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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) ; Behzad, M ; Rajabi, M ; Sharif University of Technology
Abstract
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...
Development of a Three Layer Model for Simulating Transient Behavior Cutting Transport in Extended-reach Well
, Ph.D. Dissertation Sharif University of Technology ; Behzad, Mehdi (Supervisor)
Abstract
A major concern in directional well drilling is the transport mechanism of cuttings by drilling fluid. This thesis describes the effect of angular velocity and postbuckled vibrations of drillstring on cuttings transport in a directional well drilling. The analysis proceeds in two stages. First, a finite element model is used to predict the dynamic behavior of postbuckled drillstring inside a directional well. Second, a coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) approach to simulate the cuttings transport considering the dynamic collision process. In the combined computational fluid dynamics and discrete element method (CFD-DEM), the fluid phase is treated...
The Simultaneous Effect of Nano Ferric Oxide and a Liquid Additive on Viscosity and Power Transmission of Drilling Cuttings to the Surface on the Water Base Mud Drilling to Optimization of These Properties
, M.Sc. Thesis Sharif University of Technology ; Goodarznia, Iraj (Supervisor) ; Ramazani, Ahmad (Co-Advisor)
Abstract
Transportation of cuttings and efficiency of the hole cleaning has been one of the major concerns of stake holders in the oil and gas industry.This is because a successful drilling program is a key to a productive and profitable oil and gas business. A successful drilling program is as a result of an efficiently cleaned hole. On the other hand, a poor or inefficient hole cleaning implies accumulation of cuttings or formation of cuttings bed in the well. This often leads to decreased rate of penetration, increased cost of drilling, fractured formation, increased plastic viscosity of mud as a result of grinding of cuttings and stuck pipe. Hole cleaning is effected primarily with a drilling...
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) ; Behzad, M ; Rajabi, M ; Sharif University of Technology
Abstract
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...
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) ; Shad, S ; Beagom Mokhtari Hosseini, Z ; Sharif University of Technology
Elsevier B.V
2018
Abstract
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...