西南石油大学学报(自然科学版)

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NMR Analysis of Movable Remaining Oil of Low Pemeability Reservoir

LI Haibo1,2,3*, GUO Hekun1,3, ZHOU Shangwen1, MENG Zhiqiang2,3, WANG Xuewu1,3   

  1. 1. Langfang Branch,PetroChina Research Institute of Petroleum Exploration & Development,Langfang,Hebei 065007,China
    2. University of Chinese Academy of Sciences,Shijingshan,Beijing 100049,China
    3. Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Sciences,Langfang,Hebei 065007,China
  • Online:2016-02-01 Published:2016-02-01

Abstract:

This study analyzes oil-water saturation of reservoir and high-speed centrifugal oil-water displacement experiment
by NMR respectively aiming at representative Parallel cores form sealed coring,and establishes NMR method for reservoir
movable remaining oil saturation analysis through quantitatively comparing parameters,which include reservoir remaining oil
saturation at present,relative quantity of produced oil,movable oil saturation and upper efficiency of oil displacement. The
research shows that the best centrifugal forces to set up saturated oil bound water state and to drive oil are 2.250 MPa and
0.220 MPa respectively. For four permeability level(>50、[10,50)、[1,10)and <1 mD)reservoir,produced oil saturation
are 23.49%,16.81%,8.70% and 9.99% respectively;movable oil saturation are 50.34%,43.76%,29.67% and 22.89% respectively,
and movable remaining oil saturation are 26.85%,26.95%,20.97% and 12.90% respectively. Produced oil saturation
of reservoir above 10 mD is higher than that of reservoir less 10 mD,which is obviously due to reservoir heterogeneity,but
movable remaining oil saturation of reservoir greater than 10 mD is higher because of its higher movable oil saturation. Movable
remaining oil saturation of reservoir less than 1 mD is lower than that of other reservoirs evidently.

Key words: low pemeability reservoir, high speed centrifugation, NMR, movable remaining oil, heterogeneity

CLC Number: