Wells – Processes – Separate steps of fracturing or attacking formation
Reexamination Certificate
2011-08-09
2011-08-09
Suchfield, George (Department: 3676)
Wells
Processes
Separate steps of fracturing or attacking formation
C166S282000, C166S300000, C166S307000, C507S203000, C507S245000, C507S260000, C507S265000, C507S921000
Reexamination Certificate
active
07992640
ABSTRACT:
An aqueous fluid system that contains an aqueous dicarboxylic acid solution, a viscoelastic surfactant as a gelling agent to increase the viscosity of the fluid, and an internal breaker such as mineral oil and/or fish oil to controllably break the viscosity of the fluid provides a self-diverting acid treatment of subterranean formations. The internal breaker may be at least one mineral oil, a polyalphaolefin oil, a saturated fatty acid, and/or is an unsaturated fatty acid. The VES gelling agent does not yield viscosity until the organic acid starts to spend. Full viscosity yield of the VES gelling agent typically occurs at about 6.0 pH. The internal breaker allows the VES gelling agent to fully viscosify the spent organic acid at 6.0 pH and higher, but as the spent-acid VES gelled fluid reaching reservoir temperature, controllable break of the VES fluid viscosity over time can be achieved.
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Crews James B.
Huang Tianping
Baker Hughes Incorporated
Mossman Kumar & Tyler PC
Suchfield George
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