Billy H Chesser

US Patent:

56020830, Feb 11, 1997

Filed:

Mar 31, 1995

Appl. No.:

8/414482

Inventors:

Allen Gabrysch - Houston TX
Billy G. Chesser - Spring TX

Assignee:

Baker Hughes Inc. - Houston TX

International Classification:

E21B 4300
E21B 33138
E21B 43267

US Classification:

507200

Abstract:

An oil-based fluid system has been discovered using a distribution of salt particle sizes, an oil or water/oil emulsion, a suspending agent for suspending the salt particles in the oil and a filtration control agent. It is important that the salt particles be distributed across a wide size range to effectively prevent filtration or fluid loss into the formation. Since the filter cake particles do not invade the well bore, no high pressure spike occurs during the removal of the filter cake. This high pressure spike indicates damage to the formation and well bore surface, which damage typically reduces overall permeability of the formation. The rheological properties of the fluid allow it to be used in a number of applications where protection of the original permeable formation is desirable. The applications include, but are not limited to, drilling fracturing and controlling fluid losses during completion operations, such as gravel packing or well bore workovers.

US Patent:

59197382, Jul 6, 1999

Filed:

Mar 25, 1997

Appl. No.:

8/823851

Inventors:

James E. Norfleet - Houston TX
Michael A. Jarrett - Houston TX
William M. Dye - Houston TX
Dennis K. Clapper - Houston TX
Geoffrey Robinson - Spring TX
Ronald G. Bland - Houston TX
John B. Weirich - Spring TX
Billy G. Chesser - Onalaska TX

Assignee:

Baker Hughes Incorporated - Houston TX

International Classification:

C09K 702

US Classification:

507136

Abstract:

The present invention provides a method of preparing a fluid for use in drilling and completion operations comprising mixing a fluid comprising a salt of an alkaline earth metal with a nonionic colloid-forming material in an amount and under conditions sufficient to convert a majority of said nonionic colloid-forming material into water insoluble hydrated colloidal complexes comprising hydrated ions of said alkaline earth metal complexed with said nonionic colloid-forming material, said complexes being effective to improve a property of said fluid selected from the group consisting of rheology, fluid loss control, and a combination thereof.