Methods of reducing fluid loss and polymer concentration of well

Earth boring – well treating – and oil field chemistry – Well treating – Contains inorganic component other than water or clay

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Details

507140, 507141, 507145, 507276, 507277, 507906, 166278, 166292, C09K 700, E21B 4304

Patent

active

056292716

ABSTRACT:
The invention provides methods for (1) reducing the fluid loss of and (2) reducing the concentration of polymer required to provide a desired degree of fluid loss control to, a well drilling and servicing fluid which contains at least one polymeric viscosifier, at least one polymeric fluid loss control additive, and a water soluble bridging agent suspended in an a liquid in which the bridging agent is not soluble, the methods comprising adding to the fluids a particulate, water soluble, ultra fine filtrate reducing agent having a particle size distribution such that at least 90% of the particles thereof are less than 10 micrometers and the average particle size is from about 3 to about 5 micrometers, the ultra fine filtrate reducing agent being insoluble in the liquid.

REFERENCES:
patent: 4046197 (1977-09-01), Gruesbeck
patent: 4192756 (1980-03-01), Mondshine
patent: 4621692 (1986-11-01), Mondshine

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