The Impact Of Gravity Segregation On Multiphase Non Darcy Flow In Hydraulically Fractured Gas Wells
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The Impact Of Gravity Segregation On Multiphase Non Darcy Flow In Hydraulically Fractured Gas Wells
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Author : Mark Ian Dickins
language : en
Publisher:
Release Date : 2008
The Impact Of Gravity Segregation On Multiphase Non Darcy Flow In Hydraulically Fractured Gas Wells written by Mark Ian Dickins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Multiphase and non-Darcy flow effects in hydraulically fractured gas wells reduce effective fracture conductivity. Typical proppant pack laboratory experiments are oriented in such a way such that phase segregation is not possible, which results in mixed flow. Tidwell and Parker (1996), however, showed that in proppant packs, gravity segregation occurs for simultaneous gas and liquid injection at laboratory scale (1500 cm2). Although the impact of gravity on flow in natural fractures has been described, previous work has not fully described the effect of gravity on multiphase non-Darcy flow in hydraulic fractures. In this work, reservoir simulation modeling was used to determine the extent and impact of gravity segregation in a hydraulic fracture at field scale. I found that by ignoring segregation, effective fracture conductivity can be underestimated by up to a factor of two. An analytical solution was developed for uniform flux of water and gas into the fracture. The solution for pressures and saturations in the fracture agrees well with reservoir simulation. Gravity segregation occurs in moderate-to-high conductivity fractures. Gravity segregation impacts effective fracture conductivity when gas and liquid are being produced at all water-gas ratios modeled above 2 Bbls per MMscf. More realistic, non-uniform-flux models were also run with the hydraulic fracture connected to a gas reservoir producing water. For constant-gas-rate production, differences in pressure drop between segregated cases and mixed flow cases range up to a factor of two. As the pressure gradient in the fracture increases above 1 to 2 psi/ft, the amount of segregation decreases. Segregation is also less for fracture half-length-to-height ratios less than or close to two. When there is less segregation, the difference in effective conductivity between the segregated and mixed flow cases is reduced. I also modeled the water injection and cleanup phases for a typical slickwater fracture treatment both with and without gravity effects and found that for cases with segregation, effective fracture conductivity is significantly higher than the conductivity when mixed flow occurs. Gravity segregation is commonly ignored in design and analysis of hydraulically fractured gas wells. This work shows that segregation is an important physical process and it affects effective fracture conductivity significantly. Hydraulic fracture treatments can be designed more effectively if effective fracture conductivity is known more accurately.
Investigation Of The Effect Of Non Darcy Flow And Multi Phase Flow On The Productivity Of Hydraulically Fractured Gas Wells
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Author : Nasraldin Abdulslam A. Alarbi
language : en
Publisher:
Release Date : 2011
Investigation Of The Effect Of Non Darcy Flow And Multi Phase Flow On The Productivity Of Hydraulically Fractured Gas Wells written by Nasraldin Abdulslam A. Alarbi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Hydraulic fracturing has recently been the completion of choice for most tight gas bearing formations. It has proven successful to produce these formations in a commercial manner. However, some considerations have to be taken into account to design an optimum stimulation treatment that leads to the maximum possible productivity. These considerations include, but not limited to, non-Darcy flow and multiphase flow effects inside the fracture. These effects reduce the fracture conductivity significantly. Failing to account for that results in overestimating the deliverability of the well and, consequently, to designing a fracture treatment that is not optimum. In this work a thorough investigation of non-Darcy flow and multi-phase flow effects on the productivity of hydraulically fractured wells is conducted and an optimum fracture design is proposed for a tight gas formation in south Texas using the Unified Fracture Design (UFD) Technique to compensate for the mentioned effects by calculating the effective fracture permeability in an iterative way. Incorporating non-Darcy effects results in an optimum fracture that is shorter and wider than the fracture when only Darcy calculations are considered. That leads to a loss of production of 5, 18% due to dry and multiphase non-Darcy flow effects respectively. A comparison between the UFD and 3D simulators is also done to point out the differences in terms of methodology and results. Since UFD incorporated the maximum dimensionless productivity index in the fracture dimensions design, unlike 3D simulators, it can be concluded that using UFD to design the fracture treatment and then use the most important fracture parameters outputs (half length and CfDopt) as inputs in the simulators is a recommended approach.
Non Darcy Flow And Multi Phase Flow
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Author : Nasraldin Alarbi
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2011-12
Non Darcy Flow And Multi Phase Flow written by Nasraldin Alarbi and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-12 with categories.
Hydraulic fracturing has recently been the completion of choice for most tight gas formations. It has proven successful to produce these formations in a commercial manner. However, some considerations have to be taken into account when designing a fracture treatment. These considerations include, but not limited to, non-Darcy flow and multiphase flow effects inside the fracture. These effects reduce the fracture conductivity significantly. Failing to account for that results in overestimating the deliverability of the wells and, consequently, to designing a fracture treatment that is not optimum. In this book a thorough investigation of non-Darcy flow and multi-phase flow effects on the productivity of hydraulically fractured gas wells is conducted and an optimum fracture design is proposed for a tight gas formation in south Texas using the Unified Fracture Design (UFD) Technique to compensate for the mentioned effects by calculating the effective fracture permeability in an iterative way. A comparison between the UFD and the most well known 3D fracture simulators is also carried out to point out the differences as far as the methodology and design considerations.
A Qualitative Analysis Of Non Darcy Flow Effects In Hydraulically Fractured Gas Wells
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Author : Joanne Carol Hresko
language : en
Publisher:
Release Date : 1985
A Qualitative Analysis Of Non Darcy Flow Effects In Hydraulically Fractured Gas Wells written by Joanne Carol Hresko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Gas reservoirs categories.
Behavior Of Hydraulically Fractured Gas Wells In The Presence Of Reservoir And Fracture Non Darcy Flow
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Author : Albert Jason Stark
language : en
Publisher:
Release Date : 1998
Behavior Of Hydraulically Fractured Gas Wells In The Presence Of Reservoir And Fracture Non Darcy Flow written by Albert Jason Stark and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Behavior Of Hydraulically Fractured Gas Wells In The Presence Of Reservoir And Fracture Non Darcy Flow
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Author :
language : en
Publisher:
Release Date : 1999
Behavior Of Hydraulically Fractured Gas Wells In The Presence Of Reservoir And Fracture Non Darcy Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Effects Of Non Darcy Flow On Pressure Buildup Analysis Of Hydraulically Fractured Gas Reservoirs
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Author : Cesar Alvarez Vera
language : en
Publisher:
Release Date : 2001
Effects Of Non Darcy Flow On Pressure Buildup Analysis Of Hydraulically Fractured Gas Reservoirs written by Cesar Alvarez Vera and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Decline Curve Analysis For Real Gas Wells With Non Darcy Flow
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Author : Michael Lee Fraim
language : en
Publisher:
Release Date : 1989
Decline Curve Analysis For Real Gas Wells With Non Darcy Flow written by Michael Lee Fraim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Gas well drilling categories.
Multiphase Flow In Wells
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Author : James P. Brill
language : en
Publisher: Henry L. Doherty Memorial Fund of Aime Society of Petroleum
Release Date : 1999
Multiphase Flow In Wells written by James P. Brill and has been published by Henry L. Doherty Memorial Fund of Aime Society of Petroleum this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Technology & Engineering categories.
Combined Effect Of Non Darcy Flow And Formation On Gas Well Performance In Dual Porosity Dual Permeability Reservoirs
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Author : Carlos Alberto Pereira Tavares
language : en
Publisher:
Release Date : 2003
Combined Effect Of Non Darcy Flow And Formation On Gas Well Performance In Dual Porosity Dual Permeability Reservoirs written by Carlos Alberto Pereira Tavares and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Darcy's law categories.