Drillstring torsional vibrations: Comparison between theory and experiment on a full-scale research drilling rig
Conference
·
OSTI ID:7199661
This paper presents a mathematical method for the computation of torsional resonance frequencies in a drillstring. The torsional resonance frequencies in a drillstring are readily calculated from the nominal drillstring dimensions. A high degree of accuracy is achieved when a correction factor to the torsional propagation velocity in drillpipe due to the offsets at the drillpipe joints is incorporated into the calculations. The theory and computer program were tested against data recorded in a 1000m deep, nearly vertical well. Torsional spectra were recorded with the bit off bottom at 450m, 550m, and 1000m and while drilling. Well defined torsional resonances were observed for frequencies up to 40 HZ. The calculated resonance frequencies are in very good agreement with all experimental data.
- Research Organization:
- Rogaland Research Inst.
- OSTI ID:
- 7199661
- Report Number(s):
- CONF-861080-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
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& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
ACCURACY
COMPARATIVE EVALUATIONS
COMPUTER CALCULATIONS
COMPUTER CODES
DEPTH
DIMENSIONS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING RIGS
EQUIPMENT
FREQUENCY DEPENDENCE
FREQUENCY RANGE
HZ RANGE
JOINTS
MECHANICAL VIBRATIONS
NATURAL GAS WELLS
OIL WELLS
PIPE JOINTS
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RESONANCE
TORSION
WELL DRILLING
WELL LOGGING
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020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
ACCURACY
COMPARATIVE EVALUATIONS
COMPUTER CALCULATIONS
COMPUTER CODES
DEPTH
DIMENSIONS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING RIGS
EQUIPMENT
FREQUENCY DEPENDENCE
FREQUENCY RANGE
HZ RANGE
JOINTS
MECHANICAL VIBRATIONS
NATURAL GAS WELLS
OIL WELLS
PIPE JOINTS
PIPES
RESONANCE
TORSION
WELL DRILLING
WELL LOGGING
WELLS