The Transient Method and Experimental Study on Threshold Pressure Gradient of Heavy Oil in Porous Media
نویسندگان
چکیده
On the basis of flow characteristics and material balance principle, a one-dimensional theoretical model of heavy-oil migration in porous media was established. The model considered micro-compressible property and nonNewtonian behavior of heavy oil. A new method, the transient method, was introduced to calculate the threshold pressure gradient in porous media. The method was designed to measure the inlet pressure of porous media during experiments. Finally, the threshold pressure gradient was worked out according to the mathematical model. The threshold pressure gradient of heavy oil was more accurate by the transient method than the steady state method. The threshold pressure gradients of three oil samples in different permeable porous media were measured according to the transient method. The experimental results showed that heavy oil migration was influenced by petroleum composition and pore structure of porous media. The threshold pressure gradient gradually decreased as temperature and permeability increased in porous media.
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