| 摘要 |
<p>METHOD FOR CONTROLLING BOTTOM WATER CONING IN PRODUCING OIL WELL Disclosed herein is a method of treating a producing oil well completed in an oil containing formation overlying and in contact with a water containing formation, said well having communication means with at least a portion of the oil formation, to form a barrier below the communication means of said well to prevent water moving upward from the underlying water containing formation into the well which comprises the steps of: determining the specific gravity of the water or brine occupying the permeable formation underlying the oil formation. forming an acid solution capable of extracting metal ions from the formation structure, 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 underlying formation; injecting said weighted acid solution through the well into the formation; forming an acidified resin emulsion composition comprising a hydrocarbon resin, acidified water and acid stable surfactant, which resin emulsion is susceptible to demulsification on contact with a sufficient concentration of polyvalent metal ions, and also containing an amount of soluble nonionic solid material such as sucrose or other sugar sufficient to raise the density of the acidified resin emulsion composition to a value greater than the density of the aqueous fluid in the underlying formation; and introducing said acidified resin emulsion composition through the well into the formation at a predetermined injection rate, whereupon the resin emulsion demulsifies in a region of the formation below the perforations of the wellbore, said region containing extractable polyvalent metal ions, said demulsification being effected to establish an area having greatly reduced permeability to fluid flow over a relatively long period of time.</p> |
