Wells – Processes – Specific low fluid loss feature for fluid attacking formation
Reexamination Certificate
2011-06-28
2011-06-28
Bates, Zakiya W (Department: 3676)
Wells
Processes
Specific low fluid loss feature for fluid attacking formation
C166S305100, C166S300000
Reexamination Certificate
active
07967068
ABSTRACT:
Fluids viscosified with viscoelastic surfactants (VESs) may have their fluid loss properties improved with the presence of at least one mineral oil in combination with at least one particulate fluid loss control agent that may be an alkaline earth metal oxides, alkaline earth metal hydroxides, transition metal oxides, transition metal hydroxides, and mixtures thereof. The mineral oil may initially be dispersed oil droplets in an internal, discontinuous phase of the fluid. In one non-limiting embodiment, the mineral oil is added to the fluid after it has been substantially gelled. The particulate fluid loss control agent may be added in any order relative to the VES and the mineral oil fluid loss control agent. The mineral oil may enhance the ability of a particulate fluid loss control agent to reduce fluid loss. The presence of the mineral oil may also eventually reduce the viscosity of the VES-gelled aqueous fluid.
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Crews James B.
Huang Tianping
Baker Hughes Incorporated
Bates Zakiya W
Ditrani Angela M
Mossman Kumar & Tyler PC
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