Overview
EN ISO 10426-1:2009 (adopted by CEN) is the international specification for cements and materials for well cementing in the petroleum and natural gas industries. The standard defines requirements and recommendations for six classes of well cement - A, B, C, D, G and H - and sets out chemical and physical requirements plus procedures for laboratory physical testing used to verify product performance for well applications.
Key topics and technical requirements
- Well cement classes: Applies to classes A, B, C and D (Portland clinker ground with optional calcium sulfate and processing or set‑modifying additives) and classes G and H (clinker ground with calcium sulfate and limited additives for chromium(VI) reduction).
- Chemical and physical specification: Defines the compositional basis and performance attributes manufacturers must meet (chemical analysis, fineness, packing/marking).
- Sampling and test frequency: Requirements for sampling procedures, timing of tests and equipment to ensure representative laboratory results.
- Physical test methods: Procedures and acceptance criteria for core laboratory measurements frequently used in well cementing qualification, including:
- Fineness tests (cement particle size characteristics)
- Slurry preparation for testing (free fluid, compressive strength, thickening-time)
- Free‑fluid (free‑water) tests
- Compressive strength tests (mortars/cube methods per recognized methods)
- Thickening‑time tests (rheology/consistency over time)
- Calibration and apparatus: Guidance on calibrating thermocouples, temperature control systems and other test apparatus to assure accuracy and reproducibility.
- Marking and packing: Requirements for product identification, packaging and information supplied with cement shipments.
Applications and users
This standard is used to ensure consistency, safety and performance of well cementing materials across exploration, drilling and production operations. Typical users include:
- Drilling and cementing engineers specifying well cement for casing and zonal isolation
- Cement manufacturers and processors producing well cement classes A–D, G and H
- Laboratory and QA/QC testing facilities performing physical qualification tests
- Procurement and regulatory bodies referencing standard specifications for contractual acceptance
- Offshore and onshore operators requiring compliant cements for well integrity
Related standards
- Other parts of ISO 10426 series (Testing and specialized methods: Parts 2–6)
- Normative references cited within the standard such as ASTM C109/C109M, EN 196 series, ISO 3310-1, and ISO 13500
EN ISO 10426-1:2009 is essential for anyone involved in specifying, manufacturing, testing or approving well cement materials where reliable cement slurry performance and well integrity are critical keywords: well cementing, well cements, ISO 10426-1, cement testing, thickening time, compressive strength.
