The Transient Method and Experimental Study on Threshold Pressure Gradient of Heavy Oil in Porous Media
Z. X. Pang*, 1, H. Q. Liu2
Identifiers and Pagination:Year: 2012
First Page: 7
Last Page: 13
Publisher Id: TOPEJ-5-7
Article History:Received Date: 17/10/2011
Revision Received Date: 6/1/2012
Acceptance Date: 17/1/2012
Electronic publication date: 09/3/2012
Collection year: 2012
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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 non- Newtonian 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.