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API RP 13I 8th Edition, March 1, 2009
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Recommended Practice for Laboratory Testing of Drilling Fluids
Includes all amendments and changes through Reaffirmation Notice , March 2016
Additional Comments: GX1318 * SAME AS ISO 10416
Page Count:124
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This International Standard provides procedures for the laboratory testing of both drilling fluid materials and drilling fluid physical, chemical and performance properties. It is applicable to both water-based and oil-based drilling fluids, as well as the base or “make-up” fluid.

It is not applicable as a detailed manual on drilling fluid control procedures. Recommendations regarding agitation and testing temperature are presented because the agitation history and temperature have a profound effect on drilling fluid properties.