Case studies of the bending vibration and whirling motion of drill collars
- Taiwan National Ocean Univ. (TW)
- Massachusetts Inst. of Technology, Cambridge, MA (US)
- Shell Development Co. (US)
This paper describes two principal sources of bottomhole-assembly (BHA) bending vibration: drill-collar whirling and linear coupling between weight-on-bit (WOB) fluctuations and bending vibration of an initially curved BHA. It also evaluates the consequences of bending vibration in terms of drill-collar wear and connection fatigue. Equations are given for forward and backward whirl rate and for tangential velocity at the borehole wall. Downhole measurements of bending moment are used to detect and to identify bending-vibration events, and data taken with a downhole vibration-measurement system are sued to illustrate cases of linearly coupled bending vibration, forward and backward whirl, and bit bounce.
- OSTI ID:
- 5820397
- Journal Information:
- SPE (Society of Petroleum Engineers) Drilling Engineering; (USA), Journal Name: SPE (Society of Petroleum Engineers) Drilling Engineering; (USA) Vol. 5:4; ISSN 0885-9744; ISSN SDENE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BENDING
DATA ANALYSIS
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FATIGUE
MECHANICAL PROPERTIES
MECHANICAL VIBRATIONS
NATURAL GAS WELLS
OIL WELLS
ROCK DRILLING
SLEEVES
WEAR
WELLS