Patent ID: 7096962

Claim:
A method of recovering use of a downhole wellbore which has become unintentionally blocked by downhole equipment that has become jammed in the wellbore, the downhole equipment comprising opposite first and second end portions and a release joint therebetween, said release joint permitting separation of said first end portion when jammed within the wellbore from the second end portion, the method comprising the steps of separating, at the release joint, the second end portion of said equipment from said first, jammed end portion , running the second end portion uphole out of the wellbore, running a deflector assembly downhole into the wellbore, restricting relative movement between the deflector assembly and the wellbore by engaging the deflector assembly with said first end portion of said equipment so as to substantially prevent relative rotation between said first end portion and a first portion of said deflector assembly engaged therewith, and then deflecting a milling tool from the wellbore into surrounding formation by means of the deflector assembly so as to form a branch borehole the deflector assembly engaging said first end portion by means of co-operating splines provided on the deflector assembly and said first end portion, the deflector assembly being rotationally orientated into an angular position required when deflecting a milling tool prior to the deflector assembly being engaged with said first end portion.