镁氧水泥用于油井堵漏及暂闭的室内研究  

LABORATORY STUDY ON MAGNESIA CEMENT FOR OIL WELL SEALING AND TEMPORARY BLOCKING

作　　者：李早元[1] 靳东旭[1] 周超[1] 葛红江 郭小阳[1] 

机构地区：[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]中国石油大港油田采油工艺研究院,天津大港300280

出　　处：《西南石油大学学报（自然科学版）》2011年第5期152-156,202,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：利用物相分析、电镜扫描等手段,研究了镁氧水泥在模拟井下工况水热环境中的热稳定性及酸溶蚀特性,分析和探讨了氯氧镁强度在水热环境中衰退的机理。研究结果表明:氯氧镁水泥在水热环境下5.1.8相易发生晶型转变,致使强度急剧衰减;而硫氧镁水泥克服了氯氧镁水泥在水热环境下稳定性不良的缺陷,内掺5%碳酸钙后,硫氧镁水泥石2 h酸溶能力达95%以上,且具有较高的抗压强度,为产层封堵或暂闭提供了一种新型的暂闭封堵技术。Magnesia cement applied to downhole has some advantages of decrease waiting on cement to set,completelyacid-soluble,easy flow to a narrow annular space and low thermal conductivity.This paper uses physicalphase analysis,scanning electron microscope and other means to study the magnesia cement's thermal stability andacid dissolution characteristics in the water bath simulation down hole conditions.We also analyze and discussthe mechanism of magnesium oxychloride cement strength decline in the hydrothermal environment.Experimentsshow that magnesium oxychloride cement in hydrothermal environments 5
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8-phase undergoes phase transitionwhich results in the rapid attenuation of intensity.However,sulfur oxygen magnesium cement overcomes the poorstability of magnesium oxychloride cement in hydrothermal environments,and has excellent acid-soluble propertiesafter adding 5%calcium carbonate.It provide a new temporary closure sealing technology for the pay formation inblocking or temporarily closing.

关 键 词：镁氧水泥 强度 暂闭 封堵 酸溶特性 

分 类 号：TE357[石油与天然气工程—油气田开发工程]