Horizontal wellbore profile and trajectory optimization without hole problems are considered the most essential part in well planning and design. In this paper, a long radius horizontal well was trajectory optimized by selecting horizontal profile, kick off point (KOP), horizontal turn trajectory, vertical turn determination, and mud weights. After that, in order to design 3D profile, the Minimum Curvature Method (MCM)was used for survey determination. Moreover, the best well orientation was selected based on rock mechanics and wellbore stability so that the optimum trajectory could be drilled without instability problems. Real horizontal well passed through 5 targets: NRQ 255 6H-1, NRQ 255 6H-2, NRQ 255 6H-3, NRQ 255 6H-4, and NRQ 255 6H-5 are studied. The planned trajectory has found the same as real trajectory until 9 5/8" casing is landed to true vertical depth (TVD) =7230 ft. and measured depth (MD) =7343.6 ft. However, during drilling 8.5'' hole, it was impossible to continue drilling due to the drillstring being stuck because of caved shale and hole pack off. Wellbore trajectory was redesigned and selected after building new wellbore stability and geomechanical stress models using logging while drilling (LWD) data. A 6'' sidetrack hole was successfully drilled and hit the five targets horizontally.

This paper depicts certain thermodynamic processes possibly involved in the oil industry specific activities operation and/or proper equipment maintenance. On this basis we present a series of courses of action in performing processes like oil storage and transportation, aiming the thermal energy consumption reduction.

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.

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