• 非常规天然气 • 上一篇
方朝合,黄志龙,王巧智,郑德温,刘洪林
FANG Chao-he,HUANG Zhi-long,WANG Qiao-zhi,ZHENG De-wen,LIU Hong-lin
摘要:
在页岩气开采过程中,需要对储层进行改造才能实现有效经济开采。目前北美和国内普遍采用的储层改造方法是水平钻完井结合大型水力压裂。开展入井流体与储层相互作用研究是提高储层改造成功的基础,而储层原始含水状态和成因研究则是开展上述工作的前提。通过对南方海相页岩储层研究发现,富含气页岩储层普遍存在超低含水饱和度现象,其成因主要有压实排水、生烃消耗和汽化携液排水等。超低含水饱和度增加了页岩吸附能力,延伸了可动孔喉范围,提高了气相渗透率,但在工程作业过程中加速了水相渗吸速率,强化了水相滞留效应,使页岩气藏水相圈闭损害潜力增大。在页岩气开发有利区评价、气藏改造及开发过程中,须加倍重视超低含水饱和度这一客观事实及其可能衍生的工程作业损害。
中图分类号:
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