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High temperature well cementing with low grade blast furnace slag

  • US 5,379,840 A
  • Filed: 08/19/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 08/19/1993
  • Status: Expired due to Term
First Claim
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1. A method of drilling and cementing comprising:

  • drilling a borehole with a drill string utilizing a drilling fluid, thus producing a used drilling fluid;

    removing said drill string and disposing a pipe within said borehole, a portion of said used drilling fluid being disposed in said pipe and in an annulus surrounding said pipe;

    combining ingredients comprising blast furnace slag having a slag activity index of less than 100 and water to produce a cementitious slurry;

    introducing said cementitious slurry into said pipe; and

    displacing said cementitious slurry into said annulus wherein said cementitious slurry encounters a temperature in the range of 150°

    -250°

    F.

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