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Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)
Baosong Ma
Baosong Ma
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ASME Press
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It is difficult for drillers to drill borehole fast and straight for a long time. The technology of automatically vertical drilling was originally developed in Germany and it was largely improved by KTB in 1990s. Later, other kinds of vertical drilling systems used for oilfield were manufactured, like Verti Track by Baker Hughes INTEQ and Power V by Schlumberger. However, it is too expensive for Chinese users and sometimes it can not meet their needs in some special area. A new type of vertical drilling system is introduced in this paper. The system consists of the units of power, inclination measurement, electronic controlling, and hydraulic extending. The feature that all of parts are mounted in the still annulus makes it very simple in term of the structure and thus it gains the benefit of cost saving. The system can produce a horizontal force based on the input which may vary with the formations and the requirement of correcting speed. Since the power unit is driven by pipe string, the system can even work well without drilling fluid. The system completes all of work at downhole so it is also called closed-loop at bottom hole.

Design of the Vertical Drilling System
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