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科技导报  2014 

砂岩地层井壁稳定性分析

DOI: 10.3981/j.issn.1000-7857.2014.2.005, PP. 34-36

Keywords: 井壁稳定,砂岩,蠕变,西原模型

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Abstract:

南海某油田深部地层砂岩存在因蠕变导致的缩径现象,有必要分析该油田砂岩地层蠕变性质,为砂岩地层安全钻井提供借鉴。使用某油田深部地层砂岩岩心进行室内蠕变实验,测定不同差应力下岩心蠕变率。使用西原模型拟合了实验结果,拟合精度较高,并计算了某油田砂岩缩径井段安全钻井周期。计算结果表明,提高钻井液密度可大幅提高安全钻井周期,也可采用定期起下钻、下套管封固缩径井段等工程措施阻止或减缓砂岩蠕变。

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