Overview
ISO 13503-8:2025 - Oil and gas industries including lower carbon energy - Completion fluids and materials - Part 8: Measurement of properties of coated proppants used in hydraulic fracturing - defines standardized test procedures for evaluating coated proppants used in hydraulic fracturing. The standard provides a consistent methodology for sampling, handling and laboratory tests that characterize the physical performance of both precured and curable coated proppants. It is intended to be used alongside ISO 13503-2 (sieve analysis, particle metrics, density, crush-resistance) and ISO 13503-5 (proppant conductivity).
Key technical topics and requirements
- Scope and purpose: Procedures to evaluate physical properties of coated proppants to enable comparison and selection for fracturing applications.
- Sampling procedures: Guidance on obtaining representative samples from bulk or bagged shipments; addresses particle segregation and continuous sampling. Includes practical details such as:
- Use of a box sampling device with a 13 mm slot (slot length must exceed stream thickness).
- Sampling approaches for bags up to 50 kg and totes/bulk bags up to 2 000 kg.
- Consideration of large shipment variability (e.g., 23 000 kg truck loads, 90 000 kg railcar loads).
- Sample handling and storage: Sample reduction, splitting, record retention and storage requirements to preserve representativeness.
- Performance tests on precured coated proppants:
- Dispersion rate (purpose, equipment, procedures)
- Wear loss (device, measurement and formula - Annex B)
- Performance tests on curable coated proppants:
- Thermal tensile strength
- Curable melting point
- Compressive strength
- Informative annexes: Sieve calibration (Annex A), wear device/formula (Annex B), and core preparation unit/methods (Annexes C and D).
Practical applications and who uses this standard
ISO 13503-8:2025 is used by:
- Proppant manufacturers for product development, QC and certification of coated proppants.
- Completion engineers and operators to select proppant systems that meet field performance requirements.
- Analytical and testing laboratories to perform reproducible, comparable tests for procurement and acceptance.
- Suppliers and purchasers for contractual testing, acceptance criteria and dispute resolution.
- R&D teams evaluating new resin coatings or curable systems for low-carbon or enhanced-performance completions.
Benefits include improved quality control, consistent lab-to-field comparisons, and reduced variability in acceptance testing.
Related standards
- ISO 13503-2 - Proppant particle characterization (sieve analysis, mean diameter, density, crush-resistance)
- ISO 13503-5 - Proppant conductivity testing
Keywords: ISO 13503-8:2025, coated proppants, hydraulic fracturing, proppant testing, sampling procedures, dispersion rate, wear loss, thermal tensile strength, compressive strength, completion fluids.
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