CN104482334A - 管螺纹接头 - Google Patents
管螺纹接头 Download PDFInfo
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- CN104482334A CN104482334A CN201410510815.4A CN201410510815A CN104482334A CN 104482334 A CN104482334 A CN 104482334A CN 201410510815 A CN201410510815 A CN 201410510815A CN 104482334 A CN104482334 A CN 104482334A
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- overlay film
- contact surface
- solid
- screw joint
- pin
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- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- UQMZPFKLYHOJDL-UHFFFAOYSA-N zinc;cadmium(2+);disulfide Chemical compound [S-2].[S-2].[Zn+2].[Cd+2] UQMZPFKLYHOJDL-UHFFFAOYSA-N 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/48—Stabilisers against degradation by oxygen, light or heat
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M101/025—Petroleum fractions waxes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C—CHEMISTRY; METALLURGY
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M147/02—Monomer containing carbon, hydrogen and halogen only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- E—FIXED CONSTRUCTIONS
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- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
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- 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
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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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/182—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for screw-threaded joints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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Abstract
一种管螺纹接头,其由分别具备具有螺纹部和无螺纹金属接触部的接触表面的销和套盒构成;在销的接触表面仅形成有以紫外线固化树脂作为主要成分的、透明的固体防腐蚀覆膜作为最上层;在套盒的接触表面仅设置有具有塑性或粘塑性型流变特性的固体润滑覆膜作为最上层,其优选由含有热塑性聚合物、蜡、金属皂、腐蚀抑制剂、水不溶性液状树脂和固体润滑剂的组合物通过热熔法而形成。
Description
本申请是申请日为2008年12月02日、申请号为200880126190.4、发明名称为“管螺纹接头”的申请的分案申请。
技术领域
本发明涉及用于连结钢管、尤其是油井管(OCTG)的管螺纹接头、以及其表面处理方法。本发明的管螺纹接头在连结油井管时不需要涂布一直以来在螺纹接头上涂布的复合油脂,能够可靠地发挥优异的耐磨损性(galling resistance)和耐腐蚀性。因此,该管螺纹接头能够避免由复合油脂引起的对地球环境和人体的不良影响。
背景技术
用于挖掘原油、气油的油井挖掘中使用的被称为配管、套管的油井管,通常使用管螺纹接头来进行连结。以往,油井的深度为2000~3000m,但近年来的海上油田等深油井有时会达到或超过8000~10000m。
在使用环境中,油井管连结用的螺纹接头受到由油井管和接头自身的重量引起的轴向拉力的负荷、内外表面压力等复合的压力、以及地热的作用,因而要求即便在这种苛刻的环境下也能够保持气密性而不破损。
用于连结油井管的典型的螺纹接头为销-套盒(pin-box)结构,销为例如具有形成于油井管端部的阳螺纹的接头元件,套盒为例如具有形成于螺纹接头部件(管接头(coupling))的内表面的阴螺纹的接头元件。在被称为高级接头(premium joint)的气密性优异的螺纹接头中,在销的阳螺纹的前端和套盒的阴螺纹的基部分别形成有无螺纹金属接触部。无螺纹金属接触部能够包含形成于销和套盒的圆周面的金属密封面、以及与螺纹接头的轴向大致垂直的扭矩台肩(torque shoulder)面。通过将油井管的一端插入到螺纹接头部件中,并使销的阳螺纹与套盒的阴螺纹紧固,能够使销和套盒的无螺纹金属接触部之间以规定的干涉量抵接而形成金属密封部,从而可确保气密性。
在将配管或套管降至油井的操作中,由于各种问题,有时需要将之前已经连结的接头松开,在将它们提升出油井后,再次进行连结并将其放下。API(美国石油协会)要求耐磨损性,其意思是指即便对配管接头进行10次的、对套管接头进行3次的管组装(紧固)和拆下(松开),也可保持气密性,而不会产生被称为擦伤(galling)的磨损。
在紧固时,为了提高耐磨损性和气密性,将被称为“复合油脂”的含有重金属粉末的粘稠的液状润滑剂涂布于螺纹接头的接触表面(销与套盒的螺纹部以及无螺纹金属接触部)。在API标准BUL 5A2中规定了这样的复合油脂。另外,复合油脂还可发挥防止所涂布的接触表面产生锈这种耐腐蚀性能。
为了提高该复合油脂的保持性以及改善滑动性,提出了对螺纹接头的接触表面实施氮化处理、包括镀锌和复合镀在内的各种镀覆、以及磷酸盐化学转化处理这样的各种1层或2层以上的表面处理。然而,如下所述,复合油脂的使用存在对环境和人体造成不良影响的危险。
复合油脂含有大量的锌、铅、铜等重金属粉末。在螺纹接头连结时,所涂布的油脂被冲洗掉或溢出到外表面,特别是由于铅等有害重金属可能对环境、特别是海洋生物产生不良影响。另外,复合油脂的涂布操作还会使操作环境恶化,对人体的有害性也令人担忧。
近年来,以1998年生效的关于防止东北大西洋的海洋污染的OSPAR条约(Oslo-Paris条约、OSPAR)为契机,全球规模的对于环境的严格限制进一步发展,在部分地区复合油脂的使用也已经受到了限制。因此,为了在气井或油井的挖掘操作中避免对环境和人体的不良影响,要求在不使用复合油脂的情况下也能够发挥优异的耐磨损性的螺纹接头。
作为复合油脂的其他问题,可列举出,由于含有大量的以石墨为代表的固体润滑剂,因而覆膜并非透明的。管外表面具有螺纹部的销与管内表面具有螺纹部的套盒相比,在搬运中或连结时的故障中更容易受到损伤,因而在连结操作前多检查销的螺纹部有无损伤。在涂布复合油脂的情况下,必须在该检查时洗涤销而冲洗掉复合油脂,并在检查后再次涂布复合油脂。如上所述,该操作对环境有害,且比较麻烦。如果润滑覆膜是透明的,则不需要除去覆膜就能够检查螺纹部有无损伤,能够大幅度减轻检查操作的时间和劳力。
作为在不涂布复合油脂的情况下也能够用于连结油井管的螺纹接头,本申请人等之前在WO2006/104251号公报中提出了一种管螺纹接头,其中,销和套盒中的至少一种构件的接触表面被由粘稠液体或半固体的润滑覆膜、以及形成于其上的干燥固体覆膜构成的2层覆膜所包覆。干燥固体覆膜能够由丙烯酸系树脂等热固型树脂覆膜或紫外线固化型树脂覆膜形成。粘稠液体或半固体的润滑覆膜具有粘性,容易附着异物,但通过在其上形成干燥固体覆膜,可以消除粘性。在连结螺纹接头时,干燥固体覆膜被破坏,因而不会妨碍其下方的润滑覆膜的润滑性。该管螺纹接头具有优异的润滑性能,且耐磨损性充分,但需要形成润滑覆膜以及形成于其上的干燥固体覆膜这种2层结构的覆膜,因而成本变高。另外,在螺纹连结时2层覆膜被破坏,此时出现片状物(flake),因而之后的外观较差。另外,覆膜的透明性也较低。
另外,本申请人等在WO2007/04231号公报中公开了一种管螺纹接头,其在销和套盒的螺纹部形成了无粘性的薄的润滑覆膜,该润滑覆膜是通过在显示出塑性或粘塑性型的流变特性(流动特性)的固体主体(matrix)中分散固体润滑剂颗粒而成的。主体的熔点优选在80~320℃的范围内,通过熔融状态下的喷涂(热熔喷雾法)、使用了粉末的喷镀、或水性乳剂的喷涂而形成。热熔法中使用的组合物例如含有聚乙烯作为热塑性聚合物,含有蜡(例如,巴西棕榈蜡)和金属皂(例如,硬脂酸锌)作为润滑成分,以及含有磺酸钙作为腐蚀抑制剂。该管螺纹接头还具有优异的润滑性能和耐腐蚀性。然而,由于覆膜不是透明的,因此,难以检查销的外表面螺纹有无损伤来防备由于销的外表面螺纹受到损伤而突然产生擦伤的这种情况。
WO2006/75774号公报中记载了一种管螺纹接头,其中,销和套盒中的至少一种构件的接触表面被由含有润滑性粉末和结合剂的固体润滑覆膜、以及形成于其上的不含固体颗粒的固体防腐蚀覆膜构成的2层覆膜所包覆。该管螺纹接头的耐腐蚀性非常高,但由于固体润滑覆膜是实质上不具有塑性或粘塑性型的流变特性的硬质的固体覆膜,因而即便形成于其上的固体防腐蚀覆膜在螺纹接头紧固时被破坏,其碎片也难以埋入到下方的固体润滑覆膜中,润滑性能略微降低。
发明内容
本发明提供一种在销和套盒上各形成有一层表面处理覆膜的管螺纹接头及其表面处理方法,该管螺纹接头在不使用复合油脂的情况下,可抑制锈的产生,显示出优异的耐磨损性和气密性,且表面不具有粘性,外观和检查性优异。
上述目的是通过以下方式而实现的:销的接触表面用以紫外线固化树脂作为主要成分的固体防腐蚀覆膜包覆,套盒的接触表面用具有塑性或粘塑性型的流变特性、在常压下不流动但在高压下能够流动的固体润滑覆膜(例如,由热熔型组合物形成)包覆。
本发明涉及一种管螺纹接头,其特征在于,该管螺纹接头由分别具备具有螺纹部和无螺纹金属接触部的接触表面的销和套盒构成,套盒的接触表面具有固体润滑覆膜作为最上层,所述固体润滑覆膜具有塑性或粘塑性型流变特性(plastic orviscoplastic rheological behavior),销的接触表面具有以紫外线固化树脂作为主要成分的固体防腐蚀覆膜作为最上层。
这里,“固体润滑覆膜”和“固体防腐蚀覆膜”是指该覆膜在常温下为固体,具体而言本发明中是指覆膜在40℃以下为固体。
在另一侧面,本发明涉及一种管螺纹接头的表面处理方法,其特征在于,其为由分别具备具有螺纹部和无螺纹金属接触部的接触表面的销和套盒构成的管螺纹接头的表面处理方法,在套盒的接触表面形成具有塑性或粘塑性型流变特性的固体润滑覆膜,在销的接触表面涂布以紫外线固化型树脂作为主要成分的组合物后,进行紫外线照射,从而形成固体防腐蚀覆膜。
作为本发明的优选方案,可列举出以下方案:
·所述固体防腐蚀覆膜由以紫外线固化树脂作为主要成分的2层以上构成;
·所述销的接触表面和套盒的接触表面中的至少一者通过选自喷砂处理、酸洗、磷酸盐化学转化处理、草酸盐化学转化处理、硼酸盐化学转化处理、金属镀覆、和将这些处理中的2种以上组合而成的复合处理中的方法预先进行了基底处理;
·所述固体润滑覆膜由熔融状态的组合物通过喷涂而形成;
·所述组合物含有热塑性聚合物、蜡、金属皂、和固体润滑剂;
·所述组合物还含有腐蚀抑制剂;
·所述组合物还含有腐蚀抑制剂和水不溶性液状树脂;
·所述固体防腐蚀覆膜除了含有紫外线固化树脂以外,还含有润滑剂、纤维状填料、和/或防锈剂;
·所述润滑剂为蜡;
·所述固体防腐蚀覆膜除了含有紫外线固化树脂以外,还含有选自颜料、染料、和荧光材料中的至少1种添加剂;
·所述管螺纹接头用于油井管的连结。
根据本发明,通过将销-套盒结构的管螺纹接头的一个元件即销的接触表面(螺纹部和无螺纹金属接触部)用以紫外线固化型树脂作为主要成分的固体防腐蚀覆膜包覆,将另一元件即套盒的接触表面用称为热熔型的、在高的表面压力下能够流动的具有塑性或粘塑性型的流变特性的固体润滑覆膜包覆,从而即使不涂布复合油脂,而仅通过在各接触表面各形成一层比较廉价的表面处理覆膜,就能够对管螺纹接头的接触表面赋予充分的耐腐蚀性和耐磨损性(润滑性)。
即,由于上述固体润滑覆膜在高压下能够流动,因而即便仅应用于套盒的接触表面,也显示出高润滑性能,即便在反复进行紧固和松开的情况下,也能够防止管螺纹接头的磨损。另一方面,由于形成于销的接触表面的以紫外线固化型树脂作为主要成分的固体防腐蚀覆膜是硬质的,因而在将具有该覆膜的销与具有上述润滑覆膜的套盒紧固时,不会对管螺纹接头的磨损性造成不良影响。
另外,以紫外线固化型树脂作为主要成分的固体防腐蚀覆膜的透明性高,因而不需除去表面处理覆膜就能检查容易受到外伤的销的螺纹部有无损伤,能够大幅度减轻连结操作前的螺纹检查的负担。
此外,固体防腐蚀覆膜自然不用说,具有上述流变特性的、例如通过热熔法形成的固体润滑覆膜的表面也不具有粘性,因此即便在螺纹接头连结前的期间螺纹接头的接触表面附着有锈、氧化皮(oxidized scale)、喷砂磨粒等异物,也能够利用鼓风等方法容易地只除去异物。其结果是,即便在严苛的润滑条件下,即由于接头连结时的组装不良所致的接头的偏芯、倾斜、异物的混入等导致局部表面压力过大而产生塑性变形时,也能够防止磨损。另外,还能够抑制螺纹连结时产生片状物。
附图说明
图1示意性地示出了钢管出厂时钢管与管接头的组装结构。
图2示意性地示出了管螺纹接头的紧固部。
图3是示出根据本发明形成于管螺纹接头的接触表面上的覆膜的说明图,图3(a)示出了接触表面自身的粗糙化实例,图3(b)示出了在接触表面形成了用于表面粗糙化的基底处理覆膜的实例。
具体实施方式
以下,详细说明本发明的管螺纹接头的实施方式。
图1示意性地示出了典型的管螺纹接头的组装结构,该管螺纹接头的组装结构表示出厂时的油井管用钢管与螺纹接头部件的状态。在某钢管A的两端形成在外表面具有阳螺纹部3a的销1,在螺纹接头部件(管接头)B的两侧形成在内表面具有阴螺纹部3b的套盒2。销是指形成于第1管状部件(图示例中为钢管)端部的具有阳螺纹的螺纹接头元件,套盒是指形成于第2管状部件(图示例中为管接头)端部的具有阴螺纹的螺纹接头元件。在钢管A的一端预先紧固管接头B。虽未图示,但在出厂前,在未紧固的钢管A的销与管接头B的套盒上安装有用于保护各个螺纹部的保护罩。保护罩在螺纹接头使用前拆除。
典型的情况下,如图所示,销形成于钢管的两端的外表面,套盒形成于作为其他部件的管接头的内表面。但反之,在原理上,也可以将钢管的两端的内表面制成套盒,将管接头的外表面制成销。另外,也存在不利用管接头而将钢管的一端制成销、将另一端制成套盒的整体(integral)螺纹接头。在这种情况下,第1管状部件为第1钢管,第2管状部件为第2钢管。本发明的管螺纹接头可以是这些中的任意一种。以下,以销形成于钢管两端的外表面、套盒形成于管接头的内表面的图1所示种类的管螺纹接头为例,对本发明进行说明。
图2示意性地示出了代表性的管螺纹接头的结构。管螺纹接头由形成于钢管A的端部的外表面的销1、和形成于管接头B的内表面的套盒2构成。销1包括阳螺纹部3a、位于钢管前端的金属密封面4a和扭矩台肩部5。与其相对应,套盒2具备阴螺纹部3b、其内侧的金属密封面4b和扭矩台肩部5。销和套盒的各自的金属密封面和扭矩台肩部构成无螺纹金属接触部。
销1和套盒2的各自的螺纹部3a、3b和金属密封面4a、4b以及扭矩台肩部5构成管螺纹接头的接触表面。该接触表面要求耐磨损性、气密性、耐腐蚀性。因此,以往一直涂布含有重金属粉末的复合油脂,但如前所述,由于人体和环境方面的问题、以及保管期间和异物附着导致的性能降低,实际使用中的耐磨损性能存在问题。另外,需要在紧固前检查螺纹部时洗掉复合油脂,并在检查后再次涂布。
根据本发明,如图3中的金属密封面所示,销的接触表面在钢基体30a上具备为了表面粗糙化而任选设置的基底处理层31a、和其上的以紫外线固化树脂作为主要成分的固体防腐蚀覆膜33。固体防腐蚀覆膜33可以由以紫外线固化树脂作为主要成分的2层以上构成。另一方面,套盒的接触表面在钢基体30b上具备为了表面粗糙化而任选设置的基底处理层31b、和其上的固体润滑覆膜32。本发明中,固体润滑覆膜为具有塑性或粘塑性型流变特性的覆膜。显示出这种流变特性的覆膜在常压下不流动,但在高压下能够流动。即,覆膜的流动性依赖于压力而显著变动。通过利用喷枪涂布热熔型的组合物、即含有热塑性聚合物的熔融状态的组合物,能够形成具有这种特性的覆膜。
另外,固体防腐蚀覆膜和固体润滑覆膜应该分别包覆销和套盒的接触表面的整个面,但本发明也包含用所述覆膜仅包覆销和/或套盒的接触表面的一部分(例如,只是无螺纹金属接触部)的情况。
[基底处理]
管螺纹接头的接触表面即螺纹部和无螺纹金属接触部通过包括切削螺纹在内的切削加工而形成,通常其表面粗糙度为3~5μm左右。若使接触表面的表面粗糙度大于该范围,则能够提高形成于其上的覆膜的密合性,结果能够改善耐磨损性和耐腐蚀性等性能。因此,优选的是,在覆膜形成之前,对于销和套盒中的至少一种构件、优选对两种构件的接触表面实施能够增大表面粗糙度的基底处理。
作为这种基底处理的实例,有:通过喷射形状为球状的喷砂材料(shot material)或形状为角状的研磨材料(grit material)等喷砂材料的喷砂处理;浸渍到硫酸、盐酸、硝酸、氢氟酸等强酸溶液中以使表面粗糙化的酸洗。这些处理是能够增大基体本身的表面粗糙度的处理。
作为其他基底处理的实例,可列举出磷酸盐化学转化处理、草酸盐化学转化处理、硼酸盐化学转化处理等化学转化处理、和金属镀覆。
化学转化处理通过形成由针状晶体构成的表面粗糙度大的化学转化覆膜,能够提高表面粗糙度,并提高形成于其上的固体防腐蚀覆膜和固体润滑覆膜的密合性。
金属镀覆能够提高耐磨损性,部分金属镀覆还能够增大表面粗糙度。作为能够增大表面粗糙度的金属镀覆,可列举出:利用电镀法镀铜、铁、它们的合金等的镀覆;锌或锌合金的冲击镀覆,即利用离心力或气压喷射在铁芯上包覆有锌或锌-铁合金等的颗粒,以形成堆积了锌或锌-铁合金颗粒的多孔的金属覆膜;以及,形成在金属中分散有固体微粒的覆膜的复合金属镀覆。
不管接触表面的基底处理为何种方法,都优选通过基底处理的表面粗糙化而使表面粗糙度Rz达5~40μm。若Rz不到5μm,则与形成于其上的覆膜的密合性不充分。另一方面,若Rz超过40μm,则表面的摩擦提高,形成于其上的覆膜不能承受受到高表面压力时的剪切力和压缩力,容易破损或剥离。用于表面粗糙化的基底处理可以并用2种以上的处理。另外,销和套盒可以实施不同的基底处理。
从固体防腐蚀覆膜或固体润滑覆膜的密合性的观点来看,优选为能够形成多孔覆膜的基底处理。尤其优选以使用了磷酸锰、磷酸锌、磷酸铁锰、或磷酸锌钙的磷酸盐处理以及利用冲击镀覆来形成锌或锌-铁合金的覆膜作为基底处理。从其上形成的覆膜的密合性的观点来看,优选为磷酸锰覆膜,从耐腐蚀性的观点来看,优选为通过锌形成能够期待牺牲腐蚀保护(sacrificial corrosion protective)的锌或锌-铁合金的覆膜。
作为固体润滑覆膜的基底处理而尤其优选的是磷酸锰化学转化处理,作为固体防腐蚀覆膜的基底处理而尤其优选的是磷酸锌化学转化处理以及利用冲击镀覆的锌或锌-铁合金镀覆。
通过磷酸盐处理形成的覆膜与通过冲击镀覆形成的锌或锌-铁合金的覆膜均为多孔的覆膜。若在其上形成固体防腐蚀覆膜或固体润滑覆膜,则通过多孔覆膜的所谓“锚固效果”而使覆膜的密合性提高。其结果是,即便反复进行紧固和松开也不易产生固体润滑覆膜的剥离,可有效防止金属间的直接接触,进一步提高耐磨损性、气密性、耐腐蚀性。
磷酸盐处理可以根据常规方法通过浸渍或喷雾而实施。作为处理液,可以使用在镀锌用之前使用的一般性的酸性磷酸盐处理液。例如,可列举出包括磷酸离子1~150g/L、锌离子3~70g/L、硝酸离子1~100g/L、镍离子0~30g/L的磷酸锌系化学转化处理液。另外,还可以使用在管螺纹接头中惯用的磷酸锰系化学转化处理液。液体温度可以从常温至100℃,处理时间根据所期望的膜厚而可以在15分钟之内进行。为了促进成膜,可以在磷酸盐处理前向处理表面供给含有胶体钛的表面调节用水溶液。优选在磷酸盐处理后进行冷水洗或热水洗、然后干燥。
冲击镀覆可以通过使颗粒与被镀覆物在转筒内进行冲击的机械镀覆、或利用喷砂装置而使颗粒冲击被镀覆物的喷镀来实施。本发明中,只对接触表面实施镀覆即可,因而优选采用能够进行局部镀覆的喷镀(blast plating)。
例如,对所要包覆的接触表面喷射由颗粒构成的喷射材料,所述颗粒通过用锌或锌合金(例如,锌-铁合金)包覆铁系的核的表面而成。颗粒中的锌或锌合金的含量优选在20~60质量%的范围,颗粒的粒径优选在0.2~1.5mm的范围。通过喷射,只有作为颗粒的包覆层的锌或锌合金附着于作为底面(substrate)的接触表面,在接触表面上形成由锌或锌合金构成的多孔的覆膜。该喷镀不论钢的材质为何种均能够在钢表面形成密合性良好的镀覆膜。
从耐腐蚀性和密合性这两个方面来看,由冲击镀覆形成的锌或锌合金层的厚度优选为5~40μm。若不到5μm,则可能无法确保充分的耐腐蚀性。另一方面,若超过40μm,则形成于其上的覆膜的密合性反而可能会降低。同样地,磷酸盐覆膜的厚度也优选在5~40μm的范围。
另外,尤其在用作形成固体润滑覆膜前的基底的情况下,也可以采用对于提高耐磨损性有效的表面处理法。例如,金属或合金形成的1层或2层以上的镀层对于耐磨损性的改善是有效的。作为这种镀覆的实例,可列举出Cu、Sn、或Ni金属形成的单层镀覆;以及日本特开2003-74763号公报中记载的Cu-Sn合金形成的单层镀覆;Cu层与Sn层的双层镀覆;以及利用Ni、Cu、Sn各层的三层镀覆。对于由Cr含量为5%以上的钢构成的钢管,优选为Cu-Sn合金镀覆、镀Cu-镀Sn的双层镀覆、镀Ni-镀Cu-镀Sn的三层镀覆。更优选为镀Cu-镀Sn的双层镀覆、以及冲击镀Ni-镀Cu-镀Sn的三层镀覆、Cu-Sn-Zn的合金镀覆。这样的金属或金属合金镀覆可以根据日本特开2003-74763号公报中记载的方法来实施。无论管螺纹接头的钢种(碳钢、合金钢、高合金钢)是何种,优选的镀覆均是以总计5~15μm的厚度在Ni冲击镀层上形成Cu镀层、或Cu-Sn的合金镀层、或Cu-Sn-Zn的合金镀层的镀覆。期待在更严苛的使用环境中的耐磨损性时等,利用最优选的镀覆进行的基底处理是在Ni冲击镀层上实施Cu-Sn-Zn的合金镀覆。
[固体防腐蚀覆膜]
对于销的接触表面,优选的是,在如上所述那样实施了基底处理后,尤其优选在利用磷酸锌化学转化处理或者通过形成锌或锌-铁合金多孔镀覆膜的冲击镀覆而实施基底处理后,形成以紫外线固化树脂为主要成分的固体防腐蚀覆膜来作为最表层。
关于图1,如上所述,管螺纹接头在实际使用前,多在未进行紧固的销和套盒上安装有保护罩。对于固体防腐蚀覆膜至少有以下要求:覆膜不会因安装保护罩时所施加的力而容易破损;在运送或保管中,即使暴露于由于露点的关系而冷凝的水中也不溶解;即使在超过40℃的高温下也不易软化。
本发明中,作为满足这种性质的覆膜,由已知能够形成高强度覆膜的、以紫外线固化树脂作为主要成分的组合物来形成固体防腐蚀覆膜。作为紫外线固化树脂,可以使用至少由单体、低聚物、光聚合引发剂构成的公知的树脂组合物。只要是通过照射紫外线而引起光聚合反应、从而形成固化覆膜的组合物即可,紫外线固化树脂组合物的成分和组成没有特别限定。
作为单体,可列举出多元醇与(甲基)丙烯酸的多元(二或三以上)酯、以及各种(甲基)丙烯酸酯化合物、N-乙烯基吡咯烷酮、N-乙烯基己内酰胺和苯乙烯,但不限于此。作为低聚物,可列举出(甲基)丙烯酸环氧酯、(甲基)丙烯酸氨基甲酸酯、聚酯(甲基)丙烯酸酯、聚醚(甲基)丙烯酸酯、和硅酮(甲基)丙烯酸酯,但不限于此。
有用的光聚合引发剂为在260~450nm的波长处具有吸收的化合物,作为实例,可列举出苯偶姻及其衍生物、二苯甲酮及其衍生物、苯乙酮及其衍生物、米氏酮、苯偶酰及其衍生物、单硫代四烷基秋兰姆、噻噁烷类等。尤其优选使用噻噁烷类。
从其滑动性、覆膜强度、耐腐蚀性的观点来看,由紫外线固化树脂形成的固体防腐蚀覆膜可以在覆膜中含有选自润滑剂、纤维状填料、和防锈剂中的添加剂。
润滑剂的实例为蜡、硬脂酸钙或硬脂酸锌那样的金属皂和聚四氟乙烯(PTFE)树脂。纤维状填料的实例为Maruo Calcium公司制造的“whiscal”那样的针状碳酸钙。以质量比计,相对于1紫外线固化树脂,可以添加0.05~0.35的量(2种以上的情况下为总计量)的选自这些润滑剂和纤维状填料中的1种或2种以上的物质。若为0.05以下,则目标覆膜强度、滑动性的改善可能会不充分。另一方面,若超过0.35,则涂布液的粘度升高,涂布操作性降低,反而可能会导致覆膜强度降低。
防锈剂的实例为三聚磷酸铝、亚磷酸铝等。以质量比计,相对于1紫外线固化树脂,最大可以添加0.10左右的这些添加剂。
由紫外线固化树脂形成的固体防腐蚀覆膜多为透明的。从可容易地利用目视或图像处理来检查所形成的固体防腐蚀覆膜的品质(有无覆膜、覆膜厚度的均匀性/不均等的检查)的观点来看,固体防腐蚀覆膜可以含有用于形成在可见光下或在紫外线下着色的覆膜的至少1种添加剂。所使用的添加剂可以从颜料、染料、和荧光材料中选择。荧光材料有时在可见光下不将覆膜着色,但至少在紫外线下使覆膜发光、着色。这些添加剂可以使用市售品,只要能够通过目视或图像处理来检查固体防腐蚀覆膜的品质即可,没有特别限定。还可以使用有机和无机中的任何材料。
若添加颜料,则固体防腐蚀覆膜的透明性降低或丧失。若固体防腐蚀覆膜为不透明的,则难以检查基底的销螺纹部有无损伤。因此,在使用颜料的情况下,优选为黄色、白色等明度高的颜色的颜料。从防腐蚀性的观点来看,颜料的粒径越小越好,优选使用平均粒径为5μm以下的颜料。染料由于不会大大降低固体防腐蚀覆膜的透明性,因而即便是例如红、蓝等较强颜色的染料也没有影响。以质量比计,相对于1紫外线固化树脂,优选颜料和染料的添加量最大为0.05。若超过0.05,则防腐蚀性可能降低。更优选的添加量为0.02以下。
荧光材料可以是在荧光颜料、荧光染料、和荧光涂料中使用的荧光体的任一种。荧光颜料大致可分为无机荧光颜料和日光荧光颜料。
无机荧光颜料有例如硫化锌或硫化锌镉系(含有金属活化剂)、卤化磷酸钙系、稀土类活化的锶氯磷灰石系等,多将它们中的2种以上混合使用。无机荧光颜料具有优异的耐候性、耐热性。
日光荧光颜料也有若干种,但其主流为在无色的合成树脂中含有荧光染料而颜料化的合成树脂固溶体型的日光荧光颜料。也可以使用荧光染料本身。另外,荧光涂料、荧光印刷油墨中也使用各种无机或有机荧光颜料、尤其是合成树脂固溶体型的荧光颜料,可以使用它们中所含的荧光体作为荧光颜料或荧光染料。
含有荧光材料的固体防腐蚀覆膜在可见光下为无色或有色的透明覆膜,但在照射黑光或紫外线时会发光、显色,因而能够确认覆膜的有无和覆膜厚度的不均等。另外,由于在可见光下是透明的,因而能够观察固体防腐蚀覆膜下方的基体、即销表面。因此,销螺纹部的损伤检查不会受到固体防腐蚀覆膜的阻碍。
以质量比计,相对于1紫外线固化树脂,固体防腐蚀覆膜中的荧光材料的添加量最大优选为0.05左右。若超过0.05,则防腐蚀性可能会降低。更优选的质量比为0.02以下。
为了能够对固体防腐蚀覆膜以及对基底的销螺纹部的品质进行管理,作为覆膜着色用添加剂,优选使用荧光材料、尤其是荧光颜料。
在将以紫外线固化树脂作为主要成分的组合物(包括仅由紫外线固化树脂构成的组合物)涂布到销的接触表面后,照射紫外线而使覆膜固化,从而形成以紫外线固化树脂作为主要成分的固体防腐蚀覆膜。
可以通过反复进行涂布和紫外线照射,形成由2层以上的紫外线固化树脂层构成的固体防腐蚀覆膜。若使固体防腐蚀覆膜如此进行多层化,则覆膜强度进一步提高,即便因管螺纹接头的紧固时所施加的力,固体防腐蚀覆膜也不会破损,进一步改善了管螺纹接头的耐腐蚀性。本发明中,由于在固体防腐蚀覆膜下不存在润滑覆膜,因而在管螺纹接头的紧固中没有必要破坏固体防腐蚀覆膜,固体防腐蚀覆膜没有被破坏者的管螺纹接头的耐腐蚀性较高。
紫外线的照射可以使用通常市售的在200~450nm区域具有输出波长的紫外线照射装置。作为紫外线的照射源,可列举出例如高压汞灯、超高压汞灯、氙灯、碳弧灯、金属卤化物灯、日光等。本领域技术人员可以适当设定照射时间和照射紫外线强度。
固体防腐蚀覆膜的膜厚(在由2层以上的紫外线固化树脂层构成的情况下,为总计膜厚)优选在5~50μm的范围内,更优选在10~40μm的范围内。另外,优选比形成在对应构件上的固体润滑覆膜的膜厚更小。若固体防腐蚀覆膜的膜厚过薄,则可能无法作为防腐蚀覆膜充分发挥功能,管螺纹接头的耐腐蚀性可能不充分。另一方面,若固体防腐蚀覆膜的膜厚大于50μm,则如图1所示,在对油井管安装简单、气密性高的保护罩等保护构件时,固体防腐蚀覆膜可能会因安装保护罩时的力而破损,管螺纹接头的耐腐蚀性依然不充分。另外,此时由于形成摩耗粉而被排出到环境中,因而操作环境恶劣。另外,若固体防腐蚀覆膜的膜厚比对应构件的固体润滑覆膜的膜厚大,则可能有损润滑覆膜的润滑性能。
以紫外线固化树脂作为主要成分的固体防腐蚀覆膜多为透明覆膜,因而不除去覆膜也能够观察基体的状态,能够从覆膜的上方实施紧固前的螺纹部的检查。因此,通过在螺纹外表面形成且在更容易受到损伤的销的接触表面形成该固体防腐蚀覆膜,能够以保持覆膜的状态简便地检查销的螺纹部有无损伤。
[固体润滑覆膜]
为了防止在利用管螺纹接头进行钢管之间的连结时的磨损,而在管螺纹接头的套盒的接触表面形成固体润滑覆膜。本发明中,该固体润滑覆膜不是将固体润滑剂分散到热固性树脂的主体中而成的一般性的硬质覆膜,而是以热熔型的覆膜为代表的在室温下显示出塑性或粘塑性的流变特性的覆膜。
这种固体润滑覆膜在前述的WO2007/04231号公报中有记载,是将少量的固体润滑剂分散到具有塑性或粘塑性型流变特性的主体中而成的覆膜。如该专利文献中所记载的那样,也可以通过利用水性乳剂的涂布和干燥的方法、或喷镀法来形成这种固体润滑覆膜。然而,优选的固体润滑覆膜的形成方法为喷涂熔融状态的组合物的方法。
优选的固体润滑覆膜由70~95质量%主体、5~30质量%固体润滑剂构成。由于固体润滑剂的比例如此少量,因而覆膜整体显示出主体的特性即塑性或粘塑性型的流变特性。
该固体润滑覆膜的主体(在室温下具有塑性或粘塑性型流变特性)的熔点优选在80~320℃的范围。由此,通过利用惯用的喷枪喷涂处于主体熔点以上的温度下而呈熔融状态的组合物,能够在套盒的接触表面形成固体润滑覆膜。
该主体优选由热塑性聚合物、蜡、和金属皂构成,更优选进一步含有腐蚀抑制剂和水不溶性液状树脂。
主体中使用的热塑性聚合物优选为聚乙烯。由于聚乙烯的熔点比较低,因而能够在150℃以下的温度下处于热熔状态而进行喷涂,且所形成的覆膜的润滑性优异。
本发明中,金属皂是指高级脂肪酸(碳原子数12以上的脂肪酸)与碱金属以外的金属的盐。金属皂可发挥捕捉在管螺纹接头的紧固或松开时产生的碎片、并抑制其排出到外部环境的作用。另外,还可发挥使覆膜易于滑动、降低摩擦系数、提高润滑性能的作用。此外,在盐水喷雾试验中,金属皂还具有延迟腐蚀产生时间的腐蚀抑制效果。优选的金属皂为硬脂酸锌和硬脂酸钙。
蜡也可以发挥与金属皂同样的功能。因此,可以在固体润滑覆膜中仅含有金属皂和蜡中的任意一种,但由于在固体润滑覆膜中含有金属皂和蜡这两者时能够提高覆膜的润滑性能,因而优选含有这两者。由于蜡的熔点较低,因而具有降低组合物的熔点以及因此而降低喷涂温度的优点。
蜡可以是动物性、植物性、矿物性和合成蜡中的任一种。作为能够使用的蜡,有蜂蜡、鲸蜡(以上,动物性);木蜡、巴西棕榈蜡、小烛树蜡、米糠蜡(以上,植物性);石蜡、微晶蜡、石油脂(petrolatum)、褐煤蜡、地蜡(ozokerite)、白蜡(ceresine)(以上,矿物性);氧化蜡、聚乙烯蜡、Fischer-Tropsch蜡、酰胺蜡、氢化蓖麻油(蓖麻蜡)(以上,合成蜡)等。尤其优选的是巴西棕榈蜡,但也可以使用其他蜡。
关于蜡与金属皂的质量比,相对于1金属皂,蜡优选在0.5~3的范围内,该质量比更优选为0.5~2,最优选约为1。
作为腐蚀抑制剂,一直以来作为腐蚀抑制剂添加在润滑油中的各种腐蚀抑制剂由于润滑性能优异而优选。作为这种腐蚀抑制剂的代表例,可列举出Lubrizol公司以AloxTM 606的商品名市售的磺酸钙衍生物、Halox公司以HaloxTM SZP-391的商品名市售的磷硅酸锶锌(Strontium zinc phosphosilicate)、以及KingIndustries,Inc.制的NA-SULTM Ca/W1935等。固体润滑覆膜通过含有腐蚀抑制剂,即便其上不形成固体防腐蚀覆膜,仅以固体润滑覆膜也能够在某种程度上防止接触表面的腐蚀。因此,固体润滑覆膜中优选至少含有5质量%的腐蚀抑制剂。
水不溶性的液状树脂(室温下为液状的树脂)可发挥提高组合物在熔融状态下的流动性、减少喷涂的故障的作用。如果配合少量液状树脂,则固体润滑覆膜不会产生粘性。优选的液状树脂可选自聚甲基丙烯酸烷基酯、聚丁烯、聚异丁烯、和聚二烷基硅氧烷(液状硅酮树脂,例如聚二甲基硅氧烷)。另外,液状的聚二烷基硅氧烷也作为表面活性剂发挥作用。
除上述物质以外,主体还能含有少量选自表面活性剂、着色剂、抗氧化剂等中的添加成分。此外,如果是2质量%以下的极少量,主体中也能够含有极压剂、液状油剂等。
优选的固体润滑覆膜的主体的组成例(质量%)如下所示:
各成分均能使用2种以上的材料。
优选的固体润滑覆膜的主体的更具体的组成例(质量%)如下所示。
固体润滑剂是指具有润滑性的粉末。固体润滑剂大致分为:
(1)通过具有易于滑动的特定的晶体结构、例如六方晶层状晶体结构而显示润滑性的物质(例如,石墨、氧化锌、氮化硼);
(2)通过晶体结构以及具有反应性元素而显示润滑性的物质(例如,二硫化钼、二硫化钨、氟化石墨、硫化锡、硫化铋),
(3)通过化学反应性而显示润滑性的物质(例如,某些种类的硫代硫酸盐型化合物),和
(4)通过摩擦应力下的塑性或粘塑性特性而显示润滑性的物质(例如,聚四氟乙烯<PTFE>和聚酰胺)。
这些中的任何一种均可使用,但优选的是(2)。(2)的固体润滑剂可以单独使用,但更优选在其中组合(1)和/或(4)的固体润滑剂来使用。然而,由于二硫化钼的热稳定性稍低,另外石墨可能会促进腐蚀,因而优选使用这些以外的物质。
固体润滑覆膜除了含有固体润滑剂以外,还可以含有用于调节滑动性的无机粉末。这种无机粉末的实例有二氧化钛和氧化铋。在固体润滑覆膜中可以含有20质量%以下量的该无机粉末。
固体润滑覆膜的形成优选通过热熔法进行。该方法如下进行:将涂布用组合物(含有上述主体和固体润滑剂粉末)加热,使主体熔融,从一定温度(通常为与熔融状态的组合物的温度相同的温度)的具有温度保持功能的喷枪中喷雾熔融状态的组合物(当然,仅主体熔融)。组合物的加热温度优选为比主体的熔点高10~50℃的温度。
被涂布的底面(即,套盒的接触表面)也优选预先预热到比主体的熔点更高的温度。由此能够获得良好的包覆性。或者,在涂布用组合物含有少量(例如,2质量%以下)聚二甲基硅氧烷这样的表面活性剂的情况下,即便不将底面预热、或者预热温度低于主体的熔点,也能够形成良好的覆膜。
涂布组合物在具备适当的搅拌装置的罐内加热而熔融,利用压缩器经由计量泵而供给到喷枪的喷雾头(保持在规定温度)中,向底面喷雾。罐内和喷雾头的保持温度根据组合物中的主体的熔点而调整。
固体润滑覆膜的膜厚优选在10~150μm的范围内,更优选在25~80μm的范围内。若固体润滑覆膜的膜厚过小,则当然管螺纹接头的润滑性不够,在紧固时或松开时容易产生磨损。另外,该固体润滑覆膜还具备一定程度的防腐蚀性,但若膜厚过小,则防腐蚀性也不充分,套盒的接触表面的耐腐蚀性降低。
另一方面,若固体润滑覆膜的膜厚过大,则不仅会造成润滑剂的浪费,还会与本发明的目的之一即防止环境污染相违背。另外,根据情况,也有可能在紧固时产生滑动而难以进行紧固。
在固体润滑覆膜和固体防腐蚀覆膜均形成于通过基底处理而增大了表面粗糙度的接触表面上时,优选形成大于基底的Rz的膜厚。若不这样的话,可能无法完全包覆基底。基底为粗糙面时的膜厚,是能够由覆膜的面积、质量和密度算出的覆膜整体膜厚的平均值。
通过以下的实施例来证明本发明的效果。另外,以下,将包括销的螺纹部和无螺纹金属接触部的接触表面称为“销表面”,将包括套盒的螺纹部和无螺纹金属接触部的接触表面称为“套盒表面”。表面粗糙度为Rz。实施例中的%只要没有特别说明则为质量%。
实施例1
如下所述对碳钢(C:0.21%、Si:0.25%、Mn:1.1%、P:0.02%、S:0.01%、Cu:0.04%、Ni:0.06%、Cr:0.17%、Mo:0.04%)制的管螺纹接头(外径:17.78cm(7英寸)、壁厚:1.036cm(0.408英寸)的销表面和套盒表面实施表面处理。
销表面在机械磨削加工(表面粗糙度3μm)后、在75~85℃的磷酸锌用化学转化处理液中浸渍10分钟,形成厚度8μm的磷酸锌覆膜(表面粗糙度8μm)。进而,在其上涂布市售的紫外线固化型树脂覆膜形成用组合物(ThreeBond公司制的ThreeBond3113B,以环氧树脂作为主要成分的无溶剂型的紫外线固化性树脂涂料),以下述条件照射紫外线而使覆膜固化,形成厚度25μm的紫外线固化型树脂覆膜。该覆膜是无色透明的,能够从覆膜的上方利用肉眼或放大镜检查销的阳螺纹部。
紫外线照射条件:
UV灯:气冷汞灯(air-cooled mercury vapor lamp),
UV灯功率:4kW,
紫外线波长:260nm。
套盒表面在机械磨削加工(表面粗糙度3μm)后、在80~95℃的磷酸锰化学转化处理液中浸渍10分钟,形成厚度12μm的磷酸锰覆膜(表面粗糙度10μm)。将具有下述组成的润滑覆膜形成用组合物在具备搅拌机的罐内加热至150℃,形成具有适于涂布的粘度的熔融状态,另一方面,如上所述那样进行了基底处理的套盒表面也通过感应加热而预热至130℃后,通过具有具备保温功能的喷雾头的喷枪,涂布熔融状态的润滑覆膜形成用组合物。冷却后,形成厚度35μm的固体润滑覆膜。
润滑覆膜形成用组合物的组成:
·聚乙烯均聚物(CLARIANT公司制LICOWAXTM PE520):9%,
·巴西棕榈蜡:15%,
·硬脂酸锌:15%,
·液状聚甲基丙烯酸烷基酯(ROHMAX公司制VISCOPLEXTM 6-950):5%,
·腐蚀抑制剂(LUBRIZOL公司制ALOXTM 606):40%,
·氟化石墨:3.5%,
·氧化锌:1%,
·二氧化钛:5%,
·三氧化铋:5%,
·硅酮(聚二甲基硅氧烷):1%,以及
·抗氧化剂(Ciba-Geigy公司制)
IRGANOXTM L150:0.3%和
IRGAFOSTM 168:0.2%。
使用销和套盒进行了上述表面处理的螺纹接头,以紧固速度10rpm、紧固扭矩20kN·m反复进行10次紧固和松开。调查在第10次的紧固后松开的销和套盒的接触表面的磨损状况。其结果,在10次的紧固·松开中,没有产生磨损,状况非常良好。
实施例2
如下所述对与实施例1中使用的管螺纹接头相同的碳钢制的管螺纹接头的销表面和套盒表面实施表面处理。
销表面在机械磨削加工(表面粗糙度3μm)后、在75~85℃的磷酸锌用化学转化处理液中浸渍10分钟,形成厚度8μm的磷酸锌覆膜(表面粗糙度8μm)。在其上涂布对中国涂料(株)制的环氧丙烯酸树脂系紫外线固化性树脂涂料(无溶剂型)添加了防锈剂亚磷酸铝和润滑剂聚乙烯蜡调制而成的组合物(以质量%计,树脂成分94%,防锈剂5%,润滑剂1%),以下述条件照射紫外线而使覆膜固化,形成厚度25μm的紫外线固化型树脂覆膜。所形成的覆膜是无色透明的,能够从覆膜的上方利用肉眼或放大镜检查销的阳螺纹部。
紫外线照射条件:
UV灯:气冷汞灯,
UV灯功率:4kW,
紫外线波长:260nm。
套盒表面在机械磨削加工(表面粗糙度3μm)后、利用电镀首先实施冲击镀Ni、然后镀覆Cu-Sn-Zn合金,形成总计8μm厚的镀覆膜。将具有下述组成的润滑覆膜形成用组合物在具备搅拌机的罐内加热至120℃,形成具有适于涂布的粘度的熔融状态,另一方面,如上所述那样进行了基底处理的套盒表面也通过感应加热而预热至120℃后,通过具有具备保温功能的喷雾头的喷枪,涂布熔融状态的润滑覆膜形成用组合物。冷却后,形成厚度50μm的固体润滑覆膜。
润滑覆膜形成用组合物的组成:
·聚乙烯均聚物(CLARIANT公司制LICOWAXTM PE520):9%,
·巴西棕榈蜡:15%,
·硬脂酸锌:15%,
·液状聚甲基丙烯酸烷基酯(ROHMAX公司制VISCOPLEXTM 6-950):5%,
·腐蚀抑制剂(King Industries,Inc.的NA-SUL(R)Ca/W1935):40%,
·氟化石墨:3.5%,
·氧化锌:1%,
·二氧化钛:5%,
·三氧化铋:5%,
·硅酮(聚二甲基硅氧烷):1%,以及
·抗氧化剂(Ciba-Geigy公司制)
IRGANOXTM L150:0.3%和
IRGAFOSTM 168:0.2%。
使用销和套盒进行了上述表面处理的螺纹接头,以紧固速度10rpm、紧固扭矩20kN·m反复进行10次紧固和松开。调查在第10次的紧固后松开的销和套盒的接触表面的磨损状况。其结果,在10次的紧固/松开中,没有产生磨损,状况非常良好。
实施例3
如下所述对13Cr钢(C:0.19%、Si:0.25%、Mn:0.9%、P:0.02%、S:0.01%、Cu:0.04%、Ni:0.11%、Cr:13%、Mo:0.04%)制的管螺纹接头(外径:24.448cm(9-5/8英寸)、壁厚:1.105cm(0.435英寸)的销表面和套盒表面实施表面处理。
在机械磨削加工(表面粗糙度3μm)后,对销表面涂布在与实施例2中使用的紫外线固化型涂料相同的紫外线固化型涂料中添加了防锈剂亚磷酸铝、润滑剂聚乙烯蜡和覆膜着色用的荧光颜料调制而成的组合物(以质量%计,含有防锈剂5%、润滑剂1%、荧光颜料0.3%,剩余部分为树脂成分),以下述条件照射紫外线而使覆膜固化,形成厚度25μm的紫外线固化型树脂覆膜。所形成的覆膜是无色透明的,能够从覆膜的上方利用肉眼或放大镜检查销的阳螺纹部。另外,在照射紫外线的情况下,覆膜发出黄色的光,因而能够容易地观察覆膜的形成状况,确认到覆膜均匀地形成而没有不均。
紫外线照射条件:
UV灯:气冷汞灯,
UV灯功率:4kW,
紫外线波长:260nm。
套盒表面在机械磨削加工(表面粗糙度3μm)后、利用电镀首先实施冲击镀Ni、然后实施Cu-Sn-Zn合金镀覆,形成总计8μm厚的镀覆膜。将具有下述组成的润滑覆膜形成用组合物在具备搅拌机的罐内加热至150℃,形成具有适于涂布的粘度的熔融状态,另一方面,如上所述那样进行了基底处理的套盒表面也通过感应加热而预热至150℃后,通过具有具备保温功能的喷雾头的喷枪,涂布熔融状态的润滑覆膜形成用组合物。冷却后,形成厚度40μm的固体润滑覆膜。
润滑覆膜形成用组合物的组成:
·聚乙烯均聚物(CLARIANT公司制LICOWAXTM PE520):10%,
·嵌段共聚物-(Resine Dertolyne P2L):15%,
·巴西棕榈蜡:7%,
·硬脂酸锌:25%,
·液状聚甲基丙烯酸烷基酯(ROHMAX公司制VISCOPLEXTM 6-950):8%,
·腐蚀抑制剂(Halox(R)SZP-391):15%,
·氟化石墨:7%,
·PTFE:2%,
·氮化硼:1%,
·增粘剂(Displerplast):5%,
·微晶蜡(Micro Powders公司制Polyfluo(R)440Xn):5%。
使用销和套盒进行了上述表面处理的螺纹接头,以紧固速度10rpm、紧固扭矩20kN·m反复进行10次紧固和松开。调查在第10次的紧固后松开的销和套盒的接触表面的磨损状况。其结果,在10次的紧固/松开中,没有产生磨损,状况非常良好。
关于作为管螺纹接头所必需的防锈性,进行如下评价:对另外准备的相同钢种的试样试验片(70mm×150mm×2mm厚)进行与上述各实施例中分别形成于套盒表面或销表面的处理同样的表面处理(基底处理和固体润滑覆膜或固体防腐蚀覆膜的形成),并实施湿热试验(humidity test)(温度50℃、湿度98%、200小时)。其结果,所有情况下均没有确认到锈的产生。
以上,关于目前认为优选的方式,对本发明进行了说明,但本发明不限于以上公开的方式。只要不与从权利要求和说明书整体理解的本发明的技术思想相违背,则可以进行变更,进行了这种变更的螺纹接头也包含在本发明的范围内。
例如,上述实施例中对外径7英寸的管螺纹接头进行了说明,但已经验证:在2-3/8英寸~14英寸的外径、碳钢类中的13Cr钢、以及高合金钢(例如,25Cr钢)的钢种、各种螺纹型(住友金属工业株式会社制的VAM Connection,VAMTOP系列等)中也可获得同样的效果。
Claims (20)
1.一种管螺纹接头,其特征在于,该管螺纹接头由分别具备具有螺纹部和无螺纹金属接触部的接触表面的销和套盒构成,套盒的接触表面仅具有固体润滑覆膜作为最上层,所述固体润滑覆膜具有塑性或粘塑性型流变特性,销的接触表面具有在基体上任选设置的基底处理层、且仅具有以紫外线固化树脂作为主要成分的透明的固体防腐蚀覆膜作为最上层。
2.根据权利要求1所述的管螺纹接头,所述固体防腐蚀覆膜由2层以上的紫外线固化树脂层构成。
3.根据权利要求1或2所述的管螺纹接头,所述销的接触表面和套盒的接触表面中的至少一者通过选自喷砂处理、酸洗、磷酸盐化学转化处理、草酸盐化学转化处理、硼酸盐化学转化处理、金属镀覆、和将这些处理中的2种以上组合而成的复合处理中的方法预先实施了基底处理。
4.根据权利要求1~3中任一项所述的管螺纹接头,所述固体润滑覆膜由熔融状态的组合物通过喷涂而形成。
5.根据权利要求4所述的管螺纹接头,所述组合物含有热塑性聚合物、蜡、金属皂、和固体润滑剂。
6.根据权利要求5所述的管螺纹接头,所述组合物还含有腐蚀抑制剂。
7.根据权利要求5所述的管螺纹接头,所述组合物还含有腐蚀抑制剂和水不溶性液状树脂。
8.根据权利要求1~7中任一项所述的管螺纹接头,所述固体防腐蚀覆膜除了含有紫外线固化树脂以外,还含有选自润滑剂、纤维状填料和防锈剂中的至少1种添加成分。
9.根据权利要求8所述的管螺纹接头,所述润滑剂为蜡。
10.根据权利要求1~9中任一项所述的管螺纹接头,其用于油井管的连结。
11.一种管螺纹接头的表面处理方法,其特征在于,所述管螺纹接头由分别具备具有螺纹部和无螺纹金属接触部的接触表面的销和套盒构成,在套盒的接触表面,仅形成具有塑性或粘塑性型流变特性的固体润滑覆膜作为最上层,对销的接触表面任选实施基底处理,接着涂布以紫外线固化型树脂作为主要成分的组合物后,进行紫外线照射,从而仅形成透明的固体防腐蚀覆膜。
12.根据权利要求11所述的方法,所述固体防腐蚀覆膜的形成包括以下步骤:反复进行以紫外线固化型树脂作为主要成分的组合物的涂布以及之后的紫外线照射,从而形成2层以上的紫外线固化树脂层。
13.根据权利要求11或12所述的方法,所述销的接触表面和套盒的接触表面中的至少一者为通过选自喷砂处理、酸洗、磷酸盐化学转化处理、草酸盐化学转化处理、硼酸盐化学转化处理、金属镀覆、和将这些方法中的2种以上组合而成的复合处理中的方法实施了基底处理而成的表面。
14.根据权利要求11~13中任一项所述的方法,所述固体润滑覆膜的形成由熔融状态的组合物通过喷涂而进行。
15.根据权利要求14所述的方法,所述组合物含有热塑性聚合物、蜡、金属皂、和固体润滑剂。
16.根据权利要求15所述的方法,所述组合物还含有腐蚀抑制剂。
17.根据权利要求15所述的方法,所述组合物还含有腐蚀抑制剂和水不溶性液状树脂。
18.根据权利要求11~17中任一项所述的方法,所述固体防腐蚀覆膜的形成(形成2层以上的紫外线固化树脂层时至少一层紫外线固化树脂层的形成)中所使用的组合物除了含有紫外线固化树脂以外,还含有选自润滑剂、纤维状填料和防锈剂中的至少1种添加成分。
19.根据权利要求18所述的方法,所述润滑剂为蜡。
20.根据权利要求11~19中任一项所述的方法,所述固体防腐蚀覆膜的形成(形成2层以上的紫外线固化树脂层时至少一层紫外线固化树脂层的形成)中所使用的组合物含有选自颜料、染料、和荧光材料中的至少1种添加剂。
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WO2024043131A1 (ja) * | 2022-08-25 | 2024-02-29 | Jfeスチール株式会社 | 固体潤滑被膜形成用の薬剤、薬剤の製造方法、薬剤の塗布方法、油井管、及び油井管ねじ継手 |
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2008
- 2008-12-02 AU AU2008332419A patent/AU2008332419B2/en active Active
- 2008-12-02 CN CN201410510815.4A patent/CN104482334A/zh active Pending
- 2008-12-02 WO PCT/JP2008/071856 patent/WO2009072486A1/ja active Application Filing
- 2008-12-02 MX MX2010006072A patent/MX2010006072A/es active IP Right Grant
- 2008-12-02 PL PL08857920T patent/PL2216576T3/pl unknown
- 2008-12-02 JP JP2009544674A patent/JP5124887B2/ja active Active
- 2008-12-02 EA EA201070682A patent/EA017703B1/ru not_active IP Right Cessation
- 2008-12-02 CA CA2706770A patent/CA2706770C/en active Active
- 2008-12-02 NO NO08857920A patent/NO2216576T3/no unknown
- 2008-12-02 EP EP08857920.6A patent/EP2216576B1/en active Active
- 2008-12-02 MY MYPI2010002541A patent/MY161993A/en unknown
- 2008-12-02 CN CN2008801261904A patent/CN101939579A/zh active Pending
- 2008-12-02 BR BRPI0820002A patent/BRPI0820002B1/pt not_active IP Right Cessation
- 2008-12-03 AR ARP080105270A patent/AR069560A1/es active IP Right Grant
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2010
- 2010-05-31 EG EG2010050906A patent/EG26045A/en active
- 2010-06-04 US US12/793,867 patent/US9321982B2/en active Active
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2015
- 2015-11-02 US US14/929,629 patent/US10626345B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
MY161993A (en) | 2017-05-31 |
EG26045A (en) | 2013-01-06 |
US10626345B2 (en) | 2020-04-21 |
PL2216576T3 (pl) | 2018-01-31 |
US9321982B2 (en) | 2016-04-26 |
EP2216576A1 (en) | 2010-08-11 |
EP2216576A4 (en) | 2016-03-09 |
AR069560A1 (es) | 2010-02-03 |
CA2706770C (en) | 2013-07-23 |
NO2216576T3 (zh) | 2018-02-17 |
US20100301600A1 (en) | 2010-12-02 |
MX2010006072A (es) | 2010-12-06 |
EA017703B1 (ru) | 2013-02-28 |
CA2706770A1 (en) | 2009-06-11 |
BRPI0820002B1 (pt) | 2019-01-22 |
AU2008332419A1 (en) | 2009-06-11 |
JP5124887B2 (ja) | 2013-01-23 |
EP2216576B1 (en) | 2017-09-20 |
JPWO2009072486A1 (ja) | 2011-04-21 |
US20160230119A1 (en) | 2016-08-11 |
CN101939579A (zh) | 2011-01-05 |
BRPI0820002A2 (pt) | 2015-05-19 |
WO2009072486A1 (ja) | 2009-06-11 |
EA201070682A1 (ru) | 2010-12-30 |
AU2008332419B2 (en) | 2012-08-09 |
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