Flat rheology drilling fluids

Details Flat rheology drilling fluids Flat rheology drilling fluids

2006-12-05

2008-12-09

Kugel, Timothy J (Department: 1796)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

C166S244100, C166S305100, C166S369000, C175S065000, C507S103000, C516S053000

Reexamination Certificate

active

07462580

ABSTRACT:
Methods for drilling, running casing in, and/or cementing a borehole in a subterranean formation without significant loss of drilling fluid are disclosed, as well as compositions for use in such methods. The methods employ drilling fluids comprising fragile gels or having fragile gel behavior and providing superior oil mud rheology and overall performance. The fluids are especially advantageous for use in offshore wells because the fluids exhibit minimal differences between downhole equivalent circulating densities and surface densities notwithstanding differences in drilling or penetration rates. When an ester and isomerized olefin blend is used for the base of the fluids, the fluids make environmentally acceptable and regulatory compliant invert emulsion drilling fluids.

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