CN107699838A - 一种分段压裂用可降解涂层球座及其制备方法 - Google Patents
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Abstract
本发明公开了一种分段压裂用可降解涂层球座,包括构成球座主体的可降解球座基体,位于可降解球座基体内部的可降解球座内孔面、可降解球座锥面、可降解球座底部圆孔,在可降解球座锥面上包覆有耐降解涂层。耐降解涂层采用不可降解的金属材料制作。本发明的可降解球座中的耐降解涂层与球座锥面结合强度高,不易剥落;具有上述耐降解涂层的可降解压裂球座不但可使可降解球及球座接触密封部位不发生降解,在井下保持较长时间,而且光滑涂层锥面又可使可降解球及球座接触密封,具备压裂施工承压的技术要求。
Description
技术领域
本发明涉及一种分段压裂用可降解涂层球座及其制备方法,属于油气田开发技术领域。
背景技术
随着分段压裂技术的发展,应用于压裂工艺的井下工具由可钻、易钻向可降解的方向发展,已形成了由高强度可降解金属材料制作的可降解球、可降解球座等多种井下工具。可降解金属材料密度小,质量轻,具有良好的机械性能和耐高温性能,而且在盐水环境中可以自行降解,解决了常规井下工具难打捞、难钻铣的弊端,极大地缩减了作业工序,节约了施工周期,提高了生产效率。
由Mg-Al可降解金属合金加工而成的可降解球座,放置井下设计位置进行压裂施工。一方面球座在井下放置很长时间,会在盐水环境中自行发生降解产生电化学腐蚀现象,因而必须马上进行压裂施工;另一方面,不可降解球座虽然可以在井下放置很长时间不会腐蚀,但不会自行发生降解,还需连续油管钻磨作业。
中国专利(CN 104805438 A)介绍了可分解压裂球座表面耐蚀膜层及球座及球座制备方法。该专利提供了一种可分解压裂球座,包括球座基体和可分解压裂球座表面耐蚀膜层,但耐蚀膜层主要包覆于球座基体的表面,保证可分解球座在井筒内保存完好,不会提前腐蚀分解或因冲刷而失去承压功能,而对可降解球及球座接触密封的锥面部位并没有详细介绍或进行有效的防护处理。
发明内容
本发明所要解决的技术问题是,提供一种分段压裂用可降解涂层球座及其制备方法。
为了解决上述技术问题,本发明采用的技术方案是:一种分段压裂用可降解涂层球座,包括构成球座主体的可降解球座基体,位于可降解球座基体内部的可降解球座内孔面、可降解球座锥面、可降解球座底部圆孔,在可降解球座锥面上包覆有耐降解涂层。
所述耐降解涂层采用不可降解的金属材料制作,金属材料为纯铝丝材、锌铝合金丝材、锌丝中的一种。
所述耐降解涂层厚度为0.3-0.5mm。
所述可降解球座基体采用可降解金属材料制作,可降解金属材料为镁铝合金、铝镁合金、镁铜合金、镁锌合金、镁铝镍合金中的至少一种,该材料在100℃低矿化度水的环境下,5-10天内完全降解。
所述可降解球座基体的底部外沿设置有可降解球座底部倒角。
所述可降解球座基体直径Φ72mm,可降解球座内孔直径Φ32mm,可降解球座涂层锥面锥度为30℃,可降解球座底部圆孔内径Φ18mm,可降解球座底部倒角为45°,可降解球座基体长度80mm。
上述分段压裂用可降解涂层球座的制备方法,采用热喷涂工艺在可降解球座锥面部位制备耐降解涂层,包括以下步骤:
a、用棕刚玉砂对可降解球座锥面进行毛化处理;
b、采用热喷涂工艺在可降解球座锥面部位表面沉积耐降解涂层;
c、对上述耐降解表面进行精车加工,表面粗糙度Ra12.5μm,使得涂层厚度为0.3-0.5mm;
d、采用封孔剂对上耐降解涂层中的微孔进行填充封闭处理。
所述耐降解涂层采用不可降解的金属材料制作,金属材料为纯铝丝材、锌铝合金丝材、锌丝中的一种。
本发明的有益效果是:本发明分段压裂用可降解涂层球座不但可使可降解球及球座接触密封部位不发生降解,在井下保持较长时间,而且光滑涂层锥面又可使可降解球及球座接触密封,具备压裂施工承压的技术要求。
附图说明
图1是本发明分段压裂用可降解涂层球座结构示意图。
图2是本发明的分段压裂用可降解涂层球座承压性能试验装配结构示意图。
具体实施方式
以下通过具体实施例详细说明本发明的实施过程和产生的有益效果,旨在帮助阅读者更好地理解本发明的实质和特点,不作为对本案可实施范围的限定。
如图1所示,本发明的分段压裂用可降解涂层球座,包括构成球座主体的可降解球座基体1,位于可降解球座基体1内部的可降解球座内孔面2、可降解球座锥面3、可降解球座底部圆孔4,在可降解球座锥面3上包覆有耐降解涂层5。
所述耐降解涂层5采用不可降解的金属材料制作,金属材料为纯铝丝材、锌铝合金丝材、锌丝中的一种。
所述耐降解涂层5厚度为0.3-0.5mm。
所述可降解球座基体1采用可降解金属材料制作,可降解金属材料为镁铝合金、铝镁合金、镁铜合金、镁锌合金、镁铝镍合金中的至少一种,该材料在100℃低矿化度水的环境下,5-10天内完全降解。
所述可降解球座基体1的底部外沿设置有可降解球座底部倒角6。
优选,所述可降解球座基体1直径Φ72mm,可降解球座内孔2直径Φ32mm,可降解球座涂层锥面3锥度为30℃,可降解球座底部圆孔4内径Φ18mm,可降解球座底部倒角6为45°,可降解球座基体1长度80mm。
上述分段压裂用可降解涂层球座的制备方法,采用热喷涂工艺在可降解球座锥面部位制备耐降解涂层,包括以下步骤:
a、用50目的棕刚玉砂对可降解球座锥面进行毛化处理;
b、采用热喷涂工艺在可降解球座锥面部位表面沉积耐降解涂层;
c、对上述耐降解表面进行精车加工,表面粗糙度Ra12.5μm,使得涂层厚度为0.3-0.5mm;
d、采用封孔剂对上耐降解涂层中的微孔进行填充封闭处理。
所述耐降解涂层采用不可降解的金属材料制作,金属材料为纯铝丝材、锌铝合金丝材、锌丝中的一种。
可降解球座承压性能的关键在于可降解球及球座接触密封的锥面部位。因此,在可降解球及球座接触密封锥面预先涂好一层不可降解金属,涂层锥面不但使可降解球座密封部位不发生降解,在井下保持较长时间,而且光滑涂层锥面又可使可降解球及球座接触密封,具备压裂施工承压的技术要求。
实施例1
本实施例提供了一种分段压裂用可降解涂层球座的制备方法,采用热喷涂工艺在可降解球座锥面部位3制备耐降解涂层5,其主要包括以下步骤:
a、表面清洗:对上述可降解球座锥面部位3进行初步除油处理,使用清水清洗可降解球座内孔面2和可降解球座锥面部位3,之后将可降解球座内孔面2和可降解球座锥面部位3进行干燥处理。
b、前处理:用50目的棕刚玉砂对可降解球座锥面3进行表面喷砂。在除油除杂质的同时,增加表面粗糙度,提高后续热喷涂涂层的粘附力。
c、采用热喷涂工艺在可降解球座锥面部位3表面沉积铝合金涂层,喷涂的铝合金涂层厚度为0.8~1.2mm,粘接强度15MPa,喷涂的燃气气压0.4MPa,喷涂距离15-20mm,丝材进给速度1-1.5g/s。
d、对上述铝合金涂层表面进行精车加工,表面粗糙度Ra12.5μm,车刀进给量20um,使得铝合金涂层厚度为0.3-0.5mm;
e、采用高温封孔剂YM-681对上述铝合金涂层中的微孔进行填充封闭处理。
实施例2
本实施例提供了由实施例1制备得到的一种分段压裂用可降解涂层球座,如图2所示对实施例2进一步说明。该分段压裂用可降解涂层球座,所述可降解球9及球座基体1采用可降解金属材料制作,可降解金属材料为镁铝合金、铝镁合金、镁铜合金、镁锌合金、镁铝镍合金等材料中的至少一种,该材料在100℃低矿化度水的环境下,5-10天内可完全降解,
所述可降解球座基体1主要包括可降解球座内孔2、可降解球座涂层锥面3、可降解球座底部圆孔4、可降解球座底部倒角6。
将可降解球座涂层锥面3进行抛光,可降解球座基体1上部连接打压接头7,打压接头7上部连接打压嘴8,用柴油通过打压嘴8对涂层锥面3进行承压性能试验。投入可降解球9,加压50MPa,保压30min,观察压力变化情况,有无泄漏。加压50MPa,保压30min后,压力无明显下降,说明可降解球9及球座涂层锥面3密封系统具备50MPa承压性能。
实施例3
采用1%NaCl溶液,加热至95℃,对涂层锥面3进行密封降解性能试验。投入可降解球9,加压50MPa,进行3d降解试验,观察球座涂层锥面3有无明显腐蚀现象,确定球9降解后涂层锥面3的密封效果。加压50MPa,3d后球座涂层锥面3无明显腐蚀现象,球座涂层锥面3没有发生降解现象,说明可降解球9及球座涂层锥面3形成良好的密封系统。试验后发现可降解9球发生明显的电化学腐蚀现象,可降解球9与球座涂层锥面3具有明显压痕,发生一定塑性变形。
综上所述,本发明的内容并不局限在上述的实施例中,相同领域内的有识之士可以在本发明的技术指导思想之内可以轻易提出其他的实施例,但这种实施例都包括在本发明的范围之内。
Claims (8)
1.一种分段压裂用可降解涂层球座,包括构成球座主体的可降解球座基体(1),位于可降解球座基体(1)内部的可降解球座内孔面(2)、可降解球座锥面(3)、可降解球座底部圆孔(4),其特征在于,在可降解球座锥面(3)上包覆有耐降解涂层(5)。
2.根据权利要求1所述分段压裂用可降解涂层球座,其特征在于,所述耐降解涂层(5)采用不可降解的金属材料制作,金属材料为纯铝丝材、锌铝合金丝材、锌丝中的一种。
3.根据权利要求1所述分段压裂用可降解涂层球座,其特征在于,所述耐降解涂层(5)厚度为0.3-0.5mm。
4.根据权利要求1所述分段压裂用可降解涂层球座,其特征在于,所述可降解球座基体(1)采用可降解金属材料制作,可降解金属材料为镁铝合金、铝镁合金、镁铜合金、镁锌合金、镁铝镍合金中的至少一种,该材料在100℃低矿化度水的环境下,5-10天内完全降解。
5.根据权利要求1所述分段压裂用可降解涂层球座,其特征在于,所述可降解球座基体(1)的底部外沿设置有可降解球座底部倒角(6)。
6.根据权利要求1-5任一项所述分段压裂用可降解涂层球座,其特征在于,所述可降解球座基体(1)直径Φ72mm,可降解球座内孔(2)直径Φ32mm,可降解球座涂层锥面(3)锥度为30℃,可降解球座底部圆孔(4)内径Φ18mm,可降解球座底部倒角(6)为45°,可降解球座基体(1)长度80mm。
7.一种如权利要求1所述分段压裂用可降解涂层球座的制备方法,其特征在于,采用热喷涂工艺在可降解球座锥面部位制备耐降解涂层,包括以下步骤:
a、用棕刚玉砂对可降解球座锥面进行毛化处理;
b、采用热喷涂工艺在可降解球座锥面部位表面沉积耐降解涂层;
c、对上述耐降解表面进行精车加工,表面粗糙度Ra12.5μm,使得涂层厚度为0.3-0.5mm;
d、采用封孔剂对上耐降解涂层中的微孔进行填充封闭处理。
8.根据权利要求7所述分段压裂用可降解涂层球座的制备方法,其特征在于,所述耐降解涂层采用不可降解的金属材料制作,金属材料为纯铝丝材、锌铝合金丝材、锌丝中的一种。
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CN204492756U (zh) * | 2015-02-12 | 2015-07-22 | 中国石油集团渤海钻探工程有限公司 | 用于投球滑套的可溶球座和压裂球 |
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