Texas United Chemical Company, LLC

Texas United Chemical Corp.

Jesse Clark Harrison, Iii

James W Dobson, Jr

Herman Mathieu Muijs

Paul D Kayga

The invention provides solids-free, viscous fluids (pills) for use in various well workover and completion operations including as displacement spacer pills, standard fluid loss control pills, post gravel pack in-screen pills, perforation sealing, and the like. The pills comprise a viscous solution of a polyethylene glycol having a molecular weight of 1,000 to 8,000,000 in an aqueous liquid comprising a solution of one or more soluble bromide salts having a density sufficient to provide the desired hydrostatic pressure at the location of use of the fluid in a well. The minimum concentration of the polyethylene glycol in the pill varies with the average molecular weight as follows: MW&equals;1,000 to 10,000&equals;100 ppb; MW&equals;10,001 to 100,000&equals;75 ppb; MW&equals;100,001 to 250,000&equals;50 ppb; MW&equals;250,001 to 500,000&equals;10 ppb; MW&equals;500,001 to 8,000,000&equals;5 ppb.

Method of decreasing the loss of fluid during workover and completion operations

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.

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Houston, TX, United States of America

Jesse Clark Harrison, Iii