Study of surfactant alternating gas injection (SAG) in gas-flooded oil-wet, low permeability carbonate rocks

Fuel ◽  
2019 ◽  
Vol 251 ◽  
pp. 260-275 ◽  
Author(s):  
Pinaki Ghosh ◽  
Kishore K. Mohanty
Keyword(s):  
Carbonate Rocks ◽  
Gas Injection ◽  
Low Permeability

The Mechanism of Flue Gas Injection for Enhanced Light Oil Recovery

2004 ◽  
Vol 126 (2) ◽  
pp. 119-124 ◽  
Author(s):  
O. S. Shokoya ◽  
S. A. (Raj) Mehta ◽  
R. G. Moore ◽  
B. B. Maini ◽  
M. Pooladi-Darvish ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Flue Gas ◽  
Gas Injection ◽  
Cost Effective ◽  
Air Injection ◽  
Oil Reservoirs ◽  
Flue Gases ◽  
Low Permeability ◽  
Light Oil ◽  
Light Oil Reservoirs

Flue gas injection into light oil reservoirs could be a cost-effective gas displacement method for enhanced oil recovery, especially in low porosity and low permeability reservoirs. The flue gas could be generated in situ as obtained from the spontaneous ignition of oil when air is injected into a high temperature reservoir, or injected directly into the reservoir from some surface source. When operating at high pressures commonly found in deep light oil reservoirs, the flue gas may become miscible or near–miscible with the reservoir oil, thereby displacing it more efficiently than an immiscible gas flood. Some successful high pressure air injection (HPAI) projects have been reported in low permeability and low porosity light oil reservoirs. Spontaneous oil ignition was reported in some of these projects, at least from laboratory experiments; however, the mechanism by which the generated flue gas displaces the oil has not been discussed in clear terms in the literature. An experimental investigation was carried out to study the mechanism by which flue gases displace light oil at a reservoir temperature of 116°C and typical reservoir pressures ranging from 27.63 MPa to 46.06 MPa. The results showed that the flue gases displaced the oil in a forward contacting process resembling a combined vaporizing and condensing multi-contact gas drive mechanism. The flue gases also became near-miscible with the oil at elevated pressures, an indication that high pressure flue gas (or air) injection is a cost-effective process for enhanced recovery of light oils, compared to rich gas or water injection, with the potential of sequestering carbon dioxide, a greenhouse gas.

Chemical Flooding in Low Permeability Carbonate Rocks

2017 ◽  
Author(s):  
Pinaki Ghosh ◽  
Himanshu Sharma ◽  
Kishore K. Mohanty
Keyword(s):  
Carbonate Rocks ◽  
Low Permeability ◽  
Chemical Flooding

Feasibility study of gas injection in low permeability reservoirs of Changqing oilfield

Fuel ◽  
2020 ◽  
Vol 274 ◽  
pp. 117831 ◽  
Author(s):  
Ye Tian ◽  
Ozan Uzun ◽  
Yizi Shen ◽  
Zhengdong Lei ◽  
Jiangru Yuan ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Gas Injection ◽  
Low Permeability ◽  
Low Permeability Reservoirs

scholarly journals Evaluation of Cyclic Gas Injection in Enhanced Recovery from Unconventional Light Oil Reservoirs: Effect of Gas Type and Fracture Spacing

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1370 ◽  
Author(s):  
Assef ◽  
Almao
Keyword(s):  
Hydraulic Fracturing ◽  
Enhanced Recovery ◽  
Gas Injection ◽  
Oil Reservoirs ◽  
Low Permeability ◽  
Fracture Spacing ◽  
Light Oil ◽  
Light Oil Reservoirs

ultra-low permeability; hydraulic fracturing; cyclical gas injection; fracking stages

Experimental Study of Hot Water Injection into Low-Permeability Carbonate Rocks

2008 ◽  
Vol 22 (4) ◽  
pp. 2353-2361 ◽  
Author(s):  
Behnam Sedaee Sola ◽  
Fariborz Rashidi
Keyword(s):  
Experimental Study ◽  
Carbonate Rocks ◽  
Water Injection ◽  
Hot Water ◽  
Low Permeability

scholarly journals Experimental Study on Gas Breakthrough Prevention by Flue Gas Drive

2020 ◽  
Vol 218 ◽  
pp. 02022
Author(s):  
Ping Guo ◽  
Shiyong Hu ◽  
Yisheng Hu ◽  
Qijian Ding
Keyword(s):  
Flue Gas ◽  
Gas Injection ◽  
Low Permeability ◽  
High Permeability ◽  
Sweep Efficiency ◽  
Water Alternating Gas ◽  
Vertical Heterogeneity ◽  
Profile Control ◽  
Gas Flooding ◽  
Gas Drive

The heterogeneity of glutenite reservoir is serious, and breakthrough is easy to occur in the process of water drive and gas drive, which reduces the sweep efficiency. The serious vertical heterogeneity in the H well area of Xinjiang oilfield led to the rapid gas breakthrough during gas injection test. Water alternating gas flooding and foam profile control are often used to seal breakthrough. In this paper, based on the actual reservoir characteristics, vertical heterogeneous planar model is made for flooding experiment. The experimental results show that after gas breakthrough caused by water alternating gas flooding, the flue gas foam can effectively block the high permeability layer and develop the low permeability layer, improve the sweep efficiency and recovery percent, and provide reference for the development adjustment of actual reservoir after gas breakthrough.

scholarly journals The efficiency of gas injection into low-permeability multilayer hydrocarbon reservoirs

2021 ◽  
Vol 3 (10) ◽  
pp. 100-108
Author(s):  
Sudad H AL-Obaidi ◽  
Miel Hofmann ◽  
Falah H. Khalaf ◽  
Hiba H. Alwan
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Gas Injection ◽  
Oil Production ◽  
Recovery Factor ◽  
Low Permeability ◽  
Compositional Model ◽  
Multistage Hydraulic Fracturing ◽  
Low Permeability Reservoirs ◽  
Working Agent

The efficiency of gas injection for developing terrigenous deposits within a multilayer producing object is investigated in this article. According to the results of measurements of the 3D hydrodynamic compositional model, an assessment of the oil recovery factor was made. In the studied conditions, re-injection of the associated gas was found to be the most technologically efficient working agent. The factors contributing to the inefficacy of traditional methods of stimulating oil production such as multistage hydraulic fracturing when used to develop low-permeability reservoirs have been analyzed. The factors contributing to the inefficiency of traditional oil-production stimulation methods, such as multistage hydraulic fracturing, have been analysed when they are applied to low-permeability reservoirs. The use of a gas of various compositions is found to be more effective as a working agent for reservoirs with permeability less than 0.005 µm2. Ultimately, the selection of an agent for injection into the reservoir should be driven by the criteria that allow assessing the applicability of the method under specific geological and physical conditions. In multilayer production objects, gas injection efficiency is influenced by a number of factors, in addition to displacement, including the ratio of gas volumes, the degree to which pressure is maintained in each reservoir, as well as how the well is operated. With the increase in production rate from 60 to 90 m3 / day during the re-injection of produced hydrocarbon gas, this study found that the oil recovery factor increased from 0.190 to 0.229. The further increase in flow rate to 150 m3 / day, however, led to a faster gas breakthrough, a decrease in the amount of oil produced, and a decrease in the oil recovery factor to 0.19 Based on the results of the research, methods for stimulating the formation of low-permeability reservoirs were ranked based on their efficacy.

Study on Flow Mechanism of Gas Injection in Porous Carbonate Core

2014 ◽  
Vol 941-944 ◽  
pp. 1453-1458 ◽  
Author(s):  
Hui Liu ◽  
Peng Qu ◽  
Yang Liu
Keyword(s):  
Gas Injection ◽  
Formation Condition ◽  
Low Permeability ◽  
Flow Mechanism ◽  
Associated Gas ◽  
Study Results ◽  
The World ◽  
Gas Flooding ◽  
Hydrocarbon Gas ◽  
Wide Scale

There are wide scale of porous carbonate reservoirs in around the world, that have low permeability with undeveloped fracture. With study target of Savark formation in Middle East, core gas flooding experiments are conducted and microscope seepage mechanism is researched further. The study results indicate, with formation condition, miscible associated gas flooding is not achieved easily because of high minimum miscible pressure; flooding efficiency of hydrocarbon gas injection is high, especially for miscible flooding, because gas flooding makes oil volume expanse and viscosity decrease, and then oil mobility will be improved. In the experiments, gas injection mainly displace mobile oil in macropore, so changing displacement manner should be considered to improve flooding efficiency further.

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