| http://www.w3.org/ns/prov#value | - thylene phosphonic acids or alkali metal salts thereof to a typical polymer non-dispersed mud, the latter generally containing a clay such as bentonite, polyacrylates and a dual-action polymer or the equivalent, results in a system that is highly resistant to the ordinary harmful effects of calcium and salt contamination, and reduces viscosity buildup due to drilled solids.
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