The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Zhenjun Wang - One of the best experts on this subject based on the ideXlab platform.
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research on removing reservoir core water sensitivity using the method of ultrasound Chemical Agent for enhanced oil recovery
Ultrasonics Sonochemistry, 2018Co-Authors: Zhenjun Wang, Jiehao HuangAbstract:The phenomenon of water sensitivity often occurs in the oil reservoir core during the process of crude oil production, which seriously affects the efficiency of oil extraction. In recent years, near-well ultrasonic processing technology attaches more attention due to its safety and energy efficient. In this paper, the comparison of removing core water sensitivity by ultrasonic wave, Chemical injection and ultrasound-Chemical combination technique are investigated through experiments. Results show that: lower ultrasonic frequency and higher power can improve the efficiency of core water sensitivity removal; the effects of removing core water sensitivity under ultrasonic treatment get better with increase of core initial permeability; the effect of removing core water sensitivity using ultrasonic treatment won't get better over time. Ultrasonic treatment time should be controlled in a reasonable range; the effect of removing core water sensitivity using Chemical Agent alone is slightly better than that using ultrasonic treatment, however, Chemical injection could be replaced by ultrasonic treatment for removing core water sensitivity from the viewpoint of oil reservoir protection and the sustainable development of oil field; ultrasound-Chemical combination technique has the best effect for water sensitivity removal than using ultrasonic treatment or Chemical injection alone.
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research on ultrasonic excitation for the removal of drilling fluid plug paraffin deposition plug polymer plug and inorganic scale plug for near well ultrasonic processing technology
Ultrasonics Sonochemistry, 2017Co-Authors: Zhenjun Wang, Hao Song, Jing Zeng, Feng LiAbstract:Near-well ultrasonic processing technology attracts more attention due to its simple operation, high adaptability, low cost and no pollution to the formation. Although this technology has been investigated in detail through laboratory experiments and field tests, systematic and intensive researches are absent for certain major aspects, such as whether ultrasonic excitation is better than Chemical Agent for any plugs removal; whether ultrasound-Chemical combination plug removal technology has the best plugs removal effect. In this paper, the comparison of removing drilling fluid plug, paraffin deposition plug, polymer plug and inorganic scale plug using ultrasonic excitation, Chemical Agent and ultrasound-Chemical combination plug removal technology is investigated. Results show that the initial core permeability and ultrasonic frequency play a significant role in plug removal. Ultrasonic excitation and Chemical Agent have different impact on different plugs. The comparison results show that the effect of removing any plugs using ultrasound-Chemicals composite plug removal technology is obviously better than that using ultrasonic excitation or Chemical Agent alone. Such conclusion proves that ultrasonic excitation and Chemical Agent can cause synergetic effects.
Feng Li - One of the best experts on this subject based on the ideXlab platform.
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research on ultrasonic excitation for the removal of drilling fluid plug paraffin deposition plug polymer plug and inorganic scale plug for near well ultrasonic processing technology
Ultrasonics Sonochemistry, 2017Co-Authors: Zhenjun Wang, Hao Song, Jing Zeng, Feng LiAbstract:Near-well ultrasonic processing technology attracts more attention due to its simple operation, high adaptability, low cost and no pollution to the formation. Although this technology has been investigated in detail through laboratory experiments and field tests, systematic and intensive researches are absent for certain major aspects, such as whether ultrasonic excitation is better than Chemical Agent for any plugs removal; whether ultrasound-Chemical combination plug removal technology has the best plugs removal effect. In this paper, the comparison of removing drilling fluid plug, paraffin deposition plug, polymer plug and inorganic scale plug using ultrasonic excitation, Chemical Agent and ultrasound-Chemical combination plug removal technology is investigated. Results show that the initial core permeability and ultrasonic frequency play a significant role in plug removal. Ultrasonic excitation and Chemical Agent have different impact on different plugs. The comparison results show that the effect of removing any plugs using ultrasound-Chemicals composite plug removal technology is obviously better than that using ultrasonic excitation or Chemical Agent alone. Such conclusion proves that ultrasonic excitation and Chemical Agent can cause synergetic effects.
V A Kozachyna - One of the best experts on this subject based on the ideXlab platform.
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CALCULATION OF «VULNERABILITY» ZONE IN CASE OF TERRORIST ATTACK WITH Chemical AgentS
Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2018Co-Authors: M. M. Biliaiev, I V Kalashnikov, Oleksandr V. Berlov, V A KozachynaAbstract:Purpose. The work involves the development of a numerical model for calculating the «vulnerability» zone of a possible terrorist attack objective with the use of a Chemical Agent in a built-up environment. The «vulnerability» zone is a territory near the attack objective, where the emission of a Chemical Agent during the attack will lead to undesirable consequences. The emission of a Chemical Agent outside the «vulnerability» zone will not create a dangerous concentration near the attack objective. Methodology. To solve this problem, we use the equation for the velocity potential, on the basis of which we determine the wind stream velocity field, and the equation adjoint to the equation of mass transfer in the atmospheric air of the Chemical Agent emitted in the event of a terrorist attack. During simulation, we take into account the uneven wind stream velocity field, atmospheric diffusion and the rate of emission of a Chemically hazardous substance. For the numerical integration of the velocity potential equation, we use the method of A. A. Samarsky. For numerical solution of the adjoint equation, we introduce new variables and use an implicit difference splitting scheme. The peculiarity of the developed numerical model is the possibility of operative estimation of the «vulnerability» zone near a possible attack objective. Findings . The developed numerical model and computer program can be used for scientifically grounded assessment of the «vulnerability» zone near significant facilities in the event of possible attacks with the use of Chemical (biological) Agents. The constructed numerical model can be implemented on computers of small and medium power, which allows it to be widely used to solve the problems of this class when developing the emergency response plan. The results of the computational experiment are presented, which allow us to evaluate the possibilities of the proposed numerical model. Originality . An effective numerical model is proposed for calculating the «vulnerability» zone near the facility, which may be the target of a terrorist attack with the use of a Chemical Agent. The model is based on the numerical integration of the velocity potential equation and the equation adjoint to the equation of mass transfer of a Chemically dangerous substance in the atmosphere. Practical value. The developed model can be used to organize protective actions near the target facility of a possible Chemical attack by terrorists.
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3d numerical model for territorial risk assesment after terrorist act
Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2018Co-Authors: M. M. Biliaiev, I V Kalashnikov, Ivanovich Vasilij Klimenko, V A KozachynaAbstract:Purpose. A goal of the work is development of 3D numerical model for a territorial risk assessment in a case of a terrorist attack with usage of a Chemical Agent. Methodology. To describe the process of Chemical Agent dispersion in the atmosphere, emitted in a case of a terrorist attack, the equation of mass transfer of an admixture in atmospheric air is used. The equation takes into account a velocity of the wind flow, atmospheric diffusion, an intensity of Chemical Agent emission, a buildings presence near a place of a Chemically hazardous substance release. For numerical integration of the modeling equation, a finite difference method is used. A feature of the developed numerical model is possibility of a territorial risk assessment in a case of a terrorist attack under different weather conditions and a buildings presence. For calculation of wind flow velocity field in a case of building presence 3D equation for potential of velocity is used. Findings . The specialized numerical model and software package which can be used for a territorial risk assessment, both in a case of terrorist attacks with usage of Chemical Agents, and in a case of extreme situations at Chemically hazardous facilities and transport are developed. The method can be implemented on small and medium-powered computers, which allows it to be widely used for solving this class of problems. The results of a computational experiment are presented that allow estimating possibilities of the proposed method for assessing a territorial risk in a case of a terrorist attack with usage of Chemical Agent. Originality. An effective method of a territorial risk assessment in a case of a terrorist attack with usage of a Chemically hazardous substance is proposed. The method can be used to assess a territorial risk in an urban environment, which allows to obtain adequate data about possible affected areas. The method is based on numerical integration of the fundamental mass transfer equation, which expresses the law of conservation of mass in a liquid medium. Practical value. The proposed method for a territorial risk assessment in a case of a terrorist attack with usage of a Chemical Agent can be used to calculate the affected areas near administrative buildings, centers and other socially significant facilities.
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territorial risk assesment after terrorist act express model
Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2018Co-Authors: M. M. Biliaiev, I V Kalashnikov, V A KozachynaAbstract:Purpose. The paper involves the development of a method to assess the territorial risk in the event of a terrorist attack using a Chemical Agent. Methodology. To describe the process of Chemical Agent scattering in the atmosphere, ejected in the event of a terrorist attack, the equation of mass transfer of an impurity in atmospheric air is used. The equation takes into account the velocity of the wind flow, atmospheric diffusion, the intensity of Chemical Agent emission, the presence of buildings near the site of the emission of a Chemically hazardous substance. For numerical integration of the modeling equation, a finite difference method is used. A feature of the developed numerical model is the possibility of assessing the territorial risk in the event of a terrorist attack under different weather conditions and the presence of buildings. Findings. A specialized numerical model and software package has been developed that can be used to assess the territorial risk, both in the case of terrorist attacks, with the use of Chemical Agents, and in case of extreme situations at Chemically hazardous facilities and transport. The method can be implemented on small and medium-sized computers, which allows it to be widely used for solving the problems of the class under consideration. The results of a computational experiment are presented that allow estimating possibilities of the proposed method for assessing the territorial risk in the event of a terrorist attack using a Chemical Agent. Originality. An effective method of assessing the territorial risk in the event of a terrorist attack using a Chemically hazardous substance is proposed. The method can be used to assess the territorial risk in an urban environment, which allows you to obtain adequate data on possible damage areas. The method is based on the numerical integration of the fundamental mass transfer equation, which expresses the law of conservation of mass in a liquid medium. Practical value. The proposed method for assessing the territorial risk in the event of a terrorist attack using a Chemical Agent can be used to calculate the affected areas near administrative buildings, centers and other socially significant facilities.
Jiehao Huang - One of the best experts on this subject based on the ideXlab platform.
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research on removing reservoir core water sensitivity using the method of ultrasound Chemical Agent for enhanced oil recovery
Ultrasonics Sonochemistry, 2018Co-Authors: Zhenjun Wang, Jiehao HuangAbstract:The phenomenon of water sensitivity often occurs in the oil reservoir core during the process of crude oil production, which seriously affects the efficiency of oil extraction. In recent years, near-well ultrasonic processing technology attaches more attention due to its safety and energy efficient. In this paper, the comparison of removing core water sensitivity by ultrasonic wave, Chemical injection and ultrasound-Chemical combination technique are investigated through experiments. Results show that: lower ultrasonic frequency and higher power can improve the efficiency of core water sensitivity removal; the effects of removing core water sensitivity under ultrasonic treatment get better with increase of core initial permeability; the effect of removing core water sensitivity using ultrasonic treatment won't get better over time. Ultrasonic treatment time should be controlled in a reasonable range; the effect of removing core water sensitivity using Chemical Agent alone is slightly better than that using ultrasonic treatment, however, Chemical injection could be replaced by ultrasonic treatment for removing core water sensitivity from the viewpoint of oil reservoir protection and the sustainable development of oil field; ultrasound-Chemical combination technique has the best effect for water sensitivity removal than using ultrasonic treatment or Chemical injection alone.
Tuan Vodinh - One of the best experts on this subject based on the ideXlab platform.
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permeation measurements of Chemical Agent simulants through protective clothing materials
Journal of Hazardous Materials, 1993Co-Authors: T Pal, Guy D Griffin, Gordon H Miller, Annetta P Watson, Mary Lou Daugherty, Tuan VodinhAbstract:Abstract Effective procedures associated with storage and disposal of Chemical warfare (CW) Agents are important for the protection of civilian populations from inadvertent release of these Agents. Emergency groups as well as citizens in surrounding communities need to know the relative effectiveness of various Chemical protective clothing (CPC) ensembles in the unlikely event of such releases. A method has been developed for studying permeation of Chemical warfare Agent simulants through CPC materials. The experimental results characterize some commercially available CPC materials. Thirteen different CPC materials having widely differing compositions were chosen to study the permeation of four different liquid CW simulants (dimethyl methyl phosphonate, diisopropyl methyl phosphonate, malathion, and dibutyl sulfide) through these CPC materials at 25 °C. This permeation study involved a newly developed analytical technique employing room temperature fluorescence quenching of an indicator compound, phenanthrene, on filter paper. Various experimental factors such as breakthrough time, rate of permeation and uptake were investigated. On the basis of breakthrough time, the 13 CPC materials could be divided into three groups: most resistant, moderately resistant, and least resistant. Materials in the most resistant category exhibited no permeation by any of the simulants for at least 24 hours. Breakthrough occurred in the least resistant materials in generally less than an hour, and sometimes as soon as a few minutes.
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development of a fluorescence quenching technique to detect permeation of Chemical Agent simulants through protective clothing materials
Applied Spectroscopy, 1992Co-Authors: Tuan Vodinh, T PalAbstract:This study involves the development of a new and simple analytical procedure based on a spectroChemical modification (SM) technique, namely fluorescence quenching (FQ) to monitor Chemical Agent simulants. The FQ technique is applied to evaluate permeation of these compounds through protective clothing materials.