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    Analytical Modelling and Simulation of Drilling Lost-Circulation in Naturally Fractured Formation

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    Rami_Albattat_PhD-Dissertation.pdf
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    Description:
    PhD Dissertation
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    Type
    Dissertation
    Authors
    Albattat, Rami cc
    Advisors
    Hoteit, Hussein cc
    Committee members
    Patzek, Tadeusz cc
    Sun, Shuyu cc
    Yotov, Ivan
    Program
    Energy Resources and Petroleum Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2022-04
    Permanent link to this record
    http://hdl.handle.net/10754/676328
    
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    Abstract
    Drilling is crucial to many industries, including hydrocarbon extraction, CO2 sequestration, geothermal energy, and others. During penetrating the subsurface rocks, drilling fluid (mud) is used for drilling bit cooling, lubrication, removing rock cuttings, and providing wellbore mechanical stability. Significant mud loss from the wellbore into the surrounding formation causes fluid lost-circulation incidents. This phenomenon leads to cost overrun, environmental pollution, delays project time and causes safety issues. Although lost-circulation exacerbates wellbore conditions, prediction of the characteristics of subsurface formations can be obtained. Generally, four formation types cause lost-circulation: natural fractures, and induced fractures, vugs and caves, and porous/permeable medium. The focus in this work is on naturally fractured formations, which is the most common cause of lost circulation. In this work, a novel prediction tool is developed based on analytical solutions and type-curves (TC). Type-curves are derived from the Cauchy equation of motion and mass conservation for non-Newtonian fluid model, corresponding to Herschel-Bulkley model (HB). Experimental setup from literature mimicking a deformed fracture supports the establishment of the tool. Upscaling the model of a natural fracture at subsurface conditions is implemented into the equations to achieve a group of mud type-curves (MTC) alongside another set of derivative-based mud type-curves (DMTC). The developed approach is verified with numerical simulations. Further, verification is performed with other analytical solutions. This proposed tool serves various functionalities; It predicts the volume loss as a function of time, based on wellbore operating conditions. The time-dependent fluid loss penetration from the wellbore into the surrounding formation can be computed. Additionally, the hydraulic aperture of the fracture in the surrounding formation can be estimated. Due to the non-Newtonian behavior of the drilling mud, the tool can be used to assess the fluid loss stopping time. Validation of the tool is performed by using actual field datasets and published experimental measurements. Machine-Learning is finally investigated as a complementary approach to determine the flow behavior of mud loss and the corresponding fracture properties.
    Citation
    Albattat, R. (2022). Analytical Modelling and Simulation of Drilling Lost-Circulation in Naturally Fractured Formation. KAUST Research Repository. https://doi.org/10.25781/KAUST-KRBT2
    DOI
    10.25781/KAUST-KRBT2
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-KRBT2
    Scopus Count
    Collections
    Energy Resources and Petroleum Engineering Program; PhD Dissertations; Physical Science and Engineering (PSE) Division

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