Alternatives of Gas Injection as an Enhanced Recovery Method in Advanced Gas Market Environment

2002 ◽  
Author(s):  
G. Palasthy ◽  
P. Kristof ◽  
T. Toth
Keyword(s):  
Enhanced Recovery ◽  
Gas Injection ◽  
Market Environment ◽  
Recovery Method ◽  
Gas Market

scholarly journals Investigation of Oil Recovery in Fractured Carbonate Rock by

2016 ◽  
Vol 6 (1) ◽  
pp. 14
Author(s):  
H. Karimaie ◽  
O. Torsæter
Keyword(s):  
Oil Recovery ◽  
Gas Injection ◽  
Water Injection ◽  
Co2 Injection ◽  
Recovery Method ◽  
Asmari Limestone ◽  
Fractured Carbonate ◽  
Efficient Recovery ◽  
Live Oil ◽  
Non Equilibrium

The purpose of the three experiments described in this paper is to investigate the efficiency of secondary andtertiary gas injection in fractured carbonate reservoirs, focusing on the effect of equilibrium gas,re-pressurization and non-equilibrium gas. A weakly water-wet sample from Asmari limestone which is the mainoil producing formation in Iran, was placed vertically in a specially designed core holder surrounded withfracture. The unique feature of the apparatus used in the experiment, is the capability of initializing the samplewith live oil to obtain a homogeneous saturation and create the fracture around it by using a special alloy whichis easily meltable. After initializing the sample, the alloy can be drained from the bottom of the modified coreholder and create the fracture which is filled with live oil and surrounded the sample. Pressure and temperaturewere selected in the experiments to give proper interfacial tensions which have been measured experimentally.Series of secondary and tertiary gas injection were carried out using equilibrium and non-equilibrium gas.Experiments have been performed at different pressures and effect of reduction of interfacial tension werechecked by re-pressurization process. The experiments showed little oil recovery due to water injection whilesignificant amount of oil has been produced due to equilibrium gas injection and re-pressurization. Results alsoreveal that CO2 injection is a very efficient recovery method while injection of C1 can also improve the oilrecovery.

Decision analysis supports the use of drain amylase-based enhanced recovery method after esophagectomy

2018 ◽  
Vol 31 (10) ◽  
Author(s):  
B Jiang ◽  
V P Ho ◽  
J Ginsberg ◽  
S J Fu ◽  
Y Perry ◽  
...  
Keyword(s):  
Decision Analysis ◽  
Enhanced Recovery ◽  
Recovery Method ◽  
Drain Amylase

Risk Assessment and Enhanced Oil Recovery Effect of Gravity Assisted Oxygen-Reduced Air Flooding

2021 ◽  
Author(s):  
Lijuan Huang ◽  
Zongfa Li ◽  
Shaoran Ren ◽  
Yanming Liu
Keyword(s):  
Natural Gas ◽  
Oil Recovery ◽  
Gas Injection ◽  
Oil Production ◽  
Air Injection ◽  
Oil Reservoirs ◽  
Displacement Efficiency ◽  
Risk Area ◽  
Recovery Method ◽  
High Risk Area

Abstract The technology of air injection has been widely used in the second and tertiary recovery in oilfields. However, due to the injected air and natural gas will explode, the safety of the gas injection technology has attracted much attention. Gravity assisted oxygen-reduced air flooding is a new method that eliminates explosion risks and improves oil recovery in large-dip oil reservoirs or thick oil layers. The explosion limit data of different components of natural gas under high pressure were obtained through explosion experiments, which verified the suppression effect of oxygen-reduced air on explosions. The influence of natural gas composition and concentration on explosion limits was also investigated. In addition, a rotatable displacement device was used to study the feasibility of gravity assisted oxygen-reduced air injection for improving the heavy oil reservoirs recovery. Under pressure and temperature conditions of 20MPa and 371K, the sand-filled gravity flooding experiments with different dip angles were carried out using oxygen-reduced air with an oxygen content of 8%. The results show that with the increase of the reservoir dip, the pore volume of the injected fluid at the gas channeling point, the efficient development time of gas injection, and the final displacement efficiency of gas injection development all increase through gravity stabilization caused by gravity differentiation. In the presence of a dip angle, the cumulative oil production before the gas breakthrough point exceeded 80% of the oil production during the entire production process, indicating that gravity assisted oxygen-reduced air flooding is an effective and safe improving oil recovery method. Finally, the explosion risk of each link of the air injection process is analyzed, and the high-risk area and the low-risk area are determined.

scholarly journals The Fast Potential Evaluation Method of Enhanced Oil Recovery Based on Statistical Analysis

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 795
Author(s):  
Zhengbo Wang ◽  
Qiang Wang ◽  
Desheng Ma ◽  
Wanchun Zhao ◽  
Xiaohan Feng ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Evaluation Method ◽  
Enhanced Recovery ◽  
Chemical Flooding ◽  
Recovery Method ◽  
Steam Flooding ◽  
Tertiary Oil Recovery ◽  
Similarity Ratio ◽  
Potential Evaluation ◽  
Target Block

Based on a large number of empirical statistics of tertiary oil recovery technology in China, including polymer flooding, chemical flooding, gas flooding, in situ combustion, steam flooding, ect., 22 key reservoir parameters were filterized. Five levels of quantitative screening criteria were developed for different tertiary oil recovery methods. The mean algorithm for the downward approximation and the grey correlation theory were used in this paper to quickly select the appropriate tertiary oil recovery method for the target blocks, which provides a preferred development method for subsequent potential evaluation. In the rapid analogy evaluation method of tertiary oil recovery potential, the total similarity ratio between the target block and the example block is determined. The target block is matched with the appropriate instance block according to the total similarity ratio value, using 80% as the boundary. The ratio of the geological reserves is used to predict the oil recovery interval, the actual annual injection data, and the economic profit, thus quickly predicting the economic potential of the tertiary oil recovery technology in the target block. Currently, our research team has integrated these two methods into the tertiary oil production potential evaluation software EORSYS3.0. The empirical analysis shows that this method is reasonable and the conclusion is reliable. In addition, the actual enhanced recovery value is within the effective range predicted by the method. The method and results of this paper will provide an important decision-making reference for the application and sustainable development of China Petroleum’s main tertiary oil recovery technology in the next 5–10 years.

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

Enhanced Recovery From Naturally Fractured Gas Reservoirs With Seismic Vibrations

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Khadijeh Zare ◽  
Hojjat Mahiyar ◽  
Mojtaba Ghaedi
Keyword(s):  
Seismic Waves ◽  
Enhanced Recovery ◽  
Low Cost ◽  
Rock Properties ◽  
Recovery Method ◽  
Gas Recovery ◽  
Naturally Fractured ◽  
The Matrix ◽  
Seismic Vibrations ◽  
Trapped Gas

Abstract Water level rising in fracture networks of a naturally fractured gas reservoir is extremely challenging and can significantly decrease the ultimate recovery due to reservoir heterogeneity. Although capillary drainage and gravity force can enhance the displacement of gas recovery from matrix to fracture, these forces may not be so effective in mobilizing a large amount of trapped gas through the matrix. So called, the use of seismic wave can be suggested as a low cost and environmentally friendly enhanced method compared with the other conventional enhanced methods. This article is aimed to examine the ability of seismic vibration in generating an efficient driving force for moving the remaining gas into the fracture which, to the best of the author’s knowledge, has not been reported so far. To this end, an in-house numerical simulator has been developed to investigate this enhanced recovery method and also to evaluate the effect of wave characteristics as well as rock properties on the ultimate recovery. The governing equations are solved numerically using finite difference approach and the accuracy of these equations was compared with a commercial simulator for verification. The results are very encouraging and show substantial gas recovery enhancement by applying seismic waves. Our investigation also shows that this stimulation method is more efficient at lower frequencies and also in higher permeable matrix and fractures.

Condensate Recovery from Tight Gas-Condensate Reservoirs using a new Method Based on a Gas-Based Chemical

2021 ◽  
Author(s):  
Abdulelah Nasieef ◽  
Mahmoud Jamiolahmady ◽  
Hosein Doryanidaryuni ◽  
Alejandro Restrepo ◽  
Alonso Ocampo ◽  
...  
Keyword(s):  
Enhanced Recovery ◽  
Gas Condensate ◽  
Dew Point ◽  
New Method ◽  
Reservoir Rock ◽  
Production Data ◽  
Low Permeability ◽  
Recovery Method ◽  
Gas Condensate Reservoirs ◽  
Hydrocarbon Gas

Abstract Recovery from gas condensate reservoirs, when the pressure is below dew point pressure (Pdew), is adversely affected by the accumulation of condensate in the near wellbore region. The mitigation of the near-well bore condensate banking is the main purpose of any enhanced recovery method implemented in gas condensate reservoirs. In this work, a new method was tested to improve condensate recovery by using a chemical that was delivered using hydrocarbon gas as a carrier into a very low permeability and very low porosity reservoir rock. Chemicals are typically injected using liquid carrier solvents. The use of hydrocarbon gas as the carrier provides a remedy to mitigate condensate banking in very low permeability cores by minimizing complications associated with low injectivity and back flow clean-up process requirements of an injected liquid. The chemical potential was evaluated by recording production data from unsteady-state coreflood experiments. The injection of the chemical with equilibrated gas resulted in condensate saturation to decrease from 19.6% to 6.5%. This decrease was not instantaneous and took some time to occur indicating that the chemical needs time to interact with the resident fluid and rock. The benefit of the method, at the field scale, was also estimated by performing single-well numerical simulations that use relative permeability (kr) data which history matched the measured coreflood production data. The results of these preliminary simulations also showed improved recovery of gas and condensate compared to pure depletion, without chemical, by around 40% for the cases considered.

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