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API RP 13B-1 6th Edition

Recommended Practice for Field Testing Water-Based Drilling Fluids
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API Recommended Practice (RP) 13B-1 is a widely used and authoritative standard in the petroleum and natural gas industries. It specifies the standard procedures for the field testing of water-based drilling fluids (WBFs). 

The vast majority of field tests conducted by drilling-fluid companies are standardized according to API RP 13B-1 and its counterpart for oil-based fluids, API RP 13B-2. It is also identical to the international standard ISO 10414-1:2008. 

Key Uses and Scope

API RP 13B-1 is the definitive guide for drilling fluid specialists, engineers, and laboratory technicians to monitor and assess the performance of drilling fluids at a rig site. Equipment manufacturers produce testing apparatus specifically designed to comply with this standard. 

The recommended practice provides standard procedures for determining various characteristics of water-based drilling fluids, including: 

  • Drilling fluid density (mud weight)
  • Viscosity and gel strength
  • Filtration properties
  • Water, oil, and solids contents
  • Sand content
  • pH, alkalinity, and chloride content 

The standard is a fundamental reference for ensuring that drilling fluids meet operational requirements for safe and efficient drilling operations. 

SDO API: American Petroleum Institute
Document Number 13B-1
Publication Date Jan. 1, 2026
Language en - English
Page Count
Revision Level
Supercedes
Committee
Publish Date Document Id Type View
Jan. 1, 2026 API RP 13B-1 6th Edition Revision
Not Available Revision