Results 221 to 230 of about 15,062 (254)

Bit Whirl: A New Theory of PDC Bit Failure

Proceedings of SPE Annual Technical Conference and Exhibition, 1989
ABSTRACT This paper presents the results of a study investigating PDC bit vibrations. The study shows that the most harmful vibrations can be attributed to a phenomena called "bit whirl". During whirl the instantaneous center of rotation moves around the face of the bit, and the bit backwards whirls around the hole. Cutters on a whirling
J. F. Brett, T. M. Warren, S. M. Behr
openaire   +1 more source

Bit Wobble: A Kinetic Interpretation of PDC Bit Failure

Proceedings of SPE Annual Technical Conference and Exhibition, 1994
ABSTRACT Considering the configuration of bottom hole assembly (BHA), rock properties, effect of BHA rotation, and fluid damping, this paper presents a kinetic model for vibration analysis of drilling bits in vertical holes. Based on this model, it is demonstrated that drill bits undergo wobbling motion in drilling conditions. This model
Boyun Guo, Geir Hareland
openaire   +1 more source

Bit Whirl—A New Theory of PDC Bit Failure

SPE Drilling Engineering, 1990
Summary This paper presents the results of a study showing that the most harmful polycrystalline-diamond-compact (PDC) bit vibrations can be attributed to a phenomenon called "bit whirl." During whirl, the instantaneous center of rotation moves around the face of the bit, and the bit whirls backward around the hole. Cutters on a whirling
J. Ford Brett, Thomas M. Warron, Suzanne M. Bohr   +2 more
openaire   +1 more source

Advanced Coating to Mitigate PDC Cutter Thermal Degradation in PDC Bit Manufacturing

International Petroleum Technology Conference, 2022
Abstract Polycrystalline Diamond Compact (PDC) cutters on PDC drill bits are the primary cutting elements to shear and scrape the formations during drilling process. In the PDC drill bit manufacturing, PDC cutters are attached onto drill bit with silver-copper-zinc alloys by brazing process.
Jianhui Xu, Guodong David Zhan, Timothy E. Moellendick, Wenhui Jiang   +3 more
openaire   +1 more source

Development of Whirl Resistant PDC Bits

Proceedings of SPE Latin America/Caribbean Petroleum Engineering Conference, 1994
ABSTRACT The destructive effects of the dynamic forces typically induced by bit whirl have beert identified in previous works. The material presented deals with innovative design features recently developed for PDC bits which resist initiation and propagation of bit whirl.
R. I. Clayton, B. S. Ivie
openaire   +2 more sources

Dynamic Drilling Strategy for PDC Bits

Proceedings of SPE/IADC Drilling Conference, 1987
ABSTRACT A new mechanistic drilling model for PDC bits was presented. The model was fully explicit with physical meanings given for all constants and functions. The response of the drilling model to weight-on-bit and cutters removal and the stability of constants were tested using some field and laboratory data.
A. K. Wojtanowicz, E. Kuru
openaire   +1 more source

Steel-Body PDC-Bit Technology Improves Bit Performance

Journal of Petroleum Technology, 1998
This article is a synopsis of paper SPE 47815, "Steel-Body-PDC-Bit Technology Demonstrates Performance Improvements," by L.M. Smith, SPE, Security DBS; V.P. Perrin, SPE, Chevron Petroleum Technology; and R. Delwiche, SPE, Security DBS, originally presented at the 1998 IADC/SPE Asia Pacific Drilling Technology, Jakarta, 7-9 September.
openaire   +1 more source

Laboratory Drilling Performance of PDC Bits

SPE Drilling Engineering, 1988
Summary A laboratory study of polycrystalline diamond compact (PDC) bit designs has generated data that give an insight into PDC-bit performance in the field. The tests reviewed in this paper include those for rate of penetration (ROP), torque response, hydraulic energy sensitivity, balling tendency, dull-bit performance, and bit ...
T. M. Warren, W. K. Armagost
openaire   +1 more source

PDC Bit Classification According to Steerability

SPE Drilling & Completion, 2004
SummaryWith the emergence of rotary steerable systems (RSSs), the technical issue concerning bit design for a specific directional application has reappeared. Today, a bit must be specifically designed for use with a particular directional system: rotary bottomhole assembly (BHA), steerable mud motor, or RSS.
Menand, Stephane, Sellami, Hedi, Simon, C.   +2 more
openaire   +1 more source

Three-Dimensional Modeling of PDC Bits

SPE/IADC Drilling Conference, 1991
ABSTRACT PDC bit modeling has historically incorporated the assumption that cutter forces are constant for a full revolution of the bit. This assumption places considerable limitations on the model's ability to simulate drilling in nonhomogeneous rock and in cases where the bit whirls.
S. M. Behr, T. M. Warren, L. A. Sinor, J. F. Brett   +3 more
openaire   +1 more source