Results 151 to 160 of about 4,548 (230)
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Journal of Petroleum Science and Engineering, 2022
Practice has proved that drag reduction oscillators can be used to decrease the axial friction and increase wellbore extension effectively in sliding drilling.
Xiaolei Shi +3 more
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Practice has proved that drag reduction oscillators can be used to decrease the axial friction and increase wellbore extension effectively in sliding drilling.
Xiaolei Shi +3 more
semanticscholar +1 more source
Failure analysis of drillstrings
Engineering Failure Analysis, 2007Abstract The cost of drilling a well is measured in tens of millions of dollars. The incidence of downhole failure of the drillstring can increase this figure dramatically. The focus placed on cost reduction in the early 1990’s – when the oil price was much lower than today’s levels – resulted in some scrutiny of drilling operations, amongst other ...
K.A. Macdonald, J.V. Bjune
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SPE Journal, 2022
In this paper, based on the dynamic model of the geometrically exact drillstring in horizontal well, a nonlinear dynamic model of drillstring-bit-rock coupling system is established. First, the contact model of drillstring and borehole wall in vertical
Yiwei Han +3 more
semanticscholar +1 more source
In this paper, based on the dynamic model of the geometrically exact drillstring in horizontal well, a nonlinear dynamic model of drillstring-bit-rock coupling system is established. First, the contact model of drillstring and borehole wall in vertical
Yiwei Han +3 more
semanticscholar +1 more source
Drillstring Vibrations and Wellbore Quality: Where Drillstring Design Meets Geomechanics
Abu Dhabi International Petroleum Exhibition & Conference, 2018Abstract 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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Methodology Prevents Drillstring Fatigue and Failure in Deep Well With Large Shallow Dogleg
Journal of Petroleum TechnologyThis article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 23191, “Methodology for Preventing Drillstring Fatigue and Failure in a Deep Well With Large Shallow Dogleg,” by Jiawei Zhang, Hongchun Huang, and ...
C. Carpenter
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SPE Annual Technical Conference and Exhibition
Torsional vibration, commonly referred to as ‘stick-slip’ is one of the most common modes of drillstring vibration, often driving lateral and axial shocks as the BHA accelerates in the ‘slip’ phase.
D. Forrest +8 more
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Torsional vibration, commonly referred to as ‘stick-slip’ is one of the most common modes of drillstring vibration, often driving lateral and axial shocks as the BHA accelerates in the ‘slip’ phase.
D. Forrest +8 more
semanticscholar +1 more source
, 2021
As drilling sections become deeper and longer, transferring more weight downhole to improve rate of penetration is the primary concern for the operator. Drillstring dynamics and buckling are some primary limiters for drilling efficiency.
Wei Chen +4 more
semanticscholar +1 more source
As drilling sections become deeper and longer, transferring more weight downhole to improve rate of penetration is the primary concern for the operator. Drillstring dynamics and buckling are some primary limiters for drilling efficiency.
Wei Chen +4 more
semanticscholar +1 more source
Stability analysis of drillstring rotation
Dynamics and Stability of Systems, 1995The 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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Axial Load Peristaltic Transfer Mechanism of the Drillstring to Improve Penetration Rate
SPE JournalDuring the drilling of long horizontal wells, the significant frictional resistance generated by the wellbore walls poses a challenge for the drillstring to efficiently transmit load to the drill bit, which eventually reduces drilling efficiency and ...
Peng Wang +5 more
semanticscholar +1 more source
SPE Journal
In the research field of drillstring mechanics, there are two main problems: First, the upper boundary conditions of the lower drillstring model are not accurate enough, and second, the computational efficiency of the full-well drillstring model is low.
Yang Bo +3 more
semanticscholar +1 more source
In the research field of drillstring mechanics, there are two main problems: First, the upper boundary conditions of the lower drillstring model are not accurate enough, and second, the computational efficiency of the full-well drillstring model is low.
Yang Bo +3 more
semanticscholar +1 more source