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Optimization Strategy to Reduce Asphaltene Deposition-Associated Damage During CO\(_2\) Huff-n-Puff Injection in Shale

  • Ziqi Shen
  • James J. Sheng
Research Article - Petroleum Engineering

Abstract

CO\(_2\) huff-n-puff injection has been proved an efficient and applicable method to enhance oil recovery in shale. However, the asphaltene precipitation and deposition in such injection process have not been considered in previous studies. In this paper, a numerical reservoir simulation method was applied to mimic CO\(_2\) huff-n-puff injection process and CO\(_2\)-associated asphaltene precipitation and deposition in a hydraulically fractured shale oil reservoir. Effects of CO\(_2\) huff-n-puff injection operational parameters including huff pressure, puff pressure, huff time, and puff time on asphaltene deposition and associated oil production loss were examined in detail. The numerical reservoir simulation modeling study provides a better understanding of the physical mechanisms and key parameters affecting the asphaltene deposition and the oil production loss during CO\(_2\) huff-n-puff injection in hydraulically fractured shale formation. The results show that the asphaltene precipitation and deposition behaviors in the rock matrix and fracture network are different, resulting in a difference in permeability reduction. In the fracture network, most of the asphaltene precipitation and deposition is formed during the puff period, while in the rock matrix, the asphaltene precipitation and deposition is formed during both the huff period and the puff period. It was found that optimization strategies such as reducing huff time and increasing the puff time are favorable for decreasing the reduction in oil recovery caused by asphaltene deposition; although higher huff pressure causes more reduction in oil recovery by asphaltene deposition, the oil recovery by higher pressure is still higher; thus, a higher huff pressure is preferred; similarly, although a lower pressure causes higher reduction in oil recovery by asphaltene deposition, the oil recovery by lower puff pressure is still higher; thus, a lower puff pressure is preferred. In summary, the simulation results show that the optimized principles proposed by Sheng (Petroleum 3:431–437, 2017) in the huff-n-puff CO\(_2\) injection are not changed by including asphaltene deposition. In the simulated reservoir case, the huff time and puff time should be 100 days and 200 days, respectively.

Keywords

CO\(_2\) huff-n-puff injection Enhanced oil recovery Shale oil Asphaltene deposition Permeability reduction Reservoir simulation 

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Notes

Acknowledgements

The work presented in this paper is supported by the Department of Energy under Award Number DE-FE0024311.

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Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Department of Petroleum EngineeringTexas Tech UniversityLubbockUSA
  2. 2.SINOPEC Research Institute of Petroleum EngineeringBeijingChina

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