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Petroleum Science and Technology Volume 31, 2013 - Issue 18
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Original Articles

Wax Deposition in Pores and the Permeability Change for High-wax Crude in a Sandstone Reservoir

S. L. Yang Key Lab. of Petroleum Eng. of Ministry of Education, China University of Petroleum, Beijing, China
,
X. H. Wu Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
,
Y. X. Wang Key Lab. of Petroleum Eng. of Ministry of Education, China University of Petroleum, Beijing, China
,
X. Y. Yang Key Lab. of Petroleum Eng. of Ministry of Education, China University of Petroleum, Beijing, China
,
H. Chen Key Lab. of Petroleum Eng. of Ministry of Education, China University of Petroleum, Beijing, China
,
L. C. Li Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
,
X. Zhang Key Lab. of Petroleum Eng. of Ministry of Education, China University of Petroleum, Beijing, China
&
H. Lu Key Lab. of Petroleum Eng. of Ministry of Education, China University of Petroleum, Beijing, China
 show all
Pages 1891-1898 | Received 04 Apr 2011, Accepted 12 May 2011, Published online: 26 Jul 2013
 
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Abstract

Wax deposition in pay zone is an important factor that influences well productivity for high-wax crude oilfield. Taking Hongze oilfield as an example, rheological property of the crude and effective flow permeability at different temperature was measured. Flow pattern and process of wax deposition in porous medium was studied. Experiment results show that seepage flow of high-wax crude is significantly sensitive to temperature. It is non-Darcy flow and there exist threshold pressure gradient when temperature is lower than wax appearance temperature. According to experimental data, seepage flow and deposition patterns were proposed.

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