Charles F Bell

US Patent:

8371383, Feb 12, 2013

Filed:

Dec 18, 2009

Appl. No.:

12/642662

Inventors:

Charles Elmer Bell - Rockwall TX, US
Harold Dean Brannon - Magnolia TX, US

Assignee:

Baker Hughes Incorporated - Houston TX

International Classification:

E21B 43/25
E21B 43/26
E21B 43/267
C09K 8/68

US Classification:

166300, 1663051, 1663083, 1663085, 507903, 507904, 507922

Abstract:

Subterranean formations, such as tight gas formations, may be subjected to hydraulic fracturing by introducing into the formation a fracturing fluid of an aqueous fluid, a hydratable polymer, a crosslinking agent and proppant. The fracturing fluid is prepared in a blender and then pumped from the blender into the wellbore which penetrates the formation. The fluid enters the reservoir through an entrance site. The apparent viscosity of the fluid decreases distally from the entrance site such that at least one of the following conditions prevails at in situ conditions:.