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SYSTEMS AND METHODS FOR IMPROVING DRILLING EFFICIENCY

  • US 20120217067A1
  • Filed: 09/21/2010
  • Published: 08/30/2012
  • Est. Priority Date: 09/21/2009
  • Status: Active Grant
First Claim
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1. A method for drilling a borehole in an earthen formation, comprising:

  • (a) providing a drilling system including a drillstring having a longitudinal axis, a bottom-hole assembly coupled to a lower end of the drillstring, and a drill bit coupled to a lower end of the bottom-hole assembly;

    (b) rotating the drill bit at a rotational speed;

    (c) applying weight-on-bit to the drill bit and advancing the drill bit through the formation to form the borehole;

    (d) pumping a drilling fluid down the drillstring to the drill bit, wherein the drilling fluid has a flow rate down the drillstring;

    (e) oscillating the rotational speed of the drill bit during (c); and

    (f) generating non-steady state conditions in the borehole during (e).

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