Petroleum Reservoir Evaluation and Development ›› 2023, Vol. 13 ›› Issue (3): 322-329.doi: 10.13809/j.cnki.cn32-1825/te.2023.03.007

• Methodological Theory • Previous Articles     Next Articles

Calculation and analysis of breakthrough pressure of caprock in CO2 storage

CUI Chuanzhi1(),LI Jinghong1,WU Zhongwei1,ZHANG Tuan1,ZHANG Chuanbao2   

  1. 1. Key Laboratory of Unconventional Oil and Gas Development, Ministry of Education, China University of Petroleum (East China), Qingdao, Shandong 266580, China
    2. Exploration and Development Research Institute, Sinopec Shengli Oilfield, Dongying, Shandong 257015, China
  • Received:2022-10-12 Online:2023-06-26 Published:2023-06-26

Abstract:

Cap rock is the most important geological structure in CO2 storage, and the characterization method of its sealing capacity is a hot research topic at present. Aiming at the problem of evaluating the sealing ability of caprock, based on the theory of coupling parallel capillary bundle and DLVO(microscopic force of charged surface passing through liquid medium), considering slip effect and water film effect, the theoretical calculation method of caprock breakthrough pressure is established, and the accuracy is verified with experimental data. The variation of breakthrough pressure with slip length and effective capillary radius is studied by analyzing the influencing factors. The results show that the relative error between the calculated breakthrough pressure and the experimental data of six core samples is between 0.317 % and 10.800 %. The smaller the slip length and the larger the effective capillary radius, the smaller the breakthrough pressure.

Key words: cap rock, breakthrough pressure, slip effect, water film, capillary radius

CLC Number: 

  • TE312