ISO/TS 26762:2025
(Main)Design and operation of allocation systems used in gas productions facilities
Design and operation of allocation systems used in gas productions facilities
This document specifies how to design and operate allocation systems for gas production facilities. It describes the most common types, principles and methods used for the allocation of gas and associated liquids. The objective is to provide an approach to current best practice in the oil and gas industry. It applies to gas and liquid allocations to be performed in production, processing, transportation, storage and terminal installations dealing with natural gas and associated liquids as well as end products like sales gas, liquefied petroleum gas (LPG), liquefied natural gas (LNG), condensate and to some extend non-hydrocarbon gases like CO2, H2. This document provides the minimum information needed to develop and implement allocation procedures and systems both for internal purposes (well allocation) and fiscal or commercial applications with different owners and stakeholders. This document can be used to develop gas and liquid processing and transportation agreements and regulatory documents as well as to conduct audit of measurement and allocation systems. It also introduces the areas of competence needed and the terminology used in the industry.
Conception et opération des systèmes d'allocation dans les installations de production de gaz
General Information
Relations
Standards Content (Sample)
Technical
Specification
ISO/TS 26762
First edition
Design and operation of allocation
2025-04
systems used in gas productions
facilities
Conception et opération des systèmes d'allocation dans les
installations de production de gaz
Reference number
© ISO 2025
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ii
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Fluids .2
3.2 Definitions for allocation systems .4
3.3 Streams .6
4 Allocation fundamentals . 7
4.1 Allocation definition and objective .7
4.2 Allocation and metering .7
4.3 Gas productions facilities .7
4.4 Allocation applications and cases .8
4.5 Allocation types and classification .8
4.5.1 General .8
4.5.2 Technical allocation .8
4.5.3 Contractual and fiscal allocation .9
4.6 Allocation in the value realization chain.9
4.7 Allocation boundaries and steps .11
4.8 Physical streams . 12
4.8.1 General . 12
4.8.2 Products . 12
4.8.3 Input streams . 13
4.8.4 Fluid characteristics . 13
4.8.5 Gas and liquid compositions . 13
4.9 Allocation process . 13
4.10 Gas allocation cases summary .14
4.11 Allocation methodology .14
4.12 Balance and reconciliation . . 15
4.12.1 Balance . 15
4.12.2 Reconciliation .17
4.13 Units .17
4.14 Upstream allocation example .17
4.15 Contractual gas allocation.18
4.15.1 General .18
4.15.2 Gas-allocation issues . .19
4.15.3 Measurement .19
4.15.4 Terminal products . 20
4.15.5 Pipeline capacity . 20
4.15.6 System response time . 20
4.15.7 Agreements . 20
4.15.8 Regulatory . . .21
4.15.9 Commercial issues .21
4.15.10 Time period .21
4.15.11 Forecasting .21
4.15.12 Pipeline stock . 22
4.15.13 Existing systems . 22
4.15.14 Data timing . 22
4.15.15 Data flow and reporting. 22
4.15.16 Auditing . 22
4.15.17 Fallback . 22
4.15.18 Summary . 22
5 Fluid property and parameters for allocation .23
iii
5.1 Fluid types . 23
5.2 Gas and liquid properties .24
5.2.1 General .24
5.2.2 Stabilized fluids .24
5.2.3 Equilibrium gas (separated gas at dew point) .24
5.2.4 Equilibrium liquid (separated liquid at bubble point) .24
5.2.5 Flash calculations for non-stabilized and wet gas flows .24
5.3 Fluid information for allocation . 25
5.3.1 Fluid compositions . 25
5.3.2 Fluid properties . . . 25
5.3.3 Allocation process factors for gas allocation . 26
5.3.4 Blending effect . 29
5.4 Use of phase behaviour/process simulation models . 29
5.4.1 Introduction . 29
5.4.2 Applications . 30
5.4.3 Process simulation model types .
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