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Worldwide, 69–77% of baryte is used as a weighting agent for drilling fluids in oil and gas exploration to suppress high formation pressures and prevent blowouts. As a well is drilled, the bit passes through various formations, each with different characteristics. The deeper the hole, the more baryte is needed as a percentage of the total mud mix. An additional benefit of baryte is that it is non-magnetic and thus does not interfere with magnetic measurements taken in the borehole, either during logging-while-drilling or in separate drill hole logging. Baryte used for drilling petroleum wells can be black, blue, brown or gray depending on the ore body. The baryte is finely ground so that at least 97% of the material, by weight, can pass through a 200-mesh (75 μm) screen, and no more than 30%, by weight, can be less than 6 μm diameter. The ground baryte also must be dense enough so that its specific gravity is 4.2 or greater, soft enough to not damage the bearings of a tricone drill bit, chemically inert, and containing no more than 250 milligrams per kilogram of soluble alkaline salts.

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Barite (drilling)

4.2 gr/cm3 (min) Specific gravity
250ppm (max) Soluble alkaline earth metals as calcium
0.1% (max) Water soluble solids
125/125cps (max) Apparent viscosity before/after adding of gypsum
6.5 (min) PH at room temp.& 180°F
3w.t% (max) Residue on ASTM sieve No:200
10±5 w.t% Residue on ASTM sieve No:325
30%w (max) Particles less than 0.6 µm
0.2% (max) Moisture



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