Active vibration damper for downhole drilling

Structurally, the AVD is similar to a shock-sub, with the addition of a damper section that has programmable stiffness. The damper chamber is filled with a magnetorheological fluid that has electronically controlled viscosity. An integrated motion sensor measures displacement several times per second and changes the damping factor over a 7-to-1 range based on observed drilling conditions.

By keeping tool string damping in the right range for current drilling conditions, the AVD significantly reduces vibration, maintaining the bit in better contact with the formation and increasing ROP.

FEATURES & BENEFITS

  • Self-contained drilling tool with no calibration or other rig maintenance required.
  • Records vibration data for later download.
  • Lower costs
  • Optimize drilling parameters by reducing stick slip, vibrations & whirl
  • Extend bit & drilling tool life
  • The AVD may be located directly above the drilling motor, drill collars or above/in the BHA assembly
  • The AVD tool dampens the vibration, whereas the standard bevel spring shock sub is a vibration carrier
  • Improve overall rate of penetration
  • Adapt to a continuously changing environment

Design

  • Tool Size: 7.00 in. or 9.50 in. (178 mm or 241 mm) O.D.; 1.89 in. (48 mm) I.D. for 6.75 in. and 7.00 in. O.D., 3.00 in. (76 mm) I.D. for 9.50 in. O.D.
  • Structurally similar to a shock-sub, with the addition of a damper section that has programmable stiffness.
AVD Tool Technical Sheet
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For any questions, please ask for
Klaus Magnus Wergeland
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References

CAPPING STACK

PSW Group offer a Capping Stack & related services and equipment as part of the Norwegian Oil & Gas emergency response plan. The capping stack is stored at PSW Group's facilities at Mongstad and can be ready at quayside within 24 hours of notification.

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