Ball sealers settling velocity

An important consideration in selecting the proper ball sealer is the settling velocity of the ball in the carrying fluid. The settling velocity of a ball sealer in a Newtonian fluid can be defined as follows ... 

Settling rate in 15% HCl, for example, can vary from about 24 feet per minute (ft/min) for a 1.1 s.g. ball to almost 90 ft/min for a 1.4 s.g. ball. For buoyant ball sealers, or floaters, the settling rate will be negative— meaning that the ball will rise, rather than sink or settle. In 15% HCl, a 0.9 s.g. ball will have a rise rate of about 65 ft/min, while the rise rate of a 1.0 s.g. ball would be about 42 ft/min. One benefit of using floaters is that the rise rate can usually be easily overcome. For example, in 2%" tubing, the velocity of acid movement at 1 bpm is 173 ft/min (5.615 cubic feet per minute divided... 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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