Measuring and testing – Borehole or drilling – During drilling
Patent
1997-06-25
1999-01-26
Brock, Michael
Measuring and testing
Borehole or drilling
During drilling
175 39, E21B 4400, E21B 1202
Patent
active
058640584
ABSTRACT:
A downhole sensor sub is provided in the lower end of a drillstring, such sub having three orthogonally positioned accelerometers for measuring vibration of a drilling component such as the drill bit and/or the bottom hole assembly (BHA) along the X, Y and Z axes. The lateral acceleration is measured along either the X or Y axis and then analyzed in the frequency domain as to peak frequency and magnitude at such peak frequency. Backward whirling of the drilling component is indicated when the magnitude at the peak frequency exceeds a predetermined value. A low whirling frequency accompanied by a high acceleration magnitude based on empirically established values is associated with destructive vibration of the drilling component. One or more drilling parameters (weight on bit, rotary speed, etc.) is then altered to reduce or eliminate such destructive vibration.
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Baroid Technology Inc.
Brock Michael
Politzer Jay L.
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