Alexander Efremov Oct 2, 2019:

You are welcome.

Vertrad (asker) Oct 2, 2019:

Thanks a lot!

Alexander Efremov Oct 2, 2019:

шурф вертлюга Vertrad, it looks like "... воронка для установки шурфа" on the main rig floor refers to an opening for the mousehole ("шурф для наращивания") [as it has to be near the RT to enable rapid connections], whereas "на которой имеются шурф вертлюга" refers to the rathole (for both the kelly and the swivel) [located farther away from the RT than the mousehole], as can also be inferred from the first line of the abstract. I have not heard about a dedicated swivel rathole and think that having one simply does not make practical sense.

Vertrad (asker) Oct 1, 2019:

шурф вертлюга = rathole/ cellar of swivel
This is the combination that doesn't seem right to me. That's why, I decided to request your opinion. Please provide feedback. Thanks!