In this procedure, the hole is 'topped up' at regular intervals using a fill-up line, and the required mud volume is then noted. Typically this will be done after every five stands of drill pipe, and after every stand of drill collars. This may be stretched, depending on circumstances, to one fill-up every ten stands of drill pipe or two stands of drill collars.
The mud volume added may be calculated either by noting the number of pump strokes required from a pump of known displacement, or by pumping mud from a trip-tank, with a direct reading of mud volume available on the drill floor. Ideally the trip tank will be a tall narrow tank, so that a small volume change shows up as a large change in mud level.
The advantage of the fill-up method is that at regular intervals, attention is being drawn to the mud to check hole volumes and a routine is established. Its main possible drawback is that other hole problems or rig requirements may disrupt the trip routine (rhythm) and hence attention from the need to fill up the hole.
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