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OALib Journal期刊
ISSN: 2333-9721
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回压应力敏感性评价测试方法研究
Keywords: 评价,回压,应力敏感,净应力,上覆压力,渗透率变化率
Abstract:
？为了寻求回压应力敏感性评价合理的测定方法，对现行部颁标准中的方法进行详细分析，并指出其存在的问题，分析认为:现行部颁标准和原标准相比有改进，但仍不具体，仅对围压作了规定，测定结果不能排除净围压变化的影响，在气藏实际开采过程中，井底压力降低导致的有效应力变化由近井地带向远处延伸，并在压降漏斗控制下越来越弱。基于上述分析，设计出一套测定回压应力敏感性的方法，该方法要求围压和上游压力恒定，并分别等于实际储层上覆压力和原始地层压力，回压从原始地层压力降低至废弃压力，分别测定各回压下渗透率变化情况，通过将该方法应用到致密砂岩，测得渗透率伤害率为21%左右，弱敏感，实验曲线分为陡峭段和平缓段，存在拐点，测定结果符合预期，可以将该方法推广到以后的实验和研究中。？
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