岩性油气藏 ›› 2021, Vol. 33 ›› Issue (3): 145152.doi: 10.12108/yxyqc.20210315
许飞
XU Fei
摘要: 裂缝-基质之间矿化度差异引起的化学渗透压对页岩压裂液返排和气井产能计算有着重要的影响。通过建立考虑化学渗透压作用下的渗吸动力模型,描述页岩自发渗吸过程中的驱动力类型。以鄂尔多斯盆地本溪组页岩为研究对象,开展页岩自发渗吸核磁扫描实验,研究黏土矿物、矿化度和表面活性剂对含水饱和度分布的影响。并以实验测定的含水饱和度分布曲线为拟合目标,获得了兼具毛管压力和化学渗透压双重作用下的毛管压力曲线。结果表明,页岩在自发渗吸过程中,随着渗吸时间的增加,吸水量呈现先快速增加后逐渐变缓的趋势,而渗吸速率则快速下降。页岩中黏土矿物含量越高、裂缝-基质间化学势差越大,渗吸驱动力越强,渗吸前缘距离和吸水量越大,而表面活性剂会降低毛管压力,引起驱动力下降,导致渗吸效果大幅降低。将修正后的毛管压力曲线应用于页岩气井产量预测,大幅提高了模型的计算精度。该研究成果为鄂尔多斯盆地页岩气藏高效开发提供了方法和依据。
中图分类号:
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