页岩应力敏感性分析研究

Study of the Shale Stress Sensitivity Experimental

为了在页岩油气开发过程中尽可能减少各类敏感性对页岩开发的影响,针对页岩的应力敏感性问题,本文综合行业标准法和应力敏感性系数法对页岩岩心试验数据进行页岩应力敏感性分析评价。结果表明:Y-1岩心应力敏感性系数为0.75,评价结果为强敏感性;Y-2岩心应力敏感性系数为0.3,评价结果为中等偏弱敏感性;Y-3岩心应力敏感性系数为0.58,评价结果为中等偏强敏感性。由此说明微裂缝发育较差的页岩有较强的应力敏感性。以上认识对延长油田页岩储层敏感性深化研究及对页岩油气开发具有一定指导意义。

In order to minimize the impact of various sensitivity on shale development in the process of shale oil and gas development,in view of the stress sensitivity of shale,the stress sensitivity of shale core experimental data was studied.The results showed that the stress sensitivity coefficient of Y-1 core is 0.75,the evaluation result is strong sensitivity.The stress sensitivity coefficient of Y-2 core is 0.3,the evaluation result is medium weak sensitivity.The stress sensitivity coefficient of Y-3 core is 0.58,and the evaluation result is medium strong sensitivity.This showed that shale with poor microfracture development has strong stress sensitivity.The above understanding has certain guiding significance for deepening research on shale reservoir sensitivity and shale oil and gas development in Yanchang oilfield.