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    Composition for inhibiting scale formation in oil well brines
    9.
    发明授权
    Composition for inhibiting scale formation in oil well brines 失效
    用于抑制油井中的鳞屑形成的组合物

    公开(公告)号：US3827977A

    公开(公告)日：1974-08-06

    申请号：US29424972

    申请日：1972-10-02

    申请人： ATLANTIC RICHFIELD CO

    发明人： MILES L ,  KING G

    IPC分类号： C02F5/12 ,  C09K8/528 ,  C10M5/12

    CPC分类号： C09K8/528 ,  C02F5/125 ,  Y10S507/927

    摘要： A METHOD FOR INTRODUCING AN INHIBITORM E.G., AN INHIBITOR AGAINST SCALE FORMATION, INTO OIL WELL BRINES IS DISCLOSED. THIS METHOD COMPRISES INTRODUCING INTO THE POROUS RESERVOIR STRUCTURE, I.E., OIL-BEARING FORMATION ADJACENT TO THE BORE OF AN OIL WELL A RELATIVELY WATER OR BRINE INSOLUBLE POLYVALENT METAL SALT OF THE INHIBITOR, E.G., POLYACRYLIC ACID AND/OR HYDROLYZED POLYACRYLAMIDE, THE POLYACRYLIC ACID HAVING A MOLECULAR WEIGHT RANGE OF ABOUT 17,000 TO 50,000, AND THE HYDROLYZED POLYACRYLAMIDE HAVING FROM ABOUT 10% TO 50% UNHYDROLYZED AMIDE GROUP AND A MOLECULAR WEIGHT OF ABOUT 1,000 TO 8,000, IN WHICH THE METAL IS SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH METALS, ZN++. CU++, PB++, FE+++, CR+++, AND AL+++. THE METHOD COMPRISES IN SITU FORMATION OF THE RELATIVELY WATER OR BRINE INSOLUBLE POLYVALENT METAL SALT OF THE INHIBITOR E.G., POLYACRYLIC ACID AND/OR HYDROLYZED POLYACRYLAMIDE, IN THE RESERVOIR STRUCTURE BY INTRODUCING INTO THE POROUS STRUCTURE A WATER-SOLUBLE SALT OF THE INHIBITOR, E.G., THE SODIUM SALT OF THE POLYACRLIC ACID AND/ OR HYDROLYZED POLYACRYLAMIDE, AND A WATER-SOLUBLE SALT OR THE POLYVALENT METAL IN A STRONG ACID IN SOLUTION LUTION. IN THE IN SITU METHOD TSTRONGLY ACIDIC, AQIN SOLUTION INITIALLY INHIBITS REACTION OF THE SALTS BUT IS DISSIPATED BY THE FLUIDS IN THE OIL-BEARING FORMATION AND NEUTRALIZED BY THE FORMATION ROCK TO ALLOW REACTION AND FORMATION OF THE DESIRED WATER-SOLUBLE METAL SALT OF POLYACRYLIC ACID AND/ OR HYDROLYZED POLYACRYLAMIDE IN THE FORMATION.