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Exercise 5. Point out true or false
1. Low- or neutral-pH, gypsum-treated fluids were "sulfate-
saturated," and contained high filtrate plumbum.
2. Red-lime, oil-emulsion fluids were popular in the late
1950s, and appeared to give good drill pipe protection.
3. The emulsified water formed a protective "oil-wet" film
on the metal and allowed the drill pipe to be isolated from the fresh
or saltwater environment.
4. Makeup water was treated to minimize these detrimental
bacterial effects.
5. Without the protective coating, high-pH and an inhibitor
based on organic phosphate esters can be used effectively in the
drilling environments to protect the tubulars.
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