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The fluid filtration and rheological properties of low solid content (LSC) bentonite fluids containing iron-oxide (Fe 2 O 3) nanoparticle (NP) additives and two different NP intercalated clay hybrids, iron-oxide clay hybrid (ICH) and aluminosilicate clay hybrid (ASCH), under both low-temperature lowpressure (LTLP: 25 • C, 6.9 bar) and high-temperature high-pressure (HTHP: 200 • C, 70 bar) conditions are investigated. The viscosity of each fluid was measured under LTLP and HTHP conditions using a pressurized and heated rotational viscometer. The LTLP and HTHP fluid filtrate volumes were measured in accordance to American Petroleum Institute standards. The addition of ICH and ASCH into bentonite solutions reduced both LTLP