Investigation Of The Effect Of Non Darcy Flow And Multi Phase Flow On The Productivity Of Hydraulically Fractured Gas Wells
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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.
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.
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.
The Analysis And Prediction Of Well Performance For Hydraulically Fractured Wells Using Reservoir Modelling Techniques
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Author : Gas Research Institute
language : en
Publisher:
Release Date : 1990
The Analysis And Prediction Of Well Performance For Hydraulically Fractured Wells Using Reservoir Modelling Techniques written by Gas Research Institute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Gas reservoirs categories.
Since 1983, numerous cooperative research wells and Staged Field Experiments have been conducted in the Travis Peak formation in east Texas by the Gas Research Institute (GRI). Many of the wells analyzed have exhibited slow fracture fluid cleanup. In these cases, several days or weeks of flow were required after the treatment before significant gas flow was measured. For these same wells, post-fracture pressure buildup data were often difficult to analyze with confidence using conventional analysis methods. As such, a research project was undertaken to better understand post-fracture production and pressure transient behavior. The objective of the research project was to investigate fractures that affected fracture fluid injection, fracture fluid inhibition and fracture fluid cleanup in wells that are completed in low permeability gas reservoirs. It was also important to determine which of the factors most affected the analysis of post-fracture pressure transient data and the ultimate gas recovery. Before these items could be studied in detail, however, it was also necessary to learn how to model correctly these effects by taking into account factors such as formation damage, fracture conductivity damage, non-Darcy flow, relative permeability hysteresis and capillary pressure effects. The result of this research showed that fracture conductivity must be high enough to allow proper fracture fluid cleanup prior to running a pressure transient test. If the fracture has not cleaned up sufficiently, the incorrect result will be obtained from conventional pressure transient test methods. Even if most of the fluid has been cleaned up, the results obtained from conventional methods should only be considered first order approximations. The engineer must then take these estimates and use reservoir simulation methods to history match the production and pressure transient data in order to better analyze the formation and fracture properties. The research also demonstrated that producing a well on a small choke after a fracture treament will maximize ultimate gas recovery. If severe crushing of the proppant occurs due to rapid pressure drawdown, then fracture fluid can be trapped in and around the fracture which will tend to suppress gas production and reduce ultimate gas recovery. In summary, the reservoir engineering research has led to the conclusion that multilayered, multiphase reservoir systems such as are normally encountered in low permeability rocks are difficult to evaluate with accuracy unless multiphase, multilayered reservoir models are used to history match all of the available data.
Proceedings Of The International Field Exploration And Development Conference 2020
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Author : Jia'en Lin
language : en
Publisher: Springer Nature
Release Date : 2021-06-17
Proceedings Of The International Field Exploration And Development Conference 2020 written by Jia'en Lin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-17 with Technology & Engineering categories.
This book is a compilation of selected papers from the 10th International Field Exploration and Development Conference (IFEDC 2020). The proceedings focuses on Reservoir Surveillance and Management, Reservoir Evaluation and Dynamic Description, Reservoir Production Stimulation and EOR, Ultra-Tight Reservoir, Unconventional Oil and Gas Resources Technology, Oil and Gas Well Production Testing, Geomechanics. The conference not only provides a platform to exchanges experience, but also promotes the development of scientific research in oil & gas exploration and production. The main audience for the work includes reservoir engineer, geological engineer, enterprise managers senior engineers as well as professional students.
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.
Petroleum Abstracts
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Author :
language : en
Publisher:
Release Date : 1996
Petroleum Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Petroleum categories.
Spe Production Operations
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Author :
language : en
Publisher:
Release Date : 2006
Spe Production Operations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Oil fields 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.