大斜度井电泵举升管柱扶正器间距的计算

doi:10.7623/syxb201306021

石油学报 ›› 2013, Vol. 34 ›› Issue (6): 1189-1194.DOI: 10.7623/syxb201306021

大斜度井电泵举升管柱扶正器间距的计算

孙浩, 刘清友

西南石油大学机电工程学院四川成都 610500

收稿日期:2013-06-01 修回日期:2013-08-30 出版日期:2013-11-25 发布日期:2013-10-13
通讯作者: 孙浩
作者简介:孙浩，男，1988年1月生，2011年获西南石油大学机电工程专业学士学位，现为西南石油大学机电工程专业硕士研究生，主要从事石油与天然气装备现代设计与仿真方面的研究工作。Email：578278837@qq.com
基金资助:
国家自然科学基金项目（No.50874096）和国家重大科技专项（2011ZX05050）资助。

Reasonable spacing calculation of centralizers of submersible pump lifting string in highly deviated wells

SUN Hao, LIU Qingyou

School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China

Received:2013-06-01 Revised:2013-08-30 Online:2013-11-25 Published:2013-10-13

摘要/Abstract

摘要：

电泵举升管柱加装扶正器可保持油管和套管之间的合理间隙，防止电泵电缆遭到挤压和磨损。扶正器的安装主要依靠经验判断，缺乏理论依据和计算方法，既增加了生产成本，又增大了井下事故的风险。在综合了井眼轨迹、油管柱内外液体密度、扶正器和套管内壁摩擦、管柱自重、油/套管几何参数等因素对管柱受力和变形影响的基础上，结合现场生产实际工况，运用微元法建立了大斜度井三维井眼电泵举升管柱力学模型，实现了不同工况条件下油管柱的受力与变形分析计算；结合两扶正器之间油管横向变形计算模型，建立了油管扶正器间距的计算模型，并开发了计算机辅助分析计算软件；通过实例验证了油管扶正器间距计算模型的可靠性。研究结果对于扶正器现场安装具有一定的理论指导意义。

关键词: 大斜度井, 扶正器, 合理间距, 模型建立, 软件开发

Abstract:

A centralizer installed on electric submersible pump can maintain a reasonable gap between the string and casing during lifting string and effectively prevent the pump from cable extrusion and abrasion. At present, the installation of centralizers in domestic oilfields depends usually on experiences, lacking theoretical bases and computational methods for how to scientifically determine a reasonable spacing of centralizers, however, which, is susceptible to the increase of production cost and the risk of downhole accidents. Based on comprehensively considering the influences of various factors on the forces and deformation of a string, including wellbore trajectory, liquid density inside and outside the flow string, friction between a centralizer and internal walls of the casing, the self-weight of a string and geometrical dimensions of the annulus, a micro-element method was used to establish a mechanical model for lifting string of three-dimensional borehole electric pump in highly deviated wells. With which the forces and deformation of a string under different operation conditions can be analyzed and calculated. According to the principle that electric pump cables cannot be squeezed, centralizer spacing calculation model was deduced from computational model for the maximum lateral deformation between centralizers. Moreover, computer-aided design software was developed based on the above-mentioned theoretical models. Calculation results proved that this new computational model is reliable and the software has a high computational accuracy, thus, the present study is of somewhat guiding importance to the in-situ installation of centralizers.

Key words: highly deviated well, centralizer, reasonable spacing, modeling, software development

中图分类号:

TE933

孙浩, 刘清友. 大斜度井电泵举升管柱扶正器间距的计算[J]. 石油学报, 2013, 34(6): 1189-1194.

SUN Hao, LIU Qingyou. Reasonable spacing calculation of centralizers of submersible pump lifting string in highly deviated wells[J]. ACTA PETROLEI SINICA, 2013, 34(6): 1189-1194.

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大斜度井电泵举升管柱扶正器间距的计算

Reasonable spacing calculation of centralizers of submersible pump lifting string in highly deviated wells

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