Alert 14 – 04 Blocks Fall to Rig Floor After Drill Line Came Off of the Drawworks


While rigging down the bridle assembly, the Driller was slacking off on the blocks in an attempt to lower the blocks and the bridle equalizer to the rig floor. In the process, the drilling line “dog knot” was pulled from the drum. This allowed the blocks to free-fall approximately 20 feet (6 meters), striking the rig floor. During the free-fall, the “dog knot” was hung up in the braces and the fast line sheave, keeping the blocks from falling completely onto the floor. Fortunately there were no injuries.

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