Effect of process damping on longitudinal vibrations in drillstrings
- Univ. of Southwestern Louisiana, Lafayette, LA (United States). Mechanical Engineering Dept.
This paper shows the effect of process damping -- caused by the interference between the cutter and the previously cut surface -- on the stability of drillstrings. The method of including process damping in the calculation of the stability diagram is outlined. Previously published stability diagrams of drillstrings equipped with drag bits showed decreased stability of low cutting speeds, and that the addition of a shock absorber decreased the size of stability pockets. In this paper, the authors show that the introduction of process damping confirms field observations of increased stability at low speeds. They also shows that a properly designed shock absorber produces large stability pockets where drilling is most effective.
- OSTI ID:
- 7147074
- Journal Information:
- Journal of Energy Resources Technology; (United States), Journal Name: Journal of Energy Resources Technology; (United States) Vol. 116:2; ISSN 0195-0738; ISSN JERTD2
- Country of Publication:
- United States
- Language:
- English
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