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高煤级煤储层渗透性与应力耦合模型及控制机理

DOI: 10.6038/cjg20130231, PP. 667-675

Keywords: 煤储层,渗透性,应力,耦合关系,作用机理

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Abstract:

煤储层应力敏感性是影响煤层气井产能的地质因素,以鄂尔多斯盆地东南缘高煤级煤储层为对象,通过煤样的应力敏感性实验和现场测试,建立了高煤级煤储层渗透性与应力之间的相关关系和模型;探讨了渗透性变化的控制机理.研究结果表明,煤储层渗透率随应力的增加按负指数函数规律降低.在应力小于5MPa时,煤储层渗透率随应力增加快速下降,应力敏感性最强;应力在5~10MPa时,渗透率随应力增加而较快下降,应力敏感性较强;而当应力大于10MPa后,渗透率随应力的增加下降速度减缓,应力敏感性减弱.与沁水盆地南部高煤级煤样实验结果对比认为,鄂尔多斯盆地东南缘山西组2煤层应力敏感性要小于沁水盆地南部山西组3煤层的应力敏感性.煤储层渗透性是在应力作用下煤储层中裂隙产生压缩(压密)变形,裂隙开度急剧减小的结果.因此在煤层气开发过程中控制排采速度,尤其是排采早期降液速度,对于防止煤储层应力敏感性,提高采收率具有实际意义.

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