天然气地球科学 doi: 10.11764/j.issn.1672-1926.2017.05.009

• 天然气开发 • 上一篇    下一篇

页岩气藏自然返排缓解水相圈闭损害实验研究

康毅力1,张晓怡1,游利军1,陈强1,张杜杰1,崔忠余1,2   

  1. 1.西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500;
    2.富象油气有限公司,辽宁 盘锦 124013
  • 收稿日期:2016-10-19 修回日期:2017-05-19 出版日期:2017-06-10 发布日期:2017-06-10
  • 作者简介:康毅力(1964-),男,天津蓟县人,教授,博士,博士生导师,主要从事储层保护理论及技术、非常规天然气、油气田开发地质的研究与教学工作.E-mail:cwctkyl@vip.sina.com.
  • 基金资助:

    国家自然科学基金项目(编号:51674209);国家科技重大专项“彭水地区常压页岩气开发技术与政策研究”(编号:2016ZX05061003);非常规油气层保护四川省青年科技创新研究团队项目(编号:2016TD0016)联合资助.

The experimental research on spontaneous flowbackrelieving aqueous phase trapping damage in shale gas reservoirs

Kang Yi-li1,Zhang Xiao-yi1,You Li-jun1,Chen Qiang1,Zhang Du-jie1,Cui Zhong-yu1,2   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;
    2.Rich as Oil and Gas Limited Company,Panjin 124013,China
  • Received:2016-10-19 Revised:2017-05-19 Online:2017-06-10 Published:2017-06-10

摘要:

水平井分段压裂是页岩气藏开发的主要技术手段。然而,页岩纳米孔与微裂缝的毛管自吸作用往往导致压裂液返排困难,滞留压裂液对页岩气解吸_扩散_渗流过程潜在损害严重。为深化页岩气藏压裂液返排与及其水相圈闭损害动态变化的认识,利用川东龙马溪组页岩样品,在岩心柱尺度上实验模拟增产改造时压裂液自吸—返排过程,讨论了孔隙结构、裂缝发育情况、返排压差及时间影响自吸_返排效果的机理。结果表明:孔隙半径越小,毛管力越大,页岩自吸速率越大,水相返排效果越差;自吸诱发页岩产生裂缝,增大了气相渗流通道,促进了滞留水相返排;返排压差、返排时间与水相返排效果呈正相关关系,在返排压差0.2MPa和1.0MPa条件下先后各返排12h,水相最大返排率约为46%,最大渗透率恢复率约为67%。分析表明:页岩气藏潜在水相圈闭损害严重,滞留水相的返排有利于增强页岩气渗流能力。

关键词: 页岩气, 页岩, 气藏, 储层损害, 水相圈闭, 压裂液

Abstract:

Horizontal well staged fracturing is the main technical means of shale gas reservoir reformation.The flowback rate of fracturing fluid is low in shale gas reservoir.The retained fracturing fluid in nanopore and microcrack seriously affects the desorption-diffusion-permeability of shale gas.Spontaneous imbibition and flowback experiment swere carried out on the shale of Longmaxi Formation in the eastern Sichuan Basin to reveal the characteristics of fracturing fluid flowing back and the change of aqueous phase trapping damage.The effects of pore structure,fracture,flowback pressure and time on spontaneous imbibition and flowback behavior were evaluated.Results show that,the smaller the pore radius,the greater the capillary force,the higher the spontaneous imbibition rate and the poorer the flowback effect.Aqueous phase spontaneous imbibition can induce cracks in shale,which increased the channel of permeability and promoted aqueous phase flowback.Flowback pressure and flowback time have a positive correlation with the flowback effect of aqueous phase,and after 24 hours of flowback,the maximum flowback rate is 46% and permeability recovery rate is 67%.This paper draws the conclusion that,the potential aqueous phase trapping damage of shale gas reservoirs is severe,and reduce aqueous phase in shale benefits to improve permeability of shale gas.

Key words: Shale gas, Shale, Gas reservoir, Formation damage, Aqueous phase trap, Fracturing fluid

中图分类号: 

  • TE34

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