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Claudio Alimonti - One of the best experts on this subject based on the ideXlab platform.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    Journal of Energy Resources Technology-transactions of The Asme, 2008
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPRs), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behavior in the well. A steady-state IPRs are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. The transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at the surface and the bottomhole pressure is measured. The pressure buildup (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g., phase change, flow reversal, and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artifacts. This paper introduces a method to derive the transient IPRs at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial coordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps, and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental setup was carried out. The setup would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region, and the well, represented by a pressured vessel, a cylindrical porous medium, and a vertical pipe, respectively.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering, 2007
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.Copyright © 2007 by ASME

Aldo Costantini - One of the best experts on this subject based on the ideXlab platform.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    Journal of Energy Resources Technology-transactions of The Asme, 2008
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPRs), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behavior in the well. A steady-state IPRs are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. The transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at the surface and the bottomhole pressure is measured. The pressure buildup (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g., phase change, flow reversal, and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artifacts. This paper introduces a method to derive the transient IPRs at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial coordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps, and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental setup was carried out. The setup would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region, and the well, represented by a pressured vessel, a cylindrical porous medium, and a vertical pipe, respectively.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering, 2007
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.Copyright © 2007 by ASME

Gioia Falcone - One of the best experts on this subject based on the ideXlab platform.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    Journal of Energy Resources Technology-transactions of The Asme, 2008
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPRs), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behavior in the well. A steady-state IPRs are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. The transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at the surface and the bottomhole pressure is measured. The pressure buildup (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g., phase change, flow reversal, and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artifacts. This paper introduces a method to derive the transient IPRs at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial coordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps, and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental setup was carried out. The setup would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region, and the well, represented by a pressured vessel, a cylindrical porous medium, and a vertical pipe, respectively.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering, 2007
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.Copyright © 2007 by ASME

G F Hewitt - One of the best experts on this subject based on the ideXlab platform.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    Journal of Energy Resources Technology-transactions of The Asme, 2008
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPRs), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behavior in the well. A steady-state IPRs are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. The transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at the surface and the bottomhole pressure is measured. The pressure buildup (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g., phase change, flow reversal, and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artifacts. This paper introduces a method to derive the transient IPRs at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial coordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps, and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental setup was carried out. The setup would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region, and the well, represented by a pressured vessel, a cylindrical porous medium, and a vertical pipe, respectively.

  • using transient inflow performance relationships to model the dynamic interaction between reservoir and wellbore during pressure testing
    ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering, 2007
    Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio Alimonti
    Abstract:

    The fundamental understanding of the dynamic interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, Homogeneous Rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the dynamic interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.Copyright © 2007 by ASME

Rapu S. A. - One of the best experts on this subject based on the ideXlab platform.

  • The volcanic Rocks of Easter Island (Chile) and their use for the Moai sculptures
    E. Schweizerbart Science publishers, 2010
    Co-Authors: Gioncada A., Gonzalez-ferranb O., Lezzerini M., Mazzuoli R., Bisson M., Rapu S. A.
    Abstract:

    Easter Island (Chile) is a volcanic island made up entirely of volcanic Rocks, which are represented by lava flows and domes as well as cinder and scoria pyroclastic cones, covering the entire compositional range from basalts to peralkaline rhyolites. Apart from representing a cultural heritage of worldwide importance, the megalithic Moai statues of Easter Island are an exquisite example of the utilisation of a variety of volcanic Rocks in sculpture. This work illustrates the spectrum of volcanic litho-types available to the islanders through new chemical and petrographic data and presents chemical, mineralogical, petrographic and physical data on the Rocks from the same volcanic deposits used for fashioning the megalithic sculptures. The stones used for the statues and their topknots are represented by volcanic Rocks with different depositional mechanisms and chemical compositions. They include tuffs deposited in water, subaerial welded scoriae, lava flows and lava domes, with compositions ranging from basalt to trachyte. Despite such variations, they all share rather high total porosity, and are all easily workable stones. Their low apparent density seems to be the critical factor in enabling such large statues to be fashioned. The rest of the volcanic Rocks on the island were unsuitable for building megalithic sculptures for various reasons: they are either too heavy, as is the case of the basaltic lavas, or too fragile, as the obsidian, or too loose, as the unconsolidated tuff and scoria cones. The Rocks used for the platforms and altars are lavas whose compositions vary moderately, from basaltic to mugearitic, but which share similar physical and mechanical properties, well suited to building stable bases for the statues. The results of the study on the Rano Raraku tuff, employed in the great majority of the statues, show that it consists of a hyalotuff, in which volcanic glass was altered by interaction with sea water. The products of alteration vary in composition from nearly amorphous palagonite to crystalline smectite. The magma that erupted at Rano Raraku was originally mugearitic, and the high loss on ignition (LOI) and low alkali content of the Rock, as well as its high clay content, are characteristics stemming from glass-sea water interactions during the deposit formation. The samples taken from the base, middle and top of the cone flank hosting the quarries show very similar composition of the bulk Rock, the fresh glass and the palagonite products, suggesting Homogeneous Rock characteristics throughout the quarries

  • The volcanic Rocks of Easter Island (Chile) and their use for the Moai sculptures
    'Schweizerbart', 2010
    Co-Authors: Gioncada A., Gonzalez-ferranb O., Lezzerini M., Mazzuoli R., Bisson M., Rapu S. A.
    Abstract:

    Easter Island (Chile) is a volcanic island made up entirely of volcanic Rocks, which are represented by lava flows and domes as well as cinder and scoria pyroclastic cones, covering the entire compositional range from basalts to peralkaline rhyolites. Apart from representing a cultural heritage of worldwide importance, the megalithic Moai statues of Easter Island are an exquisite example of the utilisation of a variety of volcanic Rocks in sculpture. This work illustrates the spectrum of volcanic litho-types available to the islanders through new chemical and petrographic data and presents chemical, mineralogical, petrographic and physical data on the Rocks from the same volcanic deposits used for fashioning the megalithic sculptures. The stones used for the statues and their topknots are represented by volcanic Rocks with different depositional mechanisms and chemical compositions. They include tuffs deposited in water, subaerial welded scoriae, lava flows and lava domes, with compositions ranging from basalt to trachyte. Despite such variations, they all share rather high total porosity, and are all easily workable stones. Their low apparent density seems to be the critical factor in enabling such large statues to be fashioned. The rest of the volcanic Rocks on the island were unsuitable for building megalithic sculptures for various reasons: they are either too heavy, as is the case of the basaltic lavas, or too fragile, as the obsidian, or too loose, as the unconsolidated tuff and scoria cones. The Rocks used for the platforms and altars are lavas whose compositions vary moderately, from basaltic to mugearitic, but which share similar physical and mechanical properties, well suited to building stable bases for the statues. The results of the study on the Rano Raraku tuff, employed in the great majority of the statues, show that it consists of a hyalotuff, in which volcanic glass was altered by interaction with sea water. The products of alteration vary in composition from nearly amorphous palagonite to crystalline smectite. The magma that erupted at Rano Raraku was originally mugearitic, and the high loss on ignition (LOI) and low alkali content of the Rock, as well as its high clay content, are characteristics stemming from glass-sea water interactions during the deposit formation. The samples taken from the base, middle and top of the cone flank hosting the quarries show very similar composition of the bulk Rock, the fresh glass and the palagonite products, suggesting Homogeneous Rock characteristics throughout the quarries.Published855-8673.5. Geologia e storia dei vulcani ed evoluzione dei magmi3.10. Storia ed archeologia applicate alle Scienze della TerraJCR Journalreserve