Experimental evaluation of live oil oxidation together with its physical properties during air injection in a tight oil reservoir

Liu, Guangfeng; Zhang, Tenghuan; Liu, Wantao; Wang, Lianhe; Yang, Daoyong

doi:10.1016/j.fuel.2020.119121

Cited by 23 publications

(10 citation statements)

References 44 publications

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“…When the displacement pressure difference reaches 6 MPa, the gas driving radius is basically stable. Liu et al 218 carried out comparative experiments of air injection and nitrogen injection core flooding in tight reservoirs under temperature and pressure conditions, and evaluated the EOR performance of air injection. The experimental results report that air injection recovery is significantly higher than nitrogen injection recovery.…”

Section: Nanosized Oil Displacement Agentmentioning

confidence: 99%

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Wang

Han

et al. 2023

Energy Fuels

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Despite rapid advances in renewable energy extraction and utilization, global oil demand continues to rise. Oil displacement technologies are widely studied and applied because they can extract more oil in depleted reservoirs or recover unconventional ones. This study introduces research methods and mechanisms of four oil displacement technologies, i.e., water flooding, chemical flooding, gas flooding, and steam flooding. Although oil displacement technologies are helping to meet the growing demand for oil and energy, there are still some challenges for industrial applications. Some agents adopted in the oil displacement have shortcomings in the corrosion of mining equipment and damage to the reservoir structure. Therefore, solutions to the problem are crucial and are investigated widely in the literature using experiments and simulations. For experimental research, a diffusion framework for studying mass transfer in the oil displacement process and an experimental system for simulating oil displacement in offshore reservoirs should be built, which will facilitate the widespread industrial application of oil displacement technology. Therefore, it is necessary to improve the accuracy and expand the application range of the experimental system. As for numerical simulation, reaction kinetics research is essential for selecting displacement agent materials and preventing harmful gas leakage for industrial applications. However, the dynamics of foam flooding and CO2 flooding are not thoroughly studied. Moreover, it is an acceptable research topic that reducing the uncertainty of discrete regions is an effective method to improve the accuracy of numerical simulation results. For the broader application of oil displacement technology to industry, several mechanisms regarding the research field could be studied more thoroughly and comprehensively in the future, i.e., (1) the influence mechanisms of some impurities and complex reservoir physical properties, (2) the method of combining various oil displacement technologies, (3) the T-H-M-C multifield coupling oil displacement mechanism at micro/nanoscale, (4) the cement failure mechanism caused by CO2 and H2S, and (5) the tube brittle fracture mechanism caused by stress corrosion. For the sustainable development and efficient utilization of oil displacement, this review summarizes the extensive information about four oil displacement technologies, thus encouraging and providing research topics for further development and applications.

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Section: Nanosized Oil Displacement Agentmentioning

confidence: 99%

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Wang

Han

et al. 2023

Energy Fuels

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“…The air contains a certain amount of oxygen. After injection, it reacts with the crude oil to produce heat, which promotes the viscosity reduction and expansion of the crude oil. , At the same time, the CO and CO 2 generated from the reaction form flue gas with N 2 , light hydrocarbons, and other components, thus enhancing the oil recovery. , CO 2 flooding can not only enhance oil recovery but also realize the geological storage of CO 2 during oil displacement. The mechanism of CO 2 flooding is extremely complex.…”

Section: Introductionmentioning

confidence: 99%

Study on the Difference in CO₂ and Air Injection in the Fracture/Matrix Dual Medium of Continental Shale Reservoirs

Tan

Qin

et al. 2023

ACS Omega

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To clarify the impact of different displacement media on the enhanced oil recovery of continental shale and realize the efficient and reasonable development of shale reservoirs, this paper takes the continental shale of the Lucaogou Formation in the Jimusar Sag in the Junggar Basin (China, Xinjiang) as the research object and uses real cores to build the fracture/matrix dual-medium model. Computerized tomography (CT) scanning is used to visually compare and analyze the influence of fracture/matrix dual-medium and single-matrix medium seepage systems on oil production characteristics and clarify the difference between air and CO2 in enhancing the oil recovery of continental shale reservoirs. Through a comprehensive analysis of the production parameters, the whole oil displacement process can be divided into three stages: the oil-rich and gas-poor stage, oil and gas coproduction stage, and gas-rich and oil-poor stage. Shale oil production follows the rule of fractures first and matrix second. However, for CO2 injection, after the crude oil in the fractures is recovered, the oil in the matrix migrates to the fractures under the action of CO2 dissolution and extraction. Overall, the oil displacement effect of CO2 is better than that of air, resulting in a 5.42% higher final recovery factor. Additionally, fractures can increase the permeability of the reservoir, which can greatly enhance oil recovery in the early oil displacement process. However, as the amount of injected gas increases, its impact gradually decreases, and ultimately, it is consistent with the recovery of nonfractured shale, which can achieve nearly the same development effect.

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“…simulated the distribution characteristics of fractures and matrix pores after hydraulic fracturing of the reservoir by using a large physical simulation device and nuclear magnetic resonance instrument of a full diameter core with high temperature and pressure . Liu et al performed a thin tube experiment to monitor the miscibility between air and live oil . Rao et al designed a reverse engineering design model to examine the process parameters of water injection huff-n-puff .…”

Section: Introductionmentioning

confidence: 99%

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

Ji,

Yu,

Liu

et al. 2023

Energy Fuels

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It is difficult to establish an effective injection production well pattern in tight reservoirs, and water injection huff-n-puff is an important technology for EOR in late elastic energy development. The water injection huff-n-puff is established with a three-dimensional physical simulation experiment. The boundary conditions are simulated by setting up a pressure buffer device. The injection and production processes of horizontal wells are simulated by prefabricated artificial fractures at the injection port. The variation laws of 29 pressure points and 130 resistivity points can be effectively detected. Two cycles of experiments with different injection volumes are carried out, the change process of pressure and resistivity is analyzed, and the oil production mechanism is described. The fluid transfer velocity along the fracture extension direction is higher than that in the vertical fracture extension direction. The effect of the first cycle of the water injection huff-n-puff is significantly better than that of the second cycle. The change rule of oil recovery and oil change rate with different injection volumes shows that there is an optimal injection volume to maximize the on-site implementation benefits. The experimental results provide a theoretical and experimental basis for EOR by a water injection huff-n-puff in tight reservoirs.

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Experimental evaluation of live oil oxidation together with its physical properties during air injection in a tight oil reservoir

Cited by 23 publications

References 44 publications

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Study on the Difference in CO₂ and Air Injection in the Fracture/Matrix Dual Medium of Continental Shale Reservoirs

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

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Experimental evaluation of live oil oxidation together with its physical properties during air injection in a tight oil reservoir

Cited by 23 publications

References 44 publications

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Review on Oil Displacement Technologies of Enhanced Oil Recovery: State-of-the-Art and Outlook

Study on the Difference in CO2 and Air Injection in the Fracture/Matrix Dual Medium of Continental Shale Reservoirs

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

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Study on the Difference in CO₂ and Air Injection in the Fracture/Matrix Dual Medium of Continental Shale Reservoirs