Page 74 - Drilling Technology in Nontechnical Language
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Chapter 3 – DRILLING A LAND EXPLORATION WELL                      65






                 hole opener, which has a set of cutters mounted outside a short drill collar
                 (fig. 3–16). Below the hole opener is placed a tool called a bullnose, which

                 is like a short drill collar with a rounded nose and a hole in the end for mud
                 to exit. The bullnose guides the hole opener along the original hole and
                 minimizes the chances of cutting another hole.











































                 Fig. 3–16. A hole opener showing the cutters


















        _Devereux_Book.indb   65                                                  1/16/12   2:06 PM
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