###
工程科学与技术:2021,53(4):217-225
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
基于单向解耦法的等壁厚螺杆泵橡胶衬套热滞后研究
(西南石油大学 机电工程学院,四川 成都 610500)
Research on Thermal Hysteresis Behavior of Single-head PCP with Equal Thickness of Hydrogenated Nitrile in Heavy Oil Recovery
(College of Electro Mechanic Eng., Southwest Petroleum Univ., Chengdu 610500, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 777次   下载 275
投稿时间:2020-09-15    修订日期:2020-10-28
中文摘要: 稠油开采中使用最广的普通丁腈橡胶的螺杆泵容易发生定子衬套的烧心穿孔失效,昂贵的氢化丁腈橡胶耐高温却没有确切的使用深度和截面参数选择依据。为解决以上问题,首先基于普通丁腈橡胶和氢化丁腈橡胶热老化和拉伸试验拟合了橡胶超弹性本构模型,然后使用单向解耦法分解滞后生热过程建立了一种新型有限元模型,最后使用研究了工作井深、过盈量和壁厚对两种橡胶材料等壁厚单头螺杆泵的滞后生热影响规律,并列出3种因素的正交表。研究结果表明:普通丁腈橡胶在70 ℃及以下工作温度(对应工作深度1 667 m)中性能优于氢化丁腈,使用该螺杆泵具有较高的性价比,然而它在高温环境会发生严重老化,是目前应用中发生烧心穿孔失效的主要原因;氢化丁腈橡胶在150 ℃的工作温度(对应工作深度4 333 m)才开始出现老化,比普通丁腈力学性能稳定,所以可靠性占优;由于液柱压力和橡胶老化作用,两种橡胶的定子衬套与转子之间的最大应力均随工作深度增加呈现先降低后增加的规律;随着过盈量的增加,螺杆泵密封性能提高,截面的最高温度呈开口向上的上升二次函数;橡胶衬套壁厚每增加2 mm,内壁真实位移平均增加0.059~0.067 mm,对应增长率19%~28%,随着壁厚的增加,截面的最高温度呈开口向上的下降二次函数。综上所述,1 667 m是两种橡胶螺杆泵的使用分界线,过盈量取不漏失条件下最小值0.5 mm,壁厚取不漏失条件下最大值12 mm。研究结果为合理匹配定子橡胶衬套参数、优选定子橡胶材料以及提升螺杆泵全寿命周期工作性能提供理论支撑。
Abstract:Progressive cavity pumps (PCP), which uses the ordinary nitrile rubber, are widely used in heavy oil production, and it is prone to failure of the core-burning perforation of the stator bushing. The expensive hydrogenated nitrile rubber is resistant to high temperatures but does not have precise use depth and cross-sectional parameters. In order to solve above problems, first of all, the rubber hyperplastic constitutive model of ordinary nitrile rubber and hydrogenated nitrile rubber is fitted based on the thermal aging and tensile tests. And then, a new finite element model is established based on the one-way decoupling method to decompose the delayed heat generation phenomenon. Finally, the influences of working well depth, interference, and wall thickness on the lagging heat generation are studied, and the orthogonal table of the three factors is listed. The research results show that ordinary nitrile rubber is better than hydrogenated nitrile in working temperature below 70 ℃ (corresponding to the working depth of 1 667 m), but it will suffer serious aging in the deep working temperature or the high temperature environment, which is the main reason for core burn and perforation failure in current applications. Hydrogenated nitrile rubber begins to age at a working temperature of 150 ℃ (corresponding to the working depth of 4 333 m), which is more stable than ordinary nitrile in mechanical properties, so it is reliable. Due to liquid column pressure and rubber aging, the maximum stress between the bushing and the rotor is decreases first and then increases with the increase of working depth. With the increase of the interference, the sealing performance of the PCP improves, and the maximum temperature of the sleeve section increases exponentially. For every 2 mm increase in the thickness of the rubber bushing, the true displacement of the inner wall increases by 0.059~0.067 mm on average, corresponding to the growth rate of 19%~28%. It is concluded that the working depth of 1 667 m is the boundary between the two types of rubber PCP. The interference is the minimum value of 0.5 mm, and the maximum wall thickness is 12 mm under the condition of no leakage. The research results provide theoretical support for reasonably matching the parameters of the stator rubber bushing, which optimizing the stator rubber material, and improving the working performance of the PCP throughout the life cycle.
文章编号:202000801     中图分类号:TH161    文献标志码:
基金项目:成都市国际合作项目(2019-GH02-00034-HZ);四川省科技计划应用基础研究项目(2019YJ0347);西南石油大学钻井工具青年科技创新团队项目(2018CXTD03)
作者简介:第一作者:石昌帅(1984-),男,副教授,博士.研究方向:井下工具设计与力学.E-mail:scs1202@126.com
引用文本:
石昌帅,陈凯林,祝效华.基于单向解耦法的等壁厚螺杆泵橡胶衬套热滞后研究[J].工程科学与技术,2021,53(4):217-225.
SHI Changshua,CHEN Kailin,ZHU Xiaohua.Research on Thermal Hysteresis Behavior of Single-head PCP with Equal Thickness of Hydrogenated Nitrile in Heavy Oil Recovery[J].Advanced Engineering Sciences,2021,53(4):217-225.