Casing Design

[vanket]

Can someone help me about my research. I would like to learn the concepts needed for casing design, but i don't know where to start.
I hope for everyone's kind assistance. Thanks!

[zambroata]

Hi Vanket,

the best way to start is to have a basic understanding the purpose of each casing string installed in a well. once you familiar with the name, common size, grade , then you'll go the geometry of the well itself with respect to the available size. After understanding this, you may go to the engineering calculation. all these are available in the internet..for theory and practical, i would suggest to you Hussein Rabia well engineering material.

[BOUGHELOUM]

[link Point to another website Only the registered members can access]

[BOUGHELOUM]

[link Point to another website Only the registered members can access]

[vanket]

Thanks for the help guys! I've read the two books and it was very helpful. But i'm having a problem for deviated and horizontal wells, I don't know how to solve for collapse and burst??

[BOUGHELOUM]

use TVD depth to calculate collaps and burst

[vanket]

Ohw.. i see! Thanks! can you give me an example solution for horizontal well? I still can't imagine the process for horizontal well. I really appreciate your help. Thank you very much!

[BOUGHELOUM]

open this book ''Rahman - Casing Design, Theory and Practice'' and go to ''Chapter 4'' there is an exemple

[vanket]

Thanks! By the way, i'm having a problem about reference point. In rabia, what is pressure in surface? is it RKB or at the wellhead? Where is the reference point? How about in subsea and offshore rigs?

[BOUGHELOUM]

i worked only in onshore (land rig), the reference point is wellhead (landed point of casing in casing hanger)

[vanket]

Ohw! Thank you sir! your a great help. I was very confused between ground level, RKB, mean sea level, wellhead.. hehe. Because i've read the example from rabia, the part where the burst from pressure testing was calculated. Why was the back up gradient 0.465x2200? Should it be 0.465x(2200-60)?
the MSL=60'
GL or seabed=140'
the casing shoe depth=2200'
reference point:RKB

[BOUGHELOUM]

there is an error the true value of back up is 0.465x(2200-60)