Discussion Forum > Casing & Liners > Drift mandrel OD size used for 9-5/8" 53.5# casing

Drift mandrel OD size used for 9-5/8" 53.5# casing

25 January 2021
Dear Colleagues,  
 
I'd like to have some information about what OD size of drift mandrel would be used for 9-5/8" 53.5# casing.
Three choices would be available.
(1) API Standard Drift: 8.379" OD
(2) API Alternative Drift: 8.500"OD
(3) (Company-specified) Special Drift

Is there anyone who uses (3) Special Drift for 9-5/8" 53.5# casing?

We usually use (3) Special Drift, which is 8.531" (= 8.5" + 1/32"). - 1/32" means OD tolerance for 8-1/2"OD rock bit.

I understand (2) API Alternative Drift is normally used if 8-1/2" bit is run.  
However, I'd like to know if there is anyone who sticks to 1/32", which is rock bit OD tolerance, for drift mandrel size even though nominal casing ID (8.535") is larger than 8.531", which is the theoretical maximum bit OD.

Any feedback would be appreciated.

Regards,
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12 Answer(s)
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Posted by

Hideaki TSUKUI

Hideaki TSUKUI

Well Operations Manager

Japex

Discussions: 3

Replies: 4

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