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Push pill volumes should at least be equal to a volume of 300 ft of work string-casing annulus and have the same density as the drill-in fluid and a yield point that is 1.5 to 2.0 times that of the drill-in fluid. Thus, they are easily made from a portion of the drill-in mud by the addition of a viscosifier to raise the yield point. Casing sweeps depend on the chemical employed to remove solids and polymer and, to be effective, will require some contact time at turbulent rates. Calcium hypochlorite (65% active) at 1.5 lbm/bbl and a 5-min contact time effectively removes polymers and fluid-loss agents. | Push pill volumes should at least be equal to a volume of 300 ft of work string-casing annulus and have the same density as the drill-in fluid and a [[Glossary:Yield point|yield point]] that is 1.5 to 2.0 times that of the drill-in fluid. Thus, they are easily made from a portion of the drill-in mud by the addition of a viscosifier to raise the [[Glossary:Yield point|yield point]]. Casing sweeps depend on the chemical employed to remove solids and polymer and, to be effective, will require some contact time at turbulent rates. Calcium hypochlorite (65% active) at 1.5 lbm/bbl and a 5-min contact time effectively removes polymers and fluid-loss agents. | ||
===Open hole=== | ===Open hole=== | ||
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