GB 46995-2025 Safety protection specification for natural gas well containing hydrogen sulfide English, Anglais, Englisch, Inglés, えいご
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ICS
CCS H
National Standard of the People's Republic of China
GB 46995-2025
Safety protection specification for natural gas well containing hydrogen sulfide
含硫化氢天然气井安全防护规范
Issue date: 2025-12-02 Implementation date: 2027-01-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
4.1 Safety Management
4.2 Personnel Training
5 Public Hazard Level Classification and Safety Protection Distance
5.1 Public Hazard Level Classification
5.2 Onshore Public Safety Protection Distance
6 Safety Protection for Onshore Production Operations
6.1 General Requirements
6.2 Drilling Engineering
6.3 Logging Engineering
6.4 Downhole Operations
6.5 Gas Production Engineering
6.6 Decommissioning
7 Safety Protection for Offshore Production Operations
7.1 General Requirements
7.2 Drilling Engineering
7.3 Logging Engineering
7.4 Downhole Operations
7.5 Gas Production Engineering
7.6 Decommissioning
8 Emergency Management
8.1 General Requirements
8.2 Emergency Drills
8.3 Emergency Evacuation
8.4 On-site Rescue
8.5 Onshore Wellhead Ignition Handling
9 Verification Methods
Bibliography
Safety Protection Code for Natural Gas Wells Containing Hydrogen Sulfide
1 Scope
This document specifies general safety protection requirements for natural gas wells containing hydrogen sulfide, public hazard level classification and safety protection distances, safety protection and emergency management requirements for onshore and offshore production operations, and describes the corresponding verification methods.
This document applies to the safety protection of natural gas wells containing hydrogen sulfide.
2 Normative References
The following documents contain provisions that, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition corresponding to that date applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 29639 Guidelines for the Preparation of Production Safety Accident Emergency Response Plans for Production and Business Entities
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
natural gas well containing hydrogen sulfide
A natural gas well with a hydrogen sulfide content in the formation gas medium greater than or equal to 75 mg/m³ (50 ppm); or where the total pressure of the natural gas is greater than or equal to 0.4 MPa, and the hydrogen sulfide partial pressure is greater than or equal to 0.003 MPa.
.2
natural gas well containing high hydrogen sulfide
A natural gas well with a hydrogen sulfide content in the formation gas medium greater than or equal to 1,500 mg/m³ (1,000 ppm).
3.3
release rate of hydrogen sulfide
The amount of hydrogen sulfide released into the atmosphere per unit time from a natural gas well containing hydrogen sulfide under accident conditions.
Note: Under standard conditions (temperature 0°C, pressure 1 standard atmosphere), the unit is m³/s.
3.4
hydrogen sulfide environment
An area containing or potentially containing hydrogen sulfide.
Note 1: The maximum concentration of hydrogen sulfide gas that will not cause harm to human health without any personal protective measures is 15 mg/m³ (10 ppm).
Note 2: The maximum acceptable concentration of hydrogen sulfide gas for 8 hours without any personal protective measures is 30 mg/m³ (20 ppm).
Note 3: The minimum concentration of hydrogen sulfide gas that can cause irreversible or delayed health effects without any personal protective measures is 150 mg/m³ (100 ppm).
[SOURCE: GB 42294—2022, 3.1, modified]
4 General Requirements
4.1 Safety Management
4.1.1 A safety management system shall be established and implemented, and a hydrogen sulfide protection management system shall be developed, including but not limited to:
a)Employee training and education;
b) Management of personal protective equipment;
c) Management of hydrogen sulfide concentration monitoring;
d) Emergency management for hydrogen sulfide poisoning.
4.1.2 On-site hydrogen sulfide environment archives shall be established, including but not limited to:
a) Personnel certification and education registration files;
b) Personal protective equipment files;
c) Personal protective equipment inspection records;
d) Hydrogen sulfide concentration monitoring records;
e) Hydrogen sulfide poisoning emergency drill records.
4.2 Personnel Training
4.2.1 Personnel engaged in operations within hydrogen sulfide environments shall receive hydrogen sulfide protection training as required in 4.2.2 before starting work. They may commence work only after obtaining a training qualification certificate and shall undergo periodic refresher training.
4.2.2 Hydrogen sulfide protection training shall include, but not be limited to, the following:
a)Basic knowledge, including the physical and chemical properties, toxicity, health hazards, poisoning manifestations of hydrogen sulfide, and the conditions and preventive measures for iron sulfide auto-ignition;
b) Standards and regulations related to hydrogen sulfide protection;
c) Work requirements, including prevention of hydrogen sulfide during operations, equipment configuration, and routine inspections;
d) Requirements for the use and maintenance of safety facilities, including fixed hydrogen sulfide detection and alarm systems, ignition (vent) devices, breathing air compressors, wind indicators, ventilation and exhaust devices, alarm devices, escape facilities, and safety warnings;
e) Requirements for the use and maintenance of personal protective equipment, including portable hydrogen sulfide detectors, eyewash stations, and positive-pressure air respirators;
f) On-site emergency response, including types of emergency events, main contents of emergency plans (emergency organization structure and responsibilities, emergency response and support, etc.), and on-site emergency response procedures;
g) On-site emergency rescue, including first aid methods for poisoning victims and cardiopulmonary resuscitation (CPR);
h) Case studies, including typical domestic and international case studies of hydrogen sulfide leakage and poisoning accidents.
4.2.3 Non-operating personnel entering station sites and well sites shall be informed of safety risks. They shall be informed of potential hydrogen sulfide hazards, demonstrated the correct use of personal protective equipment and emergency facilities, informed of emergency escape routes, and required to sign a safety commitment form. The number of non-operating personnel simultaneously entering the operation area of an onshore well site shall be controlled, with a maximum of 3 persons.
