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About This Item


Full Description

This International Standard covers physical properties and test procedures for materials manufactured for use in oil- and gas-well drilling fluids. The materials covered are barite, haematite, bentonite, nontreated bentonite, OCMA-grade bentonite, attapulgite, sepiolite, technical-grade low-viscosity carboxymethylcellulose (CMC LVT), technical-grade high-viscosity carboxymethylcellulose (CMC-HVT), starch, low-viscosity polyanionic cellulose (PAC-LV), high-viscosity polyanionic cellulose (PAC-HV), drilling-grade Xanthan gum, and barite 4,1. This International Standard is intended for the use of manufacturers of named products.

This edition of API Spec 13A is the identical national adoption of ISO 13500, Petroleum and natural gas industries-Drilling Fluids-Specifications and testing, and includes the addition of an API Monogram Annex.

Document History

  1. API Spec 13A (R2015)


    Specification for Drilling Fluid Materials, Eighteenth Edition, Includes Errata 1, 2, & 3

    • Most Recent
  2. API Spec 13A

    Specification for Drilling-Fluid Materials, Seventeenth Edition, Includes Errata (2008)

    • Historical Version
  3. API 13A

    Specification for Drilling-Fluid Materials, Sixteenth Edition and ISO 13500:1998 (Modified) Petroleum and Natural Gas Industries - Drilling Fluid Materials-Specification and Tests

    • Historical Version
  4. API 13A

    Drilling-Fluid Materials

    • Historical Version

Amendments & Errata

  1. API Spec 13A Errata


    Errata 1, 2 & 3 for Specification for Drilling Fluid Materials, Eighteenth Edition