高埋深储层膏质泥岩蠕变力学特性试验研究
发布时间：2018-09-08 10:12
【摘要】：泥岩作为油气储层常见复杂介质,深部高温、高压环境下蠕变力学特性异常复杂,是引起套管损伤破坏的重要因素。以深部油气藏工程含膏质泥岩为研究对象;分别开展了温度为130℃、围压为30 MPa作用下三轴压缩和不同应力水平的三轴蠕变试验,结果表明,该泥岩呈非均质性不明显、具有较大塑性压缩和延性扩容变形、峰值强度略低等软岩力学特性;且轴向和侧向峰值应变达1.5%,峰值强度为74 MPa。泥岩力学特性表现出明显的时间效应,蠕变应力阀值较低;应力和持时对蠕变特性存在显著影响,低应力、长时间作用下泥岩亦呈现显著的稳态蠕变和加速蠕变破坏;且加速蠕变起始时间随应力增加呈指数降低关系;探讨了泥岩强度损伤和加速蠕变特性,认为泥岩内部蠕变损伤变量可用指数函数予以描述,且加速蠕变变形为应力与时间的二元指数函数。相关成果旨在为深部泥岩油气藏套管工程长期稳定分析及蠕变模型构建提供可靠的依据。
[Abstract]:As a common complex medium in oil and gas reservoir, mudstone is an important factor that causes casing damage and failure due to the unusual complexity of creep mechanical properties in deep high temperature and high pressure environments. Taking the gypsum mudstone of deep oil and gas reservoir engineering as the research object, triaxial creep tests with temperature of 130 鈩，
本文编号：2230217
[Abstract]:As a common complex medium in oil and gas reservoir, mudstone is an important factor that causes casing damage and failure due to the unusual complexity of creep mechanical properties in deep high temperature and high pressure environments. Taking the gypsum mudstone of deep oil and gas reservoir engineering as the research object, triaxial creep tests with temperature of 130 鈩，
本文编号：2230217
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