Search for: oil-well-drilling-equipment
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    Dynamic modeling and performance evaluation of a vibrating beam microgyroscope under general support motion

    , Article Journal of Sound and Vibration ; Volume 301, Issue 1-2 , 2007 , Pages 146-164 ; 0022460X (ISSN) Esmaeili, M ; Jalili, N ; Durali, M ; Sharif University of Technology
    Academic Press  2007
    A general modeling framework is presented for the development of the frequency equation of a microgyroscope, which is modeled as a suspended cantilever beam with a tip mass under general base excitation. Specifically, the beam is considered to vibrate in all the three directions, while subjected to a base rotational motion around its longitudinal direction. This is a common configuration utilized in many vibrating beam gyroscopes and well drilling systems. The governing equations are derived by using the Extended Hamilton's Principle with a general 6-dof base motion. The natural frequency equation is then extracted in a closed-form for the case where the beam support undergoes longitudinal... 

    Feasibility of using laser bit beside of common bits to drilling slim holes

    , Article Society of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand ; Volume 1 , 2013 , Pages 422-433 ; 9781627481762 (ISBN) Bazargan, M ; Jalalyfar, H ; Koohian, A ; Habibpour, M ; Sharif University of Technology
    The capability level of rotary as well as first generation drilling operation could not be matched for deeply drilling programs. To reach that deep, the increasing in drill string length could also cause an additional constraint on hydraulic performance. The operation of slim hole drilling has significant potential to reduce well costs. This cost might be savings are especially important with increased demand for reduced capital finance under current economic conditions in the Iranian oil and gas industry. This savings achievement could be caused by use of smaller drilling rigs, work over rigs, reduced casing size, reducing requirement for drilling consumables and other costs associated with... 

    CFD-DEM approach to investigate the effect of drill pipe rotation on cuttings transport behavior

    , Article Journal of Petroleum Science and Engineering ; Volume 127 , 2015 , Pages 229-244 ; 09204105 (ISSN) Akhshik, S ; Behzad, M ; Rajabi, M ; Sharif University of Technology
    Increasing cuttings bed height is a serious concern during extended-reach well drilling. In order to predict and prevent cuttings bed height increase, it is essential to study how the critical parameters influence the cuttings transport, especially the drill pipe rotation effects on the cuttings transport process. In conventional models for cuttings transport, the dynamic behavior of particles due to drill pipe rotation is neglected or empirically simplified. This paper presents a coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) approach to simulate the cuttings transport considering the dynamic collision process. The fluid phase is treated as an Eulerian continuum... 

    Integrated image processing and computational techniques to characterize formation damage

    , Article SPE International Conference and Exhibition on Formation Damage Control 2018, 7 February 2018 through 9 February 2018 ; Volume 2018-February , 2018 Ezeakacha, C. P ; Rabbani, A ; Salehi, S ; Ghalambor, A ; Sharif University of Technology
    Society of Petroleum Engineers (SPE)  2018
    Filtrate and solid invasion from drilling fluids are two key sources of formation damage, and can result in formation permeability impairment. Typically, spurt invasion of mud solids causes the evolution of an external mud cake which tends to reduce further solids and filtrate influx. However, uncontrolled spurt and filtrate invasion are detrimental because they reduce the permeability of the formation. Mud composition, formation rock's permeability and porosity, and temperature can influence both spurt and filtrate invasion. The sizes of mud solids relative to the average pore size of a rock are also important in predicting the extent of mud invasion and permeability impairment. In this... 

    Fretting fatigue behavior of 316L stainless steel under combined loading conditions

    , Article International Journal of Fatigue ; Volume 128 , 2019 ; 01421123 (ISSN) Farrahi, G. H ; Minaii, K ; Bahai, H ; Sharif University of Technology
    Elsevier Ltd  2019
    Fretting fatigue occurs in engineering applications where two interacting surfaces are subjected to fluctuating forces. The fluctuating forces occasionally act as a combined loading condition. The present paper investigates fretting fatigue behaviour of 316L stainless steel under such combined (i.e. tensile and bending) loading conditions. A new fixture was developed in order to apply bending and tensile loads simultaneously. Using this fixture, the effect of different bending-to-tension ratios was investigated. The results showed that increasing the contribution of bending load improves fretting fatigue life. On the other hand, increasing grain size decreases fretting fatigue life.... 

    Block shear failure in welded gusset plates under combined loading

    , Article Journal of Constructional Steel Research ; Volume 170 , July , 2020 Maleki, S ; Ghaderi Garekani, M ; Sharif University of Technology
    Elsevier Ltd  2020
    Block shear failure in the base metal of welded steel connections is a potential failure mode affecting many steel structures. However, there are only a few studies on the block shear failure of welded connections under combined shear and axial loading. Combined loading is defined as a simultaneous loading parallel and perpendicular to the weld lines (or an inclined loading) in the plane of the connecting plate. In this research, a nonlinear finite element model is used to study the effect of connection geometry and weld group configuration on the block shear strength of welded connections under combined loading. In current design standards, the block shear failure planes are assumed to... 

    CFD-DEM simulation of the hole cleaning process in a deviated well drilling: the effects of particle shape

    , Article Particuology ; Volume 25 , 2016 , Pages 72-82 ; 16742001 (ISSN) Akhshik, S ; Behzad, M ; Rajabi, M ; Sharif University of Technology
    We investigate the effect of particle shape on the transportation mechanism in well-drilling using a three-dimensional model that couples computational fluid dynamics (CFD) with the discrete element method (DEM). This numerical method allows us to incorporate the fluid-particle interactions (drag force, contact force, Saffman lift force, Magnus lift force, buoyancy force) using momentum exchange and the non-Newtonian behavior of the fluid. The interactions of particle-particle, particle-wall, and particle-drill pipe are taken into account with the Hertz-Mindlin model. We compare the transport of spheres with non-spherical particles (non-smooth sphere, disc, and cubic) constructed via the... 

    A review on impacts of drilling mud disposal on environment and underground water resources in south of Iran

    , Article Proceedings of the SPE/IADC Middle East Drilling Technology Conference and Exhibition, 26 October 2009 through 28 October 2009 ; 2009 , Pages 447-454 ; 9781615677450 (ISBN) Bakhshian, S ; Dashtian, H ; Paiaman Mirzai, A ; Al Anazi, B. D ; Sharif University of Technology
    In drilling oil wells a system of complex fluids and chemical additives is used. Losses of these fluids in the well during drilling or disposal of them in well site could transfer pollutants to groundwater. In the present study a number of well sites, located in South of Iran, were studied to indicate types and magnitude of various pollutant materials that remain in the environment undestroyed and have considerable impacts on the underground water resources. Hydrocarbons used in Oil Base Muds (OBM) that can't be biodegrade readily in nature found to be the most severe pollutant material caused by disposal of Drilling Mud and Cuttings. Volume of drilling waste for these oil wells evaluated to... 

    Modeling and simulation of barite deposition in an annulus space of a well using CFD

    , Article Journal of Petroleum Science and Engineering ; Volume 161 , 2018 , Pages 476-496 ; 09204105 (ISSN) Movahedi, H ; Shad, S ; Beagom Mokhtari Hosseini, Z ; Sharif University of Technology
    Elsevier B.V  2018
    In drilling industry, barite particles settling and barite sag as a major problem can potentially impose significant operational issues. Static conditions, in which well undergoes an extended shut-in period, could occur during different drilling and completion operations such fishing operation, tripping, and logging. Despite its importance, such phenomenon is not well understood yet. To avoid issues related to barite settlement and barite sag, a good understanding of the impact of different drilling parameters on barite settlement and sag phenomenon is required. Recently, the mathematical formulation and modeling of settlement and sag processes have gained more attention. In order to better...