超低渗透裂缝介质储层应力敏感性定量研究

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摘要为量化表征微裂缝对超低渗透储层应力敏感特征的影响，通过引入单一裂缝介质渗透率应力敏感的数学理论模型，从裂缝介质变形的机制上定量分析裂缝性低渗透储层的应力敏感特征；然后采用巴西试验制备的拉张应力微裂缝岩芯，实施微裂缝岩芯应力敏感性试验，进行应力敏感性评价；最后对比模型计算的理论曲线与试验数据。结果表明：(1) 理论模型定量解释了裂缝介质的应力敏感特征及其与微裂缝含量、表面粗糙程度等的关系。理论模型的应力敏感曲线具有裂缝储层的应力敏感特征；(2) 制备的微裂缝岩芯能够近似地模拟微裂缝介质储层的真实情况，能够用于微裂缝岩芯应力敏感试验；(3) 对岩石进行应力敏感性评价时，应以地层压力条件下的渗透率为初值，否则会夸大岩石的应力敏感性；微裂缝岩芯渗透率应力敏感滞后程度不明显，应力卸载后渗透率恢复程度高，不存在强的应力敏感性；(4) 理论曲线与试验数据具有很好的一致性，说明理论模型能够比较准确的定量揭示裂缝储层的应力敏感特征。

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关键词 ：岩石力学, 裂缝介质, 应力敏感性, 超低渗透, 微裂缝岩芯, 巴西试验

Abstract：In order to quantitatively describe the effect of microfractures on the stress sensitivity features of ultra low permeability reservoir，the stress sensitivity features of ultralow permeability fracture media from the mechanism of fracture medium deformation were analyzed by introducing a permeability stress sensitive theoretical model of single fracture. Then the experiment of stress sensitivity was conducted with microfracture cores fabricated by Brazil experiment and the features of permeability stress sensitivity were analyzed. Finally，the experimental data were contrasted with the theoretical curves. Results indicate that：(1) The theoretical curves quantitatively reveal the stress sensitivity features and the relationships with the microfracture content and roughness；the curves have the stress sensitivity features of fracture media reservoir. (2) The fabricated microfractures can proximately simulate the real situations of microfracture media reservoir and be used in the experiment. (3) The evaluation of stress-dependent permeability of cores should begin with the in-situ stress，or it would be overestimated；the permeability hysteresis loss of tensile-stress microfracture core is smaller and the permeability recovery degree is high so the permeability stress sensitivity is not strong；(4) The theoretical curve accords with the experimental data well，which indicates that the theoretical model can reveal the stress sensitivity characteristics of ultralow permeability fracture media accurately.

Key words： rock mechanics fracture media stress sensitivity ultra low permeability microfracture cores Brazil experiment

收稿日期: 2012-11-24

引用本文:

张海勇1，何顺利1，栾国华1，2，焦春艳1，3，莫邵元1，刘浩1. 超低渗透裂缝介质储层应力敏感性定量研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3349-3354.
ZHANG Haiyong1，HE Shunli1，LUAN Guohua1，2，JIAO Chunyan1，3，MO Shaoyuan1，LIU Hao1. QUANTIFATIVE STUDY OF STRESS SENSITIVITY IN ULTRALOW PERMEABILITY FRACTURE MEDIA RESERVOIR. , 2014, 33(sl): 3349-3354.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3349

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