Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 91-102.doi: 10.12108/yxyqc.20180511

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Control effect of pore structure modality on remaining oil in glutenite reservoir: a case from lower Karamay Formation in block Qidong 1 of Karamay Oilfield

YIN Senlin1, CHEN Gongyang1, CHEN Yukun2, WU Xiaojun2   

  1. 1. Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou 434023, Hubei, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2018-02-24 Revised:2018-05-25 Online:2018-09-14 Published:2018-09-14

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Abstract: The control effect of complex pore structure of glutenite reservoirs on remaining oil is very complicated and not clear. In this paper,based on the analysis data of 325 experimental samples,the control effect of complex pore structure modality on residual oil in water/polymer flooding is examined by means of large casting thin section,nuclear magnetic complex pore structure resonance and CT three-dimensional pore structure scanning. The results show that:(1) The distribution of remaining oil in water/polymer flooding follows some obvious patterns. The reservoirs with oil saturation in the range of 50% to 100% are displaced first, seeing quick decline in proportion.(2) In the middle and late stages of polymer flooding,some of the fluid advantage channels formed at the stage of water flooding, and the piston-type drive results in a large part of reservoirs with oil saturation in the range of 37.5% to 50.0% to be produced;the remaining oil is mainly in isolated distribution, and only in connected pieces in local parts.(3)Different pore structure modalities result in quite different oil displacement effects in water flooding/polymer flooding. The flooding efficiency in cores with single modality and dual modalities is higher,and the oil displacement efficiency of polymer is 9.30% to 18.38% after water flooding. Water flooding efficiency of single-modality core is the highest,while water flooding efficiencies of the dual-modality and complex modality cores are similar. The displacement efficiency with polymer is the highest in dual-modality cores, followed by single modality cores. The water content decreases by 20% after the cores with single-modality and dual-modality are injected with polymer.

Key words: complex modality, glutenite, polymer flooding, remaining oil, alluvial fan, Karamay Oilfield

CLC Number: 

  • TE122
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