Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 135-143.doi: 10.12108/yxyqc.20200115

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Microscopic water flooding efficiency and main controlling factors of tight sandstone reservoir

SONG Mingming1, HAN Shuqiao2, DONG Yunpeng1, CHEN Jiang3, WAN Tao1   

  1. 1. No.5 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710000, China;
    2. No.;
    3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan 750006, China;
    3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710000, China
  • Received:2019-06-04 Revised:2019-08-21 Online:2020-01-21 Published:2019-11-22

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Abstract: Aiming at the problems of low single well production,fast water cut rise and complex residual oil distribution during the water flooding of Chang 7 reservoir in Wuqi Oilfield,Ordos Basin,microscopic water flooding seepage experiment was carried out on real core samples of Chang 7 reservoir in the study area by using selfdesigned high-temperature and high-pressure micro-model holder. Combined with cast thin slice analysis,scanning electron microscopy,X-ray diffraction,high pressure mercury penetration and NMR testing,the microscopic water flooding seepage characteristics under different pore structure types were studied. The effects of reservoir physical properties,microscopic pore structure,movable fluid parameters,clay minerals,displacement pressure and water injection volume on water flooding efficiency were discussed. The results show that the characteristics of microscopic water flooding of Chang 7 reservoir are mainly reticular displacement and dendritic displacement,followed by uniform displacement and rare serpentine displacement. There are great differences in displacement efficiency and residual oil distribution among different types of displacement characteristics. The displacement efficiency of uniform displacement is the highest(48.84%),and that of serpentine displacement is the lowest(31.73%). 75% of the remaining oil occurs in the pore throat as clusters and oil films. There are many factors affecting water flooding efficiency,among which movable fluid parameters are more accurate than other physical parameters to reflect the relationship with oil displacement efficiency. The research results provide a theoretical basis for the adjustment of the development schemes of different reservoir types.

Key words: microscopic model, pore structure, movable fluid parameter, displacement efficiency, Ordos Basin

CLC Number: 

  • TE341
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