重力效应对煤层气水平井固井顶替的影响研究

doi:10.3969/J. ISSN.1006-768X.2020.04.07

钻采工艺 ›› 2020, Vol. 43 ›› Issue (4): 24-27.DOI: 10.3969/J. ISSN.1006-768X.2020.04.07

重力效应对煤层气水平井固井顶替的影响研究

陈东^{1 ,2}, 包莉军³, 张毅^{1 ,2}, 张慧², 刘富⁴, 魏凯⁴

1 中联煤层气国家工程研究中心有限责任公司 2 中石油煤层气有限责任公司 3 中石油川庆钻探工程有限公司安全环保质量监督检测研究院 4 长江大学石油工程学院

出版日期:2020-07-25 发布日期:2020-07-25
作者简介:陈东( 1973 - ) , 高级工程师, 博士,2001 年毕业于中科院地质与地球物理所固体地球物理学专业, 现从事煤层气勘探开发工作。地址: ( 100095) 北京市海淀区地锦路中关村环保科技示范园 7 号院 1 号楼, 电话:010 - 50866630, E - mail: chend_cbm@ petrochina. com. cn
基金资助:
“ 十三五” 国家科技重大专项“ 大型油气田及煤层气开发” 子课题( 编号:2016ZX05043 - 002) 。

Study on the Influence of Gravity Effect on Cementing Displacement of Coalbed Methane Horizontal Wells

CHEN Dong^{1 ,2}, BAO Lijun³, ZHANG Yi^{1 ,2}, ZHANG Hui², LIU Fu⁴, WEI Kai⁴

1 . China United Coalbed Methane National Engineering Research Center Corp. , Ltd. , Beijing 100095, China; 2. Petrochina Coalbed Methane Company Ltd. , Beijing 100095, China; 3. CCDC Safety and Environmental Quality Supervision and Testing Institute, Guanghan, Sichuan 618300, China; 4. College of Petroleum Engineering, Yangteze University, Wuhan, Hubei 430100, China

Online:2020-07-25 Published:2020-07-25
Supported by:

摘要/Abstract

摘要： 水平井技术是高效开发煤层气资源的重要方式，受水平段套管自重和下套管工艺的影响，水平段环空偏心问题严重，固井质量难以保证，严重影响了煤层气水平井后期的压裂、排水采气等工序。针对水平井偏心环空注水泥顶替时的偏心特点和重力效应，基于LevelSet 理论建立了水平井固井注水泥顶替界面控制模型，采用数值方法对模型进行了求解，分析了重力效应对顶替界面形态变化的影响，为水平井固井注水泥设计提供了理论支撑。研究结果表明，水平井偏心环空注水泥时存在着严重的上部指进、下部滞流现象，随着顶替时间的增加，指进高度增大；重力效应能够降低偏心效应引起的指进现象，水泥浆与前置液的相对密度越大，偏心效应引起的指进现象越不明显；但对于煤层气储层来说，水泥浆密度过大容易导致煤层伤害，仅仅依靠提高水泥浆密度无法实现稳定顶替，还需要通过水泥浆流变性的调整实现。

关键词: , 油气井工程；煤层气；水平井固井；两相顶替；重力效应

Abstract:

Horizontal well technology is an important way to develop coalbed methane resources efficiently. Influenced by the dead weight of casing in the horizontal section and the casing running process, the eccentricity of the annulus in the horizontal section is serious, and the cementing quality is difficult to guarantee, which has seriously affected the fracturing, drainage and gas recovery processes in the late stage of the horizontal well of coalbed methane horizontal wells. This paper analyses characteristics of eccentric annulus replace cement injection and gravity effect of horizontal well was built based on Level Set theory cementing cement displacement interface control model, and the numerical method was used to solve the model, the gravity effect on displacement are analyzed how to influence the interface morphology change, providing theoretical supporting for horizontal well cementing design. The research results show that there are serious phenomena of upper fingering and lower retention during eccentric annulus cementing in horizontal wells. With the increase of displacement time, the fingering height increases. Gravity effect can reduce the fingering phenomenon caused by eccentricity effect. The higher the relative density of cement slurry and pre-fluids, the less obvious the fingering phenomenon caused by eccentricity effect. However, for CBM reservoirs, excessive density of cement slurry can easily lead to coal seam pollution, and stable displacement cannot be achieved only by increasing the density of cement slurry, which also needs to be realized by adjusting the rheological properties of cement slurry.

Key words: oil-gas well engineering, coalbed methane, horizontal well cementing, two phase displacement, gravity effect

中图分类号:

陈东, 包莉军, 张毅, 张慧, 刘富, 魏凯. 重力效应对煤层气水平井固井顶替的影响研究[J]. 钻采工艺, 2020, 43(4): 24-27.

CHEN Dong, BAO Lijun, ZHANG Yi, ZHANG Hui, LIU Fu, WEI Kai. Study on the Influence of Gravity Effect on Cementing Displacement of Coalbed Methane Horizontal Wells[J]. Drilling & Production Technology, 2020, 43(4): 24-27.

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重力效应对煤层气水平井固井顶替的影响研究

Study on the Influence of Gravity Effect on Cementing Displacement of Coalbed Methane Horizontal Wells

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