Enhancing heavy‐oil displacement efficiency through viscoelasticity of polymer solution by investigating the viscosity limit of crude oil: An experimental study

Author:

Xue Xinsheng12,Zhu Shijie13ORCID,Ma Xinjian3,Zhang Shilun12,Yang Shuanglai3,Huang Zhuangzhuang3,Xu Mei3,Huang Huirong3

Affiliation:

1. State Key Laboratory of Offshore Oil Exploitation Beijing China

2. China National Offshore Oil Corporation (CNOOC) Research Institute Ltd. Beijing China

3. Chongqing University of Science & Technology Chongqing China

Abstract

AbstractThe world is rich in ordinary heavy‐oil resources. Exploring the limit of the crude oil viscosity limits can further expand the application of polymer flooding technology in heavy‐oil reservoirs and improve the development efficiency of heavy‐oil reservoirs. On the basis of the polymer flooding that has been implemented in the Bohai offshore oilfield, this study characterized the in situ viscoelasticity of the polymer solution SNF3640C. We compared the polymer flooding and glycerol flooding performance in low‐viscous oil reservoirs (with a viscosity of 6.5 cp) and high‐viscous oil reservoirs (with a viscosity of 65 cp) by conducting microscopic dead‐end experiments and macroscopic core‐flooding experiments, and then analyzing the impact of polymer's viscoelasticity on the oil displacement efficiency of heavy oil. Finally, multiple crude oils with a wide range of viscosity were used to explore the crude oil viscosity limits under which the efficiency of heavy‐oil displacement could be improved through polymer viscoelasticity. The results demonstrate that: (1) the SNF3640C polymer solution can exhibit a certain degree of viscoelasticity in deep formation. At a distance of 140 m from the wellbore in the reservoir, a solution with a concentration of 1500 mg/L can still have a first normal stress difference of 2.5 Pa. Polymers can effectively improve the efficiency of heavy‐oil displacement through elastic action. (2) The viscosity limit that can improve the efficiency of heavy‐oil displacement under current experimental conditions does not exceed 5486 cp. The efficiency of polymer flooding for crude oil has decreased to 31.68%, and the contribution of elastic flooding is only 1.5%. The research method of using viscous glycerol as a comparison to demonstrate the contribution of polymer elasticity to oil displacement effectiveness effectively solves the problem of isolating the contribution by polymer solution's viscosity and elasticity, and clarifies the development direction of polymer flooding for developing heavy crude oil. Enhancing the elastic effect of polymer solution in porous media can increase the viscosity range of polymer flooding heavy oil.

Publisher

Wiley

Reference32 articles.

1. Collaborative methods in enhanced cold heavy oil production

2. Limited resources unlimited innovation challenge limits—visit Sun Huanquan, an academician of the Chinese Academy of Engineering and deputy chief engineer of Sinopec;Tang DL;China Pet Enterp,2022

3. Classofocation of reserves and contingent resources of offshour oil and gas resources;Zhao PF;Mar Geol Front,2020

4. Research on optimal timing range for early polymer injection in sandstone reservoir

5. A New Approach to Polymer Flooding: Effects of Early Polymer Injection and Wettability on Final Oil Recovery

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