Methods for using reversible phase oil-based drilling fluid

Details Methods for using reversible phase oil-based drilling fluid Methods for using reversible phase oil-based drilling fluid

2008-05-27

2008-05-27

Suchfield, George (Department: 3676)

Hydraulic and earth engineering

Subterranean waste disposal, containment, or treatment

Earthen formation

C134S025100, C175S066000, C507S129000, C507S131000, C588S250000

Reexamination Certificate

active

11621788

ABSTRACT:
Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil-in-water type emulsion upon the protonation of the amine surfactant. Deprotonation of the amine surfactant reverses the conversion. This solution also permits the conversion of oil-wet solids in the fluid into water-wet solids.

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