Patent ID: 8863831
Filing Date: 2014-10-21
Classification: E21B

Abstract:
1. 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 ( a transport assembly (B) comprising a fishing neck ( a free mandrel assembly (C), consisting of one upper mandrel with a standard upper formation injection valve ( a fixed bottom hole assembly (D), consisting of an upper body ( 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 (