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Low temperature set retarded well cement compositions and methods

  • US 5,472,051 A
  • Filed: 11/18/1994
  • Issued: 12/05/1995
  • Est. Priority Date: 11/18/1994
  • Status: Expired due to Fees
First Claim
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1. An improved method of cementing a subterranean zone penetrated by a well bore at temperatures below about 170°

  • F. comprising the steps of;

    preparing a set retarded cement composition comprising a hydraulic cement, water and a set retarding additive, said set retarding additive being comprised of a copolymer consisting essentially of 2-acrylamido-2-methylpropane sulfonic acid in an amount in the range of from about 65 to about 85 mole percent and acrylic acid in an amount in the range of from about 15 to about 35 mole percent and having an average molecular weight below about 5000;

    placing said cement composition into said subterranean zone by way of said well bore; and

    allowing said cement composition to set in said zone.

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