Standard gravel packing equipment requires precise manipulation of downhole tools to direct fluid flow as desired. Floating vessels present a particular problem because the tools are generally positioned with the workstring in full tension suspended by the elevators. Without a stationary rotary table from which to measure, finding and holding each position becomes impossible when wave heights exceed a few feet. A specially designed set of gravel packing tools has been developed that allows accurate downhole positioning from all types of floating vessels.

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