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Selles Adrien - One of the best experts on this subject based on the ideXlab platform.

  • Cold Water injections as innovative smart tracer technique in hot fractured aquifers
    2019
    Co-Authors: Hoffmann Richard, Wajid Uddin, Goderniaux Pascal, Dassargues Alain, Maréchal Jean-christophe, Chandra Subash, Tiwari, Virendra M., Selles Adrien
    Abstract:

    audience: researcher, professional, student, popularization, otherRobust transport simulations for sustainable management of groundWater in fractured rocks, need accurate observation data about fracture and matrix processes. In aquifers with naturally hot groundWaters (i.e., 30 ºC in South India), heat injections can become difficult and cumbersome, considering strong density influences. Injecting Cold Water is a much more promising and innovative tracer technique. Injecting Cold Water reduces the energy stored in the matrix, as heat is released to the Colder circulating fluid in the fractures. Thus, Cold Water injections can produce very informative reference data for managing hot fractured aquifers using groundWater flow and Cold plume transport numerical modeling. Heat and Cold Water tracer tests have been performed for the first time in Choutuppal nearby Hyderabad in South India. Sub-horizontal fractures have been intersected by 30 wells drilled in a weathered granite aquifer. A saprolite layer of in average 14 m thickness covers the fractured granite system. The natural granite aquifer background temperature varies yearly between 30 ºCand 35 ºC During the experiments, the natural aquifer background temperature was around 30.3 ºC The most explored well (CH03) is used as injection well for all experiments. There, an inflatable double packer system isolates one sub-horizontal fracture connecting CH03 with a pumping well (CH12) located at a 5.5 m distance. This set-up allows successive 1-hour injections of 1000 L of hot Water (ΔT = +20 ºC) and Cold Water (ΔT = -20 ºC). The peak arrival times measured in CH12 are 41 minutes for heat and 51 minutes for Cold Water. The peak temperature difference measured in CH12 for heat is ΔT = +3.3 ºC and for Cold Water ΔT = -2.9 ºC This is consistent with the fact that density and viscosity decrease with higher temperatures. Remarkably, Cold Water shows a slightly faster first arrival. It might indicate that storing energy is slightly faster initiated than releasing energy from the matrix. First interpretations of the observed tailings show that for hot Water injection, the subsequent temperature decrease (back to the background T) seems slower than the observed temperature increase after the Cold Water injection. It seems that cooling the matrix (i.e. reducing the energy level) is slightly more time consuming and difficult than heating the matrix (i.e. storing energy). More experiments, e.g. repetitions of these experiments focusing stronger on the tailing for imaging matrix processes, complementing Cold Water tracing experiments (e.g. push-pull) and the possible parallel use of geophysical imaging tools, are ongoing. Nevertheless, the first tracer tests with Cold Water injections generated reference data that are very informative for further transport modeling (e.g. using Monte Carlo simulations)

  • Cold Water injections as innovative smart tracer technique in hot fractured aquifers
    HAL CCSD, 2019
    Co-Authors: Hoffmann Richard, Goderniaux Pascal, Dassargues Alain, Maréchal Jean-christophe, Chandra Subash, Uddin Wajid, Tiwari Virendra, Selles Adrien
    Abstract:

    International audienceRobust transport simulations for sustainable management of groundWater in fractured rocks, need accurate observation data about fracture and matrix processes. In aquifers with naturally hot groundWaters (i.e., 30 °C in South India), heat injections can become difficult and cumbersome, considering strong density influences. Injecting Cold Water is a much more promising and innovative tracer technique. Injecting Cold Water reduces the energy stored in the matrix, as heat is released to the Colder circulating fluid in the fractures. Thus, Cold Water injections can produce very informative reference data for managing hot fractured aquifers using groundWater flow and Cold plume transport numerical modeling. Heat and Cold Water tracer tests have been performed for the first time in Choutuppal nearby Hyderabad in South India. Sub-horizontal fractures have been intersected by 30 wells drilled in a weathered granite aquifer. A saprolite layer of in average 14 m thickness covers the fractured granite system. The natural granite aquifer background temperature varies yearly between 30 °C and 35 °C. During the experiments, the natural aquifer background temperature was around 30.3 °C. The most explored well (CH03) is used as injection well for all experiments. There, an inflatable double packer system isolates one sub-horizontal fracture connecting CH3 with a pumping well (CH12) located at a 5.5 m distance. This setup allows successive 1-hour ijeetios of L of hot ater ∆T = ++ °CC aad old ater ∆T =-20 °C). The peak arrival times measured in CH12 are 41 minutes for heat and 51 minutes for Cold Water. The peak teeperature differeee easured i CH for heat is ∆T = ++. °C aad for old ater ∆T =-2.9 °C. This is consistent with the fact that density and viscosity decrease with higher temperatures. Remarkably, Cold Water shows a slightly faster first arrival. It might indicate that storing energy is slightly faster initiated than releasing energy from the matrix. First interpretations of the observed tailings show that for hot Water injection, the subsequent temperature decrease (back to the background T) seems slower than the observed temperature increase after the Cold Water injection. It seems that cooling the matrix (i.e. reducing the energy level) is slightly more time consuming and difficult than heating the matrix (i.e. storing energy). More experiments, e.g. repetitions of these experiments focusing stronger on the tailing for imaging matrix processes, complementing Cold Water tracing experiments (e.g. push-pull) and the possible parallel use of geophysical imaging tools, are ongoing. Nevertheless, the first tracer tests with Cold Water injections generated reference data that are very informative for further transport modeling (e.g. using Monte Carlo simulations)

  • Cold Water injections as innovative smart tracer technique in hot fractured aquifers
    2019
    Co-Authors: Hoffmann Richard, Wajid Uddin, Goderniaux Pascal, Dassargues Alain, Maréchal Jean-christophe, Chandra Subash, Tiwari, Virendra M., Selles Adrien
    Abstract:

    Robust transport simulations for sustainable management of groundWater in fractured rocks, need accurate observation data about fracture and matrix processes. In aquifers with naturally hot groundWaters (i.e., 30 ºC in South India), heat injections can become difficult and cumbersome, considering strong density influences. Injecting Cold Water is a much more promising and innovative tracer technique. Injecting Cold Water reduces the energy stored in the matrix, as heat is released to the Colder circulating fluid in the fractures. Thus, Cold Water injections can produce very informative reference data for managing hot fractured aquifers using groundWater flow and Cold plume transport numerical modeling. Heat and Cold Water tracer tests have been performed for the first time in Choutuppal nearby Hyderabad in South India. Sub-horizontal fractures have been intersected by 30 wells drilled in a weathered granite aquifer. A saprolite layer of in average 14 m thickness covers the fractured granite system. The natural granite aquifer background temperature varies yearly between 30 ºCand 35 ºC During the experiments, the natural aquifer background temperature was around 30.3 ºC The most explored well (CH03) is used as injection well for all experiments. There, an inflatable double packer system isolates one sub-horizontal fracture connecting CH03 with a pumping well (CH12) located at a 5.5 m distance. This set-up allows successive 1-hour injections of 1000 L of hot Water (ΔT = +20 ºC) and Cold Water (ΔT = -20 ºC). The peak arrival times measured in CH12 are 41 minutes for heat and 51 minutes for Cold Water. The peak temperature difference measured in CH12 for heat is ΔT = +3.3 ºC and for Cold Water ΔT = -2.9 ºC This is consistent with the fact that density and viscosity decrease with higher temperatures. Remarkably, Cold Water shows a slightly faster first arrival. It might indicate that storing energy is slightly faster initiated than releasing energy from the matrix. First interpretations of the observed tailings show that for hot Water injection, the subsequent temperature decrease (back to the background T) seems slower than the observed temperature increase after the Cold Water injection. It seems that cooling the matrix (i.e. reducing the energy level) is slightly more time consuming and difficult than heating the matrix (i.e. storing energy). More experiments, e.g. repetitions of these experiments focusing stronger on the tailing for imaging matrix processes, complementing Cold Water tracing experiments (e.g. push-pull) and the possible parallel use of geophysical imaging tools, are ongoing. Nevertheless, the first tracer tests with Cold Water injections generated reference data that are very informative for further transport modeling (e.g. using Monte Carlo simulations)

Moe Key - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Simulation of Cooling Damage to High Pour-Point Oil Reservoirs
    Petroleum Drilling Techniques, 2014
    Co-Authors: Moe Key
    Abstract:

    Aiming at the better understanding of cooling damage to high pour-point oil reservoirs,a numerical simulation was performed.The coupled multi-field equations solved by numerical method were used in describing the process of Injecting Cold Water in high pour-point oil reservoirs based on the physical model of phase component in pores,governing equation of wax precipitation and the Water-oil phase flow mathematical model and temperature field mathematical model.The simulation results show that the ratio of permeability after Water flooding to the original is about 0.85within 50meters from injection well after 30 hours of Water injection.The ratio of permeability after Water flooding to the original nearby the injector wellbore is constantly 0.87from the start of injection to 30hours after injection.The cooling damage range extends from 15to 93meters as Water injection time extends from 5to 30hours.The numerical simulation results of cooling damage to high pour-point oil reservoirs provide a theoretic base in their proper exploitation.

Wu Yan - One of the best experts on this subject based on the ideXlab platform.

  • Mechanism of cooling damage to high pour-point oil reservoir
    Journal of China University of Petroleum, 2009
    Co-Authors: Wu Yan
    Abstract:

    A mathematical model of cooling damage to high pour-point oil reservoir was established,considering three types of wax forms,three types of sedimentary processes and the exponential relationship between formation porosity and permeability.Three types of wax forms include solution in oil of wax components,suspension in oil of dispersed particles and sediment in pore surface,and three types of sedimentary processes include static sedimentation,dynamic sedimentation and pore throat captation.The application results show that variation of reservoir temperature field is the main controlling factor of affecting the development of high pour-point oil reservoir.The temperature near the wellbore quickly drops below the wax precipitation point and gradually advances out with Injecting Cold Water,and the wax particles gradually precipitate.With the production,the increasing degrees of the precipitated volume and sediment yield of wax decrease gradually near the wellbore of injector,but away from the injector,the trend is contrary.The wax sediment has great impact on well productivity,therefore,measures must be taken to prevent the cooling damage to formation.

Hoffmann Richard - One of the best experts on this subject based on the ideXlab platform.

  • Cold Water injections as innovative smart tracer technique in hot fractured aquifers
    2019
    Co-Authors: Hoffmann Richard, Wajid Uddin, Goderniaux Pascal, Dassargues Alain, Maréchal Jean-christophe, Chandra Subash, Tiwari, Virendra M., Selles Adrien
    Abstract:

    audience: researcher, professional, student, popularization, otherRobust transport simulations for sustainable management of groundWater in fractured rocks, need accurate observation data about fracture and matrix processes. In aquifers with naturally hot groundWaters (i.e., 30 ºC in South India), heat injections can become difficult and cumbersome, considering strong density influences. Injecting Cold Water is a much more promising and innovative tracer technique. Injecting Cold Water reduces the energy stored in the matrix, as heat is released to the Colder circulating fluid in the fractures. Thus, Cold Water injections can produce very informative reference data for managing hot fractured aquifers using groundWater flow and Cold plume transport numerical modeling. Heat and Cold Water tracer tests have been performed for the first time in Choutuppal nearby Hyderabad in South India. Sub-horizontal fractures have been intersected by 30 wells drilled in a weathered granite aquifer. A saprolite layer of in average 14 m thickness covers the fractured granite system. The natural granite aquifer background temperature varies yearly between 30 ºCand 35 ºC During the experiments, the natural aquifer background temperature was around 30.3 ºC The most explored well (CH03) is used as injection well for all experiments. There, an inflatable double packer system isolates one sub-horizontal fracture connecting CH03 with a pumping well (CH12) located at a 5.5 m distance. This set-up allows successive 1-hour injections of 1000 L of hot Water (ΔT = +20 ºC) and Cold Water (ΔT = -20 ºC). The peak arrival times measured in CH12 are 41 minutes for heat and 51 minutes for Cold Water. The peak temperature difference measured in CH12 for heat is ΔT = +3.3 ºC and for Cold Water ΔT = -2.9 ºC This is consistent with the fact that density and viscosity decrease with higher temperatures. Remarkably, Cold Water shows a slightly faster first arrival. It might indicate that storing energy is slightly faster initiated than releasing energy from the matrix. First interpretations of the observed tailings show that for hot Water injection, the subsequent temperature decrease (back to the background T) seems slower than the observed temperature increase after the Cold Water injection. It seems that cooling the matrix (i.e. reducing the energy level) is slightly more time consuming and difficult than heating the matrix (i.e. storing energy). More experiments, e.g. repetitions of these experiments focusing stronger on the tailing for imaging matrix processes, complementing Cold Water tracing experiments (e.g. push-pull) and the possible parallel use of geophysical imaging tools, are ongoing. Nevertheless, the first tracer tests with Cold Water injections generated reference data that are very informative for further transport modeling (e.g. using Monte Carlo simulations)

  • Cold Water injections as innovative smart tracer technique in hot fractured aquifers
    HAL CCSD, 2019
    Co-Authors: Hoffmann Richard, Goderniaux Pascal, Dassargues Alain, Maréchal Jean-christophe, Chandra Subash, Uddin Wajid, Tiwari Virendra, Selles Adrien
    Abstract:

    International audienceRobust transport simulations for sustainable management of groundWater in fractured rocks, need accurate observation data about fracture and matrix processes. In aquifers with naturally hot groundWaters (i.e., 30 °C in South India), heat injections can become difficult and cumbersome, considering strong density influences. Injecting Cold Water is a much more promising and innovative tracer technique. Injecting Cold Water reduces the energy stored in the matrix, as heat is released to the Colder circulating fluid in the fractures. Thus, Cold Water injections can produce very informative reference data for managing hot fractured aquifers using groundWater flow and Cold plume transport numerical modeling. Heat and Cold Water tracer tests have been performed for the first time in Choutuppal nearby Hyderabad in South India. Sub-horizontal fractures have been intersected by 30 wells drilled in a weathered granite aquifer. A saprolite layer of in average 14 m thickness covers the fractured granite system. The natural granite aquifer background temperature varies yearly between 30 °C and 35 °C. During the experiments, the natural aquifer background temperature was around 30.3 °C. The most explored well (CH03) is used as injection well for all experiments. There, an inflatable double packer system isolates one sub-horizontal fracture connecting CH3 with a pumping well (CH12) located at a 5.5 m distance. This setup allows successive 1-hour ijeetios of L of hot ater ∆T = ++ °CC aad old ater ∆T =-20 °C). The peak arrival times measured in CH12 are 41 minutes for heat and 51 minutes for Cold Water. The peak teeperature differeee easured i CH for heat is ∆T = ++. °C aad for old ater ∆T =-2.9 °C. This is consistent with the fact that density and viscosity decrease with higher temperatures. Remarkably, Cold Water shows a slightly faster first arrival. It might indicate that storing energy is slightly faster initiated than releasing energy from the matrix. First interpretations of the observed tailings show that for hot Water injection, the subsequent temperature decrease (back to the background T) seems slower than the observed temperature increase after the Cold Water injection. It seems that cooling the matrix (i.e. reducing the energy level) is slightly more time consuming and difficult than heating the matrix (i.e. storing energy). More experiments, e.g. repetitions of these experiments focusing stronger on the tailing for imaging matrix processes, complementing Cold Water tracing experiments (e.g. push-pull) and the possible parallel use of geophysical imaging tools, are ongoing. Nevertheless, the first tracer tests with Cold Water injections generated reference data that are very informative for further transport modeling (e.g. using Monte Carlo simulations)

  • Cold Water injections as innovative smart tracer technique in hot fractured aquifers
    2019
    Co-Authors: Hoffmann Richard, Wajid Uddin, Goderniaux Pascal, Dassargues Alain, Maréchal Jean-christophe, Chandra Subash, Tiwari, Virendra M., Selles Adrien
    Abstract:

    Robust transport simulations for sustainable management of groundWater in fractured rocks, need accurate observation data about fracture and matrix processes. In aquifers with naturally hot groundWaters (i.e., 30 ºC in South India), heat injections can become difficult and cumbersome, considering strong density influences. Injecting Cold Water is a much more promising and innovative tracer technique. Injecting Cold Water reduces the energy stored in the matrix, as heat is released to the Colder circulating fluid in the fractures. Thus, Cold Water injections can produce very informative reference data for managing hot fractured aquifers using groundWater flow and Cold plume transport numerical modeling. Heat and Cold Water tracer tests have been performed for the first time in Choutuppal nearby Hyderabad in South India. Sub-horizontal fractures have been intersected by 30 wells drilled in a weathered granite aquifer. A saprolite layer of in average 14 m thickness covers the fractured granite system. The natural granite aquifer background temperature varies yearly between 30 ºCand 35 ºC During the experiments, the natural aquifer background temperature was around 30.3 ºC The most explored well (CH03) is used as injection well for all experiments. There, an inflatable double packer system isolates one sub-horizontal fracture connecting CH03 with a pumping well (CH12) located at a 5.5 m distance. This set-up allows successive 1-hour injections of 1000 L of hot Water (ΔT = +20 ºC) and Cold Water (ΔT = -20 ºC). The peak arrival times measured in CH12 are 41 minutes for heat and 51 minutes for Cold Water. The peak temperature difference measured in CH12 for heat is ΔT = +3.3 ºC and for Cold Water ΔT = -2.9 ºC This is consistent with the fact that density and viscosity decrease with higher temperatures. Remarkably, Cold Water shows a slightly faster first arrival. It might indicate that storing energy is slightly faster initiated than releasing energy from the matrix. First interpretations of the observed tailings show that for hot Water injection, the subsequent temperature decrease (back to the background T) seems slower than the observed temperature increase after the Cold Water injection. It seems that cooling the matrix (i.e. reducing the energy level) is slightly more time consuming and difficult than heating the matrix (i.e. storing energy). More experiments, e.g. repetitions of these experiments focusing stronger on the tailing for imaging matrix processes, complementing Cold Water tracing experiments (e.g. push-pull) and the possible parallel use of geophysical imaging tools, are ongoing. Nevertheless, the first tracer tests with Cold Water injections generated reference data that are very informative for further transport modeling (e.g. using Monte Carlo simulations)

Imaro Tulus - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Thermal Shock on the Creation of Microfractures and Mechanical Properties of Various Volcanic Rock Types, including Samples from the Indonesian Geothermal Field (Tangkuban Perahu)
    2017
    Co-Authors: Imaro Tulus
    Abstract:

    This thesis aims at investigating the effect of a thermal shock of a couple of hundred degrees on the creation of the thermal microfractures and in what way the mechanical properties of volcanic rocks change. In the geothermal field, thermal microfractures can contribute to increase the permeability and produce more steam to the surface. We exposed basaltic andesite and andesite rocks from Tangkuban Perahu (Indonesia), a granite from Benin (West Africa), a basalt from the Eifel (Germany) and a basalt rock from Reynifsjara (Iceland) to temperatures of 200, 300, 400 and 500°C before cooling them rapidly by placing them in Cold 20°C Water. Initially, most of the sample rocks show less than 1% of porosity, excluding andesite Tangkuban Perahu (~6%) and basalt Reynisfjara (~14%), and permeability for all rocks is below detectable value (2.6 mD by Ruska gas permeameter for specified core geometry). In the geothermal field scenario, it indicates the pores were not connected and the steam may not easily flow through the rock. After the heating stage and thermal cooling, significantly increased values of porosity are observed in most of the rocks. However, only the two high porosity rocks gained permeability; the andesite Tangkuban Perahu (7-11 mD) and basalt Reynisfjara (4.45 mD). The changes in Young’s modulus, Poisson’s ratio and ultimate compressive strength of the various samples were also determined by using an unconfined Uniaxial Compressive Strength (UCS) apparatus in which both heat treated and non-heat treated samples were placed. The results show the rock strength decreases with increasing thermal shock. Similarly, we see a decrease in both Young’s modulus and Poisson’s ratio with increasing thermal shock. To recognize the thermal shock effect visually, the samples were imaged using a micro-CT scan before and after heating treatment. The resolution of the CT scanner was 30 μm at best when the whole sample is scanned. It is noticed that the porosity increases after the heating experiment. Additional mini-cores (~10 mm x 8 mm) from the whole core are also scanned at 14 μm resolution. The scans showed the porosity on the outside part of the cores is up to 10 times higher than the inner part. In Indonesia, the geothermal reservoir temperature varies from 200-300oC. By Injecting Cold Water from the surface at a high rate, the Water temperature remains low and can thus create the thermal shock that opens up existing fractures and forms new ones. In that way, it can increase fluid path ways around the well bore and along existing natural fractures.Applied Earth Science