JP2001065752A - Screw joint for oil well pipe and lublication film forming method therefor - Google Patents
Screw joint for oil well pipe and lublication film forming method thereforInfo
- Publication number
- JP2001065752A JP2001065752A JP24189099A JP24189099A JP2001065752A JP 2001065752 A JP2001065752 A JP 2001065752A JP 24189099 A JP24189099 A JP 24189099A JP 24189099 A JP24189099 A JP 24189099A JP 2001065752 A JP2001065752 A JP 2001065752A
- Authority
- JP
- Japan
- Prior art keywords
- pin
- box
- molybdenum disulfide
- threaded joint
- graphite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Chemically Coating (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、耐焼付き性に優れ
た油井管用ねじ継手に関し、更に詳しくは高深度、高温
油井あるいは蒸気注入油井等の高温環境下の原油採掘に
おいて繰り返しの締め付け・緩め戻しを行っても焼き付
くことなく、かつ気密性が保たれ、繰り返し使用できる
油井管用ねじ継手とその潤滑被膜形成方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threaded joint for oil country tubular goods having excellent seizure resistance, and more particularly, to repeated tightening and loosening in crude oil extraction in a high-temperature environment such as a high-depth, high-temperature oil well or a steam injection oil well. The present invention relates to a threaded joint for oil country tubular goods which can be used repeatedly without seizure and keeping airtightness even after performing the method, and a method of forming a lubricating film therefor.
【0002】[0002]
【従来の技術】通常、油井の深さは2000m〜300
0mであるが、近年の海洋油田などの深油井では800
0m〜10000mにも達する。このような油井に竪て
込まれるチュービングやケーシングなどの油井管の連結
には、一般的にねじ継手が用いられる。すなわち、油井
管外面に形成した雄ねじとねじ継手内面に形成した雌ね
じをはめ合わせ、締め付けることにより連結がおこなわ
れる。2. Description of the Related Art Normally, the depth of an oil well is 2000 m to 300 m.
0 m, but 800 m in deep oil wells such as recent marine oil fields.
It reaches from 0m to 10000m. Generally, a threaded joint is used for connecting oil well pipes such as tubing and a casing that are laid vertically in such an oil well. That is, the male screw formed on the outer surface of the oil country tubular good and the female screw formed on the inner surface of the threaded joint are fitted and tightened to perform the connection.
【0003】ねじ継手には使用環境下で軸方向の引張力
や内外面圧力などの複合した圧力や熱が作用するため、
このような環境下においてもねじ継手の気密性が維持さ
れること、ねじ継手が破損しないことが要求される。一
方、チュービングやケーシングの降下作業時には、一度
締め込んだ継手を緩め、再度締め直すことがあり、AP
I(米国石油協会)ではチュービングで10回、ケーシ
ングで3回の締め付け(メイクアップ)−締め戻し(ブ
レークアウト)を行ってもゴーリングと呼ばれる焼き付
きの発生がなく、気密性が維持されることが要求されて
いる。ゴーリングが発生すると、気密性が不完全とな
り、繰り返し使用回数が低下する。[0003] Since complex pressure and heat such as axial tensile force and internal / external surface pressure act on the threaded joint in the use environment,
Even under such an environment, it is required that the airtightness of the threaded joint is maintained and that the threaded joint is not damaged. On the other hand, when lowering the tubing or casing, the joint once tightened may be loosened and re-tightened.
In I (American Petroleum Institute), even if tubing is tightened 10 times (make-up) and casing is tightened 3 times (break-out), there is no seizure called galling and airtightness is maintained. Has been requested. When galling occurs, the airtightness becomes incomplete and the number of times of repeated use decreases.
【0004】ところで、ねじ継手としては、通常、油井
管の端部に形成した雄ねじの先端にねじ無し金属接触部
を形成し、これと、ねじ継手の内面の雌ねじの基部に形
成したねじ無し金属接触部とをはめ合わせ、締め付ける
ことによりねじ無し金属接触部同士を当接してメタルシ
ール部を形成した構造のねじ継手が使用される。しか
し、メタルシール部およびねじ部には高面圧が作用する
ため、特に、高温条件下ではゴーリングが発生しやす
く、APIの規格には、継手締結後に177℃×24H
rの耐熱試験を実施した後、締め戻し−再度締め付けを
行っても気密性が保たれていることが要求されている。[0004] By the way, as a threaded joint, a threadless metal contact portion is usually formed at the tip of a male thread formed at the end of an oil country tubular good, and a threadless metal contact formed at the base of a female thread on the inner surface of the threaded joint. A threaded joint having a structure in which a metal seal portion is formed by abutting the screwless metal contact portions by fitting and tightening the contact portions. However, since high surface pressure acts on the metal seal portion and the threaded portion, galling is likely to occur particularly under high-temperature conditions. According to the API standard, 177 ° C. × 24H
After the heat resistance test of r is performed, it is required that airtightness be maintained even if retightening and retightening are performed.
【0005】そこで、上記要求に応じるため、従来より
種々の対策案が提示されている。例えば、特開平5−1
17870公報にはねじ継手の表面に平均粗さ20〜6
0μmの凹凸加工を施した後、燐酸塩系の化成処理被膜
を形成する方法が、また、特開平6−10154公報に
はメタルシール部の表面最大粗さと表面処理被膜層の厚
さを規定して表面処理する方法が、特開平5−1494
85公報にはピンまたはボックス表面に分散めっき層を
形成したねじ継手が、特開平2−885593公報には
表面粗さを20〜50μmにしたメタルシール部にセラ
ミックス塗装を施す方法が、特開平8−233164公
報や特開平9−72467公報にはボックスまたはピン
の接触表面に二硫化モリブデン粉末を分散混合した樹脂
被膜を形成したねじ継手が、それぞれ提示されている。In order to meet the above demand, various countermeasures have been proposed. For example, Japanese Patent Application Laid-Open No. 5-1
No. 17870 discloses an average roughness of 20 to 6 on the surface of a threaded joint.
A method of forming a phosphate-based chemical conversion coating film after forming an unevenness of 0 μm, and Japanese Unexamined Patent Publication (Kokai) No. 6-10154 specifies the maximum surface roughness of the metal seal portion and the thickness of the surface treatment coating layer. Japanese Patent Application Laid-Open No. 5-1494 / 1993
No. 85 discloses a threaded joint having a dispersed plating layer formed on the surface of a pin or a box, and Japanese Unexamined Patent Publication No. 2-885593 discloses a method of applying ceramic coating to a metal seal portion having a surface roughness of 20 to 50 μm. JP-A-233164 and JP-A-9-72467 each disclose a threaded joint in which a resin film in which molybdenum disulfide powder is dispersed and mixed is formed on a contact surface of a box or a pin.
【0006】[0006]
【発明が解決しようとする課題】近年、従来より高温の
250〜300℃の使用環境下で用いる高温油井用や、
原油回収効率を高めるため、臨界温度にも達する高温蒸
気(350℃)を注入する蒸気注入油井用の耐熱性継手
が要求されている。したがって、ねじ継手には、継手締
結後に350℃を越す温度で耐熱試験を実施した後、締
め戻し−再締結の処理を行っても気密性が保持される性
能が要求される。In recent years, for high-temperature oil wells used in an operating environment of 250 to 300 ° C.,
In order to increase the efficiency of crude oil recovery, a heat-resistant joint for a steam-injected oil well that injects high-temperature steam (350 ° C.) that reaches a critical temperature is required. Therefore, the threaded joint is required to have a performance of maintaining airtightness even after performing a heat-resisting test at a temperature exceeding 350 ° C. after the joint is fastened and then performing a tightening-refastening process.
【0007】しかしながら、上記公報などに開示された
従来の技術では、上記性能を確保することが難しい。即
ち、ねじ継手を締結する際に、APIの規格BUL5A
2に規定されるようなコンパウンドグリスを使用する場
合は、高温のためグリス成分が蒸発して潤滑性が低下す
るため、締め戻し時後の再締め付け時に所定の気密性が
得られないという問題がある。従って、コンパウンドグ
リス塗布を念頭に置いた特開平5−117870公報、
特開平6−10154公報、特開平5−149485公
報および特開平2−885593公報などに開示された
技術では高温時の気密性の確保に問題がある。[0007] However, it is difficult to secure the above performance with the conventional techniques disclosed in the above publications. That is, when fastening the threaded joint, API standard BUL5A
In the case of using compound grease as defined in 2, the grease component evaporates due to high temperature and the lubricity decreases, so that a problem that predetermined airtightness cannot be obtained when retightening after retightening is problematic. is there. Accordingly, Japanese Patent Application Laid-Open No. HEI 5-117870, which is directed to compound grease application,
The techniques disclosed in JP-A-6-10154, JP-A-5-149485 and JP-A-2-885593 have a problem in securing airtightness at high temperatures.
【0008】また、コンパウンドグリスを使用しないこ
とを特徴とする特開平8−233164公報や特開平9
−72467公報に開示された技術では、400℃にも
達する高温に長時間曝されると樹脂が変質するため、二
硫化モリブデンなどの固体潤滑剤を保持するバインダー
機能が喪失し、潤滑性が維持できなくなり、締付け不良
や焼付きが発生し、更には気密性が悪化するという問題
がある。Also, Japanese Patent Application Laid-Open Nos. 8-233164 and 9-29, wherein compound grease is not used.
According to the technology disclosed in Japanese Patent Application Laid-Open No. 72467/92, the resin deteriorates when exposed to a high temperature as high as 400 ° C. for a long time, so that the binder function of retaining a solid lubricant such as molybdenum disulfide is lost, and the lubricity is maintained. It cannot be performed any more, resulting in poor fastening and seizure, and further deteriorates airtightness.
【0009】以上のように、400℃にも達する高温環
境下で繰り返し使用できる耐ゴーリング性に優れたねじ
継手は得られていないのが現状である。As described above, at present, a threaded joint having excellent galling resistance which can be repeatedly used in a high temperature environment of as high as 400 ° C. has not been obtained.
【0010】本発明の課題は、耐ゴーリング性に優れた
油井管用ねじ継手を提供することにある。更に詳しくは
高深度、高温油井、あるいは蒸気注入油井等の高温環境
下の原油採掘において繰り返しの締め付け・緩め戻しに
対してゴーリングの発生を抑制し、気密性に優れた油井
管用ねじ継手とその潤滑被膜形成方法を提供することに
ある。An object of the present invention is to provide a threaded joint for oil country tubular goods having excellent galling resistance. More specifically, in oil drilling in high-temperature environments such as high-depth, high-temperature oil wells, or steam-injected oil wells, it suppresses galling from repeated tightening and loosening, and has excellent airtight threaded joints for oil country tubular goods and its lubrication. An object of the present invention is to provide a method for forming a film.
【0011】[0011]
【課題を解決するための手段】本発明者らは上記課題を
解決するため、高温環境下における耐ゴーリング性に優
れた潤滑被膜の形成に注視し、潤滑被膜を構成する固体
潤滑剤とバインダー(結合剤)の耐熱性、潤滑性ならび
に被膜処理性などに関して基礎的検討を行い、以下の知
見を得た。Means for Solving the Problems In order to solve the above problems, the present inventors have focused on the formation of a lubricating film having excellent galling resistance under a high temperature environment, and have studied a solid lubricant and a binder (lubricant) constituting the lubricating film. Fundamental studies were conducted on the heat resistance, lubricity and film processing properties of the binder), and the following findings were obtained.
【0012】(イ)二硫化モリブデンや黒鉛等の固体潤
滑剤は400℃程度の温度でも熱による変質・分解もな
く、常温と変わらない良好な潤滑性を示す。(A) Solid lubricants such as molybdenum disulfide and graphite do not deteriorate or decompose due to heat even at a temperature of about 400 ° C., and exhibit good lubricity that does not change from ordinary temperature.
【0013】(ロ)固体潤滑剤のバインダーとして樹脂
を用いると、24Hrを越える長時間の高温環境下では
変質、分解、あるいは炭化が進み、固体潤滑剤を継手表
面に被覆するバインダーとしての機能が失われ、潤滑性
が低下する。(B) When a resin is used as a binder for the solid lubricant, the resin deteriorates, decomposes, or carbonizes under a long-time high temperature environment of more than 24 hours, and the function as a binder for coating the joint lubricant on the joint surface is increased. It is lost and lubricity is reduced.
【0014】(ハ)Si、Ti、Al等の酸化物、炭化
物、窒化物等の無機化合物は、熱的に安定しているが、
固体潤滑剤を被覆するバインダーとしての機能が全くな
い。従って、被膜形成ができないため、固体潤滑剤を混
合しても潤滑性が低い。(C) Inorganic compounds such as oxides, carbides and nitrides such as Si, Ti and Al are thermally stable.
There is no function as a binder for coating the solid lubricant. Therefore, since a film cannot be formed, lubricity is low even when a solid lubricant is mixed.
【0015】(ニ)チタンアルコキシド(Ti(OR)
4 、R=アルキル基)はアルキル基を有するため、有機
物的な特性を示し、バインダーとしての機能がある。こ
の物質は大気中では不安定で、水分を吸収して共加水分
解が起こり、分解物はお互いに結合して網目構造を有し
たTi−Oを骨格とし熱的に安定な無機高分子化合物に
変化する。(1)式に代表的な無機高分子化合物の分子
構造式を例示する。(D) Titanium alkoxide (Ti (OR)
(4 , R = alkyl group) has an alkyl group, and thus exhibits organic properties and functions as a binder. This substance is unstable in the air, absorbs moisture and causes co-hydrolysis, and the decomposed products are bonded to each other to form a thermally stable inorganic polymer compound with a skeleton of Ti-O having a network structure. Change. Formula (1) illustrates a molecular structural formula of a typical inorganic polymer compound.
【0016】[0016]
【化1】 Embedded image
【0017】(ホ)上記無機高分子化合物は硬質であり
耐摩耗性に優れる。 (ヘ)従って、二硫化モリブデンや黒鉛などの固体潤滑
剤にバインダーとしてチタンアルコキシドを混合して塗
布し、加湿処理を施すことにより、二硫化モリブデンや
黒鉛を含有し、潤滑性と耐熱性に優れたTi−Oを骨格
とする無機高分子化合物の潤滑被膜を形成させることが
できる。(E) The above inorganic polymer compound is hard and has excellent wear resistance. (F) Therefore, by mixing and applying a titanium alkoxide as a binder to a solid lubricant such as molybdenum disulfide or graphite and performing a humidifying treatment, it contains molybdenum disulfide or graphite and has excellent lubricity and heat resistance. A lubricating coating of an inorganic polymer compound having a skeleton of Ti-O can be formed.
【0018】以上の基礎検討結果を基に上記潤滑被膜を
ねじ継手に形成するための適正条件を検討し、以下の知
見を得た。Based on the above basic study results, appropriate conditions for forming the lubricating coating on the threaded joint were examined, and the following findings were obtained.
【0019】(ト)ピンあるいはボックスの少なくとも
いずれか一方のねじ無し金属接触部に上記潤滑被膜を形
成することにより焼付きが抑制される。(G) Seizure is suppressed by forming the lubricating coating on the threadless metal contact portion of at least one of the pin and the box.
【0020】(チ)潤滑被膜を構成する固体潤滑剤は、
二硫化モリブデンまたは黒鉛の粉末、あるいは二硫化モ
リブデンと黒鉛の混合粉末で、無機高分子化合物の含有
量Aと固体潤滑剤の含有量Bとの重量比(B/A)は
0.3〜9の範囲とするとよい。(H) The solid lubricant constituting the lubricating coating is:
Molybdenum disulfide or graphite powder, or a mixed powder of molybdenum disulfide and graphite, wherein the weight ratio (B / A) of the content A of the inorganic polymer compound to the content B of the solid lubricant is 0.3 to 9 Should be within the range.
【0021】(リ)潤滑被膜を形成する部位の表面粗さ
はRmax で3〜15μmとし、潤滑被膜の膜厚は5〜3
0μmとすることにより耐焼付き性が向上する。(4) The surface roughness of the portion where the lubricating film is to be formed is 3 to 15 μm in Rmax, and the thickness of the lubricating film is 5 to 3 μm.
By setting it to 0 μm, seizure resistance is improved.
【0022】(ヌ)チタンアルコキシドと固体潤滑剤と
を混合して塗布した後、加湿と加熱の処理を施すことに
より共加水分解が促進されるので、潤滑被膜の形成時間
が短縮し、かつ加水分解物の揮発・排出が促進されて被
膜の密着性が強固となり、耐焼付き性が向上する。(Ii) After the titanium alkoxide and the solid lubricant are mixed and applied, co-hydrolysis is promoted by applying humidification and heating, so that the time for forming a lubricating film is reduced, and Volatilization and discharge of the decomposition product are promoted, the adhesion of the film becomes strong, and the seizure resistance is improved.
【0023】本発明は、上記の知見に基づき完成された
もので、その要旨は以下の通りである。 (1)ねじ部とねじ無し金属接触部とをそれぞれ有する
ピンとボックスとから構成されるねじ継手において、ボ
ックスとピンの少なくともいずれか一方のねじ無し金属
接触部に、二硫化モリブデンおよび/または黒鉛を分散
混合したTi−Oを骨格とする無機高分子化合物の潤滑
被膜を形成したことを特徴とする油井管用ねじ継手。The present invention has been completed based on the above findings, and the gist thereof is as follows. (1) In a threaded joint composed of a pin and a box each having a threaded portion and a threadless metal contact portion, molybdenum disulfide and / or graphite are applied to at least one of the threadless metal contact portion of the box and the pin. A threaded joint for an oil country tubular good, wherein a lubricating coating of an inorganic polymer compound having a skeleton of Ti-O dispersed and mixed is formed.
【0024】(2)上記無機高分子化合物の含有量
(A)と、二硫化モリブデンと黒鉛の合計の含有量
(B)との重量比(B/A)が0.3〜9.0であるこ
とを特徴とする上記(1)項に記載の油井管用ねじ継
手。(2) The weight ratio (B / A) of the content (A) of the inorganic polymer compound to the total content (B) of molybdenum disulfide and graphite is 0.3 to 9.0. The threaded joint for oil country tubular goods as described in the above item (1), wherein
【0025】(3)上記潤滑被膜を形成する部位の表面
粗さがRmaxで3〜15μmであることを特徴とする
上記(1)項または(2)項に記載の油井管用ねじ継
手。(3) The threaded joint for an oil country tubular good as described in the above item (1) or (2), wherein the surface roughness of the portion where the lubricating coating is formed is 3 to 15 μm in Rmax.
【0026】(4)上記潤滑被膜の膜厚が5〜30μm
であることを特徴とする上記(1)項ないし(3)項の
いずれかに記載の油井管用ねじ継手。(4) The lubricating film has a thickness of 5 to 30 μm.
The threaded joint for an oil country tubular good according to any one of the above items (1) to (3), wherein
【0027】(5)ねじ部とねじ無し金属接触部とをそ
れぞれ有するピンとボックスとから構成されるねじ継手
のボックスとピンの少なくともいずれか一方のねじ無し
金属接触部に、チタンアルコキシド(Ti(OR)4 、
R:アルキル基)と二硫化モリブデンおよび/または黒
鉛とを混合して塗布し、加湿処理を施して共加水分解さ
せて、Ti−Oを骨格とする無機高分子化合物の潤滑被
膜を形成することを特徴とする油井管用ねじ継手の潤滑
被膜形成方法。(5) Titanium alkoxide (Ti (OR) is applied to at least one of the unthreaded metal contact portions of the box and the pin of the threaded joint, which includes a pin and a box each having a threaded portion and a threadless metal contact portion. 4 )
R: an alkyl group) and molybdenum disulfide and / or graphite are mixed and applied, humidified and co-hydrolyzed to form a lubricating film of an inorganic polymer compound having a Ti-O skeleton. A method for forming a lubricating film on a threaded joint for oil country tubular goods, characterized by the following.
【0028】(6)上記潤滑被膜を形成するに際し、予
め潤滑被膜を形成する部位にブラスティング加工を施
し、該部位の表面粗さをRmaxで3〜15μmにする
ことを特徴とする上記(5)項に記載の油井管用ねじ継
手の潤滑被膜形成方法。(6) When forming the lubricating coating, a blasting process is performed in advance on a portion where the lubricating coating is to be formed, and the surface roughness of the portion is set to 3 to 15 μm in Rmax. The method for forming a lubricating coating of a threaded joint for oil country tubular goods according to the item (2).
【0029】[0029]
【発明の実施の形態】図1は本発明の油井管用ねじ継手
の構成を模式的に示す概要図である。符号1はボック
ス、2はピン、3はねじ部、4はねじ無し金属接触部、
5はショルダー部を示す。FIG. 1 is a schematic view schematically showing a configuration of a threaded joint for an oil country tubular good according to the present invention. Reference numeral 1 is a box, 2 is a pin, 3 is a screw portion, 4 is a metal contact portion without a screw,
5 indicates a shoulder portion.
【0030】図2は本発明に係る潤滑被膜の形成状況の
一例を示すピンのねじ無し金属接触部の断面拡大図であ
る。符号6は潤滑被膜、7は無機高分子化合物、8は固
体潤滑剤で、図1と同じ要素は同一の符号で示す。FIG. 2 is an enlarged cross-sectional view of a threadless metal contact portion of a pin showing an example of a state of forming a lubricating film according to the present invention. Reference numeral 6 denotes a lubricating film, 7 denotes an inorganic polymer compound, 8 denotes a solid lubricant, and the same elements as those in FIG. 1 are denoted by the same reference numerals.
【0031】図1に示すように、本発明の油井管用ねじ
継手(以下、ねじ継手ともいう)は、ねじ継手部材の内
面に形成されるねじ部3とねじ無し金属接触部4からな
るボックス1と、油井管端部の外面に形成されるねじ部
3とねじ無し金属接触部4からなるピン2とで構成され
る。更に、本発明のねじ継手においては、図2に示すよ
うに、ピン2のねじ無し金属接触部4の表面に固体潤滑
剤8を分散混合したTi−Oを骨格とする無機高分子化
合物7の潤滑被膜6を形成する。上記固体潤滑剤は二硫
化モリブデンまたは黒鉛を単独で、あるいは二硫化モリ
ブデンと黒鉛とを混合して用いる。なお、図2は、ピン
2のねじ無し金属接触部4に潤滑被膜を形成する場合を
示したが、少なくともピンとボックスのいずれか一方の
ねじ無し金属接触部の表面に形成すればよい。As shown in FIG. 1, a threaded joint for an oil country tubular good (hereinafter also referred to as a threaded joint) according to the present invention is a box 1 comprising a threaded portion 3 formed on the inner surface of a threaded joint member and a threadless metal contact portion 4. And a pin 2 comprising a screw portion 3 and a screwless metal contact portion 4 formed on the outer surface of the end of the oil country tubular good. Further, in the threaded joint of the present invention, as shown in FIG. 2, the inorganic polymer compound 7 having a skeleton of Ti—O in which a solid lubricant 8 is dispersed and mixed on the surface of the threadless metal contact portion 4 of the pin 2 is used. A lubricating film 6 is formed. As the solid lubricant, molybdenum disulfide or graphite is used alone, or a mixture of molybdenum disulfide and graphite is used. Although FIG. 2 shows the case where the lubricating film is formed on the threadless metal contact portion 4 of the pin 2, it may be formed on at least the surface of either the pin or the box of the threadless metal contact portion.
【0032】ねじ無し金属接触部(以下、単に金属接触
部ともいう)はねじ部に比べ接触面圧が高く過酷な潤滑
状態にあり、また、ねじ継手はピンとボックスとを相互
にねじ込んで締結するため、少なくともピンとボックス
のいずれかの一方の金属接触部に潤滑被膜を形成するこ
とにより耐焼付き性を向上させることができる。なお、
材料強度が高く、ねじ部にも高い接触面圧が作用するね
じ継手やCrやNi等の合金元素量が多い合金製のねじ
継手では、焼付きが発生しやすくなるため、金属接触部
に加え更にねじ部にも潤滑被膜を形成することが望まし
い。A screwless metal contact portion (hereinafter, also simply referred to as a metal contact portion) has a higher contact surface pressure than a screw portion and is in a severely lubricated state, and a screw joint fastens a pin and a box by screwing each other into each other. Therefore, by forming a lubricating coating on at least one of the metal contact portions of the pin and the box, seizure resistance can be improved. In addition,
With threaded joints that have high material strength and high contact surface pressure also acts on the threaded portion, and threaded joints made of alloys with a large amount of alloying elements such as Cr and Ni, seizure is likely to occur. Further, it is desirable to form a lubricating film on the screw portion.
【0033】二硫化モリブデンおよび黒鉛はいずれも締
め付け作業の際の締め付け圧力で薄く伸ばされるため、
潤滑被膜の潤滑性を高め、耐焼き付き性を向上させる作
用がある。なお、二硫化モリブデンは黒鉛に比べ特に高
面圧下において潤滑性が高いので、材料強度の高いねじ
継手には二硫化モリブデンを単独で用いるのが望まし
い。Since both molybdenum disulfide and graphite are thinly stretched by the tightening pressure during the tightening operation,
It has the effect of improving the lubricity of the lubricating coating and improving the seizure resistance. Since molybdenum disulfide has higher lubricity than graphite, especially under a high surface pressure, it is desirable to use molybdenum disulfide alone for a threaded joint having high material strength.
【0034】Ti−Oを骨格とする無機高分子化合物
(以下、単に無機高分子化合物ともいう)は、前記
(1)式に例示する分子構造を備えており、二硫化モリ
ブデンや黒鉛などの固体潤滑剤のバインダーとしての機
能を有し潤滑被膜を形成する。例えば、無機高分子化合
物として、(1)式のアルキル基(R)がメチル、エチ
ル、イソプロピル、プロピル、イソブチル、ブチルなど
のアルキル基を備えたチタン化合物を挙げることができ
る。The inorganic high molecular compound having a skeleton of Ti—O (hereinafter also simply referred to as “inorganic high molecular compound”) has a molecular structure exemplified in the above formula (1), and is a solid such as molybdenum disulfide or graphite. It functions as a lubricant binder and forms a lubricating film. For example, as the inorganic polymer compound, a titanium compound in which the alkyl group (R) of the formula (1) has an alkyl group such as methyl, ethyl, isopropyl, propyl, isobutyl, and butyl can be used.
【0035】無機高分子化合物の含有量(A)と、二硫
化モリブデンと黒鉛の合計の含有量(B)との重量比
(B/A)は0.3以上、9.0以下とするのが望まし
い。重量比が0.3未満では形成される潤滑被膜の潤滑
性向上の効果が少なく、耐焼き付き性の改善が不十分で
あり、また、重量比が9.0より大きくなると、潤滑被
膜の密着性が低下し、特に潤滑被膜からの固体潤滑剤の
剥離が著しいなどの問題が生じる。より好ましくは、重
量比は0.5以上、7.0以下であり、更に好ましくは
3.0以上、6.5以下である。The weight ratio (B / A) of the content (A) of the inorganic high molecular compound to the total content (B) of molybdenum disulfide and graphite should be 0.3 or more and 9.0 or less. Is desirable. If the weight ratio is less than 0.3, the effect of improving the lubricity of the formed lubricating coating is small, and the improvement in seizure resistance is insufficient. If the weight ratio is more than 9.0, the adhesion of the lubricating coating is improved. And, in particular, a problem such as remarkable separation of the solid lubricant from the lubricating coating occurs. More preferably, the weight ratio is 0.5 or more and 7.0 or less, and still more preferably 3.0 or more and 6.5 or less.
【0036】潤滑被膜の厚さは5μm以上、30μm以
下とすることが望ましい。潤滑被膜の厚さが5μm未満
では潤滑性向上の効果が少なく、一方、30μmより大
きくなると潤滑被膜形成の処理コストが嵩むとともに潤
滑性向上の効果が飽和するため経済的に不利といった問
題や潤滑被膜が剥離しやすくなるといった欠点がある。
より好ましくは、潤滑被膜の膜厚は5μm以上、15μ
m以下であり、更に好ましくは6μm以上、10μm以
下である。It is desirable that the thickness of the lubricating coating be 5 μm or more and 30 μm or less. When the thickness of the lubricating film is less than 5 μm, the effect of improving the lubricity is small. On the other hand, when the thickness is more than 30 μm, the processing cost of forming the lubricating film increases and the effect of improving the lubricity is saturated. However, there is a drawback that it is easy to peel off.
More preferably, the thickness of the lubricating coating is 5 μm or more and 15 μm or more.
m, more preferably 6 μm or more and 10 μm or less.
【0037】上記潤滑被膜を形成する部位(下地)の表
面粗さはRmaxで3μm以上、15μm以下であるこ
とが望ましい。潤滑被膜を形成する際の下地処理として
適正な表面粗さを付与することにより、その上に形成さ
れる潤滑被膜を物理的に捕捉するいわゆるアンカー効果
が高まり、潤滑被膜の剥離が阻止される。表面粗さがR
max で3μm未満ではアンカー効果が小さく潤滑被膜が
剥離しやすい。一方、表面粗さが15μmを越えると締
め付け・締め戻し時に粗さの凸部に形成された潤滑被膜
が破れて焼き付きが発生しやすい。より好ましい表面粗
さは4μm以上、10μm以下である。なお、潤滑被膜
を形成しない相対する面の表面粗さは潤滑被膜を形成す
る部位の表面粗さ未満にするのがよい。It is desirable that the surface roughness (Rmax) of the portion (base) on which the lubricating film is formed be 3 μm or more and 15 μm or less. By providing an appropriate surface roughness as a base treatment when forming a lubricating film, the so-called anchor effect of physically capturing the lubricating film formed thereon is enhanced, and peeling of the lubricating film is prevented. Surface roughness is R
If max is less than 3 μm, the anchor effect is small and the lubricating coating tends to peel off. On the other hand, when the surface roughness exceeds 15 μm, the lubricating film formed on the convexity of the roughness at the time of tightening and retightening is broken, and seizure tends to occur. More preferable surface roughness is 4 μm or more and 10 μm or less. The surface roughness of the opposing surface on which the lubricating film is not formed is preferably smaller than the surface roughness of the portion on which the lubricating film is formed.
【0038】本発明のねじ継手は、従来、メークアップ
前に塗布していたコンパウンドグリスなどの潤滑剤を一
切使用することなく耐ゴーリング性を著しく改善するこ
とができる。The threaded joint of the present invention can remarkably improve the galling resistance without using any lubricant such as compound grease applied before make-up.
【0039】なお、本発明のねじ継手は、潤滑被膜中に
防錆添加剤や腐食防止剤を添加し、耐焼き付き性を維持
しながら錆の発生を防止することができる。防錆添加剤
や腐食防止剤は公知のものを使用することができる。In the threaded joint of the present invention, a rust-preventive additive or a corrosion inhibitor is added to the lubricating coating to prevent rust while maintaining seizure resistance. Known rust preventive additives and corrosion inhibitors can be used.
【0040】次ぎに、本発明の方法を説明する。本発明
の方法は、チタンアルコキシド(Ti(OR)4 、R:
アルキル基)と二硫化モリブデン粉末および/または黒
鉛粉末とに分散媒を加えて、混合し、これらをピンとボ
ックスの少なくともいずれか一方の金属接触部に塗布
し、加湿処理を施して共加水分解させて、Ti−Oを骨
格とする無機高分子化合物の潤滑被膜を形成する。Next, the method of the present invention will be described. The method of the present invention provides a method for preparing a titanium alkoxide (Ti (OR) 4 , R:
(Alkyl group) and the molybdenum disulfide powder and / or graphite powder are mixed with a dispersing medium, and the mixture is applied to at least one of the metal contact portions of the pin and the box. Thus, a lubricating coating of an inorganic polymer compound having Ti-O as a skeleton is formed.
【0041】チタンアルコキシドとしては、アルキル基
がメチル、エチル、イソプロピル、プロピル、イソブチ
ル、ブチルなどのアルキル基を備えたチタンアルコキシ
ドを用いることができる。As the titanium alkoxide, a titanium alkoxide having an alkyl group such as methyl, ethyl, isopropyl, propyl, isobutyl and butyl can be used.
【0042】チタンアルコキシドと二硫化モリブデン、
黒鉛の混合割合は、潤滑被膜を形成した後の乾燥した状
態で、無機高分子化合物の含有量(A)と、二硫化モリ
ブデンと黒鉛の合計の含有量(B)との重量比が0.3
以上9.0以下となるように決定される。A titanium alkoxide and molybdenum disulfide,
The mixing ratio of graphite is such that the weight ratio of the content of the inorganic polymer compound (A) to the total content of molybdenum disulfide and graphite (B) in the dried state after the formation of the lubricating coating is 0. 3
It is determined so as to be not less than 9.0 and not more than 9.0.
【0043】分散剤としては、キシレン、塩化メチレ
ン、イソプロピルアルコール、イソブチルアルコール、
ブチルアルコールおよびメチルエチルケトンなどの低沸
点液を単独にあるいは2種類以上組み合わせて用いるこ
とができる。As dispersants, xylene, methylene chloride, isopropyl alcohol, isobutyl alcohol,
Low boiling liquids such as butyl alcohol and methyl ethyl ketone can be used alone or in combination of two or more.
【0044】加湿処理は、大気中に所定時間放置するこ
とにより行うことができるが、湿度が70%以上の雰囲
気下で行うのが望ましい。更に、加湿処理後に加熱処理
を行うことが望ましい。加熱処理により共加水分解が促
進され、加水分解物であるアルキル物質の潤滑被膜内か
らの排出を促進することができ、潤滑被膜の密着性が強
固となり、耐焼付き性が向上する。また、加熱は分散媒
が蒸発した後に行うことが好ましい。加熱温度はアルキ
ル物質の沸点に近い100〜200℃の温度とするのが
よく、熱風を当てるとより効果的である。The humidification treatment can be performed by leaving the humidification treatment in the atmosphere for a predetermined time, but it is preferable to perform the humidification treatment in an atmosphere having a humidity of 70% or more. Further, it is desirable to perform a heat treatment after the humidification treatment. The co-hydrolysis is promoted by the heat treatment, and the discharge of the alkyl substance, which is a hydrolyzate, from the lubricating film can be promoted. The adhesion of the lubricating film becomes strong, and the seizure resistance is improved. The heating is preferably performed after the dispersion medium has evaporated. The heating temperature is preferably 100 to 200 ° C., which is close to the boiling point of the alkyl substance, and it is more effective to apply hot air.
【0045】また、本発明は、潤滑被膜を形成する際
に、予め潤滑被膜を形成する部位にブラスティング加工
を施し、該部位の表面粗さをRmaxで3〜15μmに
するのが望ましい。ブラスティング加工を施すことによ
り、表面に活性な新生面が現れ、潤滑被膜の密着性が強
固になり耐焼き付き性が向上する。ブラスティング加工
は、公知のサンドブラスト法、ショットブラスト法やグ
リッドブラスト法などでよく、サンド、ショット、グリ
ッドやカットワイヤーなどの硬質材を高速で吹き付ける
方法により行うことができる。In the present invention, when forming a lubricating film, it is desirable that blasting be performed in advance on the portion where the lubricating film is to be formed, and that the surface roughness of the portion be 3 to 15 μm in Rmax. By performing the blasting process, an active new surface appears on the surface, the adhesion of the lubricating film is strengthened, and the seizure resistance is improved. The blasting process may be performed by a known sand blasting method, shot blasting method, grid blasting method, or the like, and can be performed by a method of spraying a hard material such as sand, shot, grid or cut wire at high speed.
【0046】[0046]
【実施例】表1に示す成分組成の炭素鋼製、13Cr鋼
製および高合金製のねじ継手(外径:7インチ、肉厚:
0.408インチ)のボックスやピンのねじ部と金属接
触部の双方に各種の下地処理や潤滑被膜形成などの表面
処理を施した。表2、3に表面処理条件を示す。なお、
同表に示す従来例は樹脂被膜を形成した、あるいはコン
パウンドグリスを塗布したものである。EXAMPLES Screw joints made of carbon steel, 13Cr steel and high alloy having the composition shown in Table 1 (outer diameter: 7 inches, wall thickness:
Both the screw portion of the box and the pin and the metal contact portion were subjected to various surface treatments such as a base treatment and formation of a lubricating film. Tables 2 and 3 show the surface treatment conditions. In addition,
In the conventional examples shown in the table, a resin film was formed or compound grease was applied.
【0047】[0047]
【表1】 [Table 1]
【0048】[0048]
【表2】 [Table 2]
【0049】[0049]
【表3】 [Table 3]
【0050】次いで、上記表面処理を施したねじ継手を
用い、表4に示す要領で最大20回の締め付け・締め戻
しの作業を行い、焼き付きの発生状況を調査した。Next, using the threaded joint having been subjected to the above-mentioned surface treatment, tightening and retightening operations were carried out up to 20 times in the manner shown in Table 4 to investigate the occurrence of seizure.
【0051】[0051]
【表4】 [Table 4]
【0052】すなわち、表4に示すように、1〜10回
目、12〜15回目と17〜20回目は常温にて締め付
け・締め戻しを行い、一方、11回目と16回目は常温
にて締め付け後400℃で24時間の加熱処理を行い、
その後冷却して常温で締め戻しを実施した。締め付け速
度と締め付けトルクの条件を表5に示す。That is, as shown in Table 4, the first to tenth, the twelfth to fifteenth, and the seventeenth to twentieth are tightened and retightened at room temperature, while the eleventh and sixteenth are tightened and tightened at room temperature. Perform heat treatment at 400 ° C for 24 hours,
Thereafter, it was cooled and retightened at room temperature. Table 5 shows the conditions of the tightening speed and the tightening torque.
【0053】[0053]
【表5】 [Table 5]
【0054】表6に焼き付き発生状況ならびに締め付け
状況を示す。なお、以下、ピンのねじ部と金属接触部の
双方の表面をピン表面といい、ボックスのねじ部と金属
接触部の双方の表面をボックス表面という。また、表面
粗さはRmax 値で示す。Table 6 shows the state of occurrence of seizure and the state of tightening. Hereinafter, both surfaces of the screw portion and the metal contact portion of the pin are referred to as a pin surface, and both surfaces of the screw portion and the metal contact portion of the box are referred to as a box surface. The surface roughness is indicated by an Rmax value.
【0055】[0055]
【表6】 [Table 6]
【0056】(本発明例1)表1に示す炭素鋼製のねじ
継手に以下の表面処理を施した。ピン表面とボックス表
面は機械研削仕上げで双方とも表面粗さを3μmとし
た。アルキル基がメチルのチタンアルコキシドと、平均
粒径が1.5μmの二硫化モリブデンの粉末と平均粒径
が3.5μmの黒鉛の粉末をチタンアルコキシド1に対
し二硫化モリブデン0.77、黒鉛0.77の重量割合
で混合し、キシレン、塩化メチレンおよびブチルアルコ
ールの混液を分散媒としてボックス表面に塗布した。次
いで大気中で6時間放置した後、乾燥状態で被膜の組成
を測定したところ、含有量は重量の相対値でTi−Oを
骨格とする無機高分子化合物を1とすると、二硫化モリ
ブデンが1、黒鉛が1であり、被膜厚さは40μmであ
った。(Example 1 of the Present Invention) The threaded joint made of carbon steel shown in Table 1 was subjected to the following surface treatment. The surface of the pin and the surface of the box were finished by mechanical grinding to have a surface roughness of 3 μm. A titanium alkoxide having an alkyl group of methyl, a powder of molybdenum disulfide having an average particle diameter of 1.5 μm and a powder of graphite having an average particle diameter of 3.5 μm were obtained by adding 0.77 of molybdenum disulfide and 0.1% of graphite to titanium alkoxide 1. The mixture was mixed at a weight ratio of 77, and a mixture of xylene, methylene chloride and butyl alcohol was applied as a dispersion medium to the box surface. Then, after standing for 6 hours in the air, the composition of the coating film was measured in a dry state. The content was 1 relative to the inorganic polymer compound having a skeleton of Ti-O as a relative value of weight, and the content was 1 molybdenum disulfide. , Graphite, and the coating thickness was 40 μm.
【0057】表6に示すように、表3の16回目の締め
付け・締め戻し作業までは焼き付きの発生が無く良好で
あった。しかし、17回目の締め付け時に焼付きが発生
した (本発明例2)表1に示す炭素鋼製のねじ継手に以下の
表面処理を施した。ピン表面は機械研削仕上げで表面粗
さを2μmとした。ボックス表面は#80番のサンドを
吹き付け、表面粗さを10μmとした。アルキル基がエ
チルのチタンアルコキシドと、平均粒径が1.8μmの
二硫化モリブデンの粉末と平均粒径が2.8μmの黒鉛
の粉末をチタンアルコキシド1に対し二硫化モリブデン
2、黒鉛1.33の重量割合で混合し、キシレン、塩化
メチレンおよびブチルアルコールの混液を分散媒として
ボックス表面に塗布した。次いで、大気中で3時間放置
後に165℃の熱風を30分間吹き付けた。乾燥状態で
被膜の組成を測定したところ、含有量は重量割合でTi
−Oを骨格とする無機高分子化合物1に対し二硫化モリ
ブデン3、黒鉛2であり、被膜厚さは40μmであっ
た。As shown in Table 6, up to the 16th fastening / unfastening operation in Table 3, there was no seizure, which was good. However, seizure occurred during the seventeenth tightening (Example 2 of the present invention). The following surface treatment was applied to the carbon steel threaded joint shown in Table 1. The pin surface was finished by mechanical grinding to have a surface roughness of 2 μm. Sand of # 80 was sprayed on the box surface to make the surface roughness 10 μm. A titanium alkoxide having an alkyl group of ethyl, a powder of molybdenum disulfide having an average particle size of 1.8 μm and a powder of graphite having an average particle size of 2.8 μm were prepared by mixing titanium alkoxide 1 with molybdenum disulfide 2 and graphite 1.33. The mixture was mixed at a weight ratio, and a mixture of xylene, methylene chloride and butyl alcohol was applied as a dispersion medium to the surface of the box. Next, hot air at 165 ° C. was blown for 30 minutes after standing in the air for 3 hours. When the composition of the coating was measured in a dry state, the content was Ti by weight.
Molybdenum disulfide 3 and graphite 2 were used for inorganic polymer compound 1 having —O as a skeleton, and the coating thickness was 40 μm.
【0058】表6に示すように、表3の20回の締め付
け・締め戻しにおいて、焼き付きの発生が無く極めて良
好であった。また、締め付け時の締め込み量ならびに締
め込みトルクも適正であった。As shown in Table 6, there was no seizure during the 20 tightening and retightening operations in Table 3 and the results were extremely good. The tightening amount and the tightening torque at the time of tightening were also appropriate.
【0059】(本発明例3)表1に示す13Cr鋼製の
ねじ継手に以下の表面処理を施した。ボックス表面は機
械研削仕上げで表面粗さを2μmとした。ピン表面は#
80番のグリッドを吹き付け表面粗さを15μmとし
た。アルキル基がイソプロピルのチタンアルコキシド
と、平均粒径が4.6μmの二硫化モリブデンの粉末と
平均粒径が1.3μmの黒鉛の粉末をチタンアルコキシ
ド1に対し二硫化モリブデン2.77、黒鉛0.83の
重量割合で混合し、メチルエチルケトン、塩化メチレン
およびブチルアルコールの混液を分散媒としてボックス
表面に塗布した。次いで、大気中で3時間放置後に15
0℃の熱風を10分間吹き付けた。乾燥状態で被膜の組
成を測定したところ、含有量は重量割合でTi−Oを骨
格とする無機高分子化合物1に対し二硫化モリブデン
5、黒鉛1.5であり、被膜厚さは20μmであった。(Example 3 of the Present Invention) The following surface treatment was applied to a 13Cr steel threaded joint shown in Table 1. The box surface was finished by mechanical grinding to have a surface roughness of 2 μm. Pin surface is #
A No. 80 grid was sprayed to make the surface roughness 15 μm. A titanium alkoxide having an isopropyl alkyl group, a powder of molybdenum disulfide having an average particle diameter of 4.6 μm, and a powder of graphite having an average particle diameter of 1.3 μm were obtained by mixing titanium alkoxide 1 with molybdenum disulfide 2.77 and graphite 0.1. The mixture was mixed at a weight ratio of 83, and a mixture of methyl ethyl ketone, methylene chloride and butyl alcohol was applied as a dispersion medium to the box surface. Then, after leaving in the air for 3 hours, 15
Hot air of 0 ° C. was blown for 10 minutes. When the composition of the coating film was measured in a dry state, the content was 5 parts by weight of molybdenum disulfide and 1.5 parts of graphite with respect to 1 part of the inorganic polymer compound having a skeleton of Ti—O, and the coating thickness was 20 μm. Was.
【0060】表6に示すように、表3の19回目の締め
付け・締め戻し作業までは焼き付きの発生が無く良好で
あった。しかし、20回目の締め付け時に軽度の焼付き
が発生した。但し、手入れにより更に繰り返し使用可能
であると判断された。なお、締め付け時の締め込み量な
らびに締め込みトルクは適正であった。As shown in Table 6, up to the nineteenth fastening / unfastening operation in Table 3, there was no occurrence of seizure, and the result was good. However, slight seizure occurred during the twentieth tightening. However, it was determined that it could be used further repeatedly due to care. The tightening amount and tightening torque at the time of tightening were appropriate.
【0061】(本発明例4)表1に示す高合金鋼製のね
じ継手に以下の表面処理を施した。ピン表面とボックス
表面は180番のサンドを吹き付け、双方とも表面粗さ
を3μmとした。アルキル基がメチルのチタンアルコキ
シドと、平均粒径が1.2μmの二硫化モリブデンの粉
末をチタンアルコキシド1に対し二硫化モリブデン2.
31の重量割合で混合し、キシレン、塩化メチレンおよ
びブチルアルコールの混液を分散媒としてピン表面とボ
ックス表面の双方に塗布した。次いで、大気中で3時間
放置後に165℃の熱風を30分間吹き付けた。乾燥状
態で被膜の組成を測定したところ、ピンおよびボックス
のいずれも、含有量は重量割合でTi−Oを骨格とする
無機高分子化合物1に対し二硫化モリブデン3であり、
被膜厚さは8μmであった。(Invention Example 4) A threaded joint made of high alloy steel shown in Table 1 was subjected to the following surface treatment. No. 180 sand was sprayed on the pin surface and the box surface, and both had a surface roughness of 3 μm. A titanium alkoxide having an alkyl group of methyl and a powder of molybdenum disulfide having an average particle size of 1.2 μm were prepared by mixing titanium alkoxide 1 with molybdenum disulfide 2.
The mixture was mixed at a weight ratio of 31 and a mixture of xylene, methylene chloride and butyl alcohol was applied as a dispersion medium to both the pin surface and the box surface. Next, hot air at 165 ° C. was blown for 30 minutes after standing in the air for 3 hours. When the composition of the coating film was measured in a dry state, the content of both the pin and the box was molybdenum disulfide 3 with respect to the inorganic polymer compound 1 having a skeleton of Ti-O in weight ratio,
The coating thickness was 8 μm.
【0062】表6に示すように、表3の20回の締め付
け・締め戻しにおいて、焼き付きの発生が無く極めて良
好であった。また、締め付け時の締め込み量ならびに締
め込みトルクも適正であった。As shown in Table 6, there was no seizure in 20 times of tightening and retightening shown in Table 3, and it was very good. The tightening amount and the tightening torque at the time of tightening were also appropriate.
【0063】(本発明例5)表1に示す炭素鋼製のねじ
継手に以下の表面処理を施した。ピン表面とボックス表
面は機械研削仕上げで表面粗さを2μmとした。アルキ
ル基がイソブチルのチタンアルコキシドと、平均粒径が
3.1μmの二硫化モリブデンの粉末と平均粒径が3.
5μmの黒鉛の粉末をチタンアルコキシド1に対し二硫
化モリブデン1.39、黒鉛0.83の重量割合で混合
し、キシレン、塩化メチレンおよびイソブチルアルコー
ルの混液を分散媒としてボックス表面に塗布した。次い
で大気中で6時間放置した後、乾燥状態で被膜の組成を
測定したところ、含有量は重量割合でTi−Oを骨格と
する無機高分子化合物を1とすると、二硫化モリブデン
が2.5、黒鉛が1.5であり、被膜厚さは30μmで
あった。(Example 5 of the Invention) The following surface treatment was applied to the carbon steel threaded joint shown in Table 1. The pin surface and the box surface were finished by mechanical grinding to have a surface roughness of 2 μm. A titanium alkoxide having an alkyl group of isobutyl, a powder of molybdenum disulfide having an average particle size of 3.1 μm, and an average particle size of 3.
5 μm of graphite powder was mixed with titanium alkoxide 1 at a weight ratio of 1.39 of molybdenum disulfide and 0.83 of graphite, and the mixture was applied to the surface of a box using a mixed solution of xylene, methylene chloride and isobutyl alcohol as a dispersion medium. Then, after leaving it in the air for 6 hours, the composition of the coating film was measured in a dry state. Assuming that the content of the inorganic polymer compound having a skeleton of Ti—O as 1 by weight, the content of molybdenum disulfide was 2.5%. , Graphite, and the coating thickness was 30 μm.
【0064】表6に示すように、表3の19回目の締め
付け・締め戻し作業までは焼き付きの発生が無く良好で
あった。しかし、20回目の締め付け時に焼付きが発生
した。但し、締め付け時の締め込み量ならびに締め込み
トルクは適正であった。As shown in Table 6, up to the nineteenth tightening and re-tightening work in Table 3, there was no occurrence of seizure and the result was good. However, seizure occurred during the twentieth fastening. However, the tightening amount and the tightening torque at the time of tightening were appropriate.
【0065】(本発明例6)表1に示す13Cr鋼製の
ねじ継手に以下の表面処理を施した。ピン表面とボック
ス表面に#120番のサンドを吹き付け、双方とも表面
粗さを5μmとした。アルキル基がエチルのチタンアル
コキシドと、平均粒径が1.0μmの二硫化モリブデン
の粉末をチタンアルコキシド1に対し二硫化モリブデン
0.23の重量割合で混合し、キシレン、塩化メチレン
およびブチルアルコールの混液を分散媒としてピン表面
とボックス表面の双方に塗布した。次いで、大気中で4
時間放置後に150℃の熱風を15分間吹き付けた。乾
燥状態で被膜の組成を測定したところ、ピンおよびボッ
クスのいずれも、含有量は重量割合でTi−Oを骨格と
する無機高分子化合物1に対し二硫化モリブデン0.3
5であり、被膜厚さは20μmであった。(Example 6 of the Invention) A threaded joint made of 13Cr steel shown in Table 1 was subjected to the following surface treatment. A # 120 sand was sprayed on the pin surface and the box surface, and both had a surface roughness of 5 μm. A titanium alkoxide having an alkyl group of ethyl and a powder of molybdenum disulfide having an average particle diameter of 1.0 μm are mixed at a weight ratio of 0.23 molybdenum disulfide to 1 titanium alkoxide, and a mixture of xylene, methylene chloride and butyl alcohol Was applied to both the pin surface and the box surface as a dispersion medium. Then, in the atmosphere 4
After standing for a while, hot air at 150 ° C. was blown for 15 minutes. When the composition of the coating film was measured in a dry state, the content of both the pin and the box was 0.3 wt% of molybdenum disulfide with respect to the inorganic polymer compound 1 having a skeleton of Ti—O.
5, and the coating thickness was 20 μm.
【0066】表6に示すように、表3の19回目の締め
付け・締め戻し作業までは焼き付きの発生が無く良好で
あった。しかし、20回目の締め付け後に軽度の焼付き
が認められた。但し、手入れにより更に繰り返し使用可
能であると判断された。なお、締め付け時の締め込み量
ならびに締め込みトルクは適正であった。As shown in Table 6, up to the nineteenth tightening and retightening work in Table 3, there was no occurrence of seizure and the result was good. However, slight seizure was observed after the 20th tightening. However, it was determined that it could be used further repeatedly due to care. The tightening amount and tightening torque at the time of tightening were appropriate.
【0067】(本発明例7)表1に示す炭素鋼製の継手
に以下の表面処理を施した。ボックス表面は機械研削仕
上げで表面粗さを2μmとした。ピン表面に#80番の
グリッドを吹き付け表面粗さを10μmとした。アルキ
ル基がイソプロピルのチタンアルコキシドと、平均粒径
が1.8μmの二硫化モリブデンの粉末と平均粒径が
2.5μmの黒鉛の粉末をチタンアルコキシド1に対し
二硫化モリブデン3.05、黒鉛1.94の重量割合で
混合し、メチルエチルケトン、塩化メチレンおよびイソ
ブチルアルコールの混液を分散媒としてピン表面に塗布
した。次いで、大気中で2時間放置後に150℃の熱風
を15分間吹き付けた。乾燥状態で被膜の組成を測定し
たところ、含有量は重量割合でTi−Oを骨格とする無
機高分子化合物1に対し二硫化モリブデン5.5、黒鉛
3.5であり、被膜厚さは20μmであった。(Example 7 of the Present Invention) The joints made of carbon steel shown in Table 1 were subjected to the following surface treatment. The box surface was finished by mechanical grinding to have a surface roughness of 2 μm. A # 80 grid was sprayed on the pin surface to make the surface roughness 10 μm. A titanium alkoxide having an isopropyl alkyl group, molybdenum disulfide powder having an average particle diameter of 1.8 μm, and graphite powder having an average particle diameter of 2.5 μm were obtained by mixing molybdenum disulfide 3.05 and graphite 1. The mixture was mixed at a weight ratio of 94, and a mixture of methyl ethyl ketone, methylene chloride and isobutyl alcohol was applied to the pin surface as a dispersion medium. Next, hot air at 150 ° C. was blown for 15 minutes after standing in the air for 2 hours. When the composition of the coating film was measured in a dry state, the content was 5.5 parts by weight of molybdenum disulfide and 3.5 parts by weight of graphite relative to inorganic polymer compound 1 having Ti—O as a skeleton, and the coating thickness was 20 μm. Met.
【0068】表6に示すように、表3の20回の締め付
け・締め戻しにおいて、焼き付きの発生が無く極めて良
好であった。また、締め付け時の締め込み量ならびに締
め込みトルクも適正であった。As shown in Table 6, there was no occurrence of seizure in the tightening and retightening of 20 times in Table 3 and it was very good. The tightening amount and the tightening torque at the time of tightening were also appropriate.
【0069】(本発明例8)表1に示す13Cr鋼製の
継手に下記の表面処理を施した。ピン表面とボックス表
面に#120番のサンドを吹き付け、双方とも表面粗さ
を4μmとした。アルキル基がプロピルのチタンアルコ
キシドと、平均粒径が1.2μmの二硫化モリブデンの
粉末と平均粒径が1.5μmの黒鉛の粉末をチタンアル
コキシド1に対し二硫化モリブデン2.78、黒鉛0.
83の重量割合で混合し、キシレン、塩化メチレンおよ
びブチルアルコールの混液を分散媒としてピン表面とボ
ックス表面の双方に塗布した。次いで、大気中で3時間
放置後に140℃の熱風を20分間吹き付けた。乾燥状
態で被膜の組成を測定したところ、ピンおよびボックス
のいずれも、含有量は重量割合でTi−Oを骨格とする
無機高分子化合物1に対し二硫化モリブデン5.0、黒
鉛1.5であり、被膜厚さは5μmであった。(Example 8 of the Invention) A joint made of 13Cr steel shown in Table 1 was subjected to the following surface treatment. A # 120 sand was sprayed on the pin surface and the box surface, and both had a surface roughness of 4 μm. A titanium alkoxide having an alkyl group of propyl, a powder of molybdenum disulfide having an average particle diameter of 1.2 μm, and a powder of graphite having an average particle diameter of 1.5 μm were obtained by adding 2.78 of molybdenum disulfide and graphite of 0.1 to titanium alkoxide.
The mixture was mixed at a weight ratio of 83 and a mixture of xylene, methylene chloride and butyl alcohol was applied as a dispersion medium to both the pin surface and the box surface. Next, after being left in the air for 3 hours, hot air at 140 ° C. was blown for 20 minutes. When the composition of the coating film was measured in a dry state, the content of both the pin and the box was determined by using molybdenum disulfide 5.0 and graphite 1.5 with respect to the weight of the inorganic polymer compound 1 having a skeleton of Ti—O. And the coating thickness was 5 μm.
【0070】表6に示すように、表3の20回の締め付
け・締め戻しにおいて、焼き付きの発生が無く極めて良
好であった。また、締め付け時の締め込み量ならびに締
め込みトルクも適正であった。As shown in Table 6, there was no seizure in 20 tightening / unfastening operations in Table 3 and the result was extremely good. The tightening amount and the tightening torque at the time of tightening were also appropriate.
【0071】(本発明例9)表1に示す高合金鋼製の継
手に下記の表面処理を施した。ピン表面とボックス表面
は機械研削仕上げで表面粗さを2μmとした。アルキル
基がエチルのチタンアルコキシドと、平均粒径が1.2
μmの二硫化モリブデンの粉末と平均粒径が1.5μm
の黒鉛の粉末をチタンアルコキシド1に対し二硫化モリ
ブデ1.33、黒鉛1.0の重量割合で混合し、キシレ
ン、塩化メチレンおよびブチルアルコールの混液を分散
媒としてボックス表面に塗布した。次いで大気中で6時
間放置した後、乾燥状態で被膜の組成を測定したとこ
ろ、ピン側、ボックス側のいずれも含有量は重量割合で
Ti−Oを骨格とする無機高分子化合物を1とすると、
二硫化モリブデンが2.0、黒鉛が1.5であり、被膜
厚さはピン側が10μm、ボックス側が30μmであっ
た。(Example 9 of the Invention) The joints made of high alloy steel shown in Table 1 were subjected to the following surface treatment. The pin surface and the box surface were finished by mechanical grinding to have a surface roughness of 2 μm. A titanium alkoxide having an alkyl group of ethyl and an average particle diameter of 1.2;
μm molybdenum disulfide powder and average particle size 1.5 μm
Was mixed with 1.3 parts by weight of molybdenum disulfide and 1.0 part by weight of graphite with respect to 1 titanium alkoxide, and a mixture of xylene, methylene chloride and butyl alcohol was applied as a dispersion medium to the surface of the box. Then, after being left in the air for 6 hours, the composition of the film was measured in a dry state, and the content of both the pin side and the box side was 1 in the inorganic polymer compound having Ti-O as a skeleton by weight. ,
Molybdenum disulfide was 2.0, graphite was 1.5, and the coating thickness was 10 μm on the pin side and 30 μm on the box side.
【0072】表6に示すように、表3の20回の締め付
け・締め戻しにおいて、焼き付きの発生が無く極めて良
好であった。また、締め付け時の締め込み量ならびに締
め込みトルクも適正であった。As shown in Table 6, the seizure and retightening performed 20 times in Table 3 were extremely good with no occurrence of seizure. The tightening amount and the tightening torque at the time of tightening were also appropriate.
【0073】(従来例1)表1に示す13Cr鋼製の継
手に下記の表面処理を施した。ピン表面とボックス表面
に#80番のサンドを吹き付け、双方とも表面粗さを1
0μmとした。エポキシ樹脂と平均粒径が1.8μmの
二硫化モリブデン粉末をエポキシ樹脂1に対し二硫化モ
リブデン1の重量割合でトルエン、イソプロピルアルコ
ール等の混液を分散媒として混合し、ピン表面とボック
ス表面の双方に塗布した。次いで、乾燥後180℃で3
0分間の加熱処理を実施した。加熱処理後の被膜の組成
を測定したところ、ピン及びボックスのいずれも、含有
量は重量割合でエポキシ樹脂1に対し二硫化モリブデン
1であり、被膜厚は20μmであった。(Conventional Example 1) A joint made of 13Cr steel shown in Table 1 was subjected to the following surface treatment. # 80 sand is sprayed on the pin surface and the box surface, and both have a surface roughness of 1
It was set to 0 μm. An epoxy resin and molybdenum disulfide powder having an average particle diameter of 1.8 μm are mixed with epoxy resin 1 in a weight ratio of molybdenum disulfide 1 to a mixed solution of toluene, isopropyl alcohol, and the like as a dispersion medium, and both the pin surface and the box surface are mixed. Was applied. Then, after drying at 180 ° C., 3
A heat treatment for 0 minutes was performed. When the composition of the coating film after the heat treatment was measured, the content of both the pin and the box was 1 molybdenum disulfide to 1 epoxy resin in weight ratio, and the coating thickness was 20 μm.
【0074】表6に示すように、12回目の締め付けで
軽度の焼き付きが認められ、また、締め付け量が不足し
てショルダー部に所定の面圧を負荷することができなか
った。そこで、所定位置まで締込むよう締付けトルクを
高めたところ、13回目の締付けで焼付きが発生した。As shown in Table 6, slight seizure was observed in the twelfth tightening, and a predetermined surface pressure could not be applied to the shoulder due to insufficient tightening. Then, when the tightening torque was increased to tighten to the predetermined position, seizure occurred in the thirteenth tightening.
【0075】(従来例2)表1に示す炭素鋼製の継手に
下記の表面処理を施した。ピン表面は機械研削仕上げで
表面粗さを2μmとした。表面粗さ2μmに機械研削仕
上げを施されたボックス表面に厚さ2μmの溶融塩窒化
層を形成し、その上に厚さ15μmの燐酸マンガン層を
形成した。次いで、ポリアミドイミド樹脂と平均粒径が
3.5μmの二硫化タングステン粉末をポリアミドイミ
ド樹脂1に対し二硫化モリブデン1の重量割合でキシレ
ン、トルエンおよびイソプロピルアルコールの混液を分
散剤として混合し、上記燐酸マンガン層の上面に塗布し
た。次いで、乾燥後180℃で30分の加熱処理を実施
した。加熱処理後の被膜の組成を測定したところ、含有
量は重量割合でポリアミドイミド樹脂1に対して二硫化
モリブデン1であり、被膜厚は35μmであった。(Conventional Example 2) The joints made of carbon steel shown in Table 1 were subjected to the following surface treatment. The pin surface was finished by mechanical grinding to have a surface roughness of 2 μm. A 2 μm thick molten oxynitride layer was formed on the box surface which had been subjected to mechanical grinding to a surface roughness of 2 μm, and a 15 μm thick manganese phosphate layer was formed thereon. Then, a polyamide imide resin and tungsten disulfide powder having an average particle diameter of 3.5 μm are mixed at a weight ratio of molybdenum disulfide 1 to the polyamide imide resin 1 with a mixed liquid of xylene, toluene and isopropyl alcohol as a dispersant. Coated on top of manganese layer. Next, after drying, a heat treatment was performed at 180 ° C. for 30 minutes. When the composition of the coating film after the heat treatment was measured, the content was 1 part of molybdenum disulfide with respect to 1 part of the polyamideimide resin by weight, and the coating thickness was 35 μm.
【0076】表6に示すように、12回目の締め付けで
焼き付きは認められなかったが、締付け量が不足して、
ショルダー部に所定の面圧がかからなかった。そこで、
所定位置まで締込むよう締付けトルクを高めたところ、
14回目の締め付けで焼付きが発生した。As shown in Table 6, no seizure was observed in the twelfth tightening, but the tightening amount was insufficient.
The prescribed surface pressure was not applied to the shoulder. Therefore,
After increasing the tightening torque to tighten to the specified position,
Seizure occurred in the 14th tightening.
【0077】(従来例3)表1に示す13Cr鋼製の継
手に下記の表面処理を施した。ボックス表面は機械研削
仕上げで表面粗さを2μmとした。#80番のサンドを
吹き付けて表面粗さ10μmとしたピン表面に厚さ15
μmの燐酸マンガン層を形成し、その上にエポキシ樹脂
と平均粒径が1.8μmの二硫化モリブデン粉末をエポ
キシ樹脂1に対して二硫化モリブデン1の重量割合でト
ルエン、イソプロピルアルコール等の混液を分散媒とし
て混合し塗布した。次いで、乾燥後180℃で30分の
加熱処理を実施した。加熱処理後の被膜の組成を測定し
たところ、含有量は重量割合でエポキシ樹脂1に対して
二硫化モリブデン1であり、被膜厚は30μmであっ
た。(Conventional Example 3) Joints made of 13Cr steel shown in Table 1 were subjected to the following surface treatment. The box surface was finished by mechanical grinding to have a surface roughness of 2 μm. # 15 sand is sprayed onto the surface of the pin to make the surface roughness 10 μm.
A manganese phosphate layer having a thickness of μm is formed, and an epoxy resin and molybdenum disulfide powder having an average particle size of 1.8 μm are mixed thereon with a mixed solution of toluene, isopropyl alcohol and the like in a weight ratio of the molybdenum disulfide 1 to the epoxy resin 1. It was mixed and applied as a dispersion medium. Next, after drying, a heat treatment was performed at 180 ° C. for 30 minutes. When the composition of the coating film after the heat treatment was measured, the content was 1 molybdenum disulfide with respect to 1 epoxy resin in weight ratio, and the coating thickness was 30 μm.
【0078】表6に示すように、12回目の締め付けで
焼き付きが認められ、しかも、締付け量が不足して、シ
ョルダー部に所定の面圧を負荷することができなかっ
た。As shown in Table 6, seizure was observed in the twelfth tightening, and the tightening amount was insufficient, so that a predetermined surface pressure could not be applied to the shoulder.
【0079】(従来例4)表1に示す13Cr鋼製の継
手に下記の表面処理を施した。ピン表面は機械研削仕上
げで表面粗さを2μmとした。表面粗さ2μmに機械研
削仕上げを施したボックス表面に厚さ10μmのCuメ
ッキ処理を施した。次いで、ピン表面とボックス表面の
双方にAPI−Bul5A2に相当するコンパウンドグ
リスを単位面積(1dm2 )当たり約20gの割合で塗
布した。(Conventional Example 4) A joint made of 13Cr steel shown in Table 1 was subjected to the following surface treatment. The pin surface was finished by mechanical grinding to have a surface roughness of 2 μm. A 10 μm-thick Cu plating process was applied to the box surface that had been subjected to mechanical grinding to a surface roughness of 2 μm. Next, compound grease corresponding to API-Bul5A2 was applied to both the pin surface and the box surface at a rate of about 20 g per unit area (1 dm 2 ).
【0080】表6に示すように、12回目の締め付けで
軽度の焼き付きが認められ、また、締め付け量が不足し
てショルダー部に所定の面圧を負荷することができなか
った。そこで、所定位置まで締込むよう締付けトルクを
高めたところ、13回目の締付けで焼付きが発生した。As shown in Table 6, slight seizure was observed in the twelfth tightening, and a predetermined surface pressure could not be applied to the shoulder due to an insufficient tightening amount. Then, when the tightening torque was increased to tighten to the predetermined position, seizure occurred in the thirteenth tightening.
【0081】(従来例5)表1に示す炭素鋼製の継手に
下記の表面処理を施した。ピン表面は機械研削仕上げで
表面粗さを2μmとした。#80番のサンドを吹き付け
表面粗さを10μmとしたボックス表面に厚さ15μm
の燐酸マンガン処理を施した。次いで、ピン表面とボッ
クス表面の双方にAPI−Bul5A2に相当するコン
パウンドグリスを単位面積(1dm2 )当たり約20g
の割合で塗布した。(Conventional Example 5) The joints made of carbon steel shown in Table 1 were subjected to the following surface treatment. The pin surface was finished by mechanical grinding to have a surface roughness of 2 μm. # 15 sand is sprayed onto the box surface with a surface roughness of 10 μm by spraying # 80 sand to a thickness of 15 μm
Manganese phosphate treatment. Then, about 20 g of compound grease corresponding to API-Bul5A2 was applied to both the pin surface and the box surface per unit area (1 dm 2 ).
At a rate of
【0082】表6に示すように、8回目の締め付けから
軽度の焼付きが発生したが手入れを実施して試験を継続
した。しかし、11回目の締め戻し時に焼付きが認めら
れ、12回目の締付けで焼付きが著しくなるとともに、
締付け量が不足して、ショルダー部に所定の面圧を負荷
することができなかった以上のように、本発明のTi−
Oを骨格とする無機潤滑被膜は従来の燐酸マンガン被
膜、Cuメッキ、樹脂をバインダーとした被膜に比べ、
高温履歴時の耐焼付き性に優れることが判った。As shown in Table 6, slight seizure occurred from the eighth tightening, but care was carried out and the test was continued. However, seizure was recognized at the time of the eleventh tightening, and seizure became remarkable by the twelfth tightening.
As described above, the predetermined amount of surface pressure could not be applied to the shoulder due to insufficient tightening amount.
Compared to conventional manganese phosphate coating, Cu plating, and coating using resin as binder,
It was found that the seizure resistance during the high temperature history was excellent.
【0083】[0083]
【発明の効果】本発明によるねじ継手は高深度、高温油
井、あるいは蒸気注入油井等の400℃にも達する高温
環境下の原油採掘における繰り返しの締め付け、緩め戻
しの際の耐焼き付き性を著しく向上させることができ
る。The threaded joint according to the present invention has remarkably improved seizure resistance when repeatedly tightening and loosening in crude oil mining under a high temperature environment of up to 400 ° C., such as a deep depth, a high temperature oil well, or a steam injection oil well. Can be done.
【図1】本発明の油井管用ねじ継手の構成を模式的に示
す概要図である。FIG. 1 is a schematic view schematically showing a configuration of a threaded joint for oil country tubular goods of the present invention.
【図2】本発明に係る潤滑被膜の形成状況の一例を示す
模式的断面図である。FIG. 2 is a schematic sectional view showing an example of a state of forming a lubricating film according to the present invention.
1:ボックス、2:ピン、3:ねじ部、4:ねじ無し金
属接触部、5:ショルダー部、6:潤滑被膜、7:無機
高分子化合物、8:固体潤滑剤。1: box, 2: pin, 3: screw part, 4: screwless metal contact part, 5: shoulder part, 6: lubricating coating, 7: inorganic polymer compound, 8: solid lubricant.
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3H013 GA01 4K022 AA02 AA31 AA48 BA05 BA12 BA15 BA19 BA22 BA33 CA02 DA06 EA01 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H013 GA01 4K022 AA02 AA31 AA48 BA05 BA12 BA15 BA19 BA22 BA33 CA02 DA06 EA01
Claims (6)
れ有するピンとボックスとから構成されるねじ継手にお
いて、ボックスとピンの少なくともいずれか一方のねじ
無し金属接触部に、二硫化モリブデンおよび/または黒
鉛を分散混合したTi−Oを骨格とする無機高分子化合
物の潤滑被膜を形成したことを特徴とする油井管用ねじ
継手。1. A threaded joint comprising a pin and a box each having a threaded portion and a threadless metal contact portion, wherein at least one of the box and the pin has a threadless metal contact portion with molybdenum disulfide and / or molybdenum disulfide. A threaded joint for oil country tubular goods, wherein a lubricating coating of an inorganic polymer compound having a skeleton of Ti-O in which graphite is dispersed and mixed is formed.
と、二硫化モリブデンと黒鉛の合計の含有量(B)との
重量比(B/A)が0.3〜9.0であることを特徴と
する請求項1に記載の油井管用ねじ継手。2. Content (A) of the inorganic polymer compound
The threaded joint for oil country tubular goods according to claim 1, wherein the weight ratio (B / A) of the total content (B) of molybdenum disulfide and graphite is 0.3 to 9.0.
がRmaxで3〜15μmであることを特徴とする請求
項1または2に記載の油井管用ねじ継手。3. The threaded joint for an oil country tubular good according to claim 1, wherein the surface where the lubricating film is formed has a surface roughness of 3 to 15 μm in Rmax.
ることを特徴とする請求項1ないし3のいずれかに記載
の油井管用ねじ継手。4. The threaded joint for an oil country tubular good according to claim 1, wherein the lubricating coating has a thickness of 5 to 30 μm.
れ有するピンとボックスとから構成されるねじ継手のボ
ックスとピンの少なくともいずれか一方のねじ無し金属
接触部に、チタンアルコキシド(Ti(OR)4 、R:
アルキル基)と二硫化モリブデンおよび/または黒鉛と
を混合して塗布し、加湿処理を施して共加水分解させ
て、Ti−Oを骨格とする無機高分子化合物の潤滑被膜
を形成することを特徴とする油井管用ねじ継手の潤滑被
膜形成方法。5. A titanium alkoxide (Ti (OR)) is applied to at least one of the threadless metal contact portion of the box and the pin of the threaded joint comprising a pin and a box each having a threaded portion and a threadless metal contact portion. 4 , R:
(Alkyl group) and molybdenum disulfide and / or graphite are mixed, applied, humidified, and co-hydrolyzed to form a lubricating film of an inorganic polymer compound having a Ti-O skeleton. A method for forming a lubricating film on a threaded joint for oil country tubular goods.
滑被膜を形成する部位にブラスティング加工を施し、該
部位の表面粗さをRmaxで3〜15μmにすることを
特徴とする請求項5に記載の油井管用ねじ継手の潤滑被
膜形成方法。6. The method according to claim 5, wherein when forming the lubricating film, a blasting process is performed in advance on a portion where the lubricating film is to be formed, and the surface roughness of the portion is 3 to 15 μm in Rmax. A method for forming a lubricating film for a threaded joint for oil country tubular goods as described in the above.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24189099A JP2001065752A (en) | 1999-08-27 | 1999-08-27 | Screw joint for oil well pipe and lublication film forming method therefor |
CA002383894A CA2383894C (en) | 1999-08-27 | 2000-08-24 | Threaded joint for oil well pipe |
EP00954946A EP1211451B1 (en) | 1999-08-27 | 2000-08-24 | Threaded joint for oil well pipe |
AU67271/00A AU6727100A (en) | 1999-08-27 | 2000-08-24 | Threaded joint for oil well pipe |
PCT/JP2000/005661 WO2001016516A1 (en) | 1999-08-27 | 2000-08-24 | Threaded joint for oil well pipe |
EP07020123A EP1882874B1 (en) | 1999-08-27 | 2000-08-24 | Threaded joint for oil well pipe |
US10/082,212 US6679526B2 (en) | 1999-08-27 | 2002-02-26 | Threaded joint for an oil well pipe |
NO20020955A NO336986B1 (en) | 1999-08-27 | 2002-02-27 | Threaded connection for oil well pipes |
NO20141507A NO337618B1 (en) | 1999-08-27 | 2014-12-12 | Threaded connection for oil well pipes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24189099A JP2001065752A (en) | 1999-08-27 | 1999-08-27 | Screw joint for oil well pipe and lublication film forming method therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001065752A true JP2001065752A (en) | 2001-03-16 |
Family
ID=17081083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24189099A Pending JP2001065752A (en) | 1999-08-27 | 1999-08-27 | Screw joint for oil well pipe and lublication film forming method therefor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2001065752A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003006867A1 (en) * | 2001-07-13 | 2003-01-23 | Sumitomo Metal Industries, Ltd. | Pipe thread joint |
US7066209B2 (en) | 2004-04-27 | 2006-06-27 | Sumitomo Metal Industries, Ltd. | Thread protector |
WO2011027433A1 (en) * | 2009-09-02 | 2011-03-10 | 住友金属工業株式会社 | Protector for threaded joint for pipe |
US8322754B2 (en) | 2006-12-01 | 2012-12-04 | Tenaris Connections Limited | Nanocomposite coatings for threaded connections |
JP2013079157A (en) * | 2011-09-30 | 2013-05-02 | Nippon Tungsten Co Ltd | Membranous inorganic material |
US8622091B2 (en) | 2008-08-14 | 2014-01-07 | Nippon Steel & Sumitomo Metal Corporation | Protector for tubular threaded joint |
US10513793B2 (en) | 2014-02-19 | 2019-12-24 | Tenaris Connections B.V. | Threaded joint for an oil well pipe |
-
1999
- 1999-08-27 JP JP24189099A patent/JP2001065752A/en active Pending
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003006867A1 (en) * | 2001-07-13 | 2003-01-23 | Sumitomo Metal Industries, Ltd. | Pipe thread joint |
US6957834B2 (en) | 2001-07-13 | 2005-10-25 | Sumitomo Metal Industries, Ltd. | Threaded joint for pipes |
US7066209B2 (en) | 2004-04-27 | 2006-06-27 | Sumitomo Metal Industries, Ltd. | Thread protector |
US8322754B2 (en) | 2006-12-01 | 2012-12-04 | Tenaris Connections Limited | Nanocomposite coatings for threaded connections |
US8758876B2 (en) | 2006-12-01 | 2014-06-24 | Tenaris Connections Limited | Nanocomposite coatings for threaded connections |
US8622091B2 (en) | 2008-08-14 | 2014-01-07 | Nippon Steel & Sumitomo Metal Corporation | Protector for tubular threaded joint |
WO2011027433A1 (en) * | 2009-09-02 | 2011-03-10 | 住友金属工業株式会社 | Protector for threaded joint for pipe |
JP5447527B2 (en) * | 2009-09-02 | 2014-03-19 | 新日鐵住金株式会社 | Tube threaded joint protector |
JP2013079157A (en) * | 2011-09-30 | 2013-05-02 | Nippon Tungsten Co Ltd | Membranous inorganic material |
US10513793B2 (en) | 2014-02-19 | 2019-12-24 | Tenaris Connections B.V. | Threaded joint for an oil well pipe |
US11359303B2 (en) | 2014-02-19 | 2022-06-14 | Tenaris Connections B.V. | Threaded joint for an oil well pipe |
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