ISO 10426-6-2008 PDF

Full title and description

ISO 10426-6:2008 — Petroleum and natural gas industries — Cements and materials for well cementing — Part 6: Methods for determining the static gel strength of cement formulations. This part specifies requirements and provides test methods for determining the static gel strength (SGS) of cement slurries and related materials under simulated well conditions, used to characterise gel development important for well design and remedial operations.

Abstract

ISO 10426-6:2008 defines laboratory procedures, apparatus and reporting requirements to measure the static gel strength of well cement formulations. The test methods are intended to reproduce relevant well conditions to inform formulation selection and cementing operations where gel strength development affects fluid migration, squeeze and zonal isolation performance.

General information

• Status: Published; confirmed as current following ISO systematic review.
• Publication date: 2008 (published July 2008 / 23 June 2008 in some listings).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.020 (Extraction and processing of petroleum and natural gas); 91.100.10 (Cement).
• Edition / version: Edition 1 (2008).
• Number of pages: 9 (ISO published listing; some national/adopted versions list differing page counts).

Scope

This part of ISO 10426 specifies test methods to determine static gel strength (SGS) of cement slurries and related materials under simulated well conditions. It covers apparatus, sample preparation, test procedure, measurement interpretation and reporting so that SGS results can be used in cement formulation selection and well-cementing design. The methods are intended for laboratory evaluation rather than in-situ field measurement.

Key topics and requirements

• Definition and significance of static gel strength (SGS) for cement slurries.
• Specified apparatus and cell configurations for reproducing downhole static conditions.
• Sample preparation, conditioning (temperature/pressure) and gel-formation timelines.
• Measurement procedures to determine SGS, criteria for gel development thresholds and data recording.
• Reporting requirements: test conditions, formulation details, SGS vs time data and interpretation guidance.
• Guidance on use of SGS results for cementing decisions such as preventing fluid migration, squeeze operations and shallow-water flow mitigation.

Typical use and users

Primary users are petroleum engineering and cementing specialists, laboratory technicians, cement and additive manufacturers, research organisations and regulatory bodies involved in well construction and remediation. Typical uses include laboratory screening of cement formulations, design validation for zonal isolation, and qualification of additives affecting early gel strength.

Related standards

ISO 10426-6 is one part of the ISO 10426 series covering cements and materials for well cementing (parts 1–5 address specifications and other test methods). This part is aligned with related industry documents such as API RP 10B-6 (API recommended practice on determining static gel strength) and is commonly available in adopting standards/EN translations (e.g., BS EN/ DIN EN versions).

Keywords

static gel strength; SGS; well cementing; cement slurry testing; cement formulations; test method; ISO 10426; API RP 10B-6; cement additives; zonal isolation.

FAQ

Q: What is this standard?

A: ISO 10426-6:2008 is an international standard that specifies laboratory methods for measuring the static gel strength of well cement slurries and related materials to support cementing design and evaluation.

Q: What does it cover?

A: It covers apparatus, sample preparation, controlled conditioning (temperature and pressure), measurement procedures for SGS, and reporting requirements so SGS data can be used in formulation selection and cementing operations planning.

Q: Who typically uses it?

A: Cementing engineers, laboratory technicians, additive and cement manufacturers, consultants and regulators in the petroleum and natural gas industries use this standard for laboratory evaluation and quality control.

Q: Is it current or superseded?

A: The 2008 edition (Edition 1) remains published and was confirmed by ISO in its periodic review process (confirmed in 2023), so it is currently considered up to date unless a newer edition is issued. Users should check national adoption notices for any regional updates or amendments.

Q: Is it part of a series?

A: Yes — ISO 10426 is a multipart series addressing cements and materials for well cementing; Part 6 addresses static gel strength specifically and complements other parts that define specifications and additional test methods.

Q: What are the key keywords?

A: Static gel strength (SGS), cement slurry, well cementing, test method, cement formulation, API RP 10B-6, ISO/TC 67.