Exxon Production Research Company

Lawrence P Krolikowski

Terry N Gardner

James N Brekke

Raymond E Dextraze

A vibration-isolating apparatus for protecting equipment from excessive vibrations. The apparatus discloses an equipment-carrying frame attached by shock-absorbing members to a guide member. The guide member is loosely fastened in operational relationship wth a drillpipe or casing to permit movement of the apparatus. The apparatus is lowered along the drillpipe or casing by a cable or other locomotive means controlled from the surface. Vibration of the drillpipe created by ocean currents or waveloading forces causes the drillpipe to impact and vibrate the guide member of the apparatus. The shock-absorbing members protect equipment attached to the frame by attenuating the excessive vibrations induced by the drillpipe on the apparatus. Shock-absorbing members of varying stiffness can be substituted to attenuate the differing vibrational forces exerted by each particular drillpipe. The stiffness of the shock-absorbing members is preferably selected to provide the optimal combination of rigidity and damping properties necessary to protect the equipment.

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Houston, TX, United States of America

Lawrence P Krolikowski