Mist drilling

At this point, begin air or mist drilling. Drill 20 to 100 ft to allow any sloughing hole to be cleaned up. 

Begin drilling. After 5 or 10 ft have been drilled, the hole should dust (although it is sometimes necessary to drill 60 to 90 ft before dust appears at the surface). If the hole does not dust after these steps have been carried out, pump another surfactant slug around. If dusting cannot be achieved, mist drilling may be required to complete the operation. 

Depending on the hole depth, the entire procedure requires 2 to 6 hr. Holes of over 11,000 ft have been successfully unloaded using the aeration method. A well can be dusted, mist-drilled, dried up and returned to dust drilling. To dry a hole properly, it is important that it be kept clean. Drying agents have been tried but without much success. The best drying agent available at the present lime is the formation itself. 

Mist Drilling Fluid Mitchell Foam Quality Monodisperse... 

Foamer. [Harcros] Anionic ether sulfate foamo- for air mist drilling, general detergents, gypsum board prod. 

Uses Foaming agent for air/foam, air/gel-foam, or mist drilling applies. 

Uses Foaming agent used for air and mist drilling in gas and oil fields Features Foams in hard water, fresh water, and saturated brine solutions, and in the presence of oils or high concentrations of polyvalent cations Regulatory Australia AlCS, Canada DSL, Europe EINECS, China lECSC, Philippines PICeS listed... 

Chem. Descrip. blend of quaternary fatty amines and oxyalkylted surfactants in a sol n of methanol, isopropyl alcohol and water Uses Surfactant used in fresh water to remove drilling solids during air-mist drilling operations Use Level 0.2-0.8%... 

Uses Surfactant used in fresh water to remove drilling solids during air-mist drilling operations... 

Uses Foaming agent yielding expanded foam volume with stability for firefighting, cellular concrete, air and mist drilling Properties Yel. cl. liq. 40% act. 

Anedco AF-802 Anedco AF-804 foam builder, air-entrainment agents Rewopol NL 2-28 foam builder, air-mist drilling applies. 

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