TY - JOUR
T1 - Avoiding harmful oscillations in a drillstring through dynamical analysis
AU - Navarro-López, Eva M.
AU - Cortés, Domingo
N1 - Funding Information:
The authors gratefully acknowledge the valuable discussions and support received by Professor Rodolfo Suárez Cortez in developing the first ideas of this work. They are also gratetul to Julien Cabillic (Institut Français de Mécanique Avancée) who revised the drillstring mechanical model. This paper has been partially done in the context of LAFMAA project “VIBSARTAS” under CONACYT grant and under Ramón y Cajal contract under the support of the Ministerio de Educación y Ciencia (MEC) of Spain.
PY - 2007/10/23
Y1 - 2007/10/23
N2 - Complexity of oilwell drillstrings makes unfeasible the direct application of control methodologies to suppress non-desired oscillations existing in these systems. A reasonable alternative is to develop operation recommendations and parameter selection methods to guide the driller to avoid such oscillations. In this paper, by using dynamical analysis tools, operation recommendations and the detection of safe drilling parameters in a conventional oilwell drillstring are presented. To this end, a more generic lumped-parameter model than those considered until now is proposed. Particularly, this model takes into account the fact that the drillstring length increases as drilling operation makes progress. The analysis of a sliding motion giving rise to self-excited bit stick-slip oscillations and bit sticking phenomena at the bottom-hole assembly is performed. Finally, the identification of key drilling parameters ranges for which non-desired torsional oscillations are present is carried out by studying Hopf bifurcations in the vicinity of the system equilibrium point when rotary velocities are greater than zero.
AB - Complexity of oilwell drillstrings makes unfeasible the direct application of control methodologies to suppress non-desired oscillations existing in these systems. A reasonable alternative is to develop operation recommendations and parameter selection methods to guide the driller to avoid such oscillations. In this paper, by using dynamical analysis tools, operation recommendations and the detection of safe drilling parameters in a conventional oilwell drillstring are presented. To this end, a more generic lumped-parameter model than those considered until now is proposed. Particularly, this model takes into account the fact that the drillstring length increases as drilling operation makes progress. The analysis of a sliding motion giving rise to self-excited bit stick-slip oscillations and bit sticking phenomena at the bottom-hole assembly is performed. Finally, the identification of key drilling parameters ranges for which non-desired torsional oscillations are present is carried out by studying Hopf bifurcations in the vicinity of the system equilibrium point when rotary velocities are greater than zero.
UR - http://www.scopus.com/inward/record.url?scp=34548317243&partnerID=8YFLogxK
U2 - 10.1016/j.jsv.2007.06.037
DO - 10.1016/j.jsv.2007.06.037
M3 - Artículo
SN - 0022-460X
VL - 307
SP - 152
EP - 171
JO - Journal of Sound and Vibration
JF - Journal of Sound and Vibration
IS - 1-2
ER -