Some standard content:
Standard of the People's Republic of China for the petroleum and natural gas industry Design Specification of Natural Gas DehydrationSY/T0076—93Editor: Survey and Design Institute of Dagang Petroleum Administration BureauApproved by: China National Petroleum CorporationImplementation date: 1994.3.1Petroleum Industry Press1993 BeijingGeneral provisionsDehydration methods and depthEnergy utilization and processing capacityWater content in natural gasCorrosion and its controlGlycol absorption dehydrationProcess method·Selection of plug numberAdsorption dehydrationProcess methodSelection of process parametersCryogenic dehydrationApplication of water content inhibitorsAir cooling dehydration Water··
Refrigerant refrigeration dehydration
Expansion dehydration
7 Materials
8 Safety and release,
Related charts and graphs on water content in natural gas
Appendix A
Appendix B
Separator process calculation
(5)
(7)
Appendix C Glycol dehydration process calculation
Appendix D Adsorption dehydration process calculation
Additional notes
China National Petroleum Corporation document
(93) CNPC Technology No. 598
Notice on the approval and release of 27 petroleum and natural gas industry standards including "Regulations for the Preparation of Petroleum Surface Engineering Design Documents"
Each has a delivery order, related to the petroleum professional standardization technology quarterly meeting! The draft standards for 27 items, including the "Regulations for the Preparation of Petroleum Surface Engineering Design Documents", have been reviewed and approved and are now approved as petroleum and natural gas industry standards. The names of the customer standards are as follows:
1SY0009-93 Code for Preparation of Design Documents for Petroleum Surface Engineering (Replaces SYJ 9-83)
SY 0055-93
0072-93
0073-93
SY 0074-93
Measurement specification for long-distance oil and gas pipelines
Replaces SYJ55-83)
Test method for high-temperature cathodic disbonding of pipeline anti-corrosion layerStandard test method for materials of pipeline anti-corrosion layer patchStandard test method for insulation and sealing of pipeline anti-corrosion layer patchSY/T 0076-93
SY/T 0077-93
SY/T 052393
SY 402493
Design specification for natural gas dehydration
Design specification for natural gas condensate recovery
Oilfield water treatment filter
General rules for quality inspection and evaluation of petroleum construction projects (replaces SYJn 4024-88)
General rules for quality inspection and evaluation of petroleum construction projects (replaces SYJn 4024-88)
General rules for quality inspection and evaluation of petroleum construction projects (replaces SYJn 4025-93
5Y4026--93
SY 4027---93
SV 4028--93
SV 4029--93
(replaces SYJn 4025--88）
Storage tank worker
Standard for quality inspection and assessment of petroleum construction projects
(Replaces SYJn4026--88）
Standard for quality inspection and assessment of petroleum construction projects
Quality process pipeline installation project
(Replaces SYJn 4027--88)
Standard for quality inspection and assessment of petroleum construction projects
(Replaces SYJn 4028---88)
Station steel
Equipment installation
Standard for quality inspection and assessment of petroleum construction projects
(Replaces SYJn4029--88）
SY 4030.1--93
SY 4030.2--93
sr 4031--93
Sy 4033--93
SY 4034--93
SY 4035--93
Standard for quality inspection and assessment of oil construction projects (overhead power line projects)
(Replace SYJn 403088)
Standard for quality inspection and assessment of oil construction projects (electrical enclosure installation projects)
(Replace SY In 4030--88bZxz.net
Standard for quality inspection and assessment of oil construction projects Automation instrument installation projects
(Replace SYJn 4031--88)
Petroleum construction project quality inspection and assessment standard road engineering
(replace SYJn4033--88)
Petroleum construction project quality inspection and assessment standard (replace SYJn4034-88)
Petroleum construction project quality inspection and assessment standard air, water supply and drainage installation engineering
bridge engineering
heating,
SY 4037-93
SY 4038--93
SY 4058-93
(replace SYJn4035-88)
Petroleum construction project quality inspection and assessment standard promotion construction engineering
(replace SY4037-89)
Petroleum construction project quality inspection and assessment standard promotion construction engineering
(replace SY SY/T 4038--92)
Petroleum construction project quality inspection and assessment standard Pipeline engineering
(Replaces SY4053-92)
SY/T 4068-93
SY/T 4069-93
Refinery
Gas field construction
Petroleum construction project quality inspection and assessment standard Insulated steel pipe production
Petroleum construction project quality inspection and assessment standard Steel container production
SY4070-93 Construction and acceptance specification for petroleum and natural gas pipeline crossing projectsSY/T4071-93 Pipeline downward welding process specification The above standard was implemented on March 1, 1994. China National Petroleum Corporation
September 9, 1993
1,01 In order to unify the design standards and technical requirements for natural gas dehydration in oil and gas fields, ensure the design quality, and make the engineering design technologically advanced, economically reasonable, safe and applicable, and easy to manage, this specification is specially formulated.
1.0.2 This specification only recommends the selection of several commonly used dehydration methods such as absorption method, adsorption method and cryogenic method and the main design parameters. 1.0.3 This specification is applicable to the design of natural gas dehydration equipment for onshore oil and gas mothers. 1.0.4 In addition to complying with this specification, the design of Tianyi gas dehydration shall also comply with the provisions of the relevant national standards in force.
1.0.5 Reference standards
GB 150
GB 151
Steel pressure vessels
Steel shell and tube heat exchangers
GB 50183
GB 8770
GB 9007
GB 10504
SYJ 12
SY 7515
SY 7514
SYJ 24
SY4039
Code for fire protection of oil and gas engineering construction designDetermination method of dynamic water adsorption of molecular sieves
Coarse-pore spherical silica gel
3A molecular sieve and its test method
Requirements for metal materials for sulfide stress cracking resistance of natural gas surface facilitiesOil and gas separator specifications
Natural gas
Code for environmental protection design of oil and gas fields and long-distance pipeline construction projectsBasic terms for Shidu engineering construction
SY/T 0077
ZB E97003
ZB E97002
Design specification for natural gas condensate recovery
Types and basic data of oil and gas heating furnaces Technical regulations for the design of tubular heating furnaces
Safety regulations for heating furnaces in the oil and gas industry
Safety technical regulations for power vessels (Ministry of Labor 2.0.1 Glycol absorption method
2 Terminology
A method of absorbing water vapor in a gas stream with glycol liquid. 2.0.2 Adsorption method
A method of absorbing water vapor in a gas stream with a solid adsorbent. 2.0.3 Low overflow method
A method of directly cooling natural gas with air cooling, expansion method and refrigerant system to reduce the saturated water content in natural gas as the temperature decreases. 2.0.4 Dehydration depth
The degree of water removal in natural gas expressed by the water dew point. 2.0.5 Stripping gas
Dry natural gas or inert gas is passed through the glycol being regenerated to remove the moisture that cannot be removed by the steaming process alone. This gas is called stripping gas. 2.D.6 Rich glycol
Glycol that has absorbed water.
2.0.7 Lean glycol
Glycol that has been regenerated and concentrated.
Regeneration gas
Gas used to heat the adsorbent to remove moisture. Adsorbent
A material used to absorb water, such as silica gel, alumina or molecular sieve. 2.0.10 Cold blowing gas
Gas used to cool the adsorbent.
2.0.11 Glycol hydraulic pump
A pump that uses the rich glycol from the bottom of the absorption tower (device) and part of the natural gas as driving power to return the low-pressure lean glycol to the absorption tower (device). 2
2.0.12 Hydrate inhibitors
Chemical agents to prevent the formation of hydrates.
2.0.13 Absorbents
Liquids that absorb water during the absorption process. 3
3 General provisions
3.1 Dehydration methods and depth
3.1.1 Natural gas dehydration equipment includes gas well gas dehydration and associated gas dehydration. The setting of dehydration equipment should be determined by economic comprehensive comparison based on the oil and gas field development plan, the pressure and structure of natural gas in the oil and gas gathering and transportation system, the gas source conditions, regional conditions, and the dehydration depth required by users, etc. The advanced and reasonable dehydration method is determined. 3.1.2 The absorption method and adsorption method in this specification mainly use the control of natural gas water dew point. Low temperature dehydration can control water dew point and hydrocarbon dew point at the same time. 3.1.3 Calcium chloride dehydration is suitable for high-pressure natural gas in remote areas, and is suitable for occasions with high hydrogen sulfide and carbon dioxide content: it can be selected according to specific circumstances. This specification does not include this content.
3.1.4 Unified planning and reasonable layout. The dehydration of pipeline natural gas should be combined with the natural gas condensate recovery device, and comprehensive consideration should be given to determine the reasonable dehydration depth. 3.1.5 The determination of the dehydration depth should meet the following requirements: 3.1.5.1 Meet the requirements of users.
3.1.5.2 The water dew point of pipeline natural gas should be 5~7℃ lower than the lowest temperature of the pipeline environment at the starting transmission pressure.
3.1.5.3 For the natural gas condensate recovery device, the water dew point should be 5~7℃ lower than the lowest refrigeration temperature.
3.1.6 An inlet separator should be set before the raw gas enters the dehydrator. The inlet separator generally adopts a conventional gravity separator, and a mist collector should be set before the gas outlet to remove all droplets with a diameter of more than 10m. Calculate according to Appendix B. Natural gas containing asphalt colloid particles, dust or corrosion products should use a filter separator to prevent liquid from entering the dehydrator and the amplification machine. Antifreeze facilities should be installed in the separator in the cold region. 3.1.7 The pipelines, valves and liquid collection bags for recovering water-containing liquids should be heated and insulated, and the pipelines should be installed with a certain slope.
3.1.8 Condensate should be fully recovered. If it cannot be stored and transported in a closed manner, it must be stabilized. 3.1.9 Methanol should not be injected upstream of the waste and adsorption dehydration devices to avoid leakage into the air.
3,2 Energy utilization and processing capacity
3.2.1 The pressure energy of natural gas should be fully utilized, including the wellhead pressure of gas separation and the pressure of the associated gas separator.
3.2.2 The setting of the dehydration device should be considered in a coordinated manner with the gathering and transportation system, and the dispersed small gas volume should be concentrated for dehydration. Low-pressure natural gas can be pressurized and collected according to the gas supply needs and then dehydrated.
3.2.3 In the case of gas engines as power, the waste heat discharged by the engine should be utilized. 3.2.4 The processing capacity of the dehydration device is calculated according to the daily processing volume specified in the task book or contract, and the annual working time of the dehydration device matched with the natural gas condensate recovery arm is 800. The annual working days to solve the problem of pipeline gas transmission without freezing and blocking should be determined according to the pipeline gas transmission conditions, location and local climate conditions.
3.3 Water content of natural gas
3.3.1 The water content of natural gas and the conditions for hydrate formation are shown in Appendix A. 3.4 Environmental protection
3.4.1 The environmental protection design of the dehydration device should comply with the current "Environmental Protection Design Code for Oil and Gas Field and Long-distance Pipeline Construction Projects" and the standards of the local environmental protection department. 3.5 Corrosion and its control
51 Sour natural gas should be desulfurized first and then dehydrated. For natural gas far away from desulfurization, free water may be generated during pipeline transportation, and it can also be dehydrated first: then desulfurized. 3.5.2 When the carbon dioxide partial pressure in the gas phase of acidic natural gas is greater than or equal to 0.021MPa or the sulfide oxygen partial pressure is very high: and electrochemical corrosion will occur, the equipment must take anti-corrosion measures. The calculation method of sulfide partial pressure should comply with the current "Requirements for Metal Materials for Anti-Sulfide Stress Cracking of Tianyi Gas Ground Facilities". 3.5.3 For glycol absorption dehydration, when the carbon dioxide partial pressure in the gas phase is less than 0.021MPa, no corrosion control is required. When the carbon dioxide partial pressure is between 0.021 and 0.21MPa, corrosion control should be adopted. The pH value of the glycol solution can be adjusted or corrosion inhibitors can be injected. Corrosion-resistant materials can also be used. When the carbon dioxide partial pressure is greater than 0.21MPa, the equipment must take anti-corrosion measures.
3.5.3.1 After dehydration, the gas, lean glycol, and glycol buffer tank can be considered to be free of corrosion. 3.5.3.2 The H value of rich glycol liquid should be controlled to 7.0~~8.0, preferably 7.07.5, and the maximum should not exceed 8.0. If the conditions are severe, the bottom of the absorption tower should be protected by an inner coating or sacrificial anode, a filter made of special materials should be used, and corrosion testing should be carried out. 3.5.3.3 The reboiler has mild corrosion. If commercial substances are generated and accumulated, corrosion generally occurs at the bottom of the reboiler shell and the fire tube. 3.5.3.4 There is water or glycol condensate containing water in the regeneration tower and the top pipeline, and the corrosion is serious. In the area where corrosion exists, corrosion-resistant metals are used, and the packing in the fine retention tower should be made of corrosion-resistant materials.
3.5.4 It is strictly forbidden to string oxygen into the dehydration system. The working space of the glycol buffer tank or glycol storage tank is sealed with slightly positive pressure dry natural gas or nitrogen. 3.5.5 For dehydration by adsorption, if carbon dioxide is contained in the regeneration, the regeneration gas cooler should have anti-corrosion measures.
3.6, 1 Small and medium-sized devices should be skid-mounted as a whole or in sections. 3.6.2 The skid load should be designed to be 150% of the net weight of all equipment and components. Its deflection should not exceed 1/400 of the length of the skid.8 Condensate should be fully recovered. If it cannot be stored and transported in a closed manner, it must be stabilized. 3.1.9 Methanol should not be injected upstream of the waste and adsorption dehydration devices to avoid leakage into the air.
3,2 Energy utilization and processing capacity
3.2.1 The pressure energy of natural gas should be fully utilized, including the wellhead pressure of gas separation and the pressure of the associated gas separator.
3.2.2 The setting of the dehydration device should be considered in a coordinated manner with the gathering and transportation system, and the dispersed small gas volume should be dehydrated in a centralized manner. Low-pressure natural gas can be pressurized and gathered according to the gas supply needs and then dehydrated.
3.2.3 In the case of gas engines as power, the waste heat discharged by the engine should be utilized. 3.2.4 The processing capacity of the dehydration device is calculated according to the daily processing volume specified in the task book or contract, and the annual working time of the dehydration device equipped with the natural gas condensate recovery arm is 800. The annual working days to solve the problem of pipeline gas transmission without freezing and blockage should be determined according to the pipeline gas transmission conditions, location and local climatic conditions.
3.3 Water content of natural gas
3.3.1 The water content of natural gas and the conditions for hydrate formation are shown in Appendix A. 3.4 Environmental protection
3.4.1 The environmental protection design of the dehydration cover shall comply with the current "Environmental Protection Design Code for Oil and Gas Field and Long-distance Pipeline Construction Projects" and the standards of the local environmental protection department. 3.5 Corrosion and its control
51 Sour natural gas should be desulfurized first and then dehydrated. For natural gas far from desulfurization, free water may be generated during pipeline transportation, and it can also be dehydrated first and then desulfurized. 3.5.2 When the carbon dioxide partial pressure in the gas phase of sour natural gas is greater than or equal to 0.021MPa or the sulfide oxygen partial pressure is very high and electrochemical corrosion will occur, the equipment must take anti-corrosion measures. The calculation method of sulfide partial pressure shall comply with the current "Requirements for Metal Materials for Anti-sulfurization Stress Cracking of Tianyi Gas Ground Facilities". 3.5.3 For dehydration by glycol absorption method, when the carbon dioxide partial pressure in the gas phase is less than 0.021MPa, corrosion control is not required. When the carbon dioxide partial pressure is between 0.021 and 0.21MPa, corrosion control should be adopted. The pH value of the glycol solution can be adjusted or corrosion inhibitors can be injected. Corrosion-resistant materials can also be used. When the carbon dioxide partial pressure is greater than 0.21MPa, anti-corrosion measures must be taken for the equipment.
3.5.3.1 After dehydration, the gas, lean glycol, and glycol buffer tank can be considered to be free of corrosion. 3.5.3.2 The H value of the glycol-rich liquid should be controlled to 7.0~8.0, preferably 7.07.5, and the maximum should not exceed 8.0. If the conditions are severe, the bottom of the absorption tower should be protected by an inner coating or sacrificial anode, a filter of special materials should be used, and corrosion testing should be carried out. 3.5.3.3 The reboiler has slight corrosion. If mercury is generated and accumulated, the corrosion usually occurs at the bottom of the reboiler shell and the fire tube. 3.5.3.4 There is water or glycol condensate containing water in the regeneration tower and the tower top pipeline, which is seriously corroded. In the area where corrosion exists, corrosion-resistant metals are used, and the fillers in the fine retention tower should be made of corrosion-resistant materials.
3.5.4 It is strictly forbidden to enter the dehydration system with oxygen. The working space of the glycol buffer tank or glycol storage tank is sealed with slightly positive pressure dry natural gas or nitrogen. 3.5.5 For dehydration by adsorption, if carbon dioxide is contained in the regeneration, the regeneration gas cooler should have anti-corrosion measures.
3.6, 1 Small and medium-sized devices should be skid-mounted as a whole or in blocks. 3.6.2 The skid load should be designed according to 150% of the net weight of all equipment and components. Its deflection should not exceed 1/400 of the length of the sliding cover.8 Condensate should be fully recovered. If it cannot be stored and transported in a closed manner, it must be stabilized. 3.1.9 Methanol should not be injected upstream of the waste and adsorption dehydration devices to avoid leakage into the air.
3,2 Energy utilization and processing capacity
3.2.1 The pressure energy of natural gas should be fully utilized, including the wellhead pressure of gas separation and the pressure of the associated gas separator.
3.2.2 The setting of the dehydration device should be considered in a coordinated manner with the gathering and transportation system, and the dispersed small gas volume should be dehydrated in a centralized manner. Low-pressure natural gas can be pressurized and gathered according to the gas supply needs and then dehydrated.
3.2.3 In the case of gas engines as power, the waste heat discharged by the engine should be utilized. 3.2.4 The processing capacity of the dehydration device is calculated according to the daily processing volume specified in the task book or contract, and the annual working time of the dehydration device equipped with the natural gas condensate recovery arm is 800. The annual working days to solve the problem of pipeline gas transmission without freezing and blockage should be determined according to the pipeline gas transmission conditions, location and local climatic conditions.
3.3 Water content of natural gas
3.3.1 The water content of natural gas and the conditions for hydrate formation are shown in Appendix A. 3.4 Environmental protection
3.4.1 The environmental protection design of the dehydration cover shall comply with the current "Environmental Protection Design Code for Oil and Gas Field and Long-distance Pipeline Construction Projects" and the standards of the local environmental protection department. 3.5 Corrosion and its control
51 Sour natural gas should be desulfurized first and then dehydrated. For natural gas far from desulfurization, free water may be generated during pipeline transportation, and it can also be dehydrated first and then desulfurized. 3.5.2 When the carbon dioxide partial pressure in the gas phase of sour natural gas is greater than or equal to 0.021MPa or the sulfide oxygen partial pressure is very high and electrochemical corrosion will occur, the equipment must take anti-corrosion measures. The calculation method of sulfide partial pressure shall comply with the current "Requirements for Metal Materials for Anti-sulfurization Stress Cracking of Tianyi Gas Ground Facilities". 3.5.3 For dehydration by glycol absorption method, when the carbon dioxide partial pressure in the gas phase is less than 0.021MPa, corrosion control is not required. When the carbon dioxide partial pressure is between 0.021 and 0.21MPa, corrosion control should be adopted. The pH value of the glycol solution can be adjusted or corrosion inhibitors can be injected. Corrosion-resistant materials can also be used. When the carbon dioxide partial pressure is greater than 0.21MPa, anti-corrosion measures must be taken for the equipment.
3.5.3.1 After dehydration, the gas, lean glycol, and glycol buffer tank can be considered to be free of corrosion. 3.5.3.2 The H value of the glycol-rich liquid should be controlled to 7.0~8.0, preferably 7.07.5, and the maximum should not exceed 8.0. If the conditions are severe, the bottom of the absorption tower should be protected by an inner coating or sacrificial anode, a filter of special materials should be used, and corrosion testing should be carried out. 3.5.3.3 The reboiler has slight corrosion. If mercury is generated and accumulated, the corrosion usually occurs at the bottom of the reboiler shell and the fire tube. 3.5.3.4 There is water or glycol condensate containing water in the regeneration tower and the tower top pipeline, which is seriously corroded. In the area where corrosion exists, corrosion-resistant metals are used, and the fillers in the fine retention tower should be made of corrosion-resistant materials.
3.5.4 It is strictly forbidden to enter the dehydration system with oxygen. The working space of the glycol buffer tank or glycol storage tank is sealed with slightly positive pressure dry natural gas or nitrogen. 3.5.5 For dehydration by adsorption, if carbon dioxide is contained in the regeneration, the regeneration gas cooler should have anti-corrosion measures.
3.6, 1 Small and medium-sized devices should be skid-mounted as a whole or in blocks. 3.6.2 The skid load should be designed according to 150% of the net weight of all equipment and components. Its deflection should not exceed 1/400 of the length of the sliding cover.
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