| 摘要 |
PCT No. PCT/US85/00260 Sec. 371 Date Jul. 18, 1986 Sec. 102(e) Date Jul. 18, 1986 PCT Filed Feb. 19, 1985 PCT Pub. No. WO86/03275 PCT Pub. Date Jun. 5, 1986.A connection (20) for oilwell tubing and the like is disclosed which has the same outer diameter (21) as does the tubing joints (8 and 9) that it connects. Tubing joints are formed internally with a tapered thread (6 and 7) having a loadbearing flank angle (75 DEG or more) that negates pullout tendency. A mating coupling (2) having external threads (3 and 4) may be provided with a bore 10 so as to clear a driftbar. Coupling (2) may be provided with bore (13) extending from (14 to 15) so as to develop substantially, a 100% joint strength. |
