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AssigneeTexas United Chemical Company, LLC.
InventorsJames W. Dobson, Jr., Paul D. Kayga, Jesse C. Harrison, III
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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.
A method of reducing the fluid loss of well drilling and servicing fluids which contain at least one polymeric viscosifier, at least one polymeric fluid loss control additive, and a water soluble salt bridging agent suspended in a saturated salt solution in which the bridging agent is not soluble, which comprises adding to the fluid a particulate, water soluble, ultra fine salt 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, wherein the concentration of the ultra fine filtrate reducing agent is sufficient to reduce the fluid loss of the fluid.
A method of providing a desired degree of fluid loss control to a well drilling and servicing fluid which contains at least one polymeric viscosifier, and a water soluble salt bridging agent suspended in a saturated solution in which the bridging agent is not soluble, which comprises adding to the fluid at least one polymeric fluid loss control additive and a particulate, water soluble, ultra fine salt 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, wherein the concentration of the polymeric fluid loss control additive is less than the concentration which would be required to provide the desired degree of fluid loss control in the absence of the ultra fine salt filtrate reducing agent.
Dependencies are inferred from the claim text.