Effect of fluid forces on drill string mechanics

Abstract

In the present situation of rig operations, the procedure of drill string design is crucial for the successful enlargement of any kind project. Besides of a pipe reliable material, the hoisting system of the rig must be prepared both for pulling out and moderating the velocity of tripping in. Therefore, the term Hook Load is introduced to evaluate the axial forces experienced by the drill string. This expression will be approached carefully through this work, since it still brings some uncertainty within drilling operations and it should be evaluated through an indirect method of measurement. This circumstance denotes one of the principal incentives of this master thesis, which aims to improve the Hook Load measurement and calculation, performing a better understanding of the forces exerted by fluids in drill pipes, quantifying the effect and running sensitivity analysis. The partnership of the company involved in this project allowed to achieve fruitfully the objectives planned. Each step of modelling will be accurately supported by physical and mathematical models giving through WellPlan simulator. Classic and modern approaches of the fluid forces studies will be developed in this master thesis, analysing them individually also as a group, because it is vital to know the effect of each downhole parameter to make efficient and innocuous choices into the oil well drilling.