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Use of cmc in drilling fluids

  • US 20070135311A1
  • Filed: 10/15/2004
  • Published: 06/14/2007
  • Est. Priority Date: 10/17/2003
  • Status: Active Grant
First Claim
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1. A water-based drilling fluid composition comprising water and a carboxymethyl cellulose (CMC), wherein the CMC is characterized by forming a gel at 25°

  • C. after high-shear dissolution in a 0.3 wt % aqueous sodium chloride solution, the final content of the CMC in the aqueous sodium chloride solution being 1 wt % for a CMC having a degree of polymerization (DP) of >

    4,000, 1.5 wt % for a CMC having a DP of 3,000-4,000, 2 wt % for a CMC having a DP of 1,500-<

    3,000, and 4 wt % for a CMC having a DP of <

    1,500, the gel being a fluid having a storage modulus (G′

    ) which exceeds the loss modulus (G″

    ) over the entire frequency region of 0.01-10 Hz when measured on an oscillatory rheometer operating at a strain of 0.2.

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