Drilling with low viscosity fluids

Details Drilling with low viscosity fluids Drilling with low viscosity fluids

1973-09-10

1976-04-06

Guynn, Herbert B.

Compositions

Leather or fur treating

175 65, 252 85C, C09K 702

Patent

active

039487822

ABSTRACT:
An improved method of drilling a well is effected by circulating in the well a drilling fluid containing lamellar micelles at flow rates predetermined to produce retro-viscous behavior in the drilling fluid at noncryogenic temperatures. The composition contains 4-15% surfactant (preferably petroleum sulfonate having an average equivalent weight of 350-525), 30-70% liquid hydrocarbon, 15-66% water and optionally up to 20% cosurfactant (preferably an alcohol containing 1-20 carbon atoms) and/or electrolyte (preferably inorganic salt) and the micelles have an axial ratio of at least 3.5. Preferably, the composition has a viscosity of at least 75 cp at a shear rate of 10.sup.-.sup.1 seconds at 23.degree.C. The composition is substantially optically clear, phase stable, birefrigent, and the flow properties are such that substantially large increases in flow rates, e.g., 20-fold, can be realized at very small pressure increases, e.g., 5%. Additional additives to impart desired drilling properties can be included with the composition.

REFERENCES:
patent: 3275075 (1966-09-01), Gogarty et al.
patent: 3472769 (1969-10-01), Lummus et al.
patent: 3734856 (1973-05-01), Son
patent: 3752763 (1973-08-01), Kablaoui et al.
patent: 3822746 (1974-07-01), Gogarty

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