How to Avoid Bottom Hole Assembly Twist Off Challenges in Underreaming While Drilling Operations Using 4D Finite Element Analysis Modelling

2019 ◽  
Author(s):  
Olzhas Zhandayev ◽  
Gaukharbek Ungaliyev ◽  
Biju James
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Bottom Hole ◽  
Bottom Hole Assembly ◽  
Drilling Operations

Failure Analysis of a Die for Cold Precision Forging of Bevel Gears

2008 ◽  
Vol 44-46 ◽  
pp. 779-786
Author(s):  
Jun Song Jin ◽  
Ju Chen Xia ◽  
Xin Yun Wang ◽  
Hua Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Corner Crack ◽  
Premature Failure ◽  
Bevel Gears ◽  
Precision Forging ◽  
Bottom Hole ◽  
Cold Precision Forging ◽  
Reduce Stress Concentration

The life of bevel gear dies is determined by its stress state mainly. During the forging, the die teeth fractured and the bottom corner cracked in a few times. Finite Element Analysis (FEA) was employed to investigate the reason of failure. The results show that the tip fracture and the bottom corner crack mainly resulted from excessive tensile stress. In accordance with the FEA results, the non-plane parting face was changed into plane parting face and the radius of bottom hole was enlarged. The FEA result proves that the modification can greatly reduce stress concentration and the application proves that the modification can effectively solve the premature failure of the die.

scholarly journals Influence of flex-sub on mechanical properties of rotary steerable drilling system

2020 ◽  
Vol 11 (2) ◽  
pp. 285-297
Author(s):  
Jin Wang ◽  
Qilong Xue ◽  
Lixin Li ◽  
Leilei Huang ◽  
Fangtao Li ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Variable Stiffness ◽  
Mechanical Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Drilling Performance ◽  
Inclination Angles ◽  
Bottom Hole Assembly ◽  
Drill Collar

Abstract. In this paper we analysis of the dynamic model of the Rotary Steerable System (RSS) with a single stabilizer and flex-sub. The drill collar and joint are simplified to obtain suitable bottom-hole assembly (BHA) model of mechanical analysis and finite element analysis. Using the BHA uniform stiffness assumption (ignoring the influence of variable section and variable stiffness of drill collar in BHA), the paper takes a method of the longitudinal and transverse bending continuous beam method to analyse the stress of BHA with RSS with the flex-sub under different inclination angles and curvature conditions. In addition, a dynamic analysis model is proposed, and the dynamic stress of drilling tools with RSS is analysed. Through the software of ANSYS, the finite element analysis of the RSS with the flex-sub is carried out to verify the theoretical results. The influence of flex-sub on the steering drilling performance of RSS is studied, and the optimized parameters of flex-sub design are obtained, which provides useful suggestions for the design of RSS.

Finite element analysis on dental implant[ndash ]supported prostheses without passive fit

2002 ◽  
Vol 11 (1) ◽  
pp. 30-40 ◽  
Author(s):  
Chatchai Kunavisarut ◽  
Lisa A. Lang ◽  
Brian R. Stoner ◽  
David A. Felton
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dental Implant ◽  
Element Analysis ◽  
Passive Fit
Sign in / Sign up

Export Citation Format

Share Document