Joint While Drilling Technology by Acoustic Orientation and Its Applications

The conventional drilling oriented technology, which measures bit place while drilling, has large errors, and the errors are proportional to drilling depth. Therefore, the conventional drilling oriented technology cannot meet the requirements for borehore butt joint directly while drilling. Different from the conventional drilling oriented technology, joint while drilling technology by acoustic orientation can determine the relative direction of bit with target by measure the acoustic travel time from sonic source at the target. The nearer the bit from target is, the higher of the measure precision is. Its error is lower than 1 cm. The joint while drilling technol-ogy is high in efficiency, and can be use widely in special drillings, including joint drilling, colliding preventing drilling, overlapping drilling, and parallel drilling.