西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (1): 111-118.DOI: 10.11885/j.issn.1674-5086.2018.01.11.03

• 石油与天然气工程 • 上一篇    下一篇

水平井偏心环空低速顶替运移机制研究

孙劲飞1, 李早元1, 罗平亚1, 张刚刚1, 焦少卿1,2   

  1. 1. "油气藏地质及开发工程"国家重点实验室·西南石油大学, 四川 成都 610500;
    2. 中国石化西南油气分公司, 四川 成都 610041
  • 收稿日期:2018-01-11 出版日期:2019-02-10 发布日期:2019-02-10
  • 通讯作者: 罗平亚,E-mail:luopy@swpu.edu.cn
  • 作者简介:孙劲飞,1992年生,男,汉族,江苏泰州人,博士研究生,主要从事油气井固井与完井等方面的研究工作。E-mail:747496316@qq.com;李早元,1976年生,男,汉族,四川简阳人,教授,博士生导师,主要从事固井完井工程的教学和科研工作。E-mail:2618919@qq.com;罗平亚,1940年生,男,汉族,四川隆昌人,中国工程院院士,主要从事钻井液与完井液、储层保护技术和提高采收率研究。E-mail:luopy@swpu.edu.cn;张刚刚,1993年生,男,汉族,陕西咸阳人,硕士,主要从事油气井固井与完井相关研究。E-mail:1434332917@qq.com;焦少卿,1982年生,男,汉族,甘肃定西人,博士,从事油气井固井水泥浆体系设计、固井工作液、固井材料研究以及钻井监督工作。E-mail:jsq0207@163.com
  • 基金资助:
    国家科技重大专项(2016ZX05062);四川省科技计划项目(2015SZ0003-004)

Study of the Transport Mechanism of Low-speed Displacement in Eccentric Annulus of Horizontal Wells

SUN Jinfei1, LI Zaoyuan1, LUO Pingya1, ZHANG Ganggang1, JIAO Shaoqing1,2   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Sinopec Southwest Oil & Gas Company, Chengdu, Sichuan 610041, China
  • Received:2018-01-11 Online:2019-02-10 Published:2019-02-10

摘要: 水平井固井顶替过程中,受限于现场设备,难以实现紊流顶替,而在层流流速区间内,两相流体在偏心环空中运移机制复杂。基于计算流体动力学方法,建立几何模型和数值模型,采用流体体积法对两相流体顶替界面进行追踪,研究了不同顶替流速下水平井偏心环空流体运移机制。结果表明,(1)低偏心度下,1倍隔离液用量能够实现90%顶替效率,而当偏心度大于0.5时,顶替效率相对较低,即使增加隔离液用量,也未能提高顶替效率;(2)针对套管严重偏心情况,将流速由1.0 m/s降低到0.2 m/s,有助于界面平稳发展,并多置换出6.8%钻井液,解决窄边滞留,宽边指进问题;(3)水平井偏心环空固井注替过程存在偏心效应、重力效应、黏滞效应等多方面影响,这些因素相互制约、相互作用,因此,针对现场实际井况,合理设计固井工艺参数,不仅能提高固井质量,还能起到降本增效的作用。

关键词: 水平井, 偏心度, 顶替流速, 顶替效率, 流动界面

Abstract: When displacing the cementing of horizontal wells, it is usually difficult to realize the replacement in turbulent flow because of instrumental limitation. In laminar flow, however, the transport mechanism of two-phase flow in the eccentric annulus can be quite complex. Based on the computational fluid dynamics method, we developed a geometric and numerical model, tracked the displacement interface of two-phase flow using the fluid volume method, and analyzed the transport mechanism of displacing fluids in the eccentric annulus of horizontal wells under various displacing flow rates. The following conclusions are drawn from the results:(1) With a low eccentricity, one-time use of isolation fluid can realize 90% displacing efficiency. When the eccentricity is greater than 0.5, the displacing efficiency becomes relatively small. In this case, increasing the amount of isolation fluids cannot further increase the displacing efficiency; (2) Considering the severe eccentricity of the casing, reducing the flow rate from 1.0 m/s to 0.2 m/s can help stabilize the interface and results in 6.8%higher displacement of drilling oil. Furthermore, this approach can also resolve the retention issue on the narrow side and pointing issue on the wide side; (3) The cementing displacement process in the eccentric annulus of horizontal wells is affected by multiple factors, including the eccentric effect, gravity effect, and viscous effect. These factors interact and inhibit with each other. Therefore, a reasonable design of cementing process parameters based on the actual well conditions on site can not only improve cementing quality, but also reduce cost and increase efficiency.

Key words: horizontal well, eccentricity, displacement flow rate, displacing efficiency, flow interface

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