Patent ID: 8863831

Claim:
A free mandrel system, protected casing, hydraulically driven by injection fluid to be applied in the petroleum industry for selective injection of fluids, liquids or gases, in different formations while keeping the casing isolated from fluid pressure and operated from the well head by a single person handling surface valves to set and recover all injections valves together comprising five interconnected basic assemblies: a surface assembly (A) comprising an installation and release mast ( 4 ), a lubricator ( 3 ) with a catcher ( 2 ), required standard valves ( 6 1 , 6 2 , 6 3 , 6 4 , 6 5 and 7 ) and an impeller circulation pump ( 5 ) to enable the operations of said surface assembly (A); a transport assembly (B) comprising a fishing neck ( 11 ) with a retention valve ( 12 ), a pair of rubber cups ( 13 ) that slide over a central tube and a lower connector ( 14 ); a free mandrel assembly (C), consisting of one upper mandrel with a standard upper formation injection valve ( 18 ) and a lower mandrel with a designed-to-measure lower formation injection valve ( 21 ) for the two said formations to be selectively injected; a fixed bottom hole assembly (D), consisting of an upper body ( 24 ) with an upper packer collar ( 25 ), an upper collar seal ring ( 26 ) and a lock nut ( 27 ) to fix to lower body ( 28 ); a lower body seal ring ( 29 ), a spacer ( 30 ) and spacer outlet perforation ( 31 ) to inject into upper formation; lower packer collar ( 32 ) with lower packer collar seal ring ( 33 ), a seat ( 34 ) with seat seal rings ( 35 ), and laterally at least one casing protective valve ( 36 ) and fluid vertical passages (C 2 ); a complementary assembly (E) screwed in the lower end of said fixed bottom hole assembly (B) comprising: in its inner part a telescopic union inner body ( 37 ), an injector tube ( 40 ) and a designed-to-measure injector plug ( 41 ); in its outer part, an on-off sealing connector ( 43 ) screwed to the lower end of said fixed bottom hole assembly (D), to the upper end of standard upper packer hydraulically fixed ( 44 ), to injector plug ( 41 ) screwed to upper packer ( 44 ) lower end and in injector plug ( 41 ) lower end the necessary quantity of 60.325 mm (2″⅜) tubing to fix a lower packer hydraulically fixed ( 46 ) to separate both formations and at least one 60.325 mm (2″⅜) tubing ( 47 ) placed below lower packer hydraulically fixed ( 46 ) with a shear out ( 48 ) at its end.