Mechanical oscillator frees stuck pipe strings using resonance technology

Buck Bernat, Henry Bernat Vibration Technology LLC Shreveport This mechanical oscillator can handle dynamic hook loads up to 160,000 lb. It has successfully retrieved stuck coiled tubing and liners (Fig. 3). Resonant vibration technologies provide an alternative method for freeing stuck coiled-tubing, liners, and drillstrings. Situations where the axial reciprocation of pipe; the use of large tensile, compressive, or percussive forces; or where pipe/well bore friction prohibits movement of the string may respond favorably to the use of pipe vibration. Although vibratory technology for recovering stuck members was first patented almost 40 years ago, very l...

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