Patent ID: 7331387

Claim:
A method of locating a deflecting tool at a required position relative to a window formed in a casing of a well, the method comprising: running into the casing an assembly of the deflecting tool and, located below the deflecting tool and rotationally fast therewith, a window finding device having a body and a window engaging member mounted in the body so as to be movable between a retracted position and an extended position, the window engaging member projecting a greater distance from the body when in the extended position than when in the retracted position, and being adapted to project into the window when in the extended position; positioning the assembly so that the window engaging member projects into the window; raising the assembly so that the window engaging member slides along a casing edge defining the window to locate the window engaging member centrally in the window at an upper end thereof and thereby locating the deflecting tool at a known orientation and depth relative to the window; and subsequently lowering the assembly a pre-determined distance to position the deflecting tool at the required position relative to the window.