SY/T 6125-2024 Technologyproceduresforgas welltestinggas producing andperformance monitoring English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 6125-2024
Replaces SY/T 6125-2013
Technology procedures for gas well testing gas producing and performance monitoring
气井试气、采气及动态监测工艺规程
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Well Testing
5 Production
6 Performance Monitoring
7 Health, Safety and Environmental Control
Procedure Specification for Well Testing, Gas Production, and Performance Monitoring of Gas Wells
1 Scope
This document specifies the main technical contents and requirements for well testing, production, and performance monitoring of gas wells.
This document applies to well testing, production, and performance monitoring of onshore conventional gas, shale gas, and tight gas wells.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 22513 Petroleum and natural gas drilling and production equipment — Wellhead and christmas tree equipment
GB 39800.2 Specification for the配备 of personal protective equipment — Part 2: Petroleum, chemical, natural gas
NB/T 14002.6 Shale gas — Reservoir stimulation — Part 6: Operation requirements of cluster perforation in horizontal wells
SY/T 0043 Specification for color of pipelines and equipment in oil and gas engineering
SY/T 0599 Technical specification of metallic materials for resistance to sulfide stress cracking and stress corrosion cracking for natural gas surface facilities
SY/T 5154 Sampling methods for reservoir fluid
SY/T 5225 Safety technology code for fire and explosion prevention in drilling, development and storage of petroleum & natural gas
SY/T 5325 Technical specification for conventional perforating operation
SY/T 5440 Technical specification for well testing of natural gas wells
SY/T 5587.3 Code for conventional workover operation — Part 3: Well killing, displacing and flowing induction
SY/T 5587.5 Code for conventional workover operation — Part 5: Preparation of wellbore for downhole operation
SY/T 5587.10 Code for conventional workover operation — Part 10: Hydraulic sand jet perforating
SY/T 5719-2017 Safety specification for natural gas liquids
SY/T 5727-2020 Safety code for downhole operation
SY/T 6096 Specification for compilation of well history in natural gas fields
SY/T 6137 Safety specification for natural gas gathering and processing in hydrogen sulfide environment
SY/T 6176 Technical specification for data acquisition of gas reservoir development wells
SY/T 6276 Petroleum and natural gas industries — Health, safety and environment management systems
SY/T 6277-2017 Specification for personal protection in hydrogen sulfide environment
SY/T 6293 Specification for exploration well testing
SY/T 6580 Commonly used quantities and units in petroleum and natural gas exploration and development
SY/T 6581 Technical specification for testing of high pressure oil and gas wells
SY/T 6610 Safety specification for downhole operation location in hydrogen sulfide environment
TSG 21-2016 Supervision regulation on safety technology for stationary pressure vessels
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
condensate gas well
A gas well whose produced natural gas contains pentane and heavier components greater than 50 g/m³ but less than 200 g/m³.
3.2
gas well of high pressure
A gas well with formation pressure not lower than 70 MPa.
3.3
gas well of high temperature
A gas well with formation temperature higher than 150°C.
3.4
sour gas well
A collective term for gas wells containing acidic media such as hydrogen sulfide or carbon dioxide.
3.5
high production gas well
A gas well with absolute open flow potential not less than 100×10⁴ m³/d.
3.6
high hydrogen sulfide content
Hydrogen sulfide content in the formation gas medium not less than 30 g/m³.
3.7
well barrier
A system designed to prevent unintended leakage of formation fluids to the wellbore, other formations, or the external environment.
4 Well Testing
4.1 Well Testing Preparation
4.1.1 Well Integrity Evaluation
4.1.1.1 Well integrity evaluation shall be conducted before well testing for high-temperature, high-pressure, and high-hydrogen-sulfide gas wells.
4.1.1.2 Well integrity evaluation includes the evaluation of barrier components such as the formation, wellbore, and wellhead, as well as annulus pressure analysis.
4.1.1.3 Before well testing, a gas well shall be equipped with at least one independent well barrier. Before well testing for sour gas wells, at least two independent and effective well barriers shall be equipped.
4.1.1.4 For wells failing well integrity evaluation, a risk assessment shall be conducted, and measures to mitigate the risks shall be formulated.
4.1.2 Site
4.1.2.1 The wellsite size shall meet the well testing design requirements. The wellsite shall be leveled, with the center 10 cm ~ 30 cm lower than the surrounding area. Drainage ditches shall be unobstructed, ensuring clean water and wastewater diversion.
4.1.2.2 There shall be liquid storage tanks with a total capacity not less than twice the wellbore volume.
4.1.2.3 The distance from the field office to the wellhead and liquid storage tanks shall be not less than 30 m.
4.1.3 Water and Electricity
4.1.3.1 The total capacity of water tanks shall be not less than 1.5 times the wellbore volume.
4.1.3.2 The distance from the generator room and electrical switches to the wellhead and the flare line outlet shall be greater than 30 m. There shall be no exposed wires or electric leakage. Lightning protection devices shall be installed for the generator room and automatic control equipment at the wellsite.
4.1.3.3 The use of electricity at the wellsite shall comply with the provisions of 3.19 in SY/T 5727-2020.
4.1.4 Workover Fluids
4.1.4.1 Workover fluids of qualified quality and sufficient quantity shall be prepared according to the requirements of the well testing design.
4.1.4.2 The total capacity of containers for kill fluid shall be not less than 1.5 times the wellbore volume.
4.1.4.3 For high-pressure and high-hydrogen-sulfide gas wells, emergency kill fluid shall be additionally reserved, with an effective volume not less than 1.5 times the wellbore volume and a density equal to the density of the kill fluid for the test zone; or weighting materials and treatment agents sufficient to prepare an equal volume of kill fluid with the same density shall be reserved.
4.1.5 Operation Equipment
Well testing operation equipment shall be selected according to the well testing design requirements. The installation and inspection of operation equipment shall comply with the provisions of SY/T 5587.5.
4.1.6 Test Flow System
4.1.6.1 The test flow system consists of a Christmas tree, insulation device (heat exchanger or steam generator), choke manifold, separator, data acquisition head, and burner. A suitable test flow system shall be selected based on the pressure rating, production rate, and fluid properties of the gas well.
4.1.6.2 The material and pressure rating of the test flow system shall meet the test requirements. The selection of the test flow system shall comply with the provisions of SY/T 0599 and SY/T 6581.
