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Rheological Model and Transition Velocity Equation of a Polymer Solution in a Partial Pressure Tool

1
Key Laboratory of Enhanced Oil Recovery (Northeast Petroleum University), Ministry of Education, College of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
2
Post-Doctoral Scientific Research Station, Daqing Oilfield Company, Daqing 163413, China
3
Research Institute of Production Engineering, Daqing Oilfield, Daqing 163453, China
4
Aramco Asia, Beijing 100102, China
5
NO.2 Oil Production Company, Daqing Oilfield, Daqing 163453, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(5), 855; https://doi.org/10.3390/polym11050855
Received: 27 March 2019 / Revised: 5 May 2019 / Accepted: 8 May 2019 / Published: 10 May 2019
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Abstract

In order to solve the problem of the low production degree of oil layers caused by an excessively large permeability difference between layers during polymer flooding, we propose partial pressure injection technology using a partial pressure tool. The partial pressure tool controls the injection pressure of a polymer solution through a throttling effect to improve the oil displacement effect in high- and low-permeability reservoirs. In order to analyze the influence of the partial pressure tool on the rheological property of the polymer solution, a physical model of the tool is established, the rheological equation of the polymer solution in the partial pressure tool is established according to force balance analysis, the transition velocity equation for the polymer solution is established based on the concept of stability factor, and the influence of varying the structural parameters of the partial pressure tool on the rheological property of the polymer solution is analyzed. The results show that the pressure drop of the polymer solution increases with the decrease of the front groove angle of the partial pressure tool (from 60° to 30°), reaching a maximum of 1.77 MPa at a front groove angle of 30°. Additionally, the pressure drop of the polymer solution increases with the decrease of the outer cylinder radius (from 25 to 24 mm), reaching a maximum of 1.32 MPa at a radius of 24 mm. However, the apparent viscosity of the polymer solution before and after flowing through the partial pressure tool does not change for any of the studied parameters. These research results are of great significance to research on partial pressure injection technology and enhanced oil recovery. View Full-Text
Keywords: partial pressure tool; rheological equation; transition velocity; pressure drop; apparent viscosity partial pressure tool; rheological equation; transition velocity; pressure drop; apparent viscosity
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Huang, B.; Hu, X.; Fu, C.; Liu, C.; Wang, Y.; An, X. Rheological Model and Transition Velocity Equation of a Polymer Solution in a Partial Pressure Tool. Polymers 2019, 11, 855.

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