US 12,110,746 B2
Threaded joint for production tubing
Sergey Alexandrovich Rekin, Moscow (RU); Alexey Sergeevich Myslevtsev, Taganrog (RU); Pavel Nikolaevich Sidorenko, Taganrog (RU); and Pavel Konstantinovich Ponomarenko, Taganrog (RU)
Assigned to Publichnoe Aktsionernoe Obshchestvo Trubnaya Metallurgicheskaya Kompaniya, Moscow (RU)
Appl. No. 18/011,651
Filed by Publichnoe aktsionernoe obshchestvo “Trubnaya metallurgicheskaya kompaniya”, Moscow (RU)
PCT Filed Jun. 29, 2020, PCT No. PCT/RU2020/000315
§ 371(c)(1), (2) Date Dec. 20, 2022,
PCT Pub. No. WO2022/005320, PCT Pub. Date Jan. 6, 2022.
Prior Publication US 2023/0250699 A1, Aug. 10, 2023
Int. Cl. E21B 17/02 (2006.01); F16L 15/04 (2006.01); F16L 15/06 (2006.01)
CPC E21B 17/02 (2013.01) [F16L 15/04 (2013.01); F16L 15/06 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A thread connection for tubing; said thread connection comprises:
male and female elements, at the ends of which on the outer and inner surfaces, respectively, trapezoidal threads with a taper of 1:16 are provided; said trapezoidal threads each includes a turn profile root with a taper of 1:16 and a turn profile crest parallel to a thread axial line;
sealing surfaces and shoulder end face surfaces collectively forming an internal sealing unit, wherein an angle in the range from 14 to 16° is provided between the shoulder end face surfaces and a thread axis normal line;
wherein:
the trapezoidal threads of the male and female elements are arranged with a slope angle of a load flank of the turn profile in the range from −1 to +1° to the thread axis normal line, and a slope angle of a stab flank of the turn profile is arranged in the range from 14 to 16° to the thread axis normal line;
the internal sealing unit is formed by:
the sealing surfaces arranged on the male and female elements with the slope angle in the range from 17 to 19° to the thread axial line, and the shoulder end face surfaces of the male and female elements; and
the internal sealing unit is provided with:
additional surfaces arranged between the sealing surfaces and the shoulder end face surfaces on the male and female elements, and a joint of the sealing surfaces with the additional surfaces is provided in the form of a concave spherical surface on the male element and a convex spherical surface on the female element.