stubbing surface 34.
- the male screw round surface 37 is formed at a corner between the male screw thread surface 32 and the male screw load surface 35.
- the male screw round surface 38 is formed at a corner between the male screw bottom surface 33 and the male screw stubbing surface 34.
- the male screw round surface 39 is formed at a corner between the male screw bottom surface 33 and the male screw load surface 35.
- the internal thread 41 includes internal thread round surfaces 46-49.
- the female screw round surface 46 is formed at a corner between the female screw thread surface 42 and the female screw stubbing surface 44.
- the female screw round surface 47 is formed at a corner between the female screw thread surface 42 and the female screw load surface 45.
- the female screw round surface 48 is formed at a corner between the female screw bottom surface 43 and the female screw stubbing surface 44.
- the female screw round surface 49 is formed at a corner between the female screw bottom surface 43 and the female screw load surface 45.
- the round surfaces 36 to 39 and 46 to 49 are so-called R surfaces (round chamfer surfaces) and have a predetermined radius of curvature.
- the radius of curvature is 0.1 to 1.2 mm, preferably 0.3 to 0.8 mm.
- the male thread load surface 35 has a load angle ⁇ .
- the load angle ⁇ is an angle at which the male thread load surface 35 is inclined with respect to the plane Y perpendicular to the tube axis X. When the load surface 35 is overhanging, the load angle ⁇ is negative.
- the load angle ⁇ is -10 to 3 degrees, preferably -5 to -1 degrees, for example, about -3 degrees.
- the female screw load surface 45 has the same load angle ⁇ as the load angle ⁇ of the male screw load surface 35.
- the load angle ⁇ of the male screw load surface 35 and the load angle ⁇ of the female screw load surface 45 do not have to be completely the same, and may be substantially the same. That is, the load angle ⁇ may have an error associated with cutting.
- the male thread surface 32, the male thread bottom surface 33, the female thread surface 42, and the female thread bottom surface 43 are formed in parallel with the tube axis X. Specifically, the lines of the surfaces 32, 33, 42, and 43 appearing in the longitudinal section including the tube axis X are parallel to the tube axis X.
- the male screw stubbing surface 34 and the female screw stubbing surface 44 have a clearance of 60 to 120 ⁇ m between them in the fastened state. Further, the male screw thread surface 32 and the female screw bottom surface 43 have a gap of 0 to 50 ⁇ m between them in the fastened state. The male screw bottom surface 33 and the female screw thread surface 42 also have a gap of 0 to 50 ⁇ m between them in the fastened state.
- the pin 30 further includes a pin shoulder surface 24 formed at the tip of the pin 30.
- the box 40 further includes a box shoulder surface 54 that contacts the pin shoulder surface 24 in a fastened state.
- male screw 31 includes a taper screw having taper ratios TR1 to TR4 that decreases as the distance from the tip of pin 30 increases.
- TR1 12.5%
- TR2 12.0%
- TR3 11.5%
- TR4 11.0%.
- the threaded joint 10 may include a metal seal.
- the pin 30 further includes a pin seal surface 26 formed on the outer periphery of the pin 30 between the tip of the pin 30 and the male screw 31.
- the box 50 further includes a box seal surface 56 that faces the pin seal surface 26 and is formed on the inner periphery of the box 50 and is in close contact with the pin seal surface 26 in a fastened state.
- the pin seal surface 26 and the box seal surface 56 constitute a metal seal.
- the box 50 may not include the protrusion 52 described above.
- the pin shoulder surface 24 of one pin 30 and the pin shoulder surface 24 of the other pin are in contact with each other in the fastened state.
- the third embodiment has a so-called Pin to Pin structure.
- the male thread 31p of the pin includes a male thread crest surface 32p, a male thread bottom surface 33p, a male thread stubbing surface 34p, and a male thread load surface 35p.
- the male screw stubbing surface 34p has two male screw stubbing steps 341p and 342p.
- the stubbing angle ⁇ 2p of the stubbing stage 342p is smaller than the stubbing angle ⁇ 1p of the stubbing stage 341p ( ⁇ 2p ⁇ 1p). Therefore, the male screw stubbing surface 34p is swelled substantially in the middle.
- the female screw 41p of the box includes a female screw thread surface 42p, a female screw bottom surface 43p, a female screw stubbing surface 44p, and a female screw load surface 45p.
- the internal thread stubbing surface 44p has two internal thread stubbing steps 441p and 442p.
- the stubbing angle ⁇ 1p of the female screw stubbing step 441p is the same as the stubbing angle ⁇ 1p of the male screw stubbing step 341p.
- the stubbing angle ⁇ 2p of the female screw stubbing step 442p is the same as the stubbing angle ⁇ 2p of the male screw stubbing step 342p. Accordingly, the female screw stubbing surface 44p is recessed substantially in the middle.
- the lower limit of the pitch deviation angle at which cross-threading occurs depends on the thread pitch and the outer diameter of the steel pipe.
- the screw pitch is larger than 3 threads / inch, the screw design becomes difficult.
- the pitch deviation angle at which cross threads occur at 3 threads / inch is close to 1 degree.
- it is desirable that the steel pipe has a structure in which cross threads are unlikely to occur particularly in a large-diameter steel pipe having an outer diameter exceeding 16 inches.
- even a steel pipe having an outer diameter of 16 inches or less may have a structure in which cross-threading hardly occurs.
- This embodiment aims to maintain cross-threading by making the stubbing surface two stages, and to maintain the compression load resistance and galling resistance without deteriorating.
- the sealing performance by the screw surface can be maintained.
- the embodiment shown in FIG. 12 reduces the stubbing angle of the stubbing stage 441 on the side close to the box body having high rigidity. Receive a lot. Therefore, the engagement of the screw can be maintained up to the limit compression load. Moreover, even if an internal pressure is applied simultaneously with the compressive load, a gap is not generated in the radial direction of the screw, and the sealing performance can be maintained. Furthermore, since the internal thread restrains the external thread to the limit where jump-in occurs due to the limit compressive load, the engagement of the screw is difficult to come off.
- the male screw of the pin becomes a complete screw at the tip end and an incomplete screw at the rear end in the tube axis direction.
- a flash BR caused by a tool is generated at the end of the thread surfaces 32 p and 32 of the incomplete screw at the time of cutting.
- the flash BR locks with the thread surface of the box and cross-threading occurs.
- the lock is released in order to return the relative inclination of the male thread with respect to the female thread, it faces the flash BR. It is better that the surface is flat and the stubbing angle is large.
- the incompletely threaded beam BR does not slip due to the contact with the female thread round surface 46p between the female thread surface 42p and the stubbing surface 44p of the box. Therefore, in the form shown in FIG. 14, the lock is difficult to release and cross-threading is likely to occur.
- the lock is easily released and cross-threading hardly occurs. Moreover, the compression load resistance performance and galling resistance performance can be maintained without deteriorating.
- the threaded joint according to the example has the two-stage stubbing surface described above.
- the stubbing angle ⁇ 1 is 10 degrees, and the stubbing angle ⁇ 2 is 30 degrees.
- Both Comparative Examples 1 and 2 have only one stubbing surface as usual.
- the stubbing angle of Comparative Example 1 is 10 degrees, and the stubbing angle of Comparative Example 2 is 30 degrees.
- the above steel pipes were connected with the threaded joints according to Examples and Comparative Examples 1 and 2, and the stubbing performance, makebreak performance and sealing performance of these threaded joints were evaluated by tests. Specifically, as a stubbing performance test, the steel pipe is connected with a threaded joint until the radial interference of the threaded portion occurs in a situation simulating the state where the steel pipe suspended on the rig shakes during oil well pipe running Then, a test (Stabbing Make / Stabbing Break test) was performed and the stubbing performance was evaluated based on whether or not cross-threading occurred.
- a make-break performance test a test (Make / Break test) is performed in which the steel pipe is tightened and tightened until the amount of interference in the radial direction of the screw joint reaches a predetermined amount, and the make-break performance is evaluated based on whether or not goling occurs. did.
- a sealing performance test a test is performed to apply a compressive load equivalent to the nominal yield strength of a steel pipe (100%) to a threaded joint that has been filled with liquid, and the sealing performance can be improved depending on the presence or absence of liquid leakage. evaluated.
- the stubbing performance test was performed five times, but no cross-thread occurred. Moreover, although the Example performed the make-break performance test 3 times, it did not raise
- the male screw and the female screw of the threaded joint according to Comparative Example 3 also have two stages of stubbing surfaces.
- the threaded joint according to Comparative Example 3 is the threaded joint according to the above-described prior art.
- the stubbing angle ⁇ 1 is 30 degrees
- the stubbing angle ⁇ 2 is 10 degrees.
- FIG. 16 and FIG. 17 show an example of calculation results when a simple compression load is simulated for the threaded joint according to Example and Comparative Example 3.
- the pin 30 shows a state in which buckling occurs due to an excessive compressive load.
- the amount of deformation due to buckling is smaller in the example shown in FIG. 16 than in Comparative Example 3 shown in FIG. Therefore, it was found that the example is less likely to buckle than the comparative example 3, that is, has better compression load resistance performance.
- FIG. 18 is an example of contact stress distribution in the embodiment.
- FIG. 17 is an example of contact stress distribution in Comparative Example 3.
- the contact stress of the stub surface at the time of applying the compressive load was higher on the surface having the smaller stub angle among the two stages of stub surfaces. That is, it is presumed that the embodiment of FIG. 18 has a better compressive load resistance performance because it supports higher contact stress on the surface closer to the box body side having higher rigidity.
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Abstract
Description
以下、鋼管用ねじ継手の実施形態について図面を参照しつつ説明する。図中同一及び相当する構成については同一の符号を付し、同じ説明を繰り返さない。
図5に示されるように、ねじ継手10は、メタルシールを備えていてもよい。具体的には、ピン30はさらに、ピン30の先端と雄ねじ31との間であってピン30の外周に形成されるピンシール面26を含む。ボックス50はさらに、ピンシール面26と対向し、ボックス50の内周に形成され、締結状態でピンシール面26と密着するボックスシール面56を含む。ピンシール面26とボックスシール面56とがメタルシールを構成する。
図6に示されるように、ボックス50は、上述した突出部52を備えていなくてもよい。この場合、一方のピン30のピンショルダ面24と、他方のピンのピンショルダ面24とは、締結状態で互いに接触する。この実施形態3は、いわゆるPin to Pin構造を有する。
図7を参照して、特開平8-303657号公報に開示されるねじ継手においては、ピンの雄ねじ31pは、雄ねじ山面32pと、雄ねじ底面33pと、雄ねじスタビング面34pと、雄ねじロード面35pとを含む。雄ねじスタビング面34pは、2つの雄ねじスタビング段341p,342pを有する。スタビング段342pのスタビング角α2pはスタビング段341pのスタビング角α1pよりも小さい(α2p<α1p)。したがって、雄ねじスタビング面34pはほぼ中腹で膨らんでいる。
図8に示されるように、リグ上で鋼管20を接続するとき、カップリング50付きの鋼管20を吊り下げ、ねじのスタビングを行う。ねじを嵌め合わせ、回転させて締め付ける過程において、ねじを回転させることなく嵌め合わせられる位置を「スタビング位置」という。鋼管20とカップリング50の管軸が一致した状態の理想的なスタビング位置では、雄ねじ山面と雌ねじ山面とは全体で接触している。しかし、海上や陸上での作業時には、波や風の影響を受けて吊り下げられた鋼管20が揺れるため、1度程度の揺れ角を伴うことが多い。
下記の通り、実際の鋼管を用いた。
・寸法:18-5/8、136#(公称外径473.08mm、肉厚14.71mm)
・材料:API(American Petroleum Institute)規格のP110鋼(公称降伏強度862N/mm2、弾性係数205kN/mm2、ポアソン比0.3)
実施例と同様に、比較例3に係るねじ継手の雄ねじ及び雌ねじも2段のスタビング面を有する。比較例3に係るねじ継手は上述した先行技術に係るねじ継手である。比較例3のスタビング角α1は30度であり、スタビング角α2は10度である。
Claims (15)
- ねじ継手であって、
鋼管の一方の先端部に形成される管状のピンと、
前記ピンが挿入されて前記ピンと締結される管状のボックスとを備え、
前記ピンは、前記ピンの外周に形成される雄ねじを含み、
前記ボックスは、前記雄ねじに対応し、前記ボックスの内周に形成される雌ねじを含み、
前記雄ねじ及び前記雌ねじは、台形ねじであり、かつ、テーパねじであり、
締結状態で前記雄ねじ及び前記雌ねじの少なくとも一部はねじシールを構成し、
前記雄ねじは、
雄ねじ山面と、
雄ねじ底面と、
前記ピンの先端に近い側に形成される雄ねじスタビング面と、
前記ピンの先端から遠い側に形成される雄ねじロード面とを含み、
前記雄ねじスタビング面は、
前記鋼管の管軸から遠い側に形成され、-10~15度のスタビング角を有する第1雄ねじスタビング段と、
前記管軸に近い側に形成され、20~60度のスタビング角を有する第2雄ねじスタビング段とを有し、
前記第2雄ねじスタビング段は、前記雄ねじの高さの20~60%の高さを有し、
前記雌ねじは、
前記雄ねじ底面と対向する雌ねじ山面と、
前記雄ねじ山面と対向する雌ねじ底面と、
前記雄ねじスタビング面と対向する雌ねじスタビング面と、
前記雄ねじロード面と対向する雌ねじロード面とを含み、
前記雌ねじスタビング面は、
前記管軸から遠い側に形成され、前記第1雄ねじスタビング段のスタビング角と同じスタビング角を有する第1雌ねじスタビング段と、
前記管軸に近い側に形成され、前記第2雄ねじスタビング段のスタビング角と同じスタビング角を有する第2雌ねじスタビング段とを有する、ねじ継手。 - 請求項1に記載のねじ継手であって、
前記雄ねじはさらに、
前記雄ねじ山面と前記雄ねじスタビング面との間の角に形成される第1雄ねじラウンド面を含み、
前記雌ねじはさらに、
前記雌ねじ山面と前記雌ねじスタビング面との間の角に形成される第1雌ねじラウンド面を含む、ねじ継手。 - 請求項2に記載のねじ継手であって、
前記雄ねじはさらに、
前記雄ねじ山面と前記雄ねじロード面との間の角に形成される第2雄ねじラウンド面と、
前記雄ねじ底面と前記雄ねじスタビング面との間の角に形成される第3雄ねじラウンド面と、
前記雄ねじ底面と前記雄ねじロード面との間の角に形成される第4雄ねじラウンド面とを含み、
前記雌ねじはさらに、
前記雌ねじ山面と前記雌ねじロード面との間の角に形成される第2雌ねじラウンド面と、
前記雌ねじ底面と前記雌ねじスタビング面との間の角に形成される第3雌ねじラウンド面と、
前記雌ねじ底面と前記雌ねじロード面との間の角に形成される第4雌ねじラウンド面とを含む、ねじ継手。 - 請求項1~3のいずれか1項に記載のねじ継手であって、
前記雄ねじロード面は、-10~3度のロード角を有し、
前記雌ねじロード面は、前記雄ねじロード面のロード角と同じロード角を有する、ねじ継手。 - 請求項1~4のいずれか1項に記載のねじ継手であって、
前記雄ねじ山面、前記雄ねじ底面、前記雌ねじ山面、及び前記雌ねじ底面は、前記管軸と平行に形成される、ねじ継手。 - 請求項1~5のいずれか1項に記載のねじ継手であって、
前記雄ねじスタビング面及び前記雌ねじスタビング面は、締結状態でそれらの間に60~120μmの隙間を有する、ねじ継手。 - 請求項1~6のいずれか1項に記載のねじ継手であって、
前記雄ねじ山面及び前記雌ねじ底面は、締結状態でそれらの間に0~50μmの隙間を有し、かつ、前記雄ねじ底面及び前記雌ねじ山面は、締結状態でそれらの間に0~50μmの隙間を有する、ねじ継手。 - 請求項1~7のいずれか1項に記載のねじ継手であって、
前記ピンはさらに、前記ピンの先端部に形成されるピンショルダ面を含み、
前記ボックスはさらに、締結状態で前記ピンショルダ面と接触するボックスショルダ面を含む、ねじ継手。 - 請求項1~8のいずれか1項に記載のねじ継手であって、
前記雄ねじは、前記ピンの先端から遠ざかるにつれて小さくなるテーパ比を有するテーパねじを含む、ねじ継手。 - 請求項1~9のいずれか1項に記載のねじ継手であって、
前記ピンはさらに、前記ピンの先端と前記雄ねじとの間であって前記ピンの外周に形成されるピンシール面を含み、
前記ボックスはさらに、前記ピンシール面と対向し、前記ボックスの内周に形成され、締結状態で前記ピンシール面と密着するボックスシール面を含む、ねじ継手。 - 請求項1~10のいずれか1項に記載のねじ継手であって、
前記ねじシールを構成する前記雄ねじ及び前記雌ねじの一部は、管軸方向において、前記鋼管の肉厚の3倍以上の長さを有する、ねじ継手。 - 請求項1~11のいずれか1項に記載のねじ継手であって、
前記鋼管は、16インチを超える外径を有する、ねじ継手。 - 請求項1~11のいずれか1項に記載のねじ継手であって、
前記鋼管は、16インチ以下の外径を有する、ねじ継手。 - 2本の鋼管を互いに接続するためのねじ継手であって、
前記鋼管の一方の先端部に形成される管状の第1ピンと、
前記鋼管の他方の先端部に形成される管状の第2ピンと、
前記第1ピンが挿入されて前記第1ピンと締結される管状の第1ボックスと、前記第1ボックスの反対側に形成され、前記第2ピンが挿入されて前記第2ピンと締結される管状の第2ボックスとを含むカップリングとを備え、
前記第1及び第2ピンの各々は、前記ピンの外周に形成される雄ねじを含み、
前記第1及び第2ボックスの各々は、前記雄ねじに対応し、前記ボックスの内周に形成される雌ねじを含み、
前記雄ねじ及び前記雌ねじは、台形ねじであり、かつ、テーパねじであり、
締結状態で前記雄ねじ及び前記雌ねじの少なくとも一部はねじシールを構成し、
前記雄ねじは、
雄ねじ山面と、
雄ねじ底面と、
前記ピンの先端に近い側に形成される雄ねじスタビング面と、
前記ピンの先端から遠い側に形成される雄ねじロード面とを含み、
前記雄ねじスタビング面は、
前記鋼管の管軸から遠い側に形成され、-10~15度のスタビング角を有する第1雄ねじスタビング段と、
前記管軸に近い側に形成され、20~60度のスタビング角を有する第2雄ねじスタビング段とを有し、
前記第2雄ねじスタビング段は、前記雄ねじの高さの20~60%の高さを有し、
前記雌ねじは、
前記雄ねじ底面と対向する雌ねじ山面と、
前記雄ねじ山面と対向する雌ねじ底面と、
前記雄ねじスタビング面と対向する雌ねじスタビング面と、
前記雄ねじロード面と対向する雌ねじロード面とを含み、
前記雌ねじスタビング面は、
前記管軸から遠い側に形成され、前記第1雄ねじスタビング段のスタビング角と同じスタビング角を有する第1雌ねじスタビング段と、
前記管軸に近い側に形成され、前記第2雄ねじスタビング段のスタビング角と同じスタビング角を有する第2雌ねじスタビング段とを有する、ねじ継手。 - 請求項14に記載のねじ継手であって、
前記第1ピンはさらに、前記第1ピンの先端に形成される第1ピンショルダ面を含み、
前記第2ピンはさらに、前記第2ピンの先端に形成され、締結状態で前記第1ピンショルダ面と接触する第2ピンショルダ面を含む、ねじ継手。
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
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MX2019010415A MX2019010415A (es) | 2017-03-31 | 2018-03-02 | Conexion roscada para tubo de acero. |
BR112019017165-7A BR112019017165B1 (pt) | 2017-03-31 | 2018-03-02 | Conexão roscada para tubo de aço |
EA201992035A EA038092B1 (ru) | 2017-03-31 | 2018-03-02 | Резьбовое соединение для стальной трубы |
US16/495,420 US11067205B2 (en) | 2017-03-31 | 2018-03-02 | Threaded connection for steel pipe |
UAA201910009A UA124780C2 (uk) | 2017-03-31 | 2018-03-02 | Нарізне з'єднання для сталевої труби |
MYPI2019005065A MY201522A (en) | 2017-03-31 | 2018-03-02 | Threaded connection for steel pipe |
JP2019509070A JP6795084B2 (ja) | 2017-03-31 | 2018-03-02 | 鋼管用ねじ継手 |
PL18774281.2T PL3604881T3 (pl) | 2017-03-31 | 2018-03-02 | Połączenie gwintowe dla rur stalowych |
EP18774281.2A EP3604881B1 (en) | 2017-03-31 | 2018-03-02 | Threaded connection for steel pipe |
CA3055505A CA3055505C (en) | 2017-03-31 | 2018-03-02 | Threaded connection for steel pipe |
AU2018246094A AU2018246094B2 (en) | 2017-03-31 | 2018-03-02 | Threaded connection for steel pipe |
CN201880022821.1A CN110476000B (zh) | 2017-03-31 | 2018-03-02 | 钢管用螺纹接头 |
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AR (1) | AR111444A1 (ja) |
AU (1) | AU2018246094B2 (ja) |
BR (1) | BR112019017165B1 (ja) |
CA (1) | CA3055505C (ja) |
EA (1) | EA038092B1 (ja) |
MX (1) | MX2019010415A (ja) |
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WO2020195621A1 (ja) | 2019-03-27 | 2020-10-01 | 日本製鉄株式会社 | 鋼管用ねじ継手 |
WO2021140755A1 (ja) * | 2020-01-06 | 2021-07-15 | 日本製鉄株式会社 | 鋼管ねじ継手 |
US11396962B2 (en) * | 2019-06-06 | 2022-07-26 | Fermata Technologies, Llc | Arcuate thread form fit |
US11614186B1 (en) | 2020-03-25 | 2023-03-28 | PTC Liberty Tubulars LLC | Box connection for a pin with relieved thread region |
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- 2018-03-02 US US16/495,420 patent/US11067205B2/en active Active
- 2018-03-02 AU AU2018246094A patent/AU2018246094B2/en active Active
- 2018-03-02 PL PL18774281.2T patent/PL3604881T3/pl unknown
- 2018-03-02 CN CN201880022821.1A patent/CN110476000B/zh active Active
- 2018-03-02 EA EA201992035A patent/EA038092B1/ru unknown
- 2018-03-02 EP EP18774281.2A patent/EP3604881B1/en active Active
- 2018-03-02 MX MX2019010415A patent/MX2019010415A/es unknown
- 2018-03-02 UA UAA201910009A patent/UA124780C2/uk unknown
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- 2018-03-02 WO PCT/JP2018/008155 patent/WO2018180218A1/ja active Application Filing
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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AU2020247986B2 (en) * | 2019-03-27 | 2023-02-16 | Nippon Steel Corporation | Threaded connection for steel pipe |
CN113396300A (zh) * | 2019-03-27 | 2021-09-14 | 日本制铁株式会社 | 钢管用螺纹接头 |
JPWO2020195621A1 (ja) * | 2019-03-27 | 2021-10-14 | 日本製鉄株式会社 | 鋼管用ねじ継手 |
EP3951229A4 (en) * | 2019-03-27 | 2022-07-06 | Nippon Steel Corporation | THREADED FITTING FOR STEEL PIPE |
JP7173295B2 (ja) | 2019-03-27 | 2022-11-16 | 日本製鉄株式会社 | 鋼管用ねじ継手 |
EP4108969A1 (en) | 2019-03-27 | 2022-12-28 | Nippon Steel Corporation | Threaded coupling for steel pipe |
WO2020195621A1 (ja) | 2019-03-27 | 2020-10-01 | 日本製鉄株式会社 | 鋼管用ねじ継手 |
US11703163B2 (en) | 2019-03-27 | 2023-07-18 | Nippon Steel Corporation | Threaded connection for steel pipe |
JP7421146B2 (ja) | 2019-03-27 | 2024-01-24 | 日本製鉄株式会社 | 鋼管用ねじ継手 |
US11396962B2 (en) * | 2019-06-06 | 2022-07-26 | Fermata Technologies, Llc | Arcuate thread form fit |
WO2021140755A1 (ja) * | 2020-01-06 | 2021-07-15 | 日本製鉄株式会社 | 鋼管ねじ継手 |
JP6930683B1 (ja) * | 2020-01-06 | 2021-09-01 | 日本製鉄株式会社 | 鋼管ねじ継手構造 |
US11614186B1 (en) | 2020-03-25 | 2023-03-28 | PTC Liberty Tubulars LLC | Box connection for a pin with relieved thread region |
Also Published As
Publication number | Publication date |
---|---|
UA124780C2 (uk) | 2021-11-17 |
US11067205B2 (en) | 2021-07-20 |
US20200025315A1 (en) | 2020-01-23 |
JPWO2018180218A1 (ja) | 2019-06-27 |
AU2018246094B2 (en) | 2021-02-04 |
CA3055505C (en) | 2021-12-14 |
EA038092B1 (ru) | 2021-07-05 |
AU2018246094A1 (en) | 2019-09-12 |
MY201522A (en) | 2024-02-27 |
MX2019010415A (es) | 2019-10-15 |
CA3055505A1 (en) | 2018-10-04 |
CN110476000A (zh) | 2019-11-19 |
BR112019017165B1 (pt) | 2023-01-24 |
AR111444A1 (es) | 2019-07-17 |
PL3604881T3 (pl) | 2022-08-22 |
EP3604881A4 (en) | 2020-04-15 |
EP3604881B1 (en) | 2022-05-04 |
CN110476000B (zh) | 2021-08-24 |
EP3604881A1 (en) | 2020-02-05 |
BR112019017165A2 (pt) | 2020-04-14 |
EA201992035A1 (ru) | 2020-02-28 |
JP6795084B2 (ja) | 2020-12-02 |
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