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</html><description>Many models in the industry use the notion of an effective length to make predictions about the bottom hole assembly (BHA), whether for its directional behavior or its lateral vibration tendency.</description><thumbnail_url>https://www.hpinc.com/wp-content/uploads/2025/07/SPE-217755-MS_600x400.jpg</thumbnail_url><thumbnail_width>600</thumbnail_width><thumbnail_height>400</thumbnail_height></oembed>
