Results 11 to 20 of about 1,261 (138)
An efficient model of drillstring dynamics [PDF]
Journal of Sound and Vibration, 2015 This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/10.1016/j.jsv.2015.06.033High amplitude vibration regimes can cause significant damage to oilwell drillstrings: torsional stick-slip oscillation ...
Butlin, T, Langley, RS
core +4 more sources
Contact Dynamics of a Rotary Drillstring System in Elliptical Wellbores
MachinesAs drilling depths continue to increase in oil and gas operations, the associated downhole environment has grown more complex. Data from recent field measurements reveals significant differences between the major and minor axes of the wellbore cross ...
Haiquan Li +5 more
doaj +2 more sources
Avoiding harmful oscillations in a drillstring through dynamical analysis [PDF]
Journal of Sound and Vibration, 2007 Complexity of oilwell drillstrings makes unfeasible the direct application of control methodologies to suppress non-desired oscillations existing in these systems.
Cortés, Domingo, Navarro-López, Eva M.
core +5 more sources
Flow Field and Pressure Loss Characteristics at Rotary Drillstring Joints
Geofluids, Volume 2023, Issue 1, 2023., 2023 A thorough understanding and accurate calculation of the annulus pressure losses are paramount to drilling design and construction. However, due to the influence of the drillstring rotation and the abrupt dimensional variation at the joint, it is difficult to calculate the pressure loss by theoretical analysis in the annulus at the drillstring joints ...
Minghu Nie +6 more
wiley +1 more source
Analysis of the Effect of Whirl on Drillstring Fatigue
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 There are many kinds of vibration forms of drillstring in petroleum drilling. Whirl is one of the main vibration modes when drilling tools are drilling, and it is also the main reason of fatigue failure of the drillstring. In this paper, the causes of drillstring whirl are analyzed.
Chong Wang +5 more
wiley +1 more source
Drillstring Oscillations: The Influence of Fluid Loading and Stabilizer Effects
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 Drillstring vibrations can be undesirable for drilling operations. Here, attention is focused on vibrations of the upper portion of a drillstring as these vibrations can cause drillpipe wear and casing wear. A reduced‐order model is developed to study the motions of a drillstring by taking fluid loading and stabilizer effects into account.
Yongsheng Liu +5 more
wiley +1 more source
Experimental Study on Axial Impact Mitigating Stick‐Slip Vibration with a PDC Bit
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 Stick‐slip vibration reduces the drilling rate of penetration, causes early wear of bits, and threatens the safety of downhole tools. Therefore, it is necessary to study suppression methods of stick‐slip vibration to achieve efficient and safe drilling.
Yong Wang +8 more
wiley +1 more source
Nonlinear Dynamics in Drilling Engineering
, 2021 Shock and Vibration, Volume 2021, Issue 1, 2021.
Qilong Xue +3 more
wiley +1 more source
Reduced basis method for managed pressure drilling based on a model with local nonlinearities
International Journal for Numerical Methods in Engineering, Volume 121, Issue 23, Page 5178-5199, 15 December 2020., 2020 Abstract To circumvent restrictions of conventional drilling methods, such as slow control actions and inability to drill depleted reservoirs, a drilling method called managed pressure drilling (MPD) has been developed. In MPD, single‐phase flow processes can be modeled as a feedback interconnection of a high‐order linear system and a low‐order ...
Mohammad Hossein Abbasi +4 more
wiley +1 more source
Dynamic Model and Quantitative Analysis of Stick‐Slip Vibration in Horizontal Well
Shock and Vibration, Volume 2020, Issue 1, 2020., 2020 Stick‐slip is very harmful to the service life of drillstring. The extended Hamilton principle is applied in the paper. Then, finite element method (FEM) is employed to describe the model. The drillstring‐borehole impact and friction, fluid‐structure interaction, bit‐rock interaction, and gravity are considered in this model. The influence of axial and
Baojin Wang +3 more
wiley +1 more source