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    Biodegradable set retarder for a cement composition
    6.
    发明授权
    Biodegradable set retarder for a cement composition 有权
    用于水泥组合物的可生物降解的阻滞剂

    公开(公告)号：US08869895B2

    公开(公告)日：2014-10-28

    申请号：US12633507

    申请日：2009-12-08

    申请人： Girish Dinkar Sarap ,  Sandip Prabhakar Patil ,  Dibyadarshani Senapati ,  Abhijit Tarafdar

    发明人： Girish Dinkar Sarap ,  Sandip Prabhakar Patil ,  Dibyadarshani Senapati ,  Abhijit Tarafdar

    IPC分类号： E21B33/13 ,  C09K8/00 ,  C04B14/00

    CPC分类号： C04B24/2641 ,  C04B24/2652 ,  C04B24/2664 ,  C04B24/383 ,  C04B28/02 ,  C04B2103/0046 ,  C04B2103/0053 ,  C04B2103/006 ,  C04B2103/22 ,  C09K8/428 ,  C09K8/467 ,  C04B22/0026

    摘要： Compositions and methods are directed to a cement composition for use in a subterranean formation. In an embodiment the cement composition comprises: (A) cement; (B) water; and (C) a polymer, wherein the polymer: (i) consists essentially of a monomer or monomers selected from the group consisting of acrylic acid, esters of acrylic acid, maleic acid, methacrylic acid, esters of methacrylic acid, itaconic acid, fumeric acid, citraconic acid, mesoconic acid, and any alkali metal, alkaline earth metal, or ammonium salt of any of the foregoing, and any combination of any of the foregoing; (ii) has the following characteristics: (a) is water soluble; and (b) is biodegradable; and (iii) is capable of providing: (a) a thickening time of at least 2 hours for a test composition maintained under a temperature condition of 190° F. and a pressure of 5,160 psi; and (b) an initial setting time of less than 24 hours for the test composition maintained under a temperature condition of 217° F. and a pressure of 3,000 psi, wherein the test composition consists of 860 grams of Class-H Portland cement, 325 grams of deionized water, and 0.4% by weight of the cement of the polymer. In another embodiment the method comprises the steps of: (A) introducing the cement composition into the subterranean formation; and (B) allowing the cement composition to set after introduction into the subterranean formation.

    摘要翻译： 组合物和方法涉及用于地下地层的水泥组合物。 在一个实施方案中，水泥组合物包含：（A）水泥; （B）水; 和（C）聚合物，其中聚合物：（i）基本上由选自丙烯酸，丙烯酸的酯，马来酸，甲基丙烯酸，甲基丙烯酸的酯，衣康酸，数字的单体或单体组成 酸，柠康酸，中糖酸，以及任何上述任何一种的碱金属，碱土金属或铵盐，以及任何前述的任何组合; （ii）具有以下特征：（a）是水溶性的; 和（b）是可生物降解的; 和（iii）能够提供：（a）在190°F的温度条件和5,160psi的压力下保持的测试组合物的至少2小时的增稠时间; 和（b）在217°F的温度条件下保持的测试组合物的初始凝固时间小于24小时，并且压力为3,000psi，其中测试组合物由860克H类波特兰水泥，325 克的去离子水和0.4重量％的聚合物的水泥。 在另一个实施方案中，该方法包括以下步骤：（A）将水泥组合物引入地层; 和（B）允许水泥组合物在引入地层之后凝固。