WO2014115191A1 - 鋼管用ねじ継手 - Google Patents
鋼管用ねじ継手 Download PDFInfo
- Publication number
- WO2014115191A1 WO2014115191A1 PCT/JP2013/000436 JP2013000436W WO2014115191A1 WO 2014115191 A1 WO2014115191 A1 WO 2014115191A1 JP 2013000436 W JP2013000436 W JP 2013000436W WO 2014115191 A1 WO2014115191 A1 WO 2014115191A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pin
- nose
- box
- seal
- outer peripheral
- Prior art date
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 6
- 238000010168 coupling process Methods 0.000 title claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 title description 13
- 239000010959 steel Substances 0.000 title description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 description 5
- 239000003129 oil well Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- F16L2201/00—Special arrangements for pipe couplings
- F16L2201/40—Special arrangements for pipe couplings for special environments
Definitions
- the present invention relates to a threaded joint for steel pipes, and in particular, oil well pipes including tubing and casings generally used for exploration and production of oil wells and gas wells, that is, OCTG (oil country tubular goods), riser pipes, line pipes, etc.
- the present invention relates to a threaded joint for steel pipes that is suitable for use in connecting steel pipes and has excellent sealing properties and compression resistance.
- Threaded joints are widely used to connect steel pipes used in oil industry equipment such as oil well pipes.
- API American Petroleum Institute
- a standard threaded joint specified in the API (American Petroleum Institute) standard has been typically used for connecting steel pipes used for oil and gas exploration and production.
- the wells for crude oil and natural gas have been deepened, and the number of vertical wells, horizontal wells, inclined wells, etc. has increased, and the drilling and production environment has become severe.
- screw joints such as compression resistance, bending resistance, and external pressure seal performance (external pressure resistance) has diversified due to the increased development of wells in poor environments such as the ocean and polar regions. ing. For this reason, the use of high-performance special threaded joints called premium joints is increasing, and the demands on the performance are also increasing.
- a premium joint usually has a male screw member (hereinafter referred to as a pin) formed on a pipe end portion, each having a taper screw, a seal portion (specifically, a metal touch seal portion), and a shoulder portion (specifically, a torque shoulder portion).
- a coupling type joint in which a female screw member (hereinafter referred to as a box) for connecting pins to each other is coupled.
- the taper screw is important for firmly fixing the pipe joint, and the seal part plays a role of securing the sealing performance by metal contact between the box and the pin at this part, and the shoulder part is a stopper of the joint during tightening. It becomes the shoulder side that plays the role.
- FIG. 3 is a schematic vertical sectional view of a threaded joint of a circular pipe as an explanatory diagram of a premium joint for oil well pipes, (a) is an overall view, (b) is an enlarged view showing a threaded portion in (a), c) is an enlarged view showing the vicinity of the pin nose in (a).
- the threaded joint includes a pin 3 and a box 1 corresponding to the pin 3, and the pin 3 has a male screw portion 7 on the outer surface thereof and a screwless portion provided adjacent to the male screw portion 7 on the distal end side of the pin 3. It has a nose portion 8 (pin nose 8) which is a length portion.
- the nose portion 8 has a seal portion 11 on its outer peripheral surface and a torque shoulder portion 12 on its end surface.
- the opposing box 1 has a female screw part 5, a seal part 13, a part that can be screwed or contacted with the male screw part 7, the seal part 11, and the shoulder part 12 of the pin 3 on the inner surface thereof, respectively.
- a shoulder portion 14 is provided. *
- Patent Document 1 discloses a radial seal type in which a nose portion on a pin tip side is in metal-metal contact with a box inner surface in a radial direction and the contact portion becomes a seal portion.
- a pin nose portion having discontinuity with the seal portion is provided between the seal portion and the shoulder portion, A method is disclosed in which this part is not in contact with the box. In this method, by providing the seal portion at a location away from the tip of the pin, high airtightness can be obtained even when the pin is relatively thin.
- Patent Document 1 has a problem in that the discontinuity with the seal portion is imparted to the pin nose portion, so that the shape becomes complicated and the processing efficiency is sacrificed.
- the present invention was made by obtaining the knowledge that a screw joint having a simple pin nose shape but having high airtightness even in an external pressure environment can be obtained. That is, the present invention is as follows. (1) A male screw portion, a pin having a nose portion extending from the male screw portion toward the tube end side, and a shoulder portion provided at the tip of the nose portion, and a screw portion coupled to the male screw portion to form a screw portion.
- a box having a female screw part, a seal surface facing the outer peripheral surface of the nose part of the pin, and a shoulder part contacting the shoulder part of the pin, and the pin and the box are coupled by the screw coupling.
- the outer peripheral surface of the nose part and the seal surface of the box are metal-metal contact, and the contact part is a threaded joint for a steel pipe, and the outer peripheral surface of the nose part of the pin has a single taper shape, a convex curved sealing surface on the outside of the box, a threaded joint for steel pipes sealing point x p defined by the following formula and wherein not less than 0.2 inches.
- FIG. 1 is a schematic longitudinal sectional view showing an example of an embodiment of the present invention.
- FIG. 2 is a schematic longitudinal sectional view showing an example of the embodiment of the present invention.
- FIG. 3 is a schematic longitudinal sectional view showing a conventional threaded joint for steel pipes.
- the threaded joint for steel pipes is provided with a male screw part 7, a nose part 8 extending from the male screw part 7 to the pipe end side, and a tip of the nose part 8.
- a pin 3 having a shoulder portion 12 formed therein, a female screw portion 5 screwed to the male screw portion 7 to form a screw portion, a seal surface 21 facing the outer peripheral surface of the nose portion of the pin 3, and the pin 3
- a box 1 having a shoulder portion 14 abutting against the shoulder portion 12, and the pin 3 and the box 1 are coupled by the screw coupling so that the outer peripheral surface of the nose portion of the pin 3 and the seal surface 21 of the box 1 are It was assumed that this was a steel pipe threaded joint with metal-metal contact and the contact part forming the seal part 20 (a threaded joint equivalent to a conventional radial seal type premium joint).
- FIG. 1 also shows a schematic distribution diagram of p with respect to x.
- the pin nose base gap 41 which is a gap that exists from the boundary of the seal portion 20 to the screw portion side to the tip of the screw portion, communicates with the outside through a screw gap that is a gap that exists in the screwed screw portion.
- an external pressure acts in the pin nose base clearance 41, and the external pressure 31 receives a pressing force by the external pressure.
- x p is less than 0.2 inch, the pin 3 resists the pressing force.
- the pin outer diameter is significantly reduced and the pin nose outer peripheral surface 31 and the seal surface 21 are in poor contact with each other, and airtightness cannot be secured.
- x p is preferably not more than about 1.0 inches.
- the seal point x p, x 1, x 2 lower limit as the upper limit of the range of integration, so that the same size longitudinal sectional view of the pin 3 and the box 1 are the tubes axes and shoulder faces coincide with each other X-coordinates and identifications of the two intersections of the pin nose outer peripheral surface 31 and the seal surface 21 (the two intersection points correspond to the pin tip end point and the screw end point of the seal part 20), respectively, when they are superimposed Is done.
- the x-axis is parallel to the tube axis direction, and the tip of the pin nose is the origin. That is, x is the distance in the tube axis direction from the tip of the pin nose.
- the contact surface pressure p is obtained as a function of x from FEA calculation simulating LP2 in the ISO 13679 series A test.
- the element size is assumed to be 0.001 to 0.01 inch, and the box and the pin are assumed to be elastic-plastic.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
Description
すなわち本発明は次のとおりである。
(1) 雄ねじ部と、該雄ねじ部より管端側に延在するノーズ部と、該ノーズ部の先端に設けられたショルダ部とを有するピンと、前記雄ねじ部とねじ結合されてねじ部をなす雌ねじ部と、前記ピンのノーズ部外周面に相対するシール面と、前記ピンのショルダ部に当接するショルダ部とを有するボックスとを有し、前記ねじ結合により前記ピンとボックスとが結合されてピンの前記ノーズ部外周面とボックスの前記シール面とがメタル‐メタル接触しその接触部がシール部をなす鋼管用ねじ継手であって、ピンのノーズ部外周面が単一のテーパ形状であり、ボックスのシール面が外側に凸の曲面形状であり、下記式で定義されるシールポイントxpが0.2インチ以上であることを特徴とする鋼管用ねじ継手。
シールポイントxpの計算において、積分範囲の下限、上限であるx1,x2は、ピン3とボックス1の同寸縦断面図をそれらの管軸同士及びショルダ面同士が互いに一致するように重ね合わせたときの、ピンノーズ外周面31とシール面21との二交点(これら二交点はそれぞれ、シール部20のピン先端側の端点とねじ側の端点とに対応する)の各x座標と同定される。ここでx軸は管軸方向に平行であり、ピンノーズ先端を原点とする。つまり、xはピンノーズ先端からの管軸方向の距離である。又、接触面圧pは、ISO13679のシリーズAテストにおけるLP2を模擬したFEA計算から、xの関数として求められる。ここで、同FEA計算では、要素サイズは0.001~0.01インチとされ、ボックスおよびピンは弾塑性体であると仮定される。
3 ピン
5 雌ねじ部
7 雄ねじ部
8 ノーズ部(ピンノーズ)
11,13,20 シール部(詳しくはメタルタッチシール部)
12,14 ショルダ部(詳しくはトルクショルダ部)
21 シール面
31 ピンノーズ外周面(ピンのノーズ部外周面)
41 ピンノーズ基部隙間
Claims (1)
- 雄ねじ部と、該雄ねじ部より管端側に延在するノーズ部と、該ノーズ部の先端に設けられたショルダ部とを有するピンと、前記雄ねじ部とねじ結合されてねじ部をなす雌ねじ部と、前記ピンのノーズ部外周面に相対するシール面と、前記ピンのショルダ部に当接するショルダ部とを有するボックスとを有し、前記ねじ結合により前記ピンとボックスとが結合されてピンの前記ノーズ部外周面とボックスの前記シール面とがメタル‐メタル接触しその接触部がシール部をなす鋼管用ねじ継手であって、ピンのノーズ部外周面が単一のテーパ形状であり、ボックスのシール面が外側に凸の曲面形状であり、下記式で定義されるシールポイントxpが0.2インチ以上であることを特徴とする鋼管用ねじ継手。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/000436 WO2014115191A1 (ja) | 2013-01-28 | 2013-01-28 | 鋼管用ねじ継手 |
EP13872310.1A EP2949983A4 (en) | 2013-01-28 | 2013-01-28 | SCREW COUPLING FOR STEEL PIPE |
US14/763,229 US10202809B2 (en) | 2013-01-28 | 2013-01-28 | Threaded joint for steel pipes |
BR112015017303-9A BR112015017303B1 (pt) | 2013-01-28 | 2013-01-28 | acoplamento de parafuso para tubos de aço |
MX2015009511A MX367486B (es) | 2013-01-28 | 2013-01-28 | Junta roscada para tuberias de acero. |
JP2014558280A JP5949953B2 (ja) | 2013-01-28 | 2013-01-28 | 鋼管用ねじ継手 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/000436 WO2014115191A1 (ja) | 2013-01-28 | 2013-01-28 | 鋼管用ねじ継手 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014115191A1 true WO2014115191A1 (ja) | 2014-07-31 |
Family
ID=51227012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/000436 WO2014115191A1 (ja) | 2013-01-28 | 2013-01-28 | 鋼管用ねじ継手 |
Country Status (6)
Country | Link |
---|---|
US (1) | US10202809B2 (ja) |
EP (1) | EP2949983A4 (ja) |
JP (1) | JP5949953B2 (ja) |
BR (1) | BR112015017303B1 (ja) |
MX (1) | MX367486B (ja) |
WO (1) | WO2014115191A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005351324A (ja) * | 2004-06-09 | 2005-12-22 | Metal One Corp | 油井管用ネジ継手 |
JP4535064B2 (ja) | 2003-06-06 | 2010-09-01 | 住友金属工業株式会社 | 鋼管用ねじ継手 |
WO2012002409A1 (ja) * | 2010-06-30 | 2012-01-05 | Jfeスチール株式会社 | 管用ねじ継手 |
WO2012118167A1 (ja) * | 2011-02-28 | 2012-09-07 | Jfeスチール株式会社 | 管用ねじ継手 |
JP2012180858A (ja) * | 2011-02-28 | 2012-09-20 | Jfe Steel Corp | 鋼管用ねじ継手 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69532400T2 (de) * | 1994-10-19 | 2004-11-11 | Vallourec Mannesmann Oil & Gas France | Gewindeverbindung für Rohre |
EP0916883B1 (en) * | 1997-05-30 | 2006-06-28 | Sumitomo Metal Industries, Ltd. | Screw joint for oil well pipe |
DE19955377C2 (de) * | 1999-11-10 | 2002-05-02 | Mannesmann Ag | Rohrverbindung |
GB0227603D0 (en) * | 2002-11-27 | 2002-12-31 | Hsc S A L | Improved casino joints |
GB201005247D0 (en) * | 2010-03-29 | 2010-05-12 | Hsc Fzco | An improved seal between pipes |
WO2012056500A1 (ja) | 2010-10-29 | 2012-05-03 | 株式会社メタルワン | 油井管用ネジ継ぎ手 |
GB201019413D0 (en) * | 2010-11-17 | 2010-12-29 | Hsc Fzco | An improved seal between pipes |
US8894101B2 (en) * | 2012-09-07 | 2014-11-25 | Vetco Gray Inc. | Protected integral metal to metal seal |
-
2013
- 2013-01-28 MX MX2015009511A patent/MX367486B/es active IP Right Grant
- 2013-01-28 US US14/763,229 patent/US10202809B2/en not_active Expired - Fee Related
- 2013-01-28 JP JP2014558280A patent/JP5949953B2/ja active Active
- 2013-01-28 BR BR112015017303-9A patent/BR112015017303B1/pt not_active IP Right Cessation
- 2013-01-28 WO PCT/JP2013/000436 patent/WO2014115191A1/ja active Application Filing
- 2013-01-28 EP EP13872310.1A patent/EP2949983A4/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4535064B2 (ja) | 2003-06-06 | 2010-09-01 | 住友金属工業株式会社 | 鋼管用ねじ継手 |
JP2005351324A (ja) * | 2004-06-09 | 2005-12-22 | Metal One Corp | 油井管用ネジ継手 |
WO2012002409A1 (ja) * | 2010-06-30 | 2012-01-05 | Jfeスチール株式会社 | 管用ねじ継手 |
WO2012118167A1 (ja) * | 2011-02-28 | 2012-09-07 | Jfeスチール株式会社 | 管用ねじ継手 |
JP2012180858A (ja) * | 2011-02-28 | 2012-09-20 | Jfe Steel Corp | 鋼管用ねじ継手 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2949983A4 * |
Also Published As
Publication number | Publication date |
---|---|
MX367486B (es) | 2019-08-23 |
US10202809B2 (en) | 2019-02-12 |
JP5949953B2 (ja) | 2016-07-13 |
MX2015009511A (es) | 2015-11-16 |
JPWO2014115191A1 (ja) | 2017-01-19 |
BR112015017303B1 (pt) | 2021-01-19 |
EP2949983A4 (en) | 2016-04-06 |
US20150368987A1 (en) | 2015-12-24 |
EP2949983A1 (en) | 2015-12-02 |
BR112015017303A2 (pt) | 2017-07-11 |
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