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    Low-Dimensional Modeling of a Pumping Unit to Cope With Multiphase Flow

    Source: Journal of Dynamic Systems, Measurement, and Control:;2017:;volume( 139 ):;issue: 004::page 41010
    Author:
    Omrani, Ala E.
    ,
    Franchek, Matthew A.
    ,
    Ebrahimi, Behrouz
    ,
    Mutlu, Mete
    ,
    Grigoriadis, Karolos
    DOI: 10.1115/1.4035011
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Pumping unit efficiency is highly disturbed by the presence of gas influx reducing the productivity and inducing unpredictable system response due to the change of its intrinsic properties such as the natural frequency. A poor estimation of those properties may affect the on-field crew and system safety as well as the production rate. The purpose of this paper is to construct a hydromechanical model describing the coupled multiphase flow-pumping unit system dynamics and to develop a procedure to control the pumping speed for safety assurance and oil production maximization. A coupled mechanical-multiphase flow model capturing the interplay between the gas void fraction (GVF) and the driving harmonic force of the pumping unit is developed. Specifically, the predicted downhole pressure is used to determine the sucker rod effective load. Consequently, a reduced-order model, capturing the dynamics of the sucker rod, is used to estimate the saddle bearings axial displacements which are function of polished rod loading. An error-driven adaptation using the difference between presumed bearing displacement with known GVF and the predicted bearing displacement from the proposed multiphysics model is employed to estimate the unknown downhole GVF. The obtained results prove that the adaptation allows an accurate evaluation of the pumped fluid's GVF, thereby circumventing the need for a costly and inaccurate measurement of the two-phase flow gas fraction. Based on this estimation, a control strategy is then proposed to regulate the pump speed while avoiding the resonance frequency of the sucker-rod system.
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      Low-Dimensional Modeling of a Pumping Unit to Cope With Multiphase Flow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4236616
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    • Journal of Dynamic Systems, Measurement, and Control

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    contributor authorOmrani, Ala E.
    contributor authorFranchek, Matthew A.
    contributor authorEbrahimi, Behrouz
    contributor authorMutlu, Mete
    contributor authorGrigoriadis, Karolos
    date accessioned2017-11-25T07:20:43Z
    date available2017-11-25T07:20:43Z
    date copyright2017/9/2
    date issued2017
    identifier issn0022-0434
    identifier otherds_139_04_041010.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4236616
    description abstractPumping unit efficiency is highly disturbed by the presence of gas influx reducing the productivity and inducing unpredictable system response due to the change of its intrinsic properties such as the natural frequency. A poor estimation of those properties may affect the on-field crew and system safety as well as the production rate. The purpose of this paper is to construct a hydromechanical model describing the coupled multiphase flow-pumping unit system dynamics and to develop a procedure to control the pumping speed for safety assurance and oil production maximization. A coupled mechanical-multiphase flow model capturing the interplay between the gas void fraction (GVF) and the driving harmonic force of the pumping unit is developed. Specifically, the predicted downhole pressure is used to determine the sucker rod effective load. Consequently, a reduced-order model, capturing the dynamics of the sucker rod, is used to estimate the saddle bearings axial displacements which are function of polished rod loading. An error-driven adaptation using the difference between presumed bearing displacement with known GVF and the predicted bearing displacement from the proposed multiphysics model is employed to estimate the unknown downhole GVF. The obtained results prove that the adaptation allows an accurate evaluation of the pumped fluid's GVF, thereby circumventing the need for a costly and inaccurate measurement of the two-phase flow gas fraction. Based on this estimation, a control strategy is then proposed to regulate the pump speed while avoiding the resonance frequency of the sucker-rod system.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLow-Dimensional Modeling of a Pumping Unit to Cope With Multiphase Flow
    typeJournal Paper
    journal volume139
    journal issue4
    journal titleJournal of Dynamic Systems, Measurement, and Control
    identifier doi10.1115/1.4035011
    journal fristpage41010
    journal lastpage041010-11
    treeJournal of Dynamic Systems, Measurement, and Control:;2017:;volume( 139 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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