Overview
ISO/TR 26762:2008 (Technical Report) provides best-practice guidance for the allocation of natural gas and condensate in upstream production systems. It covers the hardware, procedures and data-handling methods used to allocate gas and condensate back to individual concessions, reservoirs and wells in a fair, equitable and auditable way. The report is informative (a Technical Report) and is intended to reflect current industry practice for sales and production allocation where commingled flows travel through shared pipelines and treatment facilities.
Key topics and technical requirements
The report addresses the full allocation lifecycle and related technical considerations, including:
- Economic aspects: value of measurement information, cost vs. uncertainty trade-offs, and design of cost-effective allocation systems.
- Allocation terminology and viewpoints: physical, commercial and system definitions required for clear allocation rules.
- Quantity measurement: requirements and options for metering gas and condensate (single-phase and multiphase), test separators, and test lines.
- Quality measurement: sampling, gas-chromatography analysis and uncertainty of compositional data (references include ISO 6974/6975/6976).
- Data processing: calculations at measurement points, balancing/reconciliation, process simulation, line-packing and stock change handling.
- Handling of lift, injection and utility gas: allocation and uncertainty considerations for non-sales gas streams.
- Uncertainty and validation: methods for uncertainty determination, meter and process validation, and software/data validation to ensure auditability.
- Classification and correction: classification of allocation processes, and procedures for mis-measurements, measurement-corrections and estimations.
- Informative annexes: guidance on impurities, fuel/flare adjustments, wet gas, conversions and reporting components.
Normative references cited include ISO 5167, ISO 5168, ISO 6974/6975/6976, ISO 9951 and ISO 10715.
Practical applications and who uses this standard
ISO/TR 26762:2008 is useful for:
- Upstream operators and joint-venture partners that need fair, auditable allocation of sales and production volumes.
- Metering and measurement engineers selecting and validating metering hardware (turbine meters, multiphase meters).
- Allocation engineers and commercial analysts responsible for settlement, revenue distribution and contract compliance.
- Reservoir and production engineers using measurement data for reservoir modelling and optimization.
- Regulators and auditors seeking traceable, industry-recognized allocation procedures.
Typical uses include designing allocation systems for commingled pipelines, setting procedures for sampling/analysis and reconciliation, assessing economic impacts of measurement uncertainty, and documenting validation for commercial settlements.
Related standards
Keywords: ISO/TR 26762:2008, natural gas allocation, upstream gas, condensate allocation, production measurement, metering uncertainty, gas sampling, data reconciliation, allocation system.