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    Cementing boreholes using salt-containing cement compositions
    73.
    发明公开
    Cementing boreholes using salt-containing cement compositions 失效
    使用含盐水泥组合物来制备内孔

    公开(公告)号：EP0217608A3

    公开(公告)日：1988-05-04

    申请号：EP86307232

    申请日：1986-09-19

    申请人： HALLIBURTON COMPANY

    发明人： Brothers, Lance Everett

    IPC分类号： E21B33/13 ,  C04B28/02

    CPC分类号： C04B24/163 ,  C04B28/02 ,  C04B2103/46 ,  C09K8/487 ,  C04B24/383

    摘要： A method of cementing a conduit in a borehole penetrating an earthen formation, by introducing a salt-tolerant cementing composition into the space between said conduit and said formation, wherein the cementing composition comprises cement and:
    (a) water containing in excess of about 10% salt by weight of the water, and (b) a fluid loss additive comprising an admixture of: (i) at least one member selected from carboxymethylhydroxyethylcellulose and copolymers or copolymer salts of N,N-dimethylacrylamide and 2-acrylamido-2-methylpropane sulfonic acid or acid salts thereof, having a mole ratio from about 1:4 to about 4:1 and a molecular weight such that a 0.1% aqueous solution of said copolymer has a Brookfield viscosity reading at 5 rpm of the U.L. Adapter Spindle in the range of about 30 to about 250 centipoise (.03 to .25 Pa s). present in an amount of from about 0.1% to about 1.0% by weight of dry cement; and (ii) a copolymer or copolymer salt of acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid or acid salt thereof, having a mole ratio of from about 1:5to about 5:1 and a molecular weight such that a 10% aqueous solution of said copolymer has a Brookfield viscosity reading at 20 rpm of the U.L. Adapter Spindle in the range of about 5 to about 50 centipoise (.005 to .05 Pa s), present in an amount of from about 0.1% to about 3.0% by weight of dry cement.

    Sulfonated poly(vinyl aromatics) as fluid loss control additives for salt cement slurries
    74.
    发明公开
    Sulfonated poly(vinyl aromatics) as fluid loss control additives for salt cement slurries 失效
    磺化聚（乙烯基芳烃）作为添加剂用于盐水泥浆的流体损失控制。

    公开(公告)号：EP0196683A1

    公开(公告)日：1986-10-08

    申请号：EP86200155.9

    申请日：1986-02-05

    申请人： DOWELL-SCHLUMBERGER INCORPORATED

    发明人： Nelson, Erik B.

    IPC分类号： C04B24/22 ,  E21B33/13

    CPC分类号： C09K8/487 ,  C04B24/22 ,  C04B28/02 ,  C04B2103/46 ,  C09K8/46 ,  C04B22/08 ,  C04B24/18

    摘要： A salt water hydraulic cement slurry and method of use in oil and gas well cement jobs involving a novel fluid loss additive comprising an admixture of sulfonated aromatic polymers. An effective amount of an admixture of water soluble salts of a sulfonated styrene/maleic anhydride copolymer, sulfonated polystyrene, sulfonated polyvinyltoluene and sulfonated polynaphthalene/formaldehyde condensate when added to a salt water/Portland cement slurry provides fluid loss control to the Portland cement slurry at bottomhole circulating temperature between 80° and 210°F. Further, addition of and/or the replacement of the sulfonated polystyrene by a water soluble lignosulfonate further enhances the high tempeature properties of the salt water cement slurry.
    One exception to this appears in British patent 2,080,812 which describes the use of very low molecular weight carboxymethylhydroxyethylcellulose polymers in combination with hydroxycarboxy acids as fluid loss additives for salt water cement slurries.