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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 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...