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Drill string oscillation methods

  • US 9,290,995 B2
  • Filed: 12/07/2012
  • Issued: 03/22/2016
  • Est. Priority Date: 12/07/2012
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • oscillating, with a first acceleration profile, at least a portion of a drill string using a top drive coupled to the drill string, the first acceleration profile comprising pre-stored oscillation parameters including a first acceleration having a first wave form type defined by a first wave shape selected from a group consisting of;

    sinusoidal, stepped, and triangular;

    oscillating, with a second acceleration profile different from the first acceleration profile, at least a portion of the drill string using the top drive, the second acceleration profile comprising pre-stored oscillation parameters including a second acceleration having a second wave form type defined by a second wave shape of the second wave form, the second wave shape selected from a group consisting of;

    sinusoidal, stepped, triangular, and a transition between any one of the sinusoidal, stepped, and triangular wave shapes relative to the first wave shape, the second wave shape defining the second wave form type being different than the first wave shape defining the first wave form type; and

    oscillating, with a third acceleration profile, at least a portion of the drill string using the top drive, wherein the third acceleration profile is optimized based on the feedback data obtained while oscillating with the first acceleration profile and feedback data obtained while oscillating with the second acceleration profile.

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