Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (5): 111-115.doi: 10.3969/j.issn.1673-8926.2012.05.021

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Study on gas-oil diffusion coefficient in porous media under high temperature and high pressure

YE Anping1， GUOPing1， WANGShaoping2， XU Yanmei3， CHENGZhongzhao4   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China； 2. No.2 Oil Production Plant， PetroChina Changqing Oilfield Company， Qingyang 745100， China； 3. Langfang Branch, PetroChina Research Institute of Exploration & Development， Langfang 065007， China； 4. Xi’an Changqing Technology & Engineering Company Ltd.， Xi’an 710018， China
  • Online:2012-10-20 Published:2012-10-20

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Abstract:

The study ofmolecular diffusion coefficient for gas-oil systemfocuses mostly on the single gas-oil system, and the diffusion coefficient is measured in the PVT tube under lowpressure or lowtemperature. Under the circumstances, this paper tested the effective diffusion coefficient between the gas injected and oil in porous media under high temperature and pressure, and also tested the diffusion coefficient of gas-condensate oil systemand gas-heavy crude oil systemin the full diameter core under 60℃and 20MPa respectively. The results showthat the components of crude oil have a little influence on the diffusion coefficient. The gas diffusion coefficient in condensate oil is higher than that in heavy oil. The diffusion coefficient follows a power function and increases with the increasing of time, and the curve flattens gradually finally.

Key words: frequency attenuation attributes, deep carbonate rock, oil and gas exploration

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