杨学锋,常程,程秋洋,谢维扬,胡浩然,张振宇

• 1:中国石油西南油气田公司页岩气研究院
• 2:页岩气评价与开采四川省重点实验室
• 3:重庆大学煤矿灾害动力学与控制全国重点实验室

摘要(Abstract)：

为探究页岩气层自支撑裂缝气-水流动规律,以四川盆地龙马溪组页岩为研究对象,开展了不同围压作用下页岩垂直和平行层理自支撑裂缝的气-水两相渗流试验。试验结果表明:页岩裂缝表面凸起高度呈高斯分布,随着自支撑裂缝表面凸起数量及高度的增加,等效缝宽和气/水绝对渗透率呈增加趋势;垂直层理裂缝表面粗糙程度高于平行层理裂缝,导致垂直层理裂缝导流能力普遍高于平行层理裂缝;相较于拉张型裂缝,垂直层理剪切型裂缝绝对渗透率升高了3～10倍,平行层理剪切型裂缝绝对渗透率升高了2～4倍;水相流体相对渗透率与水相分流量正相关,水相分流量较高时,水相受到围压以及裂缝表面形貌的影响明显高于气相,裂缝等渗点相对渗透率随着围压升高而降低,随着粗糙度升高而降低。相较于拉张型裂缝,剪切型裂缝内相间阻力降低,水相相对渗透率相较气相升高更加明显,等渗点水相分流量未发生明显变化,垂直层理剪切型裂缝等渗点相对渗透率升高1.39～1.71倍,平行层理剪切型裂缝等渗点相对渗透率升高1.02～1.39倍。研究认识对于指导考虑自支撑缝网导流能力保护的页岩气井控压生产制度优化具有重要意义。

关键词(KeyWords)： 页岩;自支撑裂缝;气-水流动;表面粗糙度;相对渗透率

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气集团公司科技专项资助项目(2023ZZ21);; 中国石油西南油气田公司博士后科研资助项目(20230304-13)

作者(Author): 杨学锋,常程,程秋洋,谢维扬,胡浩然,张振宇

DOI: 10.13532/j.jmsce.cn10-1638/td.2024-1275

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