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累积工况下CO2对稠油热采水泥石的修复作用

成涛 刘鹏超 欧志鹏 熊鑫

成涛,刘鹏超,欧志鹏,等. 累积工况下CO2对稠油热采水泥石的修复作用[J]. 钻井液与完井液,2021,38(5):628-633 doi: 10.3969/j.issn.1001-5620.2021.05.014
引用本文: 成涛,刘鹏超,欧志鹏,等. 累积工况下CO2对稠油热采水泥石的修复作用[J]. 钻井液与完井液,2021,38(5):628-633 doi: 10.3969/j.issn.1001-5620.2021.05.014
CHENG Tao, LIU Pengchao, OU Zhipeng, et al.Remediation of set cement in heavy oil thermal production wells with CO2 under cumulative working conditions[J]. Drilling Fluid & Completion Fluid,2021, 38(5):628-633 doi: 10.3969/j.issn.1001-5620.2021.05.014
Citation: CHENG Tao, LIU Pengchao, OU Zhipeng, et al.Remediation of set cement in heavy oil thermal production wells with CO2 under cumulative working conditions[J]. Drilling Fluid & Completion Fluid,2021, 38(5):628-633 doi: 10.3969/j.issn.1001-5620.2021.05.014

累积工况下CO2对稠油热采水泥石的修复作用

doi: 10.3969/j.issn.1001-5620.2021.05.014
基金项目: 国家自然科学基金青年基金项目“致密油储层岩石注水吞吐实验与多尺度动态网络模拟研究”(41902157);西南石油大学科研“启航计划”“致密油藏岩石逆向渗吸实验与多尺度动态网络模拟研究”(2018QHZ002);中国博士后科学基金面上项目“致密油储层岩石渗吸实验与动态网络模拟研究”(2018M633632XB)
详细信息
    作者简介:

    成涛,高级工程师,1969年生,毕业于西南石油学院油藏工程专业,主要从事油气田开发工作。E-mail:chengt@cnooc.com.cn

  • 中图分类号: TE256.6

Remediation of Set Cement in Heavy Oil Thermal Production Wells with CO2 under Cumulative Working Conditions

  • 摘要: 根据稠油火烧水泥石在井下先经历蒸汽吞吐、蒸汽驱,再经历稠油火烧的实际工况,利用超高温水泥石养护装置及高温高压腐蚀釜,研究累积工况下CO2对水泥石抗压强度及腐蚀深度的变化规律;同时,利用XRD和SEM等技术探明了CO2对水泥石化学结构及微观形貌的影响。实验结果表明,水泥石经常温及高温养护后呈现高孔渗、低强度的特征,但累积工况下经CO2腐蚀釜养护后,抗压强度不减反增,到28 d时已升至53.4 MPa,较蒸汽驱后提高了54.87%;而随着CO2腐蚀龄期的延长,水泥石腐蚀深度逐渐加深,结构更为致密,且28 d后已被完全碳化。究其原因,水泥石经CO2腐蚀后,腐蚀产物CaCO3溶解度较低,并在孔隙中沉淀结晶,堵塞毛细孔或将大孔分割成小孔,使水泥颗粒密实度提高。该研究结果可进一步丰富业界对CO2腐蚀的认识,同时也为稠油火烧水泥浆体系的性能评价、配方优化提供参考。

     

  • 图  1  超高温水湿模拟养护装置

    图  2  水泥石养护温度制度

    图  3  CO2与水泥石内部反应区域划分

    图  4  水泥石腐蚀前后酚酞滴定实验

    图  5  累积工况下水泥石抗压强度测试结果

    图  6  腐蚀前后水泥石X射线衍射图

    图  7  腐蚀前后水泥石微观结构

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出版历程
  • 收稿日期:  2021-04-02
  • 刊出日期:  2021-10-01

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