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Technical Discussions
Sardar Omar
United Arab Emirates (UAE), Joined May 2015, 3

Sardar Omar

United Arab Emirates (UAE),
Joined May 2015
3
17:33 Jun-02-2018
Bending stress ratio (BSR)

Hello everyone, Good Day..... Could anyone explain to me how to calculate BSR for BHA.??
Thank you....

 
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Webmaster
Webmaster
23:36 Jun-02-2018
Re: Bending stress ratio (BSR)
In Reply to Sardar Omar at 17:33 Jun-02-2018 (Opening).

Please ignore this forum test

 
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Bruce McPherson
Consultant
MFL Services, United Kingdom, Joined Mar 2009, 26

Bruce McPherson

Consultant
MFL Services,
United Kingdom,
Joined Mar 2009
26
16:41 Jun-04-2018
Re: Bending stress ratio (BSR)
In Reply to Sardar Omar at 17:33 Jun-02-2018 (Opening).

When two BHA components are screwed together the resulting connection has a bending strength ratio (BSR) which depends on the following:
a. The type of connection (NC50, 6 5/8REG etc etc)
b. The OD of the box
c. The ID of the pin
There are tables in API RP7G and DS-1 which, using values for the items listed above will provide the BSR.
BSR is typically calculated for drill collars, using the box OD of the collar and the pin ID of the same collar.
Obviously this is technically incorrect since it's not possible to screw the pin of a drill collar into it's box. However it works well because the ID of the pin does not change during service, and in a string of drill collars with the same ID, the BSR will be directly related to the OD of the box.
Do NOT try to calculate BSR for any BHA items other than drill collars.
Unless it is known exactly which 2 components are to be screwed together on the rig floor, it is not possible to know the correct OD and ID to use.
This particularly applies to crossover subs where an inspector cannot know what a particular crossover sub will be mated to unless he is on the rig floor to measure the OD and ID at the time of make up
Do NOT try to calculate BSR for heavy weight drill pipe - the results will be meaningless because a lot of the bending stress is absorbed by the pipe body

Best Regards

Bruce McPherson

 
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