Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 121-132.doi: 10.12108/yxyqc.20190413

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Comparison of glass etching displacement experiment and finite element numerical simulation for gas-water two-phase seepage in rocks

WU Feng1,2, YAO Cong1, CONG Linlin3, YUAN Long4, WEN Zhu5, ZHANG Fengsheng4, XI Yanping1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. Yanchang Oil Field Co., Ltd., Yan'an 716000, Shaanxi, China;
    4. Logging Application Research Institute, CNPC Logging, Xi'an 710077, China;
    5. No.1 Mudlogging Company, Bohai Drilling Engineering Company, CNPC, Tianjing 300280, China
  • Received:2018-12-27 Revised:2019-03-15 Online:2019-07-21 Published:2019-06-21

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Abstract: The study of rock micro-visualization two-phase seepage characteristics is of great significance to the development of oil and gas fields. The dynamic seepage characteristics of micro gas-water two-phase fluids in rocks were studied by means of micro visual glass etching displacement experiment and finite element numerical simulation respectively,and the results of finite element numerical simulation were verified by micro-glass etching displacement experiment. The results show that the finite element numerical simulation results are basically consistent with the experimental results of glass etching displacement. There are obvious fingering phenomena in gaswater two-phase flow displacement experiment process. After displacement,water distributed in the large throats and the hole connected with the large throats was displaced by gas,while the irreducible water was mainly distributed in the small throats and macropores controlled by the small throats and blind end of the pore. When the one-phase seepage reached steady state,the flow velocity in the center of the flow channel was higher than that at the entrance. The greater the pore throat radius,the slower the pressure drop. The micro glass etching displacement experiment method can better observe micro-fingering phenomenon and gas migration jump phenomenon when passing through narrow throat,while the finite element numerical simulation method has many advantages, such as low cost,easy operation and high repeatability. The combination of micro glass etching displacement experiment method and finite element numerical simulation method is more effective in studying the seepage of gas-water two-phase fluid in rock pores.

Key words: two-phase flow displacement, glass etching, finite element simulation, Navier-Stokes equations

CLC Number: 

  • TE341
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