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Method of using thixotropic cements for combating gas migration problems

  • US 4,524,828 A
  • Filed: 10/11/1983
  • Issued: 06/25/1985
  • Est. Priority Date: 10/11/1983
  • Status: Expired due to Term
First Claim
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1. A method for cementing a zone under pressure comprising pumping a thixotropic cement slurry into said zone, terminating pumping, and allowing said static slurry to set, wherein said slurry comprises water, hydraulic cement, a crosslinking agent selected from the group consisting of titanium chelates and a crosslinkable agent selected from the group consisting of water-soluble cellulose ethers;

  • polyvinyl alcohol;

    homopolymers, copolymers and terpolymers of AMPS (2-acrylamido-2-methylpropane sulfonic acid), sodium vinylsulfonate, acrylamide N,N-dimethylacrylamide and acrylic acid; and

    mixtures thereof, whereby said slurry develops static gel strength in an amount sufficient to prevent fluid migration during some time after the pumping has terminated and until the cement slurry has set.

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