Wells – Processes – Cleaning or unloading well
Patent
1993-12-10
1994-11-22
Suchfield, George A.
Wells
Processes
Cleaning or unloading well
1663051, E21B 3700, E21B 4328
Patent
active
053660161
ABSTRACT:
A method to improve the efficiency of scale dissolution in a formation containing multiple productive intervals where variable density liquids are utilized. Initially, a liquid composition sufficient to solubilize an alkaline-earth metal sulfate scale deposit is directed into a wellbore thereby contacting scale in one productive interval of the formation. Thereafter, a second scale solubilizing liquid having a density of about 0.1 wt % less than the first liquid is directed into the wellbore thereby contacting additional perforations and a higher interval. These scale solubilizing liquids with varying densities are allowed to remain in contact with perforations and productive intervals communicating therewith for a time sufficient to solubilize the scale deposit thereby efficiently removing said scale deposit from perforations and productive intervals at two different levels.
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Fieler Eleanor R.
Jennings, Jr. Alfred R.
Paul James M.
Hager Jr. George W.
Malone Charles A.
McKillop Alexander J.
Mobil Oil Corporation
Suchfield George A.
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