公开(公告)号：US20180135783A1

公开(公告)日：2018-05-17

申请号：US15576123

申请日：2016-05-19

Applicant: SANDVIK INTELLECTUAL PROPERTY AB

Inventor： DAVID WICKSTRÖM ,  ANDREAS NORMAN

IPC: F16L15/06 ,  E21B17/042

CPC classification number: F16L15/06 ,  E21B1/00 ,  E21B17/0426

Abstract: A threaded coupling for a drill string component includes a body on which is formed a thread. A reduction in stress concentrations and a resistance to bending moments are achieved at the thread by reducing a thread depth at at least one axial end of the thread and by arranging an endmost flank of a crest or root of the thread at an endmost helical turn.

公开(公告)号：US20180135782A1

公开(公告)日：2018-05-17

申请号：US15576113

申请日：2016-05-19

Applicant: SANDVIK INTELLECTUAL PROPERTY AB

Inventor： PETRI AHOLA ,  DAVID WICKSTRÖM ,  ANDREAS NORMAN

IPC: F16L15/06 ,  E21B17/042

CPC classification number: F16L15/06 ,  E21B1/00 ,  E21B17/042

Abstract: An elongate component, such as a drill rod or adaptor, forms part of a drill string having a shoulder contact male spigot coupling. The male spigot includes a non-threaded shank and a threaded section in which an axial length of the non-threaded shank is provided at a predetermined minimum relative to an outside diameter of the spigot at the threaded section.