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Originally Posted by bengoan

I need the API RP 131 (American Petroleum Institute, 2001.Recommended Practice for Field Testing water-based Drilling Fluids. API Recommended Practice 131/ISO 10416)
Please give me a download link.
Thanks in advance.

Here you are

RP 13I/ISO 10416:2008
Recommended Practice for Laboratory Testing of Drilling Fluids
Petroleum and natural gas industries—Drilling fluids—Laboratory testing
8th Edition | March 2009 | Product Number: GX13I8 | Price: $180.00