西南石油大学学报(自然科学版) ›› 2021, Vol. 43 ›› Issue (1): 120-132.DOI: 10.11885/j.issn.1674-5086.2019.09.17.03

• 石油与天然气工程 • 上一篇    下一篇

含水富有机质页岩重复升温热激增渗实验

游利军, 李鑫磊, 康毅力, 陈明君, 郝志伟   

  1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川 成都 610500
  • 收稿日期:2019-09-17 出版日期:2021-02-10 发布日期:2021-01-23
  • 通讯作者: 游利军,E-mail:youlj0379@126.com
  • 作者简介:游利军,1976年生,男,汉族,河南洛阳人,教授,博士生导师,主要从事储层保护、非常规油气、岩石物理方面的教学和科研工作。E-mail:youlj0379@126.com
    李鑫磊,1996年生,男,汉族,陕西西安人,硕士研究生,主要从事储层保护、非常规天然气和页岩高温热处理等方向研究。E-mail:swpulxl@foxmail.com
    康毅力,1964年生,男,汉族,天津蓟县人,教授,博士生导师,主要从事储层保护理论与技术、非常规天然气和油气田开发地质方向科研与教学。E-mail:cwctkyl@163.com
    陈明君,1988年生,男,汉族,重庆荣昌人,讲师,博士,主要从事储层保护、非常规气藏多尺度输运、高温高压岩石热物理等方面的工作。E-mail:chenmj1026@163.com
    郝志伟,1989年生,男,汉族,河北邢台人,博士研究生,主要从事储层保护、非常规天然气和高温高压岩石热物理等方面的研究。E-mail:swpuhzw@foxmail.com
  • 基金资助:
    国家自然科学基金(51674209);非常规油气层保护四川省青年科技创新团队项目(2016TD0016);中国博士后科学基金(2017M623062)

An Experimental Study on Cyclical Thermal Stimulation to Enhance Permeability of Water-bearing Organic-rich Shale

YOU Lijun, LI Xinlei, KANG Yili, CHEN Mingjun, HAO Zhiwei   

  1. State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2019-09-17 Online:2021-02-10 Published:2021-01-23

摘要: 水力压裂可提高页岩气井产量,但改造尺度多集中于毫米级裂缝,难以沟通微纳孔隙和天然微裂缝,且压后大量压裂液滞留易形成水相圈闭损害,阻碍气体多尺度传输。选取四川盆地下志留统龙马溪组富有机质页岩,模拟水力压裂后页岩储层热处理,开展了加热速率为5 ℃/min干燥页岩重复升温与加热速率为10 ℃/min含水页岩重复升温热激实验,监测了富有机质页岩加热过程中颜色、质量、渗流能力和纵横波速率。研究表明,加热过程中富有机质页岩表观颜色变浅;干燥页岩在600~700 ℃渗透率改善较为明显,渗透率增加了3~5倍;含水页岩渗透率在加热至200~300 ℃时显著提高,纵横波速率整体呈降低的趋势,降低幅度比干燥页岩更大。水岩相互作用、热蒸气压和加热速率引发的空间应力是降低含水页岩热致裂增渗阈值温度的有利条件。

关键词: 富有机质页岩, 气体渗透率, 热激, 增渗, 阈值温度

Abstract: Hydraulic fracturing can improve the production of shale gas wells, but its modification scale is mostly concentrated in millimeter-scale cracks. It is difficult to connect micro-nanopores and natural cracks, and a large number of fracturing fluids remained in formation tend to form water phase trapping damage. Organic-rich shale of the lower silurian Longmaxi formation in the Sichuan Basin was selected to simulate heat treatment of shale gas reservoir after hydraulic fracturing. Heating experiments on dry shales with the heating rate of 5℃/min and water-bearing shale with 10℃/min were carried out to monitor parameters such as color change, mass loss, seepage capacity, and wave velocity. Results have shown that color of organic-rich shale turns lighter when temperature rises. Gas permeability increases 3~5 times when dry shales are heated at 600~700℃. Permeability of water-bearing shale improves more significantly after heating at 200~300℃. Wave velocity decreases more after water-bearing shale heating than that of dry shales. Water-rock interaction, hot vapor pressure and spatial thermal stress change induced by heating rate are favorable conditions for reducing threshold temperature of shale.

Key words: organic-rich shale, gas permeability, thermal stimulation, permeability improvement, threshold temperature

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