Modeling of fiber bridging in fluid flow for well stimulation applications

Abstract Accurate acid placement constitutes a major concern in matrix stimulation because the acid tends to penetrate the zones of least resistance while leaving the low-permeability regions of the formation untreated. Degradable materials (fibers and solid particles) have recently shown a good cap...

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Autores principales:	Mehdi Ghommem, Mustapha Abbad, Gallyam Aidagulov, Steve Dyer, Dominic Brady
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Fiber bridging Fiber flocculation Modeling and numerical simulation Discrete element method Fiber–fluid coupling Sensitivity analysis Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/2512532e9b5c4abc8076ea69db45feaa
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spelling	oai:doaj.org-article:2512532e9b5c4abc8076ea69db45feaa2021-12-02T11:12:43ZModeling of fiber bridging in fluid flow for well stimulation applications10.1007/s12182-019-00398-w1672-51071995-8226https://doaj.org/article/2512532e9b5c4abc8076ea69db45feaa2019-11-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-00398-whttps://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Accurate acid placement constitutes a major concern in matrix stimulation because the acid tends to penetrate the zones of least resistance while leaving the low-permeability regions of the formation untreated. Degradable materials (fibers and solid particles) have recently shown a good capability as fluid diversion to overcome the issues related to matrix stimulation. Despite the success achieved in the recent acid stimulation jobs stemming from the use of some products that rely on fiber flocculation as the main diverting mechanism, it was observed that the volume of the base fluid and the loading of the particles are not optimized. The current industry lacks a scientific design guideline because the used methodology is based on experience or empirical studies in a particular area with a particular product. It is important then to understand the fundamentals of how acid diversion works in carbonates with different diverting mechanisms and diverters. Mathematical modeling and computer simulations are effective tools to develop this understanding and are efficiently applied to new product development, new applications of existing products or usage optimization. In this work, we develop a numerical model to study fiber dynamics in fluid flow. We employ a discrete element method in which the fibers are represented by multi-rigid-body systems of interconnected spheres. The discrete fiber model is coupled with a fluid flow solver to account for the inherent simultaneous interactions. The focus of the study is on the tendency for fibers to flocculate and bridge when interacting with suspending fluids and encountering restrictions that can be representative of fractures or wormholes in carbonates. The trends of the dynamic fiber behavior under various operating conditions including fiber loading, flow rate and fluid viscosity obtained from the numerical model show consistency with experimental observations. The present numerical investigation reveals that the bridging capability of the fiber–fluid system can be enhanced by increasing the fiber loading, selecting fibers with higher stiffness, reducing the injection flow rate, reducing the suspending fluid viscosity or increasing the attractive cohesive forces among fibers by using sticky fibers.Mehdi GhommemMustapha AbbadGallyam AidagulovSteve DyerDominic BradyKeAi Communications Co., Ltd.articleFiber bridgingFiber flocculationModeling and numerical simulationDiscrete element methodFiber–fluid couplingSensitivity analysisScienceQPetrologyQE420-499ENPetroleum Science, Vol 17, Iss 3, Pp 671-686 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fiber bridging Fiber flocculation Modeling and numerical simulation Discrete element method Fiber–fluid coupling Sensitivity analysis Science Q Petrology QE420-499
spellingShingle	Fiber bridging Fiber flocculation Modeling and numerical simulation Discrete element method Fiber–fluid coupling Sensitivity analysis Science Q Petrology QE420-499 Mehdi Ghommem Mustapha Abbad Gallyam Aidagulov Steve Dyer Dominic Brady Modeling of fiber bridging in fluid flow for well stimulation applications
description	Abstract Accurate acid placement constitutes a major concern in matrix stimulation because the acid tends to penetrate the zones of least resistance while leaving the low-permeability regions of the formation untreated. Degradable materials (fibers and solid particles) have recently shown a good capability as fluid diversion to overcome the issues related to matrix stimulation. Despite the success achieved in the recent acid stimulation jobs stemming from the use of some products that rely on fiber flocculation as the main diverting mechanism, it was observed that the volume of the base fluid and the loading of the particles are not optimized. The current industry lacks a scientific design guideline because the used methodology is based on experience or empirical studies in a particular area with a particular product. It is important then to understand the fundamentals of how acid diversion works in carbonates with different diverting mechanisms and diverters. Mathematical modeling and computer simulations are effective tools to develop this understanding and are efficiently applied to new product development, new applications of existing products or usage optimization. In this work, we develop a numerical model to study fiber dynamics in fluid flow. We employ a discrete element method in which the fibers are represented by multi-rigid-body systems of interconnected spheres. The discrete fiber model is coupled with a fluid flow solver to account for the inherent simultaneous interactions. The focus of the study is on the tendency for fibers to flocculate and bridge when interacting with suspending fluids and encountering restrictions that can be representative of fractures or wormholes in carbonates. The trends of the dynamic fiber behavior under various operating conditions including fiber loading, flow rate and fluid viscosity obtained from the numerical model show consistency with experimental observations. The present numerical investigation reveals that the bridging capability of the fiber–fluid system can be enhanced by increasing the fiber loading, selecting fibers with higher stiffness, reducing the injection flow rate, reducing the suspending fluid viscosity or increasing the attractive cohesive forces among fibers by using sticky fibers.
format	article
author	Mehdi Ghommem Mustapha Abbad Gallyam Aidagulov Steve Dyer Dominic Brady
author_facet	Mehdi Ghommem Mustapha Abbad Gallyam Aidagulov Steve Dyer Dominic Brady
author_sort	Mehdi Ghommem
title	Modeling of fiber bridging in fluid flow for well stimulation applications
title_short	Modeling of fiber bridging in fluid flow for well stimulation applications
title_full	Modeling of fiber bridging in fluid flow for well stimulation applications
title_fullStr	Modeling of fiber bridging in fluid flow for well stimulation applications
title_full_unstemmed	Modeling of fiber bridging in fluid flow for well stimulation applications
title_sort	modeling of fiber bridging in fluid flow for well stimulation applications
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/2512532e9b5c4abc8076ea69db45feaa
work_keys_str_mv	AT mehdighommem modelingoffiberbridginginfluidflowforwellstimulationapplications AT mustaphaabbad modelingoffiberbridginginfluidflowforwellstimulationapplications AT gallyamaidagulov modelingoffiberbridginginfluidflowforwellstimulationapplications AT stevedyer modelingoffiberbridginginfluidflowforwellstimulationapplications AT dominicbrady modelingoffiberbridginginfluidflowforwellstimulationapplications
_version_	1718396100681924608

Modeling of fiber bridging in fluid flow for well stimulation applications

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