Connecting assembly and receptacle adapted to receive said connecting assembly for connecting two tubing sections, and method for installing and connecting two tubing sections in a wellbore

The invention relates to a connecting assembly to be plugged into a mating receptacle in a wellbore, comprising a first sleeve including a second sleeve and having a top connecting end and a bottom connecting end, characterized in that: - the first sleeve comprises the bottom end and has a top end opposite to said bottom connecting end, said bottom connecting end being provided with an end cap for preventing entrance of materials and capable of being opened; - said second sleeve comprises said top connecting end located outside of the first sleeve and has a bottom end opposed to said top connecting end; - said connecting assembly comprises a locking mechanism adapted to locksaid second sleeve in a position relative to said first sleeve such that the bottom end of the second sleeve is inside said first sleeve, and - the dimensions of the first sleeve and second sleeve are adapted such that when said locking mechanism is unlocked, said second sleeve is allowed to move relative to said first sleeve to impinge and open said end cap.