Laboratory Evaluation of Gas-Injection EOR for the Heavy-Oil Reservoirs in Suriname

2014 ◽  
Author(s):  
Karuna Bhoendie ◽  
Kathleen Priscilla Moe Soe Let ◽  
Tianqi Li ◽  
Pacelli L.J. Zitha
Keyword(s):  
Heavy Oil ◽  
Gas Injection ◽  
Oil Reservoirs ◽  
Laboratory Evaluation ◽  
Heavy Oil Reservoirs

scholarly journals Huff-n-Puff Experimental Studies of CO2 with Heavy Oil

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4308 ◽  
Author(s):  
Evgeny Shilov ◽  
Alexey Cheremisin ◽  
Kirill Maksakov ◽  
Sergey Kharlanov
Keyword(s):  
Oil Recovery ◽  
Heavy Oil ◽  
Gas Injection ◽  
Experimental Studies ◽  
Injection Pressure ◽  
Critical Factor ◽  
Oil Reservoirs ◽  
Injection Process ◽  
Heavy Oil Reservoirs ◽  
Oil Flow

This work is devoted to CO2 Huff-n-Puff studies on heavy oil. Oil recovery for heavy oil reservoirs is sufficiently small in comparison with conventional reservoirs, and, due to the physical limitation of oil flow through porous media, a strong need for better understanding of tertiary recovery mechanisms of heavy oil exists. Notwithstanding that the idea of Huff-n-Puff gas injection technology for enhanced oil recovery has existed for dozens of years, there is still no any precise methodology for evaluating the applicability and efficiency of this technology in heavy oil reservoirs. Oil recovery factor is a question of vital importance for heavy oil reservoirs. In this work, we repeated Huff-n-Puff tests more than three times at five distinct pressure points to evaluate the applicability and efficiency of CO2 Huff-n-Puff injection to the heavy oil reservoirs. Additionally, the most critical factor that affects oil recovery in gas injection operation is the condition of miscibility. Experimental data allowed to distinguish the mixing zone of the light fractions of studied heavy oil samples. The experimental results showed that the pressure increase in the Huff-n-Puff injection process does not affect the oil recovery when the injection pressure stays between miscibility pressure of light components of oil and minimum miscibility pressure. It was detected that permeability decreases after Huff-n-Puff CO2 tests.

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