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A mill with a gradual concave or convex taper designed to enlarge the wellbore.
A spear-like fishing device with threads to engage ID threaded fish.
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The near solid or highly viscous residuals at the bottom of an oil storage tank, generally composed of a large amount of paraffins, silt, heavy ends, etc.
In the context of drilling, tangible costs are items of well construction that have salvage value, ordinarily capitalized on taxes.
In the context of tubing, tangential stress are stresses around the body of the tubing (Hoop Stresses).