Method and apparatus for setting and retrieving a deflection tool

Abstract

A drill string includes an anchor type set down bit threadedly connected to the deflection section. Threadably coupled above the deflector section is a shear and retrieve sub having three equally spaced latch pin receptacles and three equally spaced shear pin holes. Above the shear and retrieve sub is a beveled guide section for receiving a retrieving setting tool having a tapered end sized to be inserted within the beveled guide section. The shear and retrieve section has three equally spaced latch pin mechanisms and three equally spaced shear pins. A pickup cross over sub is coupled into the top of the shear and retrieve sub and has an enlarged diameter ring which acts to limit the downward movement of the shear and retrieve section within the interior of the beveled guide and retrieving setting tool sections. A drill string operating from the earth's surface is coupled into the pickup cross-over sub which allows the entire assembly to be lowered into an earth borehole to a desired depth. By applying additional set down weight through the drill string, the shear pins are sheared and the deflector section remains at the desired depth in the borehole. In the retrieving mode, the retrieving setting tool is run back into the earth borehole on the drill string to latch with the shear and retrieve section to enable the retrieval of the deflector section.