Advances in drilling technology enable oil & gas industry to drill faster and to minimize Non-Productive Time (NPT). This usually requires minimizing changes to the Bottom Hole Assembly (BHA) and improving its reliability. However, drilling systems are commonly subjected to dynamic dysfunctions, that can cause downhole tool failure, increase drilling cost and NPT, and compromise the wellbore quality. Therefore, understanding drilling dynamics behavior of BHA is a crucial step to improve drilling efficiency and to reduce NPT.
Recent advances in drilling and oil & gas extraction have altered the mindset among drilling engineers. One example is the recent trend to drill faster and minimize Non-Productive Time (NPT). This usually requires minimizing changes to the Bottom Hole Assembly (BHA) and improving its reliability. Directional drilling tools such as mud motors and Rotary Steerable Systems (RSS) have become a main stay in minimizing NPT.
Eugenio Oñate, Francisco Zárate, Juan Miquel, Miquel Santasusana, Miguel Angel Celigueta, Ferran Arrufat, Raju Gandikota, Khaydar Valiullin, Lev Ring, A local constitutive model for the discrete element method. Application to geomaterials and concrete, Computational Particle Mechanics Journal, May 2015.
Vadim Tikhonov, Olga Bukashkina and Raju Gandikota, Stick-Slip Model for PDC Bits Accounting for Coupled Torsional and Axial Oscillations, ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis, Volume 2: Dynamics, Vibration and Control; Energy; Fluids Engineering; Micro and Nano Manufacturing, Copenhagen, Denmark, July 25–27, 2014.
Eugenio Oñate, Miquel Santasusana, Miguel A. Celigueta, Ferran Arrufat, Khaydar Valiullin & Raju Gandikota, A parallelized discrete element method for analysis of drill-bit mechanics problems in hard and soft soils, 11th World Congress on Computational Mechanics (WCCM XI). July 2014, Barcelona, Spain.
Mehdi Hajianmaleki, Jeremy S. Daily, The University of Tulsa, Lev Ring & Raju Gandikota, Weatherford, “Buckling Analysis of Drill Strings in Inclined Wellbores Using the Explicit Finite Element Method”, Proceedings of the ASME 2012 International Mechanical Engineering Congress & Exposition, IMECE2012, November 9-15, 2012, Houston, Texas.
Oñate, J.M. Carbonell , C. Labra , F. Zarate, F Arrufat , International Center for Numerical Methods in Engineering (CIMNE) & L. Ring , Raju Gandikota, Weatherford International Inc., “Modeling and simulation of a rotation drilling system with drag bits using coupled discrete and finite element methods”, 10th World Congress on Computational Mechanics (WCCM10), 9-13 July 2012, Sao Paolo , Brazil.
The paper focuses on application of multibody system approach for the torque and drag analysis of long drill strings. The approach is used to get improved results as compared with those obtained by soft-string models. The analysis is carried out by integration of equations of motion of the drill strings till reaching equilibrium under externally applied loads corresponding to conditions of drilling operations.
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