Lost circulation material for sealing permeable formations

Details Lost circulation material for sealing permeable formations Lost circulation material for sealing permeable formations

C - Chemistry, Metallurgy

09

K

31/26

C09K 8/04 (2006.01) C09K 8/32 (2006.01)

Patent

CA 1170822

ABSTRACT OF THE DISCLOSURE A composition of matter and a method of making is provided for preparing slurries to seal permeable earth formations encountered in the drilling of wells. The composition of matter comprises finely divided paper, diatomaceous earth, and in a further embodiment, lime. Slurries of the composition of matter can be prepared using fresh water or salt water to form a water-based lost circulation fluid, or using oil to form an oil- based lost circulation fluid. A slug of the slurry is spotted at the locus of the permeable formation and defluidized to form a formation seal on which a mud sheath is then deposited.

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