Mist drilling fluid

Mist Drilling Fluid Mitchell Foam Quality Monodisperse... 

Chemical additives for gas-based drilling fluids are limited to surfactants (qv), certain polymers, and occasionally salts such as sodium or potassium chloride. An aqueous solution of the additives is iajected iato the air or gas flow to generate a mist or foam. No additives are used ia dry air or gas drilling operations. Gas-based fluids are not recirculated and materials are added continuously. As the fluid exits the well, air or water vapor escapes to the atmosphere, gas and oil are burned, and water and formation soflds are collected into a pit for later disposal. Stable foams must be destabili2ed to separate the air from the Hquid phase for disposal. 

The positive displacement motor of the Moineau-type design can be operated with unstable foam (or mist) as the drilling fluid. Some liquid must be placed in the air or gas flow to lubricate the elastomer stator as the metal rotor rotates against the elastomer. Positive displacement motors have been operated quite... 

A drilling fluid comprising air, water, and a foaming agent (surfactant). These substances travel into a well as a mist, then change into a foam before returning up the annulus. See also Air Drilling Fluid, Stable Foam, Stiff Foam. 

Figure 4. Flow regimes corresponding to the use of air, mist, foam, or liquid as a drilling fluid. (From Lorenz [22]. Copyright 1980 Gulf Publishing Co., Houston, TX, USA.)...

Features Provides superior foam stability for stable foam drilling can be added batch-wise to the mist tank or metered into the mist fluid with a chemical pump Properties Cl. It. amber liq. dens. 8.62-8.82 vise. 6.5 cps flash pt. 131 F pH 11-12 100% act. 

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