西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (3): 105-108.

• 石油与天然气工程 • Previous Articles     Next Articles

Long-core Experimental Study on Advance Water Injection of Extra-low Permeability Reservoir

ZHAO Chun-peng 1，2 YUE Xiang-an 1
  

  1. 1. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Changping, Beijing 100249, China;
    2. Petroleum Exploration and Production Research Institute, SINOPEC, Haidian, Beijing 100083, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-20 Published:2011-06-20

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Abstract: In order to study the advanced water injection of extra-low permeability reservoir, including pressure transmission characters, the level of formation pressure and reasonable working time of production well, we design long-core physical simulation equipment with multi-pressure measurement nodes and use extra-low permeability long cores. The experiment results show that higher recovery ratio should be obtained when the formation pressure between 110%_120%of initial formation pressure. When the pressure spread to 30%of the distance is between water

well and oil well, it is the reasonable well opening time. The velocity of pressure propagation trend to decrease as the core length increase, so we suggest that water intake per unit thickness should match with the velocity of pressure propagation, and flooding should enhance properly at initial stage, which is beneficial for establishing a displacement pressure system as quickly as possible. Flooding should be reduced properly at later stage, in order to achieve the best flood effectiveness.

Key words:

extra-low permeability, advance water injection, long core, pressure maintenance level, water intake per unit thickness

CLC Number: