Method and apparatus for oscillating a drill string
The present invention provides a method for oscillating drillstring (135). The method comprises the following steps: (a) rotating the drillstring (135) in a first direction until arriving at a first limit; and (b) rotating the drillstring (135) in a second direction until arriving at a second limit....
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| Hauptverfasser: | , |
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The present invention provides a method for oscillating drillstring (135). The method comprises the following steps: (a) rotating the drillstring (135) in a first direction until arriving at a first limit; and (b) rotating the drillstring (135) in a second direction until arriving at a second limit. The invention is characterized in that the first limit and the second limit are based on the magnitude of energy exerted in the rotating period. |
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