US 11,753,877 B2
Tubular threaded connection
Benoit Briane, Boulogne-Billancourt (FR); Alan Fothergill, Boulogne-Billancourt (FR); Satoshi Maruta, Chiyoda-ku (JP); and Yosuke Oku, Chiyoda-ku (JP)
Assigned to VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries (FR); and NIPPON STEEL CORPORATION, Chiyoda-ku (JP)
Appl. No. 17/54,974
Filed by VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries (FR); and NIPPON STEEL CORPORATION, Chiyoda-ku (JP)
PCT Filed May 24, 2019, PCT No. PCT/EP2019/063437
§ 371(c)(1), (2) Date Nov. 12, 2020,
PCT Pub. No. WO2019/224345, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 18305640 (EP), filed on May 25, 2018.
Prior Publication US 2021/0254414 A1, Aug. 19, 2021
Int. Cl. F16L 15/00 (2006.01); E21B 17/042 (2006.01)
CPC E21B 17/0423 (2013.01) [F16L 15/001 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A threaded tubular connection, comprising:
a tubular female end extending from a main body of a first tubular member, the tubular female end comprising
a female external thread between a female shoulder and a female free end, and
a female internal thread such that the female shoulder is a female intermediate shoulder located between the female external thread and the female internal thread; and
a tubular male end extending from a main body of a second tubular member, the tubular male end comprising
a male external thread, a male internal thread and a male shoulder, said male external thread is configured to interlock by thread engagement with the female external thread, said male internal thread is configured to interlock by thread engagement with the female internal thread, and
wherein the tubular male end comprises a first machined inner surface of the male end close to the male free end, a second inner diameter located outside of at least one thread root of the male external thread in a radial direction of the threaded tubular connection such that the second inner diameter is smaller than a first inner diameter of the first machined inner surface.