US 11,697,970 B2
Directly connected drill pipe applicable to extreme conditions
Hao Yin, Tianjin (CN); Jian Liang, Tianjin (CN); Xinmiao Li, Tianjin (CN); Jianhua Sun, Tianjin (CN); Kuan Li, Tianjin (CN); and Xiumei Liu, Tianjin (CN)
Assigned to INSTITUTE OF EXPLORATION TECHNIQUES, CHINESE ACADEMY OF GEOLOGICAL SCIENCES, Tianjin (CN)
Filed by Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Tianjin (CN)
Filed on Jan. 19, 2021, as Appl. No. 17/152,187.
Claims priority of application No. 202010059548.9 (CN), filed on Jan. 19, 2020.
Prior Publication US 2021/0222500 A1, Jul. 22, 2021
Prior Publication US 2022/0106841 A9, Apr. 7, 2022
Int. Cl. E21B 17/042 (2006.01); E21B 17/046 (2006.01); F16L 15/00 (2006.01); F16L 15/04 (2006.01)
CPC E21B 17/042 (2013.01) [E21B 17/046 (2013.01); F16L 15/001 (2013.01); F16L 15/04 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A directly connected drill pipe, comprising:
a tool joint pin having:
an outer annular projection extending axially outwardly and terminating in a main shoulder;
an inner annular projection extending axially outwardly and terminating in an auxiliary shoulder;
an annular groove disposed between the outer annular projection and the inner annular projection, the annular groove extending axially inwardly and terminating in a bottom surface comprising a main auxiliary shoulder;
a tool joint box having:
an outer annular groove extending axially inwardly and terminating in a main shoulder;
an inner annular groove extending axially inwardly and terminating in an auxiliary shoulder;
an annular projection disposed between the outer annular groove and the inner annular groove, the annular projection extending axially outwardly and terminating in a main auxiliary shoulder;
wherein a connection between the tool joint pin and the tool joint box comprises:
the outer annular projection of the tool joint pin operably connected to the outer annular groove of the tool joint box;
the inner annular projection of the tool joint pin operably connected to the inner annular groove of the tool joint box;
the annular projection of the tool joint box operably connected to the annular groove of the tool joint pin;
wherein the inner annular projection of the tool joint pin has a tapered profile extending from the auxiliary shoulder to the main auxiliary shoulder and the inner annular groove of the tool joint box has a tapered profile extending from the main auxiliary shoulder to the auxiliary shoulder;
wherein the main shoulder of the outer annular projection and the main shoulder of the outer annular groove comprise threads operably connected during the connection between the tool joint pin and the tool joint box.