Drill-pipe and casing lengths and threads

Good morning

I have got two questions  that I want to share with you and discuss the answer:

 1- why the Drillpipes and Casing have not the same length and we have many ranges and even for the same range we find different lengths?!

 2- why the drillstring is delivered with different threads and is not made from only one thread?!

Thanks

Dave

4 Answer(s)

---