Wells – Processes – Cementing – plugging or consolidating
Patent
1986-01-06
1987-05-05
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166281, 166300, E21B 33138
Patent
active
046624490
ABSTRACT:
Disclosed is a method of treating an oil well completed in an oil formation overlying and in contact with a water formation to form a barrier below the communications of the well to prevent water moving upward from the underlying water containing formation into the well.
An acid solution capable of extracting metal ions from the formation is prepared, having dissolved therein sufficient nonionic soluble solids such as sucrose or other sugar to raise the density of the acid solution to a value greater than the density of the aqueous fluid in the formation.
The weighted acid solution is injected through the well into the formation.
An acidified resin emulsion comprising a hydrocarbon resin, acidified water and acid stable surfactant, is formulated using a resin emulsion which is susceptible to demulsification on contact with polyvalent metal ions. Sufficient soluble nonionic solid material such as sucrose or other sugar is added to the emulsion to raise its density to a value greater than the density of the aqueous fluid in the underlying formation.
The acidified resin emulsion is injected into the formation whereupon the resin emulsion demulsifies in the formation below the perforations of the wellbore. Since the region contains extractable polyvalent metal ions, demulsification occurs to establish an area having greatly reduced permeability.
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Kisliuk Bruce M.
Novosad Stephen J.
Park Jack H.
Priem Kenneth R.
Texaco Inc.
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