Experimental study on the model of the correlation between the movement of the drilling string with big diameter of drill and effects on the oil rigs

Abstract

Drilling rigs are equipped with a modern hoisting system, for movement of the long string, by means of topdrive with all functions involved which is used to carry out special up and down functions. A great importance in the dynamic study of a working system operation is given to the way in which the system structure is set. A first concern in this regard was to set the structure of the working system and exploitations for displacements and vibrations as a continuous system. It is considered a drill pipe with realistic features. The article discovers some issues, develop mathematical model for the study of dynamic drilling string and study on the effects on the structure of mechanical wave propagation in drilling string. It interacts with structural friction, viscous and dry, between borehole and drill pipe in the paper we find the models of interaction for everyone in part. The Hoisting system model developed in the laboratory is reduced by the similarity of the installation for drilling large-diameter wells. Theoretical results are obtained by numerical simulation modeling. The validation is done indirectly by tracing the evolution pressures graphics as a result of displacement of the lower end of the drilling string model. During experimental research has found that it has important effect moving the upper (topdrive) and the mechanical stresses and displacements of the structure of the model.

Improving the Cuttings Transport Performance of Water-based Mud Through the Use of Polypropylene Beads

“…However, previous researchers have done great works in unravelling the rationale behind the factors that affect the cuttings carrying capacity of drilling fluids. Parameters such as annular flow rate, rate of penetration, fluid density, effective fluid viscosity, cuttings size, cuttings density, well inclination and pipe/hole eccentricity play leading roles in cuttings transport performance of drilling fluid (Ozbayoglu et al 2004;Stan & Avram 2014). In the same vein, other factors such as fluid flow regime and pipe rotation have also been observed to have a great impact on drilled cuttings transport in vertical, deviated, and horizontal wellbores Ozbayoglu et al 2008;Rooki et al 2014;Tomren et al 1986).…”