Marine Riser Monitoring With The Acoustic Ball Joint Angle-Azimuth Indicator

1971 ◽  
Author(s):  
Mark A. Childers ◽  
Gale A. Hazlewood ◽  
W.T. Lifrey
Keyword(s):  
Joint Angle ◽  
Ball Joint ◽  
Marine Riser

The Effect of Tool Joint Stiffness on Drill Pipe Fatigue in Riser Ball Joints

1989 ◽  
Vol 111 (4) ◽  
pp. 369-374 ◽  
Author(s):  
A. Ertas ◽  
W. R. Blackstone ◽  
B. K. Majumdar
Keyword(s):  
Fatigue Damage ◽  
Joint Angle ◽  
Drill Pipe ◽  
Joint Stiffness ◽  
Finite Element Models ◽  
Ball Joint ◽  
Marine Riser ◽  
Joint Angles ◽  
Ball Joints ◽  
Tool Joint

It is well known that the ball joint in a marine riser can cause fatigue damage in the drill pipe passing through. Previous investigators have assessed the damage done for a lower ball joint angle of 3–5 degrees (drilling) and 1–3 degrees (running casing). This paper extends that work to deep water operations in which an upper ball joint is also present. Also, it is shown, via finite element models, that tool joint bending stiffness can have a significant effect on fatigue life. Fatigue damage calculations, including this heretofore unconsidered effect, are presented for various ball joint angles and drill pipe tensions.

A Comparison of Fracture Mechanics and S–N Curve Approaches in Designing Drill Pipe

1992 ◽  
Vol 114 (3) ◽  
pp. 205-211 ◽  
Author(s):  
A. Ertas ◽  
G. Mustafa ◽  
O. Cuvalci
Keyword(s):  
Fracture Mechanics ◽  
Fatigue Damage ◽  
Drill Pipe ◽  
Ball Joint ◽  
Marine Riser ◽  
Deep Drilling ◽  
Miner’S Rule ◽  
Miner's Rule ◽  
Total Damage ◽  
Dynamic Fatigue

It is well known that the upper ball joint in a marine riser, in deep drilling, can cause fatigue damage in the drill pipe passing through it. A study of fracture mechanics and S–N curve approaches has been undertaken to determine the dynamic fatigue damage in the drill pipe. Miner’s rule is utilized in both methods to determine the total damage. The results of both methods are compared.

Dynamics of an automotive transmission consisting of a tripod joint and a ball joint. A symbolic approach

2002 ◽  
Vol 216 (3) ◽  
pp. 203-211 ◽  
Author(s):  
J-P Mariot ◽  
J-Y K'nevez
Keyword(s):  
Constant Velocity ◽  
Joint Angle ◽  
Driving Forces ◽  
Infinite Length ◽  
Ball Joint ◽  
Constant Input ◽  
Shaft Length ◽  
Intermediate Shaft ◽  
Automotive Transmission ◽  
Output Torque

The present paper deals with the zero friction dynamics of an automotive transmission consisting of an inboard ball joint close to the wheel and an outboard tripod joint close to the gearbox, connected by an intermediate shaft. The ball joint is a constant-velocity joint (CVJ) whereas the tripod joint is not. In the idealized case of an intermediate shaft of infinite length, the tripod joint behaves like a CVJ and has the following properties: the input and output torque are equal, the transverse forces generating the output torque are equal and there are no shudder vibrations or inertial shaft effects. For a real transmission with a finite-length shaft, deviations from constant-velocity (CV) properties are due to tripod joint angle variation which causes static and dynamic perturbations; these perturbations are expressed symbolically using first-order approximations in terms of tripod joint angle and ratio of shaft length to tulip radius. For most of the front drive cars equipped, the angle of the tripod joint remains close to 0.1 rad; considering a constant input torque at a 100rad/s input velocity, the perturbations are found to be less than 3 per cent for the driving forces when compared with the CVJ.

Vibration control of a flexible marine riser with joint angle constraint

2016 ◽  
Vol 87 (1) ◽  
pp. 617-632 ◽  
Author(s):  
Shuang Zhang ◽  
Xiuyu He ◽  
Chuan Yang
Keyword(s):  
Vibration Control ◽  
Joint Angle ◽  
Marine Riser

Criterion for Allowable Lower Ball Joint Angle in Floating Drilling

1980 ◽  
Vol 102 (4) ◽  
pp. 242-250 ◽  
Author(s):  
J. R. Fowler ◽  
T. N. Gardner
Keyword(s):  
Joint Angle ◽  
Drill Pipe ◽  
Ball Joint ◽  
Joint Angles ◽  
Joint Region ◽  
Wear Rates

In drilling from floating vessels, most operators and drilling contractors specify an allowable lower ball joint angle of 3–5 deg for drilling and 1–3 deg for running casing. Presently, no one uses tension in the drill pipe or casing as a factor in setting allowable ball joint angles. The results of the analysis detailed in this paper show that the allowable ball joint angles in use are justified for well depths less than 5000 ft below the ball joint. However, the allowable angle is too high for continual operation for well depths below the ball joint of 10,000 ft or more. The increased drill pipe or casing tension in deeper wells causes high alternating stresses in the drill pipe and high wear rates where the pipe bears against equipment in the ball joint region. The principal conclusion of this paper is that the allowable lower ball joint angle should not be constant, but should vary with the tension in the drill pipe as the well is being drilled.

Study on the Variations of Corner and Load on Bottom Ball Joint of Deep-Water Drilling Riser

2013 ◽  
Vol 318 ◽  
pp. 547-550 ◽  
Author(s):  
Qiang Tan ◽  
Jun Liang Yuan ◽  
Jin Gen Deng
Keyword(s):  
Deep Water ◽  
Drift Rate ◽  
Element Model ◽  
Lateral Force ◽  
Ball Joint ◽  
Force Analysis ◽  
Marine Riser ◽  
Offshore Drilling ◽  
Linear Mode ◽  
Wind Sea

As the offshore drilling expands to deep water, the influences of bottom ball joint corner and lateral force on drilling security become increasingly significant. During the force analysis, the environmental factors (e.g. wind, sea-flow force, sea ice, etc.) are usually taken into account. Besides, the engineering factors considered in research are top tension ratio and drilling vessel drift. In this paper, a finite element model is established by ANSYS to imitate the force condition of marine riser, so as to analyze the influence laws of top tension ratio and drilling vessel drift rate on marine riser stability (i.e. the corner and lateral force on bottom ball joint ) in Beaufort force scale 3 and 8 windy conditions. The results show that the lateral force increases with the drilling vessel drift rate and top tension ratio accordingly by linear mode. For the same tension increasing extent, the greater the drilling vessel drifts, the more increasing range the lateral force appears. The corner on bottom ball joint has a linear relation with the drilling vessel drift rate similarly. However, the corner on the bottom ball joint demonstrates a non-linear decreasing method as “fast followed by slow” due to the increasing top tension ratio. The research plays a role in the security assurance of sub-sea wellhead in deep-water drilling operation.

Development and testing of rolling cutter bit with a new arrangement of teeth on the balls

2020 ◽  
pp. 60-68
Author(s):  
V. A. Pyalchenkov ◽  
D. V. Pyalchenkov
Keyword(s):  
Axial Force ◽  
Axial Load ◽  
Vertical Line ◽  
Ball Joint ◽  
Line Passing

Research has found that the axial load applied to the bit is distributed unevenly along the crowns of the balls. The middle crowns are the busiest. The value of the axial force perceived by a separate ring is associated with the deformation of the details of the ball joint. You can reduce the uneven loading of crowns by shifting them along the ball along the radius of the bit, placing them so that the vertical line passing through the center of the lower ball of the lock bearing passes through the middle of the gap between the crowns of neighboring balls. The bits with the new option of placing the teeth on the balls were tested on the stand and in industrial conditions. For the bits of this design, the axial load was distributed more evenly over the crowns, which allowed increasing the efficiency of their work.

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