另外还要挑战紧公差段、尽量避免泥浆漏失，同时避免泥浆泄露至钻台。
Additional challenges included running through tight tolerances, minimizing mud losses, and avoiding mud spills on the rig floor.
较薄部位、抛光表面和紧公差除垢时，应特别小心，避免人工方法损伤表面。
Particular care must be taken to avoid damage by manual methods when descaling thin section polished surfaces and close tolerance parts.
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