Methods of reducing fluid loss and polymer concentration of well

Details Methods of reducing fluid loss and polymer concentration of well Methods of reducing fluid loss and polymer concentration of well

1994-03-25

1997-05-13

Tucker, Philip

Earth boring, well treating, and oil field chemistry

Well treating

Contains inorganic component other than water or clay

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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