E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/00 (2006.01) F04B 47/00 (2006.01) F04B 53/14 (2006.01)
Patent
CA 2576538
An elongated drive string assembly comprising a plurality of hollow sucker rods and a connecting elements with an axis, connected together and between a drive head located at the surface of an oil well and a rotary pump located deep down hole in an oil well. Each hollow sucker rod has at least a first end comprising an internal female threaded surface engaging an external male threaded surface on a connecting element, such as a nipple, In order to further optimize the stress distribution between the elements, frustro-conical, non-symmetrical threads with a differential diametral taper are used. Preferably two torque shoulders with a maximized mean diameter and cross- sectional area are used to resist storing reactive torque in the drive string. The nipple free end defines a second torque shoulder that adds to the torque transmission during make-up while also defining a small seal at that free end to decrease corrosion erosion problems. This overall configuration ensures high yield torque, high shear strength, lowered stress concentration and a surprising resistance to storing reactive torque, which minimizes dangerous backspin when power to the sucker rod string is interrupted.
Ernst Hugo A.
Villasante Jose A.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Siderca S.a.i.c.
LandOfFree
Improved hollow sucker rod connection with second torque... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improved hollow sucker rod connection with second torque..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved hollow sucker rod connection with second torque... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1973797