SY 6137-1996 Technical Regulations for Safety Production of Sour Gas WellsSY6137-1996 Standard download and decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY 61371996
Technique rules of safety production for sour nature gas well
1996-04-21 Issued
China National Petroleum Corporation
1996-10-01 Implementation
This standard is compiled on the basis of summarizing the experience of exploitation of hydrogen sulfide natural gas (or sour natural gas) in southwest China. In the past 30 years, the scientific and technical personnel of sour gas fields in southwest China have done a lot of experimental work in the laboratory and on the spot. After years of hard work, they have basically figured out the corrosion law of sour gas fields, solved a series of corrosion problems, and successfully exploited sour gas fields in southwest China. The purpose of this standard is to further standardize the design and safety production of sour gas wells, fully emphasize the harmfulness of hydrogen sulfide, and avoid the damage caused by hydrogen sulfide to the parallel pipe string and parallel port equipment. Pollution to the environment and harm to the personal safety of operators; and provide some safety technical issues to be followed in the design of sour gas wells and gas production. However, this does not mean that all the costs of safe production have been included. This standard is proposed and managed by the Petroleum Industry Safety Professional Standardization Technical Committee. Drafting unit of this standard: Sichuan Petroleum Administration Bureau Survey and Design Institute Main drafters of this standard Wang Yukang Wang Qindang 1 Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China Technical Rules of Safety Production for Sour Nature Gas Well
Technique rules of safety production for sour nature gas well This standard stipulates the basic rules to be followed in the design and production of sour nature gas wells SY 6137-1996
This standard is applicable to sour gas wells containing water and hydrogen sulfide and when the total pressure of natural gas is greater than or equal to 0.448MPa and the partial pressure of hydrogen sulfide in natural gas is greater than or equal to 0.000345MPa. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB15089 Steel pressure vessels
SYJ12-85 Requirements for metal materials for resistance to sulfide stress cracking of natural gas surface facilitiesSYJ59-91 Methods for controlling the hardness of steel equipment welds and preventing sulfide stress crackingSY5279.1-91 Rated working pressure and nominal diameter series of oil parallel port devicesSY 5279.2-9l
Oil wellhead devices, flange types, dimensions and technical requirementsSY5279.3-91 Types, dimensions and technical requirements of sealing gaskets for right oil parallel port devices flanges3 Design criteria
In the process of exploiting sour natural gas, the design should take into account the anti-corrosion measures required by 3.1 to 3.5. 3.1 Selection of gas wellhead equipment
The gas wellhead equipment should adopt anti-sulfur gas wellhead equipment, and the gas wellhead equipment of the model specified in SY5279.1 should be selected according to the gas well pressure:
The technical performance of the gas wellhead equipment assembly should meet the requirements of SY5279.1, SY5279.2, and SY5279.3, and should be provided by the manufacturer that has been inspected by the National Oil and Gas Wellhead Equipment Quality Supervision and Inspection Center and obtained a production license: 3.2 Selection of valves
3.2.1 Well site valves
The well site valves should adopt flat valves.
3.2.2 Safety valves
New And consider installing downhole safety valves near the completion of the well, consider installing high and low pressure safety shut-off valves at the head end of the gas gathering pipeline (not in the field), and consider installing check valves at the end of the gas gathering pipeline (in the gas gathering station). 3.3 Selection of pressure vessel materials
The selection of pressure vessel materials should be in accordance with 4.1.1, 4.1.2 of SYJ12-85 and GB1503.4 Selection of gas gathering pipeline materials
Gas gathering pipes that are directly in contact with hydrogen sulfide gas should be in accordance with 4.2.1 and 4.2.2 of SYJ12-85. China National Petroleum Corporation approved on April 21, 1996 and implemented on October 1, 1996
3.5 Selection of metal materials for instruments and other partsSY 6137-1996
The metal materials of all instruments and other parts in contact with hydrogen sulfide media should be selected according to the requirements of the relevant chapters of SYJ12. 4 Installation criteria
The welding of gas gathering pipelines and pipe fittings should comply with Chapter 3 of SYJ12-85 and SYJ59.4.2 Installation of vent pipelines
Vent pipelines should use sulfur-resistant pipes: they must not be cold-formed or bent at will, and must be fixed according to design requirements. 4.3 Installation of safety valves
After the high and low pressure safety shut-off valves are installed, their working pressures should be set within an appropriate range according to the oil pressure. 4.4 Installation of corrosion inhibitor injection devices
A corrosion inhibitor injection device should be installed at the sulfur-containing gas well site, and the installation location should be convenient for the injection of corrosion inhibitors. 4.5 Replacement of parts
Each part of the gas wellhead assembly When parts are damaged, welding shall not be used for repair: new parts shall be replaced. The materials, grades, mechanical properties and anti-sulfur properties of newly purchased equipment or parts shall be consistent with those of the original equipment or parts, and a quality assurance certificate shall be provided. 5 Technical requirements for production and operation
5.1 Configuration and numbering of valves for gas wellhead device The configuration and numbering of valves for gas wellhead device are shown in Figure 1. Figure 1 Configuration and numbering of valves for gas wellhead device 1—No. 1 main gate valve; 2—No. 1 gate valve on the left wing of the pipe: 3—No. 1 gate valve on the right wing of the casing: 4—No. 2 main gate valve; 5—No. 2 gate valve on the left wing of the casing: 6—No. 2 gate valve on the right wing of the casing: 7—Pressure measuring gate valve; 8—No. 1 gate valve on the left wing of the oil pipe; 9—No. 1 gate valve on the left wing of the oil pipe; 10—Angle throttle valve on the left wing; 11—Breed throttle valve on the right wing 5.2 Operation of gas wellhead device
SY 61371996
Gate valves can only be used for interception, and their gates can only be fully open or fully closed, and cannot be in a half-open position. The valves 1, 2, and 3 in Figure 1 should be fully open under production conditions, and the remaining valves should be opened and closed according to production conditions. During maintenance, water can close the corresponding gate valves 1, 2, and 3.
Gate valves 1, 2, and 3 are maintained every six months. Angle throttle valves can only be used to adjust pressure and flow, and cannot be used for closing and sealing. During production, the flow direction of the medium is perpendicular to the direction of the valve stem.
5.3 Parallel port corrosion inhibitor and injection of wellhead corrosion inhibitor operation requirements The corrosion protection of the inner wall of the oil pipe, casing, and gas wellhead device is mainly achieved by injecting corrosion inhibitors. 5.3.1 Commonly used corrosion inhibitors
Commonly used corrosion inhibitors for gas wells in China are shown in Table 1. CT2-11 corrosion inhibitor is an oil-soluble corrosion inhibitor, and CT2-4' corrosion inhibitor is a water-dispersible corrosion inhibitor. Both are suitable for sulfur-containing oil and gas wells containing water, hydrogen sulfide, and carbon dioxide. Table 1 Commonly used corrosion inhibitors for gas wells
Solubility
5.3.2 Injection of corrosion inhibitors
Brown
Slightly odorous
Soluble in hydrocarbons and alcohols
Brownish red
Slightly amine
Dispersible in water, brine
Corrosion inhibitors should be added to the inner wall of the oil pipe, casing screen, gas wellhead equipment, and gas gathering pipeline of sulfur-containing gas wells. A complete record should be kept for each injection of corrosion inhibitors.
The injection of corrosion inhibitor can be carried out in two ways: continuous injection or intermittent injection. When injecting corrosion inhibitor into the well for the first time through the casing annular space, pre-film treatment should be carried out to form a protective film on the protected metal surface of the oil pipe, casing, gas wellhead gasket and gas gathering pipeline. The injection amount should be strictly in accordance with the requirements. 5.4 Internal and external corrosion protection of gas wellhead devices, ground pipelines and equipment 5.4.1 External corrosion protection
Gas wellhead devices, ground pipelines and equipment should be painted regularly for corrosion protection, and each valve (including high and low pressure cut-off valves at the well site) should be regularly filled with butter and sealing grease 5.4.2 Internal corrosion protection
In addition to the above-mentioned corrosion protection, the inner wall of the gas gathering pipeline and brine pipeline can be protected by AC-I anti-sulfur coating. Hydrogen sulfide monitoring and personal safety protection
In the process of hydrogen sulfide gas test production, release, testing and production operation, the emission and leakage of hydrogen sulfide should be monitored and taken. CT2-1, CT2-4 are the product names provided by the Natural Gas Research Institute of Sichuan Petroleum Administration. This information is given to provide convenience to the users of this standard, not the approval of this product by the standard authority. 2AC-1 is the product name provided by the Survey and Design Institute of Sichuan Famous Oil Administration. This information is given to provide convenience to the users of this standard, not the approval of this product by the standard authority. 3
Personal safety protection measures for operators. 6.1 Personnel trainingwww.bzxz.net
SY 61371996
Operators should receive personal safety protection training. Only after passing the assessment can they take up their posts. Refresher training is conducted once a year. The training content should include:
a) Characteristics and hazards of hydrogen sulfide;
b) Performance and use of hydrogen sulfide monitors;
performance and use of personal safety protection equipment;
d) First aid knowledge and skills for poisoned personnel;
e) Safety measures in hydrogen sulfide working areas (such as understanding the importance of upwind direction, safe evacuation routes, etc.);! Relevant exercise requirements.
6.2 Hydrogen sulfide monitoring
When operators enter and operate areas where hydrogen sulfide leakage may occur, they should use hydrogen sulfide monitors to monitor the concentration of hydrogen sulfide. The alarm point of the hydrogen sulfide monitor should be set at 10mg/m and the alarm should enter the emergency protection state. 6.3 Personal safety protection
Sufficient personal safety protection equipment should be equipped. Operators should wear personal safety protection equipment when entering areas with known or unknown hydrogen sulfide concentrations (positive pressure air respirators must be worn in high sulfur environments). 6.4 Principles for handling poisoning
After a person is poisoned, they should immediately leave the scene and evacuate to the upwind direction with fresh air, and give oxygen immediately. For those with respiratory or cardiac arrest, first aid should be immediately carried out on the spot (including artificial respiration and cardiac compression): and call the police for medical treatment,
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