Erosion Damage

Erosion Damage •

Erosion creates both wear of a surface due in part to impinging a slurry of particles, droplets, droplets, or bubbles in a fluid stream. • The damage variables are related to: – – – –

•

The mass of the particles, The velocity of the flowing fluid, The distance to the target,

The most severe effects are from high speed gas flow carrying hard, angular materials such as formation formation sand, proppant, or similar debris, that strike the surface of equipment at an oblique angle. 8/25/2015

George E. King Engineering

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Erosion - Sand production damage Sand production damage in a surface connection – the problem started with a small leak, probably interior erosion to the point where a seal was was lost, then the expanding gas made the problem









Maximum velocity when solids are the the flow stream? Not much! Maximum flowing fluid velocity for increasing particle diameters. diameters. Although smaller particles do less damage than larger particles (less mass), the sheer number of small particles can still do a significant

Max Velocities for Particle Sizes 150

c e s / f 100 . l e v x 50 a m

0.1 ft3/day 1 ft3/day

0 0

10 0

20 0

3 00









The Impingement Angle This data shows that direct impingement is much worse than flow inside a pipe (flow parallel to the the pipe wall). Tubing flow with frac fluid – fluid – high high velocity and high concentration of

Max Produci Producing ng Velocity Velocit y

4” pipe 4 s 3.5 p f , 3 y t 2.5 i c o 2 l e V1.5 x 1 a M0.5 0

Direct impingement 1 ft3/day









Damage at the screen – sharp angle Potential for damage Threshold velocity for screen like clearances - 5 mpy limit in 316 Stainless. Gas Flow.

0.00001 ft3/day 3 s 2.5 p f . l e 2 v d 1.5 l o h s 1 e r

from particles to 0.00001 ft3/day sand screen sized openings.

"Tee" Direct









Wirewrap Screen Erosion w/ Air











Multi-Layered Sintered Screen Erosion

Surface damage of a steel shell may











Test Screen Erosion – but be careful of conclusions……











Screen Damage from fr om Trinidad Trinidad The damage to the exterior screen shows the type of











Erosion Screen Damage Dama ge from Trinidad Trinidad Upper shroud removed showing











Erosion Screen Damage from Trinidad Upper shroud and support screen removed showing base pipe. Notice that the major damage is at the center

Plugged hole

Erosion













Erosion Screen Damage Dama ge from Trinidad Trinidad













Screen Plugging – usually the start of tthe he failure

























Erosion – not just from produced













Erosion angle – any angle other than









































































Erosion Damage

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