Whirl (drilling) - Drilling & Well Completion - tidjma.tn
Whirl is a detrimental condition that can significantly impact drilling operations, leading to costly delays, equipment damage, and potential wellbore instability. Understanding the causes and consequences of whirl, and implementing preventive measures, is essential for maintaining efficient and safe drilling operations.
Analysis of the Influence of Downhole Drill String Vibration on ...
Jul 22, 2023 · The results show that the reverse whirl of BHA is greatly affected by the speed and axial force, and adjusting the ground speed and large hook load can weaken the reverse whirl of BHA, thereby improving the stability of the wellbore.
Influence of torsional stick-slip vibration on whirl behavior in drill ...
Aug 1, 2023 · The analysis showed that the rotation speed, friction coefficient, WOB, and clearance between the drill string and the wellbore all affected the whirl of vertical wells.
Nonlinear rub-impact characteristics of drillstring-wellbore and …
When the driving speed is 80 rev/min, the lateral motion trajectory of the drill string fills the entire wellbore, and the lateral vibration state of the drill string is disordered and nonlinear, indicating the existence of random vibration mode.
others developed a new model for predicting wellbore stability, and they found that whirl is directly related to wellbore instability, and collision with wellbore during drill string
A New Approach for Predicting Drillstring Vibration Impact on Wellbore …
Oct 9, 2017 · Results show a direct relation between whirl vibration initiation and wellbore instability; however axial and torsional vibrations have negligible effect. Wellbore failures resulted from drillstring vibration are more likely to happen in small hole sizes (6 in) than bigger holes.
Drillstring-borehole interaction: backward whirl instabilities and ...
The drillstring borehole interaction induces whirling behaviour of the drillstring causing forward whirl, backward whirl or intermittent bouncing behaviour depending on the system parameters. The purpose of this study is to analyse the steady backward whirl behaviour…
Numerical Analysis and Experiments of Whirl Characteristics in ...
Mar 25, 2018 · Combined with fluid-structure interaction and rotor dynamics, Wang et al. (2018) carried out numerical analysis and experiments on the whirl characteristics of drillstring in horizontal well and...
A New Approach for Predicting Drillstring Vibration Impact on Wellbore …
Oct 9, 2017 · Results show a direct relation between whirl vibration initiation and wellbore instability; however axial and torsional vibrations have negligible effect. Wellbore failures resulted from...
Stability of highly inclined non-circular wellbores in isotropic ...
Jun 26, 2024 · A lower wellbore pressure increases the hoop stress, while the radial stress (hyperbolic for elliptical wellbore) reduces at the same rate as the wellbore pressure. In the same vein, a higher wellbore fluid temperature compared to formation fluid can also cause the hoop stress to increase.
- Some results have been removed