Drilling fluid foam properties

While drilling low-pressure reservoirs with nonconventional methods, it is conunon to use low-density dispersed systems, such as foam, to achieve underbalanced conditions. To choose an adequate foam formulation, not only the reservoir characteristics but also the foam properties need to be taken into account. Parameters such as stability of foam and interactions between rock-fluid and drilling fluid-formation fluid are among the properties to evaluate while designing the drilling fluid [13]. 

Uses Wetting and foaming agent for sat. brines incl. CaClj, HCI, NaCI, high-temp, acidizing drilling fluid additive removes oil-based muds prior to cementing or stimulation stable to 400 F stable to acids Properties Water-wh. liq. 50% act. 

Foam Control. Whereas some siUcones are known to be foam promoters, Dow Corning FS-1265 Fluid is a Hquid fluorosiUcone with effective antifoam properties. Petroleum industry appHcation of fluids and dispersions in gas—oil separators on offshore drilling platforms has been successful. Their use peaked in the early 1980s, coinciding with constrained cmde oil capacity and production. Diesel fuels are an excellent solvent for dimethyl silicones and render them ineffective as an antifoam. A new antifoam which does not require the use of added siUca is formulated from a fluorosiUcone copolymer. It has shown promise to antifoam (8) diesel fuel (see Defoamers). 

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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