GB/T 35065.1-2018Wet natural gas flow measurement—Part 1: General rules (English PDF)
湿天然气流量测量 第1部分：一般原则
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 14, 2018
Implementation date
December 1, 2018
Scope
GB/T 35065.1-2018 is the English-translated version of 湿天然气流量测量 第1部分：一般原则.
GB/T 35065.1-2018 lays down the general rules for measuring the flow of wet natural gas in onshore and offshore oil and gas fields.
It defines terms such as wet natural gas, phase, multiphase flow and gas volume fraction, sets out the purposes of measurement and classifies wet gas flow patterns in horizontal, vertically rising and vertically descending flow.
It describes three measurement approaches: gas phase flow with a correction factor, gas-liquid two-phase flow and gas-water-hydrocarbon three-phase flow. It also gives general principles for design and installation, commissioning, performance testing, operation and maintenance, and uncertainty assessment.
The measurements support gas reservoir management, well production optimisation, hydrate control, production calculation and sales allocation. It was prepared with reference to ISO/TR 12748:2015, was issued on 14 May 2018 and has applied since 1 December 2018.
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Document preview — GB/T 35065.1-2018
National Standard of the People's Republic of China
- ICS
- 75.060
- Classification
- E 24
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Measurement purposes
- 5 Wet natural gas flow classification
- 5.1 Influence of wet natural gas flow pattern on flowmeter
- 5.2 Horizontal flow of wet natural gas flow pattern
- 5.3 Vertically rising flow of wet natural gas flow pattern
- 5.4 Vertically descending wet natural gas flow pattern
- 5.5 Flow Pattern Figure
- 5.6 Flow pattern change
- 6 Measurement method
- 6.1 Method for measuring gas phase flow in combination with correction factor
- 6.2 Method for measuring gas-liquid two-phase flow
- 6.3 Method for measuring gas-water hydrocarbon three-phase flow
- 7 General principles of design and installation
- 8 Debug
- 9 performance test
- 10 Operation and Maintenance
- 11 Uncertainty assessment
Foreword
This section is the first part of the wet gas flow measurement standard.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
Introduction
Wet natural gas flow measurement standards are divided into general principles, standard equipment technical requirements, differential pressure flowmeters, spiral vortex flowmeters, two-phase wet Natural gas flowmeter, multi-phase wet natural gas flowmeter, performance evaluation of measurement system, etc.
Wet natural gas flow measurement for gas reservoir dynamic management, gas well production capacity optimization, hydrate control and flow during wet natural gas transportation operations Dynamic safeguards, production calculations and sales allocations provide basic data for calculations and design and are one of the key measurement methods in the upstream field of natural gas.
This part is formulated with reference to ISO /T R12748.2015 "Measurement of Wet Natural Gas Flow in Natural Gas Production".
Caution - This section does not cover all security issues related to its application. Before using this section, the user is responsible for making the corresponding Safety and protection measures and clarify the scope of their limitations.
1 Scope
This part of GB/T 35065 specifies the classification of wet natural gas flow, the method of flow measurement, and the selection, installation and commissioning of flowmeters. General principles for testing, operation and maintenance, and uncertainty assessment.
This section applies to wet natural gas flow measurements in onshore and offshore oil and gas fields.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 20604 Natural Gas Vocabulary (GB/T 20604-2006, ISO 14532:2001, IDT)
3 Terms and definitions
The following terms and definitions as defined in GB/T 20604 apply to this document.
3.1 Wet natural gas
The natural gas volume dominates the gas-liquid two-phase flow, and its relative humidity reaches a saturated state.
3.2 Phase
Three components of gas, water and hydrocarbon liquids in wet natural gas.
3.3 Multiphase flow
A fluid composed of two or more of a gas phase, an aqueous phase, and a hydrocarbon liquid phase.
3.4 Gas volume fraction; GVF
Under the working conditions, the ratio of gas volume flow to total fluid flow, GVF can be expressed as the ratio or percentage, see equation (1).
In the formula.
GVF---gas volume fraction, dimensionless;
Qg --- gas volume flow in cubic meters (m³);
Ql --- liquid volume flow in cubic meters (m³).
Note: Rewrite the definition of GB/T 20604-2006, 2.5.3.1.1.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
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Related Standards
GB/T 20604-2006 — Natural gas - Vocabulary
GB/T 20604-2025 — Natural gas - Vocabulary
GB/T 35065.2-2023 — Wet natural gas flow measurement - Part 2: Test and evaluation method of flow meter
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