API RP 13D-2009 Draft. Rheology and hydraulics of oil-well drilling fluids

American Petroleum Institute (API). Date: 2009-10-05. 84p. This API document is a Draft Standard. The objective of this Recommended Practice (RP) is to provide a basic understanding of and guidance about drilling fluid rheology and hydraulics, and their application to drilling operations. The purpose for updating the existing Recommended Practice, last published in May 2003, is to make the work more applicable to the complex wells that are now commonly drilled. These include: High-Temperature/High-Pressure (HTHP), Extended-Reach Drilling (ERD), and High-Angle Wells (HAW).