Stability of drillstrings equipped with PDC bits depends on many factors such as the design of the drillstring, design of the bit, and formation type. In this paper, we show that the drill pipe plays a minor role in stability in comparison with that of the drill collars. We also show that the number of bit blades affects the location of the stability pockets, while their spacing affects the size of these pockets. Using this data, a combination of drill collar and bit design can be used to provide operating speeds resulting in maximum stability of the drillstring.
Issue Section:
Technical Papers
1.
Brett, J., Warren, T., and Behr, S., 1990, “Bit Whirl: A New Theory of PDC Bit Failure,” SPE Drilling Engineering, pp. 275–281.
2.
Clayton, R., and Ivie, B., 1994, “Development of Whirl Resistant PDC Bits,” SPE Paper 26954, Petroleum Engineering Conference, Buenos Aires, Argentina.
3.
Dareing
D.
Tlusty
J.
Zamudio
C.
1990
, “Self-Excited Vibrations Induced by Drag Bits
,” ASME JOURNAL OF ENERGY RESOURCES TECHNOLOGY
, Vol. 112
, pp. 54
–61
.4.
Dareing, D., and Livesay, B., 1968, “Longitudinal and Angular Drillstring Vibrations with damping,” Journal Energy Research Technology, Nov., pp. 671–679.
5.
Dvorak, D., 1995, “Coupling of Longitudinal and Lateral Vibrations in Drill-strings,” a report, University of Florida.
6.
Elsayed
M. A.
Wells
R. L.
Dareing
D. W.
Nagirimadugu
K.
1994
, “Effect of Process Damping on Longitudinal Vibrations in Drillstrings
,” ASME JOURNAL OF ENERGY RESOURCES TECHNOLOGY
, Vol. 116
, pp. 129
–135
.7.
Elsayed
M. A.
Dareing
D. W.
1994
, “Coupling of Longitudinal and Torsional Vibrations in a Single-Mass Model of a Drillstring
,” Developments in Theoretical and Applied Mechanics
, Vol. XVII
, Univ. of Arkansas, Fayetteville, AR, pp. 128
–139
.8.
Elsayed
M. A.
Dareing
D. W.
Vonderheide
M.
1997
, “Effect of Torsion on Stability, Dynamic Forces and Vibration Characteristics in Drillstrings
,” ASME JOURNAL OF ENERGY RESOURCES TECHNOLOGY
, Vol. 119
, Mar., pp. 11
–19
.9.
Mensa-Wilmot G., and Alexander, W., 1995, “New PDC Bit Design Reduces Vibrations Problems,” Oil and Gas Journal, May, pp. 57–59.
10.
Tlusty, J., and Polacek, M., 1963, “The Stability of the Machine Tool Against Self-Excited Vibrations in Machining,” ASME Production Engineering Research Conference, Pittsburgh, PA.
11.
Tlusty, J., Dareing, D., and Zamudio, C., 1988, “Progress Report No. 1, Vibrations of Drag Bits,” MLI Manufacturing Lab., Gainsville, Fl.
12.
Zamudio, C. A., Tlusty, and J. L., Dareing, D. W., 1987, “Self-Excited Vibrations in Drillstrings,” SPE Paper 16661, 62nd Annual Conference, Dallas, TX., pp. 117–123.
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