Free body diagram for casing with packer assembly

[Sanjay1005]

Has anyone created a thread on Free Body Diagram on assembly having many components ? For example a Casing having premium threads in both end and a set packer within it. What would be the FBD equations to determine various forces and reaction forces

 

[Dr.D]

Why don't you post some diagrams and then maybe someone can provide an answer?

 

[Baluncore]

It would help if we knew the subject field.
Maybe drill strings, or casing in petroleum industry production wells?