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- W2131667319 abstract "PreviousNext No AccessUnconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013Non-Linearity in Decline Behavior of Unconventional WellsAuthors: James R. GilmanSepehr FadaeiJames R. GilmaniRservoir.com, Inc.Search for more papers by this author and Sepehr FadaeiiRservoir.com, Inc.Search for more papers by this authorhttps://doi.org/10.1190/urtec2013-282 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract URTeC 1577279 This paper illustrates the impact of various complex behaviors on the long-term decline of unconventional wells. These are illustrated through numerical simulations and field production data which are compared to the various forms of expected decline behavior. The simulations are based on modeling and history matching of unconventional systems developed with horizontal wells and multi-stage hydraulic fractures. This paper focuses on tight oil systems. There are many instances where idealized plots are useful for diagnosing and comparing well performance (e.g. hyperbolic decline (Arps), square-root of time, power-law exponential, other hybrid methods and type curves). However, in many cases such decline curves do not adequately describe long-term production behavior. Early in the well life it is especially difficult to determine which relation will best fit the long term performance. Also as new wells are added interference can cause significant deviations from the earlier behavior. This paper will illustrate the causes and characteristics of long-term decline in complex systems to aid as a guide in estimating long-term decline behavior. The results of this work illustrate the reasons for deviation from ideal behavior such as changing compressibility and total mobility during multi-phase flow, heterogeneous matrix properties, presence of natural fractures, fracture and matrix compaction and non-uniform hydraulic fracturing. Also, some methods are not applicable for variable rate or variable pressure production scenarios (the most common state of actual well production). The paper addresses the following issues 1) Illustrates non-ideal decline behavior of unconventional reservoirs based on fluid characteristics; 2) Illustrates non-ideal decline behavior of unconventional reservoirs based on reservoir complexities; 3) Limitations of rate transient analysis and decline curve analysis methods. Keywords: numerical, unconventional, fractures, fluidPermalink: https://doi.org/10.1190/urtec2013-282FiguresReferencesRelatedDetailsCited ByAccelerating Tight Reservoir Workflows With GPUs23 February 2015Estimation of Stimulated Reservoir Volume Using the Concept of Shale Capacity and its Validation with Microseismic and Well Performance: Application to the Marcellus and Haynesville17 April 2014Estimation of Stimulated Reservoir Volume Using the Concept of Shale Capacity and its Validation with Microseismic and Well Performance25 February 2014 Unconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013ISSN (online):2159-6832Copyright: 2013 Pages: 1229 publication data© 2013 Published in electronic format with permission by the Society of Exploration Geophysicists, American Association of Petroleum Geologists, and Society of Petroleum EngineersPublisher:Unconventional Resources Technology ConferenceSociety of Exploration Geophysicists HistoryPublished: 26 Sep 2013 CITATION INFORMATION James R. Gilman and Sepehr Fadaei, (2013), Non-Linearity in Decline Behavior of Unconventional Wells, SEG Global Meeting Abstracts : 2702-2712. https://doi.org/10.1190/urtec2013-282 Plain-Language Summary KeywordsnumericalunconventionalfracturesfluidPDF DownloadLoading ..." @default.
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- W2131667319 title "Non-Linearity in Decline Behavior of Unconventional Wells" @default.
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