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CO2注入井封隔器早期密封失效机制研究
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国家自然科学基金项目(51774094);中国石油科技创新基金项目(2017D-5007-0310);黑龙江省博士后特别资助项目(博士后青年英才计划LBH-TZ12);“十三五”国家科技重大专项(2016ZX05016002).


Research on Early Seal Failure Mechanism of Packer in CO2 Injection Well
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    摘要:

    为了揭示CO2注入井中性能优良的氢化丁腈橡胶封隔器早期密封失效的机制,根据失效井的特征分析以及CO2的相态特点,提出实现恒定泄压速度的室内实验方法,并对不同CO2泄压速度下橡胶表面进行形貌观测和力学性能测试分析。结果表明:随着泄压速度的增加,橡胶表面出现了小气泡、大气泡甚至气泡破裂等龟裂现象,橡胶的密封性能均明显变差;注气井突然泄压时,橡胶内部的气体在短时间内无法渗出,其在内外压差作用下会膨胀形成气泡甚至爆裂,这是造成CO2注入井封隔器早期密封失效的主要原因。为了防止封隔器的早期密封失效,推荐现场井口泄压速度控制在5 MPa/h以内。

    Abstract:

    In order to reveal the mechanism of early seal failure of the high performance HNBR packer in CO2 injection well,the features of failure wells and the phase characteristics of CO2 were analyzed,and an indoor experimental method for achieving a constant decompression rate was proposed.The rubber surface topography was observed and the mechanical performance was tested under different CO2 decompression rates.The results show that with the increase of the decompression rate,the phenomenon of small bubbles,large bubbles and bubble rupture appear on the rubber surface,and the sealing performance of the rubber is obviously deteriorated.When thepressure the gas injection well is suddenly relieved,the gas inside the rubber can not seep out in a short time.Under the action of internal and external pressure difference,it will expand to form bubbles or even burst,which is the main reason for the early seal failure of packer in CO2 injection well.In order to prevent the the early seal failure of packer,it is recommended that the decompression rate of wellhead onsite should be controlled within 5 MPa/h.

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张德平,冯福平,李清,严茂森,艾池,丛子渊. CO2注入井封隔器早期密封失效机制研究[J].润滑与密封,2019,44(5):109-115.
. Research on Early Seal Failure Mechanism of Packer in CO2 Injection Well[J]. Lubrication Engineering,2019,44(5):109-115.

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  • 在线发布日期: 2019-07-04
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