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Open AccessArticle

Performance Evaluation of an Anti Gas-Channeling System (Asphalt-Rigid Particle-Xanthan Gum) Applied in High-Temperature and High-Salinity Fractured Reservoir

by Nanjun Lai 1,2,3,4,*, Yiping Wen 1, Xiaohu Wen 1, Wei He 1, Xiaosha Lin 1, Chao Jia 1 and Dong Hu 1
1
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
2
State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China
3
State Key Laboratory of Oil and Gas Geology and Exploitation of Chengdu University of Technology, Chengdu 610500, China
4
Key Laboratory of Oilfield Chemistry, PetroChina, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(24), 4766; https://doi.org/10.3390/en12244766
Received: 15 November 2019 / Revised: 10 December 2019 / Accepted: 11 December 2019 / Published: 13 December 2019
(This article belongs to the Special Issue Enhanced Oil Recovery 2020)
Asphalt and rigid particles have been chosen as the main blocking agent for solving the anti gas-channeling in high-temperature and high-salinity reservoirs. Particle size range and the concentration of suspending agent were firstly determined, and the influence factors on bonding effect between two materials in the high-temperature environment were then studied. An orthogonal experiment involving three factors (the content of rigid particles and asphalt, and softening point) and four levels was designed to investigate the impact order of the three factors on anti gas-channeling performance, and the optimization scheme has been identified. Results showed that the importance sequence of the factors was C rigid particles > C asphalt > softening point. By verifying the optimization scheme, the plugging ratio of this agent can reach more than 86.24% for 2 mm fractured core in high-temperature and high-salinity environments. The system was evenly distributed in the internal fractures, occupied the fractures completely, and had a certain height of accumulation. The micromorphology observations of the optimal scheme showed that the softened asphalt demonstrated its ‘amoeba’ characteristic and bonded with the surrounding rigid particles. The asphalt filled in the pore which was formed by bridging rigid particles to guarantee the blocking layer did not collapse or was carried by high-pressure N2-flow. This approach can potentially solve gas-channeling problems in reservoirs with serious environments. View Full-Text
Keywords: high-temperature and high-salinity; gas channeling; asphalt; rigid particles; orthogonal experiment; anti gas-channeling system high-temperature and high-salinity; gas channeling; asphalt; rigid particles; orthogonal experiment; anti gas-channeling system
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MDPI and ACS Style

Lai, N.; Wen, Y.; Wen, X.; He, W.; Lin, X.; Jia, C.; Hu, D. Performance Evaluation of an Anti Gas-Channeling System (Asphalt-Rigid Particle-Xanthan Gum) Applied in High-Temperature and High-Salinity Fractured Reservoir. Energies 2019, 12, 4766.

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