FIELD: drilling fluids. SUBSTANCE: low-cost drilling mud containing 5% bentonite clay powder, 0.005- 0.05% water-soluble polymer, and water show apparent-viscosity property, reduced permafrost-thaw ability even at positive temperatures and at low consumption of regents. EFFECT: improved working characteristics. 1 tbl
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Authors
Dates
2002-07-10—Published
2001-02-20—Filed