| http://www.w3.org/ns/prov#value | - wellbore below the ground surface. Natural polymers include polysaccharides, such as guar and derivatives of guar such as hydroxypropyl guar (HPG), carboxymethylhydroxypropyl guar (CMHPG), carboxymethyl guar (CMG), or hydrophobically modified guar.
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