发明授权
- 专利标题： Cement set retarding additives, compositions and methods
- 专利标题（中）： 水泥减阻添加剂，组合物和方法
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申请号： US241434申请日： 1994-05-11
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公开(公告)号： US5421881A公开(公告)日： 1995-06-06
- 发明人: Klein A. Rodrigues , Jiten Chatterji
- 申请人： Klein A. Rodrigues , Jiten Chatterji
- 申请人地址： OK Duncan
- 专利权人： Halliburton Company
- 当前专利权人： Halliburton Company
- 当前专利权人地址： OK Duncan
- 主分类号： C04B24/16
- IPC分类号： C04B24/16 ; C04B24/24 ; C04B24/30 ; C09K8/46
摘要：
The present invention provides set retarding additives, set retarded hydraulic cement compositions including such additives and methods of using the cement compositions for cementing zones in wells. The set retarding additives are graft copolymers or terpolymers comprised of the condensation polymer product of a ketone, aldehyde and a compound which introduces acid groups into the polymer having grafted thereto a monomer selected from the group consisting of acrylic acid, vinyl phosphonic acid, methacrylic acid, maleic acid and itaconic acid or one of the foregoing monomers and a second monomer of 2-acrylamido-2-methylpropane sulfonic acid.
公开/授权文献
- US4954644A Ruthenium-phosphine complex 公开/授权日：1990-09-04
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