Overview on vertical and directional drilling technologies ...
2017-8-26 · (Gatlin 1960). The percussion drilling method, however, did not begin in the United States, but was employed first by the drilling of brine wells in China (Gatlin 1960; Chen 2011). In this method, the steel bit successive pounds the bottom hole by pulverizing the rock (Hyne 2001), people or animals are employed as power sources.