Jesse C Harrison

US Patent:

63251493, Dec 4, 2001

Filed:

Feb 22, 2000

Appl. No.:

9/510320

Inventors:

James W. Dobson - Houston TX
Jesse Clark Harrison - Houston TX
Herman Mathieu Muijs - The Woodlands TX

Assignee:

Texas United Chemical Company, LLC. - Houston TX

International Classification:

E21B 4316

US Classification:

1663051

Abstract:

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=1,000 to 10,000=100 ppb; MW=10,001 to 100,000=75 ppb; MW=100,001 to 250,000=50 ppb; MW=250,001 to 500,000=10 ppb; MW=500,001 to 8,000,000=5 ppb.

US Patent:

56292716, May 13, 1997

Filed:

Mar 25, 1994

Appl. No.:

8/217726

Inventors:

James W. Dobson - Houston TX
Paul D. Kayga - Houston TX
Jesse C. Harrison - Houston TX

Assignee:

Texas United Chemical Corporation - Houston TX

International Classification:

C09K 700
E21B 4304

US Classification:

507269

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.