Patent ID: 8496273

Claim:
An oil field connection system for production and injection tubing sections comprising: a sleeve coupling having an interior seating span of predetermined axial length and defining a seating surface of substantially constant inner diameter and with the sleeve coupling including oppositely axially extending mill end and field end female threaded sections adjacent to the seating span and both having the same threads; a mill end of a first one of the production and injection tubing sections and a field end of a second one of the production and injection tubing sections, each with male thread pin ends configured to be inserted into, and coupled to the respective mill and field end female threaded sections of the sleeve coupling; and a deformable seal ring, the seal ring having an outer diameter positioned in the seating span of the sleeve coupling and having an outer surface conforming to the seating surface, the seal ring including an approximately central portion and oppositely extending asymmetric mill end and field end terminal sections which taper at different angles of taper with respect to each other and with mill end and field end terminal section lengths different from each other, the mill end and field end terminal sections each extending longitudinally from the central portion of the seal ring toward respective axial ends of the seal ring, the mill end and field end terminal sections of the seal ring extending to respective positions to be intercepted by starting thread areas of the pin ends of the inserted mill and field ends of the first and second ones of the production and injection tubing sections and being deformed by the starting thread areas of the pin ends of the tubing sections, the field end terminal section of the seal ring being longer than the mill end terminal section of the seal ring, multiple connections of the pin end of the field end of the second one of the production and injection tubing sections with the field end section of the sleeve coupling resulting in increasing penetration of the pin end of the field end of the second one of the production and injection tubing sections into the field end terminal section of the seal ring with each such connection.