Analysis of Sinusoidal Buckling of Drill String in Vertical Wells Using Finite Element Method

2019 ◽  
Author(s):  
Mehmet Cebeci ◽  
ismail Hakki Gücüyener ◽  
Mustafa Versan Kök
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Drill String ◽  
Vertical Wells ◽  
Sinusoidal Buckling ◽  
Element Method

Buckling Analysis of Drill Strings in Inclined Wellbores Using the Explicit Finite Element Method

2012 ◽  
Author(s):  
Mehdi Hajianmaleki ◽  
Jeremy S. Daily ◽  
Lev Ring ◽  
Raju Gandikota
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Drill Pipe ◽  
Drill String ◽  
Buckling Load ◽  
Explicit Finite Element Method ◽  
Explicit Finite Element ◽  
Buckling Behavior ◽  
Inclination Angles ◽  
Element Method

Understanding drill string buckling behavior is a significant challenge to the petroleum industry. In this paper, the explicit finite element method implemented in Abaqus software is employed to study the buckling of drill strings for inclined straight wellbores. Classic solutions for the critical buckling length of self-weighted columns as well as critical buckling load for drill pipe inside inclined wellbores are compared to explicit FEA and accurate results are provided by the finite element based predictions. The effect of different inclination angles and string effective weight due to the buoyancy effect has been studied and the results for sinusoidal and helical buckling are compared to analytical results and experimental data in the literature. The theoretical predictions for different inclination angles agree with the simulations. Theoretical buckling load of inclined drill strings approaches zero by decreasing the effective weight of a floating drill string. However, the results of finite element simulations show that significant buckling load would still exist for very low drill string effective weight. These results are confirmed by experimental results provided by other researchers. Overall, the efficacy of using explicit finite element methods to model drill string buckling behavior is demonstrated.

scholarly journals A REVIEW DYNAMIC VIBRATION ON DRILL STRING IN DRILLING OPERATION

Sebatik ◽  
2019 ◽  
Vol 23 (1) ◽  
pp. 1-8
Author(s):  
Afriansyah Afriansyah ◽  
Hasan Basri
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Method ◽  
Natural Frequencies ◽  
Differential Quadrature Method ◽  
Drill String ◽  
Differential Quadrature ◽  
Quadrature Method ◽  
Drilling Operation ◽  
Element Method

For decades, researchers have investigated the phenomenon of vibrations in drilling activities. One of the interesting things is the vibration in the drillstring. Vibration might be caused by Interfere with each other between the drilling mud and drilling string, contact forces between the drillstring and wellbore, and interfere with each other between bit and wellbore that can ruin the drilling equipment, the drillstring and/or the stabilizers.  This paper presents several experiments in different methods to predict vibrations of drill string in the drilling operation. There are three types of vibration in drilling operation. First, axial vibration generated from interaction between bottom hole and bit. Second, Torsional vibration that excited from resonance of drill collar, bit chatter, stick slip between formation and bit and modal coupling. Third, lateral vibration that excited from interaction between formation and bit, imbalance of mass, whirl of bit, and from force of fluid around drill string. One or whole type of these vibration can vibrate the drillstring and it result damage of drillstring as reperesent by decrease in rate of penetration or damage of bit. In this paper, we will compare several methods to predict deflection, natural frequencies, and trajectory or orbital during impact for finite element method, differential quadrature method, and multibody dynamic method. Result show that all method can be used for calculating deflection, Finite element method and differential quadrature method for account natural frequencies, multi dynamic method for calculate trajectory during impact. However, for simple method to calculate or predict vibration used Differential Quadrature method. The future work will involve investigation on vibration in drillstring with combine several method

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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