石油学报 ›› 2017, Vol. 38 ›› Issue (4): 461-467.DOI: 10.7623/syxb201704010

• 石油工程 • 上一篇    下一篇

宾汉塑性流体中旋流扶正器间距设计方法

舒秋贵1, 罗德明2   

  1. 1. 西华师范大学油气资源开发与油田环境保护研究所 四川南充 637002;
    2. 中国石油化工股份有限公司西南石油工程公司固井分公司 四川德阳 618000
  • 收稿日期:2016-06-15 修回日期:2017-02-10 出版日期:2017-04-25 发布日期:2017-05-04
  • 通讯作者: 舒秋贵,男,1972年7月生,1995年毕业于江西师范大学,2004年获西南石油大学院油气井工程专业博士学位,现为西华师范大学油气资源开发与油田环境保护研究所副研究员、硕士生导师,主要从事油气井固井理论与技术研究。Email:shuqiugui@163.com
  • 作者简介:舒秋贵,男,1972年7月生,1995年毕业于江西师范大学,2004年获西南石油大学院油气井工程专业博士学位,现为西华师范大学油气资源开发与油田环境保护研究所副研究员、硕士生导师,主要从事油气井固井理论与技术研究。Email:shuqiugui@163.com
  • 基金资助:

    四川省科技厅科技计划项目(No.2017JY0816)资助。

Design method for the space of spiral centralizers in Bingham plastic fluid

Shu Qiugui1, Luo Deming2   

  1. 1. Oil and Gas Resource Development and Environmental Protection Research Institute , China West Normal University, Sichuan Nanchong 637002, China;
    2. Cementing Company, Sinopec Southwest Oilfield Service Company, Sichuan Deyang 618000, China
  • Received:2016-06-15 Revised:2017-02-10 Online:2017-04-25 Published:2017-05-04

摘要:

油气井固井注水泥施工时使用旋流扶正器导流产生螺旋流的顶替方式,可以大大提高注水泥顶替效率;但是,目前油气井固井使用旋流扶正器大多凭借经验,缺乏理论依据和行业标准。对固井施工使用较多的宾汉塑性流体介质条件下旋流扶正器的井下间距设计方法进行了研究。使用聚丙烯酰胺配制相似液模拟直井条件下的环空流体进行实验,使用吊线法测取沿程旋流角,得出宾汉塑性流体在旋流扶正器导流作用后旋流衰减规律,通过受力平衡分析推导出了被顶替液静切力小于等于和大于1.81倍顶替液的动切力值时的旋流扶正器安装间距计算公式;该公式反映了井眼环空结构、旋流扶正器导流角、导叶高度,以及宾汉塑性流体性能对旋流扶正器井下间距的影响,为指导旋流扶正器井下间距设计、优化固井液的性能、合理使用施工排量提供了依据。

关键词: 宾汉塑性流体, 旋流扶正器, 固井, 顶替, 螺旋流

Abstract:

During cementing in oil gas well, the displacement efficiency of cementing can be significantly improved by helical flow generated from the diversion of spiral centralizer. However, the current application of spiral centralizer for oil gas well cementing is mostly based on experience rather than theoretical basis and industry standard. A study was conducted on the design method for the space of spiral centralizers in Bingham plastic fluid medium (commonly used during well cementing). The experiment was carried out using a similar fluid with polyacrylamide for simulating the annular fluid in vertical well. Then the swirl angle along the way was measured with plumbing method, thus understanding the helical flow attenuation regularity in Bingham plastic fluid after diversion by spiral centralizer. Moreover, based on force balance analysis, the calculation formula for the installation space of centralizer was deduced when the displaced fluid's gel strength is greater than, equal to or less than the dynamic shear force of displacement fluid (displaced fluid x 1.81);the deduced calculation formula reflects the influence of borehole annular space structure, diversion angle of centralizer, guide vane height and the performance of Bingham plastic fluid on the installation space of centralizers, which further provides a basis for the space design of spiral centralizers, performance optimization of cementing fluid and rational application of operation discharge.

Key words: Bingham plastic fluid, spiral centralizer, well cementing, displacement, helical flow

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