Results 131 to 140 of about 1,256 (185)

Drillstring Network 2.0: An Enhanced Drillstring Network Based on 100 Wells of Experience

SPE Annual Technical Conference and Exhibition, 2014
Abstract Wired drill pipe (WDP) has been used in more than 100 wells worldwide to create a drillstring network that provides high bandwidth communications between the surface and tools deployed in the wellbore. This network operates independently of drilling fluid, enabling communications for the widest range of drilling applications ...
Andrew Craig, Rhys Adsit
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Drillstring Vibrations and Wellbore Quality: Where Drillstring Design Meets Geomechanics

Abu Dhabi International Petroleum Exhibition & Conference, 2018
Abstract Wellbore quality might not always be the top priority from a drilling perspective due to the misconception that quality comes at the expense of drilling efficiency. This is indeed a misconception since a compromised wellbore quality, which can be defined as non-uniform wellbore shape due to the presence of enlargements and tight
Hussain AlBahrani, Abdullah Al-Yami
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Stability analysis of drillstring rotation

Dynamics and Stability of Systems, 1995
The stability of oilwell drillstring rotation is analyzed. The drillpipe is represented by a one-dimensional continuum in torsion, while the bottom-hole-assembly is considered to be a rigid body.
V.A. Palmov, E Brommundt, A.K. Belyaev
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Elimination of Drillstring Failures

Journal of Petroleum Technology, 1994
Drillstring failures can be prevented by drilling a straight, useful hole free of severe doglegs with larger-than-normal drillstring components. The maximum drill-collar diameters shown in the Lubinski tables in the IADC Drilling Manual, Sec. P1,1 for straight-hole drilling are essential for drilling a straight, useful hole and preventing drillstring ...
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Drillstring Fatigue Performance

SPE Drilling Engineering, 1990
Summary The life-prediction technique of a whole-life fatigue model was applied to drillstring components. Good agreement existed between the life predictions and the experimental data of drill collars. These life predictions were then used to study the effects of material properties and commonly used thread profiles on the fatigue life ...
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Directional Drillstring Dynamics

2008
A rotating rod under load may execute vibration in different ways: transversal (bending), longitudinal (axial), torsional, or a combination of any of those. In this article, the dynamics of a rotating directional drilling system, constrained to rotate in a borehole, is investigated using the finite element formulation.
Fredy Coral Alamo, Hans Ingo Weber, Harry Saavedra Espinoza   +2 more
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An Overview of Drillstring Models

2015
Over the last half-century, extensive research effort has been conducted to mathematically describe the physical phenomena occurring in real wells. This chapter presents a brief compilation of the most popular modeling strategies allowing the analysis and control of a vertical oilwell drilling system.
Martha Belem Saldivar Márquez, Islam Boussaada, Hugues Mounier, Silviu-Iulian Niculescu   +3 more
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Self-Excited Vibrations in Drillstrings

SPE Annual Technical Conference and Exhibition, 1987
Abstract Vibrations created by drag bits can cause premature failure of drillstring components and fracture cutters. Unfortunately, there has been no theory that adequately explains how drag bits excite drillstrings. Our paper shows that these vibrations are self excited by the interaction of drillstring, bit, and formation. Results show
C. A. Zamudio, J. L. Tlusty, D. W. Dareing   +2 more
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Stability of the equilibrium of rotating drillstrings

International Applied Mechanics, 2006
The quasistatic stability of a rotating drillstring under longitudinal force and torque is analyzed. Constitutive equations are derived, and a technique to solve them is proposed. It is shown that the buckling mode of the drillstring is helical within a section subjected to compressive ...
V. I. Gulyaev, P. Z. Lugovoi, M. A. Belova, I. L. Solov’ev   +3 more
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Stress Analysis of Drillstrings

University of Tulsa Centennial Petroleum Engineering Symposium, 1994
Abstract Drillstring stress analysis techniques are reviewed with emphasis on the use of torque-drag formulations. Some of the many modifications to torque-drag calculations are reviewed and discussed. The limitations of current results in drillstring dynamics for use in stress analysis calculations are also discussed.
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