BOPI 12 BR/2023 REPERTOIRE NUMERIQUE 46 Figure 4 ________________________________________ (11) 21326 Consulter le mémoire (51) E21B 17/042 (2018.01) (21) 1202300346 - PCT/EP2022/054823 (22) 25/02/2022 (30) EP n° 21159696.0 du 26/02/2021 (54) Coupling for connecting downhole tubulars with improved stress distribution. (72) JANSSON, Tomas (SE) et NORDBERG, Anders (SE) (73) SANDVIK MINING AND CONSTRUCTION TOOLS AB, 81181 SANDVIKEN (SE) (74) S.C.P AKKUM, AKKUM & Associates, n° 1777, Rue 6.261, Auditorium Jean Paul II, Quartier Mbankolo, B.P. 4966, YAOUNDE (CM). (57) A coupling for connecting downhole tubulars, comprising a tubular body; a female coupling 5 part; a male coupling part; and at least one of: a male screw thread formed on an outer surface of the body, and a female screw thread formed in an inner surface of the body, wherein: the at least one thread has a thread-form including a crest, a root, and a pair of flanks, the crest and the root are each cambered about a respective first and second camber radius, Rh, Rb-T along the entire length of the thread-form, and each camber radius, Rh, Rb-T, is greater than an outer 10 diameter of the coupling; the male screw thread has a camber radius, Rbm, and the female screw thread has a camber radius, Rbf; characterized in that: the ratio of the male thread camber radius to the female thread camber radius (Rbm/ Rbf) is between < 1.0 and <1.1. Fig. 4 ________________________________________ (11) 21327 Consulter le mémoire (51) E21B 17/042 (2018.01) ; F16L 15/06 (2018.01) (21) 1202300362 - PCT/FR2022/050508 (22) 21/03/2022 (30) FR n° FR2103327 du 31/03/2021 (54) Dimensioning of a threaded axial gap. (72) MATHON Thibault (FR); BOUFFLERS Laurent (FR) et LUONGO Matthieu (FR) (73) Nippon Steel Corporation, 6-1, Marunouchi 2-chome Chiyoda-ku, TOKYO, 100-8071 (JP) et
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