CN105886993A - 耐磨防腐抽油杆连接器、油管连接器 - Google Patents
耐磨防腐抽油杆连接器、油管连接器 Download PDFInfo
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Abstract
本发明耐磨防腐抽油杆连接器、油管连接器涉及油田抽油工具。其目的是为了提供一种在交变载荷下涂层和基体的应变差异较小的耐磨防腐抽油杆连接器和油管连接器,从而有效避免了涂层出现裂纹或从基体脱落。本发明一种耐磨防腐抽油杆连接器,于所述抽油杆连接器的基体表面覆有涂层,所述涂层成分按质量百分比计为:C:0.03‑0.05,Cr:3.6‑8,Mn:1.0‑3.5,Ni:0.5‑4.3,Mo:2.5‑6.7,Cu:0.5‑2.0,W:1.5‑8.6,V:3.5‑7.3,Nb:0.05‑0.07,Ti:0.1‑0.2,余量为Fe。
Description
技术领域
本发明涉及油田抽油工具,尤其涉及连接器。
背景技术
抽油机井一直以来都是国内外油田的主要采油方式,随着当前深井、超深井、稠油井、腐蚀井和高含水井越来越多,油井内的工作条件日益苛刻,原油中含有的腐蚀性介质越来越多,对油管管柱和抽油杆柱的腐蚀破坏越来越严重。作为连接油管的油管接箍和连接抽油杆的抽油杆接箍经常因腐蚀导致螺纹受损而失效,严重时导致油管管串和抽油杆串断脱而停井停产。
同时,由于抽油杆接箍外径比抽油杆大,在随抽油杆柱上下往复运动时经常接触到油管内壁而发生摩擦磨损。抽油杆接箍受损后,会进一步加速抽油杆接箍的腐蚀,磨损和腐蚀协同作用,导致抽油杆接箍失效,造成停井事故。
在这种情况下,如何提高井下抽油杆接箍和油管接箍的耐磨损抗腐蚀能力是当务之急。
目前,包括电镀、化学镀、表面热喷涂等技术在内的表面工程技术应用到抽油杆接箍和油管接箍的表面加工中。这些技术,通过在工件表面加工上一层具有防腐耐磨效果的保护层,一定程度上提高工件的耐磨防腐效果。如铁岭中油机械设备制造有限公司的专利《钨合金防腐抽油杆接箍》(专利号:200720184940.6)等文献,都是采用在抽油杆接箍表面进行渗镀处理,形成镀层,起到一定的防腐耐磨的效果。但是不论是电镀、化学镀还是渗镀,这些表面加工技术形成的镀层和基体的结合力始终不高,在长时间作用下,容易出现镀层片状脱落的现象。另外,如安东石油技术(集团)有限公司的专利《双向保护抽油杆接箍》(专利号:200510083018.3)和铁岭米勒石油新材料公司的专利《一种抽油杆喷焊接箍》(专利号:20091020975.1)等文献,都是采用在抽油杆接箍表面热喷涂一层合金粉末,形成防腐耐磨合金涂层的手段解决问题。通过热喷涂技术形成的涂层和基体的结合强度要好于镀层。但是由于这些热喷涂合金涂层都是以镍基合金粉末为主要成分,其材料配比与基体钢材差异较大,这就存在着在工件在井下处于交变载荷条件下,涂层和基体的应变差异较大,在长时间使用后,容易出现涂层就会出现裂纹或者和基体脱落的现象,导致耐磨防腐效果失效。
发明内容
本发明要解决的技术问题是提供一种涂层与基体结合力强,能够有效避免涂层出现裂纹或从基体脱落情况发生的耐磨防腐抽油杆连接器、油管连接器。
本发明一种耐磨防腐抽油杆连接器,于所述抽油杆连接器的基体表面覆有涂层,所述涂层成分按质量百分比计为:C:0.03-0.05,Cr:3.6-8,Mn:1.0-3.5,Ni:0.5-4.3,Mo:2.5-6.7,Cu:0.5-2.0,W:1.5-8.6,V:3.5-7.3,Nb:0.05-0.07,Ti:0.1-0.2,余量为Fe。
本发明一种耐磨防腐抽油杆连接器,其中所述涂层厚度为0.15-0.6mm。
本发明一种耐磨防腐抽油杆连接器,其中所述涂层成分按质量百分比计为:C:0.04,Cr:6.5,Mn:2.5,Ni:2.7,Mo:6.7,Cu:2.0,W:8.6,V:7.3,Nb:0.05,Ti:0.1,余量为Fe。
本发明一种耐磨防腐抽油杆连接器,其中所述涂层是通过热喷涂技术覆于抽油杆连接器基体表面的。
本发明一种油管连接器,于油管连接器的基体表面覆有涂层,所述涂层成分按质量百分比计为:C:0.03-0.05,Cr:3.6-8,Mn:1.0-3.5,Ni:0.5-4.3,Mo:2.5-6.7,Cu:0.5-2.0,W:1.5-8.6,V:3.5-7.3,Nb:0.05-0.07,Ti:0.1-0.2,余量为Fe。
本发明一种油管连接器,其中所述涂层厚度为0.15-0.6mm。
本发明一种油管连接器,其中所述涂层成分按质量百分比计为:C:0.03,Cr:3.6,Mn:1.0,Ni:0.5,Mo:4.5,Cu:1.0,W:4.7,V:5.6,Nb:0.07,Ti:0.2,余量为Fe。
本发明一种油管连接器,其中所述涂层是通过热喷涂技术覆于抽油杆连接器基体表面的。
通过实验验证得知,本发明一种耐磨防腐抽油杆连接器、油管连接器在涂层与基体的结合力上得到大幅提升,从而有效避免了涂层出现裂纹或从基体脱落。同时本发明一种耐磨防腐抽油杆连接器、油管连接器在耐高矿化度井液腐蚀性能上,在耐硫化氢腐蚀性能上,以及在耐磨性上相较于现有技术均有大幅提升,有效延长了抽油杆连接器、油管连接器的使用寿命。
具体实施方式
本发明一种耐磨防腐抽油杆连接器,于所述抽油杆连接器基体的表面通过热喷涂技术覆有厚度为0.15-0.6mm的涂层,所述涂层成分按质量百分比计为:C:0.03-0.05,Cr:3.6-8,Mn:1.0-3.5,Ni:0.5-4.3,Mo:2.5-6.7,Cu:0.5-2.0,W:1.5-8.6,V:3.5-7.3,Nb:0.05-0.07,Ti:0.1-0.2,余量为Fe。
本发明一种油管连接器,于油管连接器的基体表面通过热喷涂技术覆有厚度为0.15-0.6mm的涂层,所述涂层成分按质量百分比计为:C:0.03-0.05,Cr:3.6-8,Mn:1.0-3.5,Ni:0.5-4.3,Mo:2.5-6.7,Cu:0.5-2.0,W:1.5-8.6,V:3.5-7.3,Nb:0.05-0.07,Ti:0.1-0.2,余量为Fe。
本发明钢材中的C基本控制在0.03-0.05%,在一般冷却速度下只有少量Cr23C6的碳化物生成,在晶界不会出现连续的碳化物,从而具有较强的抗晶界腐蚀能力。
Cr元素能提高C在钢中的固溶度,Cr含量高能提高抗晶界腐蚀能力。
Cr、Mo、Si、Ni都是抗点蚀的有利元素。但是Ni元素含量过高,会降低C在钢中的固溶度,从而降低抗晶界腐蚀能力。
Ti或Nb是强碳化物形成元素,在钢中主要功能都是细化晶粒和形成钛或铌的碳化物和氮化物,减少或避免有害的Cr23C6型碳化物析出,从而提高钢的强度和耐蚀性。
V起到细化晶粒的作用,降低过热敏感性,增加回火稳定性和耐磨性,从而延长了工具的使用寿命。
性能验证
为了验证本发明耐磨防腐抽油杆连接器和油管连接器的具体效果,首先制取了三种涂层粉末,其中各涂层粉末的配比见下表。
然后通过热喷涂技术将三种粉末分别覆于抽油杆连接器基体表面和油管连接器基体表面,从而制取了本发明耐磨防腐抽油杆连接器和油管连接器。
接下来对制取的抽油杆连接器和油管连接器进行性能验证,需要说明的是,对连接器的验证实质上是验证涂层对基体性能的影响程度,而本发明中的抽油杆连接器和油管连接器的基体和涂层材质一致,因此如下验证仅选取抽油杆连接器进行了验证,但实验结果同样能够反映油管连接器的性能。具体试验方法及实验结果分别为:
耐高矿化度井液腐蚀试验
在实验室中,利用5L高温高压FCZ磁力驱动哈氏合金C-276反应釜进行高矿化度井液耐腐蚀性试验,实验温度90℃,实验时间240小时;其中,井液采自胜利油田某高矿化度油井,具体成分如下表:
为了与现有技术形成对照,该实验过程还选用20CrMo钢做了对比试验。测量实验前后各试样重量变化情况如下表所示:
由上表可以看出,在油田高矿化度腐蚀井液中,本发明比常规钢材腐蚀失重减小了约80%,由此可以推导出本发明具有较强的耐高矿化度井液腐蚀性能。
耐硫化氢腐蚀性能检测实验
在实验室中,利用5L高温高压FCZ磁力驱动哈氏合金C-276反应釜进行硫化氢介质耐腐蚀性试验,实验温度130℃,H2S分压3Mpa,CO2分压2Mpa,15%HCl溶液,浸没时间240小时。为了与现有技术形成对照,该实验过程还选用20CrMo钢做了对比试验。实验过后,去除表面腐蚀产物后进行称重结果如下表所示:
由上表可以看出,在硫化氢腐蚀条件下,本发明比常规钢材腐蚀失重减小了约65%,由此可以推导出本发明具有较强的耐硫化氢腐蚀性能。
涂层结合力检测实验
采用GB-TS2000电脑伺服控制涂层材料专用万能材料试验机进行Ni60镍基合金涂层和本发明涂层结合强度的对比检测实验。
将制得的带有涂层的试样(基体统一为45号钢)用专用夹具固定在试验机中,设定检测实验的位移速度1mm/min,加载速度0.807N/min,进行均匀持续加载,至试样破坏,记录下破坏时的施加载荷。得到实验数据如下表所示:
由上表可知,本发明的涂层与常规镍基合金粉末涂层相比,结合强度提高了约30%。
摩擦磨损实验
磨损试验在MM-200型摩擦磨损试验机上进行,块试样采用N80油管钢,环试样为45钢基体表面喷焊0.25~1.00mm厚的涂层,实验结果如下表所示:
由上表可知,本发明比常规材料的耐磨性提高了约3倍。
综上所述,本发明耐磨防腐抽油杆连接器、油管连接器无论是在耐高矿化度井液腐蚀性能上,还是在耐硫化氢腐蚀性能上,还是在涂层结合力上,以及在耐磨性上相较于现有技术均有大幅提升。
以上所述的实施例仅仅是对本发明的优选实施方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案作出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (8)
1.一种耐磨防腐抽油杆连接器,于抽油杆连接器的基体表面覆有涂层,其特征在于:所述涂层成分按质量百分比计为:C:0.03-0.05,Cr:3.6-8,Mn:1.0-3.5,Ni:0.5-4.3,Mo:2.5-6.7,Cu:0.5-2.0,W:1.5-8.6,V:3.5-7.3,Nb:0.05-0.07,Ti:0.1-0.2,余量为Fe。
2.根据权利要求1所述的一种耐磨防腐抽油杆连接器,其特征在于:所述涂层厚度为0.15-0.6mm。
3.根据权利要求1所述的一种耐磨防腐抽油杆连接器,其特征在于:所述涂层成分按质量百分比计为:C:0.04,Cr:6.5,Mn:2.5,Ni:2.7,Mo:6.7,Cu:2.0,W:8.6,V:7.3,Nb:0.05,Ti:0.1,余量为Fe。
4.根据权利要求1所述的一种耐磨防腐抽油杆连接器,其特征在于:所述涂层是通过热喷涂技术覆于抽油杆连接器基体表面的。
5.一种油管连接器,于油管连接器的基体表面覆有涂层,其特征在于:所述涂层成分按质量百分比计为:C:0.03-0.05,Cr:3.6-8,Mn:1.0-3.5,Ni:0.5-4.3,Mo:2.5-6.7,Cu:0.5-2.0,W:1.5-8.6,V:3.5-7.3,Nb:0.05-0.07,Ti:0.1-0.2,余量为Fe。
6.根据权利要求5所述的一种油管连接器,其特征在于:所述涂层厚度为0.15-0.6mm。
7.根据权利要求5所述的一种油管连接器,其特征在于:所述涂层成分按质量百分比计为:C:0.03,Cr:3.6,Mn:1.0,Ni:0.5,Mo:4.5,Cu:1.0,W:4.7,V:5.6,Nb:0.07,Ti:0.2,余量为Fe。
8.根据权利要求5所述的一种油管连接器,其特征在于:所述涂层是通过热喷涂技术覆于抽油杆连接器基体表面的。
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