The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Cem Sarica - One of the best experts on this subject based on the ideXlab platform.
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a critical review of controlling Paraffin Deposition in production lines using chemicals
Energy & Fuels, 2019Co-Authors: Jinghao Yang, Cem Sarica, Nagu DaraboinaAbstract:Wax Deposition in oil and gas pipelines is considered one of the most severe operational problems, and significant efforts have been made to prevent and remediate this flow assurance issue. Chemica...
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review of Paraffin Deposition research under multiphase flow conditions
Energy & Fuels, 2012Co-Authors: Cem Sarica, Ekarit PanacharoensawadAbstract:Paraffin Deposition in subsea pipelines is one of the flow assurance problems for oil and gas production. A reliable Paraffin Deposition prediction tool is needed to develop mitigation strategies. Most of the studies address single-phase Paraffin Deposition. However, in practice, multiphase flow is a common occurrence during oil and gas production. Paraffin Deposition prediction under multiphase flowing conditions is largely ignored. The current practice is to use single-phase Paraffin Deposition models in conjunction with multiphase flow hydrodynamic and thermal models. Thermal models used mostly do not consider the flow pattern effects rigorously. The use of a single-phase Paraffin Deposition model for multiphase flow is not proper and may lead to significant uncertainty in predictions. Thus, there is a need to better understand Paraffin Deposition under multiphase flow conditions. A limited number of research studies has been conducted. This paper reviews the current state-of-the-art in multiphase para...
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improvements in single phase Paraffin Deposition modeling
Spe Production & Facilities, 2004Co-Authors: O C Hernandez, J.p. Brill, Michael Volk, Cem Sarica, H Hensley, Emmanuel DellecaseAbstract:Paraffin Deposition under single-phase flow conditions was investigated to determine its dependence on shear stripping, deposit aging, flow regime, temperature gradient, and fluid properties. In this study, a new model for the prediction of single-phase wax Deposition has been developed. Most of the models previously used assume that equilibrium exists at the deposit-fluid interface. A kinetic resistance of the fluid is considered in the new model. Therefore, the interfacial-wax concentration might be different from the equilibrium-wax concentration. The model also includes continuous diffusion of wax into the deposit. We believe that this enrichment of the deposit is responsible for the increasing hardness of the deposit with time—a process known as “aging.” The effect of shear stripping may also be incorporated in the prediction. The model predictions are compared with predictions from previous models, as well as with experimental data gathered at the Tulsa U. Paraffin Deposition Projects, with two different oils: a black oil and a condensate. Even though some tuning is required for each type of oil, the new model is based on physical phenomena, reducing the empiricism of previous models.
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tulsa university Paraffin Deposition projects
Other Information: PBD: 1 Jun 2004, 2004Co-Authors: Cem Sarica, Michael VolkAbstract:As oil and gas production moves to deeper and colder water, subsea multiphase production systems become critical for economic feasibility. It will also become increasingly imperative to adequately identify the conditions for Paraffin precipitation and predict Paraffin Deposition rates to optimize the design and operation of these multi-phase production systems. Although several oil companies have Paraffin Deposition predictive capabilities for single-phase oil flow, these predictive capabilities are not suitable for the multiphase flow conditions encountered in most flowlines and wellbores. For deepwater applications in the Gulf of Mexico, it is likely that multiphase production streams consisting of crude oil, produced water and gas will be transported in a single multiphase pipeline to minimize capital cost and complexity at the mudline. Existing single-phase (crude oil) Paraffin Deposition predictive tools are clearly inadequate to accurately design these pipelines, because they do not account for the second and third phases, namely, produced water and gas. The objective of this program is to utilize the current test facilities at The University of Tulsa, as well as member company expertise, to accomplish the following: enhance our understanding of Paraffin Deposition in single and two-phase (gas-oil) flows; conduct focused experiments to better understand various aspects of Deposition physics; and, utilize knowledge gained from experimental modeling studies to enhance the computer programs developed in the previous JIP for predicting Paraffin Deposition in single and two-phase flow environments. These refined computer models will then be tested against field data from member company pipelines.
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TULSA UNIVERSITY Paraffin Deposition PROJECTS
2003Co-Authors: Michael Volk, Cem SaricaAbstract:As oil and gas production moves to deeper and colder water, subsea multiphase production systems become critical for economic feasibility. It will also become increasingly imperative to adequately identify the conditions for Paraffin precipitation and predict Paraffin Deposition rates to optimize the design and operation of these multiphase production systems. Although several oil companies have Paraffin Deposition predictive capabilities for single-phase oil flow, these predictive capabilities are not suitable for the multiphase flow conditions encountered in most flowlines and wellbores. For deepwater applications in the Gulf of Mexico, it is likely that multiphase production streams consisting of crude oil, produced water and gas will be transported in a single multiphase pipeline to minimize capital cost and complexity at the mudline. Existing single-phase (crude oil) Paraffin Deposition predictive tools are clearly inadequate to accurately design these pipelines because they do not account for the second and third phases, namely, produced water and gas. The objective of this program is to utilize the current test facilities at The University of Tulsa, as well as member company expertise, to accomplish the following: enhance our understanding of Paraffin Deposition in single and two-phase (gas-oil) flows; conduct focused experiments to better understand various aspects ofmore » Deposition physics; and, utilize knowledge gained from experimental modeling studies to enhance the computer programs developed in the previous JIP for predicting Paraffin Deposition in single and two-phase flow environments. These refined computer models will then be tested against field data from member company pipelines. The following deliverables are scheduled during the first three projects of the program: (1) Single-Phase Studies, with three different black oils, which will yield an enhanced computer code for predicting Paraffin Deposition in deepwater and surface pipelines. (2) Two-Phase Studies, with a focus on heat transfer and Paraffin Deposition at various pipe inclinations, which will be used to enhance the Paraffin Deposition code for gas-liquid flow in pipes. (3) Deposition Physics and Water Impact Studies, which will address the aging process, improve our ability to characterize Paraffin deposits and enhance our understanding of the role water plays in Paraffin Deposition in deepwater pipelines. As in the previous two studies, knowledge gained in this suite of studies will be integrated into a state-of-the-art three-phase Paraffin Deposition computer program.« less
Michael Volk - One of the best experts on this subject based on the ideXlab platform.
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improvements in single phase Paraffin Deposition modeling
Spe Production & Facilities, 2004Co-Authors: O C Hernandez, J.p. Brill, Michael Volk, Cem Sarica, H Hensley, Emmanuel DellecaseAbstract:Paraffin Deposition under single-phase flow conditions was investigated to determine its dependence on shear stripping, deposit aging, flow regime, temperature gradient, and fluid properties. In this study, a new model for the prediction of single-phase wax Deposition has been developed. Most of the models previously used assume that equilibrium exists at the deposit-fluid interface. A kinetic resistance of the fluid is considered in the new model. Therefore, the interfacial-wax concentration might be different from the equilibrium-wax concentration. The model also includes continuous diffusion of wax into the deposit. We believe that this enrichment of the deposit is responsible for the increasing hardness of the deposit with time—a process known as “aging.” The effect of shear stripping may also be incorporated in the prediction. The model predictions are compared with predictions from previous models, as well as with experimental data gathered at the Tulsa U. Paraffin Deposition Projects, with two different oils: a black oil and a condensate. Even though some tuning is required for each type of oil, the new model is based on physical phenomena, reducing the empiricism of previous models.
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tulsa university Paraffin Deposition projects
Other Information: PBD: 1 Jun 2004, 2004Co-Authors: Cem Sarica, Michael VolkAbstract:As oil and gas production moves to deeper and colder water, subsea multiphase production systems become critical for economic feasibility. It will also become increasingly imperative to adequately identify the conditions for Paraffin precipitation and predict Paraffin Deposition rates to optimize the design and operation of these multi-phase production systems. Although several oil companies have Paraffin Deposition predictive capabilities for single-phase oil flow, these predictive capabilities are not suitable for the multiphase flow conditions encountered in most flowlines and wellbores. For deepwater applications in the Gulf of Mexico, it is likely that multiphase production streams consisting of crude oil, produced water and gas will be transported in a single multiphase pipeline to minimize capital cost and complexity at the mudline. Existing single-phase (crude oil) Paraffin Deposition predictive tools are clearly inadequate to accurately design these pipelines, because they do not account for the second and third phases, namely, produced water and gas. The objective of this program is to utilize the current test facilities at The University of Tulsa, as well as member company expertise, to accomplish the following: enhance our understanding of Paraffin Deposition in single and two-phase (gas-oil) flows; conduct focused experiments to better understand various aspects of Deposition physics; and, utilize knowledge gained from experimental modeling studies to enhance the computer programs developed in the previous JIP for predicting Paraffin Deposition in single and two-phase flow environments. These refined computer models will then be tested against field data from member company pipelines.
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TULSA UNIVERSITY Paraffin Deposition PROJECTS
2003Co-Authors: Michael Volk, Cem SaricaAbstract:As oil and gas production moves to deeper and colder water, subsea multiphase production systems become critical for economic feasibility. It will also become increasingly imperative to adequately identify the conditions for Paraffin precipitation and predict Paraffin Deposition rates to optimize the design and operation of these multiphase production systems. Although several oil companies have Paraffin Deposition predictive capabilities for single-phase oil flow, these predictive capabilities are not suitable for the multiphase flow conditions encountered in most flowlines and wellbores. For deepwater applications in the Gulf of Mexico, it is likely that multiphase production streams consisting of crude oil, produced water and gas will be transported in a single multiphase pipeline to minimize capital cost and complexity at the mudline. Existing single-phase (crude oil) Paraffin Deposition predictive tools are clearly inadequate to accurately design these pipelines because they do not account for the second and third phases, namely, produced water and gas. The objective of this program is to utilize the current test facilities at The University of Tulsa, as well as member company expertise, to accomplish the following: enhance our understanding of Paraffin Deposition in single and two-phase (gas-oil) flows; conduct focused experiments to better understand various aspects ofmore » Deposition physics; and, utilize knowledge gained from experimental modeling studies to enhance the computer programs developed in the previous JIP for predicting Paraffin Deposition in single and two-phase flow environments. These refined computer models will then be tested against field data from member company pipelines. The following deliverables are scheduled during the first three projects of the program: (1) Single-Phase Studies, with three different black oils, which will yield an enhanced computer code for predicting Paraffin Deposition in deepwater and surface pipelines. (2) Two-Phase Studies, with a focus on heat transfer and Paraffin Deposition at various pipe inclinations, which will be used to enhance the Paraffin Deposition code for gas-liquid flow in pipes. (3) Deposition Physics and Water Impact Studies, which will address the aging process, improve our ability to characterize Paraffin deposits and enhance our understanding of the role water plays in Paraffin Deposition in deepwater pipelines. As in the previous two studies, knowledge gained in this suite of studies will be integrated into a state-of-the-art three-phase Paraffin Deposition computer program.« less
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Investigation of Paraffin Deposition During Multiphase Flow in Pipelines and Wellbores—Part 1: Experiments
Journal of Energy Resources Technology, 2002Co-Authors: Ahmadbazlee Matzain, Michael Volk, James P. Brill, Mandar S Apte, Hongquan Zhang, Jeff L CreekAbstract:Results are presented from two-phase flow wax Deposition tests using a state-of-the-art, high-pressure, multiphase flow test facility. Wax Deposition was found to be flow pattern specific and dependent on the flow velocities of the two-phase fluids. Wax Deposition occurs only along the pipe wall in contact with a waxy crude oil. An increase in mixture velocity results in harder deposits, but with a lower deposit thickness. The wax buildup trend at low mixture velocities is similar to that observed in laminar single-phase flow tests. The wax buildup trend at high mixture velocities is similar to that observed in turbulent single-phase flow tests. Thinner and harder deposits at the bottom than at the top of the pipe were observed in horizontal and near-horizontal intermittent flow tests. For annular flow tests, thicker and harder deposits were observed at low superficial liquid velocity than at high superficial liquid velocity. In stratified flow tests, no wax Deposition was observed along the upper portion of the pipe.
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investigation of Paraffin Deposition during multiphase flow in pipelines and wellbores part 2 modeling
Journal of Energy Resources Technology-transactions of The Asme, 2001Co-Authors: Mandar S Apte, J.p. Brill, Michael Volk, Ahmadbazlee Matzain, Hongquan Zhang, Jeff L CreekAbstract:Results are presented from two-phase flow wax Deposition tests using a state-of-the-art, high-pressure, multiphase flow test facility. Wax Deposition was found to be flow pattern specific and dependent on the flow velocities of the two-phase fluids. Wax Deposition occurs only along the pipe wall in contact with a waxy crude oil. An increase in mixture velocity results in harder deposits, but with a lower deposit thickness. The wax buildup trend at low mixture velocities is similar to that observed in laminar single-phase flow tests. The wax buildup trend at high mixture velocities is similar to that observed in turbulent single-phase flow tests. Thinner and harder deposits at the bottom than at the top of the pipe were observed in horizontal and near-horizontal intermittent flow tests. For annular flow tests, thicker and harder deposits were observed at low superficial liquid velocity than at high superficial liquid velocity. In stratified flow tests, no wax Deposition was observed along the upper portion of the pipe.
Zhenjun Wang - One of the best experts on this subject based on the ideXlab platform.
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research on ultrasonic Paraffin Deposition inhibition for crude oil extraction and transportation
Petroleum Science and Technology, 2019Co-Authors: Jingkui Li, Dawei Qi, Zhenjun WangAbstract:AbstractMost of the oil produced from oil fields is Paraffin-contained crude oil. Ultrasonic treatment has been proven to be good method for Paraffin inhibition. In this article, it is proved, from the microscopic point of view, that ultrasonic wave can change the morphology of Paraffin crystal, inhibit the growth of Paraffin crystal and disperse the crystalline particles; it also confirms that ultrasonic wave can break the carbon chain structure of the Paraffin molecules, which provides strong evidence for the study of the mechanism of ultrasonic Paraffin Deposition inhibition and viscosity reduction.
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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, Jing Zeng, Hao Song, 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.
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The comparison of removing plug by ultrasonic wave, chemical deplugging agent and ultrasound–chemical combination deplugging for near-well ultrasonic processing technology
Ultrasonics Sonochemistry, 2015Co-Authors: Zhenjun Wang, Yuanming Xu, Suman BajracharyaAbstract:Abstract Near-well ultrasonic processing technology is characterized by high adaptability, simple operation, low cost and zero pollution. The main plugs of oil production include Paraffin Deposition plug, polymer plug, and drilling fluid plug etc. Although some good results have been obtained through laboratory experiments and field tests, systematic and intensive studies are absent for certain major aspects, such as: effects of ultrasonic treatment for different kinds of plugs and whether effect of ultrasound–chemicals combination deplugging is better than that of ultrasonic deplugging. In this paper, the experiments of removing drilling fluid plug, Paraffin Deposition plug and polymer plug by ultrasonic wave, chemical deplugging agent and ultrasound–chemical combination deplugging respectively are carried out. Results show that the effect of ultrasound–chemical combination deplugging is clearly better than that of using ultrasonic wave and chemical deplugging agent separately, which indicates that ultrasonic deplugging and chemical deplugging can produce synergetic effects. On the one hand, ultrasonic treatment can boost the activity of chemical deplugging agent and turn chemical deplugging into dynamic chemical process, promoting chemical agent reaction speed and enhancing deplugging effect; on the other hand, chemical agent can reduce the adhesion strength of plugs so that ultrasonic deplugging effect can be improved significantly. Experimental results provide important reference for near-well ultrasonic processing technology.
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, Jing Zeng, Hao Song, 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.
Ekarit Panacharoensawad - One of the best experts on this subject based on the ideXlab platform.
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review of Paraffin Deposition research under multiphase flow conditions
Energy & Fuels, 2012Co-Authors: Cem Sarica, Ekarit PanacharoensawadAbstract:Paraffin Deposition in subsea pipelines is one of the flow assurance problems for oil and gas production. A reliable Paraffin Deposition prediction tool is needed to develop mitigation strategies. Most of the studies address single-phase Paraffin Deposition. However, in practice, multiphase flow is a common occurrence during oil and gas production. Paraffin Deposition prediction under multiphase flowing conditions is largely ignored. The current practice is to use single-phase Paraffin Deposition models in conjunction with multiphase flow hydrodynamic and thermal models. Thermal models used mostly do not consider the flow pattern effects rigorously. The use of a single-phase Paraffin Deposition model for multiphase flow is not proper and may lead to significant uncertainty in predictions. Thus, there is a need to better understand Paraffin Deposition under multiphase flow conditions. A limited number of research studies has been conducted. This paper reviews the current state-of-the-art in multiphase para...
