FIELD: biochemistry.
SUBSTANCE: group of inventions relates to borehole fluids. Borehole fluid contains a synthetic oily liquid that is liquid at 25 °C, is substantially immiscible with water, has less than about 2 % aromatic compounds, is substantially linear and is prepared by a method comprising a Fischer-Tropsch reaction; an alkoxylated alcohol having the general formula: X-O-(CnH2nO)y-(C2H4O)z-H, where X is an organyl group, having from 3 to 40 carbon atoms, n is 2, 3 or 4, y is 0–6, and z is 3–20; organophilic clay.
EFFECT: technical result is an increase in the viscosity of a borehole fluid.
22 cl, 3 dwg, 3 ex, 4 tbl
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