| 摘要 |
A low drag flotation system for placing screens in horizontal wells is provided which includes a screen exterior to the washpipe to be placed for sand control, and hydraulically actuated valves for trapping air within the washpipe. The air in the washpipe creates a buoyancy force that decreases the drag force of the pipe string in the horizontal well, allowing it to move further down the well under its own weight. As a result, screens can be placed in longer lengths of horizontal wells to maximize oil and gas production.
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