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Composition and method of controlling lost circulation from wellbores

  • US 4,836,940 A
  • Filed: 09/14/1987
  • Issued: 06/06/1989
  • Est. Priority Date: 09/14/1987
  • Status: Expired due to Fees
First Claim
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1. A composition for preventing and/or counteracting the lost circulation of a drilling mud comprising pellets of a homogeneous mixture of a water-swellable bentonite and a water-insoluble, water-absorbent cross-linked polyacrylate, wherein the weight ratio of the bentonite to the water-absorbent polymer ranges from about 1:

  • 3 to about 3;

    1.

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