Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (2): 114-117.doi: 10.3969/j.issn.1673-8926.2011.02.022

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Imbibition is not caused by capillary pressure

LI Chuanliang1， LI Dongmei2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China； 2. Research Institute of Engineering and Technology， Northwest Oilfield Company， Sinopec， Urumqi 830011， China
  • Online:2011-04-20 Published:2011-04-20

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Abstract:

Imbibition is an effective method to flood the oil in matrix pores of reservoirs. However, the mechanism of imbibition is not understood properly and correctly. A study was made about the mechanism of imbibition with the principles of flow in porous media. The driving force of imbibition is buoyancy rather than capillary pressure. On the contrary, capillary pressure is the resistance of imbibition. Surfactants added to injection water can reduce capillary pressure and increase the efficiency of oil recovery. The mechanismof imbibition is the gravity separation of oil and water in pores, which needs long time to finish the process. Interval water flooding, periodical water flooding and low speed water flooding are good methods to recover oil by imbibition.

Key words: CO2, expansion test, relative volume, supercritical state, viscosity

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