Wells – Processes – Cleaning or unloading well
Patent
1983-01-24
1984-10-02
Suchfield, George A.
Wells
Processes
Cleaning or unloading well
252 855B, E21B 2114
Patent
active
044742401
ABSTRACT:
A process for eliminating drilling fluid (mud, solids and oil) from a well system prior to introduction of solids-free completion and packer brine. Drilling fluid is displaced by circulating through well pipe and annulus of a treated water (surfactant and alcohol) to complete removal of drilling fluid. A plug of a gelled aqueous spacer may be used before or after the treated water. The plug spacer is displaced from the well system by the following treated water or circulating therein of the solids-free brine. The spacer isolates efficiently the treated water from the displaced drilling fluid or the displacing brine. If the drilling fluid is inverted, the spacer can be an inverted gel of bentone, water and diesel oil.
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Oliver, Jr. John E.
Singer Arnold M.
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