Some standard content:
ICS 75.200
Registration number: 10472—2002
Petroleum and natural gas industry standard of the People's Republic of China SY/T 6535---2002
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The underground storage well for high - compression gas
The underground storage well for high - compression gas2002-05-28 Issued
State Economic and Trade Commission
2002-08-01 Implementation
2Normative reference documents
3Terms
Structural type and parameters
5Requirements
6Acceptance method
? Inspection rules
8 marking, painting (wellhead device)
Appendix A (normative appendix) Air tightness test pressure drop (due to temperature change) calculation formula SY/T 6535-2002
SY/F 6535-—2002
With the construction of a large number of compressed natural gas (CNG) filling stations and civilian natural gas peak-shaving stations, their gas storage systems and high-pressure gas underground gas storage wells have also been widely used. In order to better utilize and standardize high-pressure gas underground gas storage, this standard is specially formulated on the basis of the original natural gas and construction.
Appendix A of this standard is a normative appendix. This standard is proposed and managed by the Oil and Gas Field and Pipeline Construction Design Professional Standardization Committee. The drafting unit of this standard: Sichuan Chuanyou Natural Gas Technology Development Co., Ltd. The main drafters of this standard are: Chen Lifeng, Li Kuixia, Liao Xiaofeng, Wu Yongqiao, Chen Wenzhong, and Yang Tingzhi. 1 Scope
High-pressure underground gas storage wells
SY/T 6535—2002
This standard specifies the structural type, technical requirements, acceptance methods, inspection rules and marking, painting, etc. of compressed natural gas underground gas storage wells (simply compressed gas storage wells).
This standard is applicable to the design, construction, acceptance and inspection of gas storage wells with a nominal pressure of 25MIa (gauge pressure) and a nominal penetration of 1m--10n3. Gas storage wells constructed according to this standard are applicable to the storage of natural gas that complies with the provisions of (B18047 "Compressed Natural Gas for Vehicles": other uses and non-corrosive gases may be used as reference. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply. Versions applicable to this standard, GB18047-2000 Compressed natural gas for vehicles
SY0466-97 Specification for construction and acceptance of natural gas gathering and transmission pipelines SYT5127-2002, Specification for wellhead equipment and Christmas trees SY/T5412-1996 Casing operation procedures SY/T5447-92 Non-destructive detection method for well pipes Supermarket test SY/T5587.8-93 Conventional well repair operations for oil and water well opening, string finding, sealing, and inspection and application operation procedures SHI22-90 Specification for anti-corrosion design and construction of coatings for equipment and pipelines in non-oil chemical enterprises API Sper: SCT
3 Terms
The following terms and definitions apply to this standard. 3.1
Gas storage wellstoragewell
Vertical shaft used to store compressed natural gas in a compressed natural gas filling station3.2
Wellbore
A cylinder connected by casing.
4 Structural type and parameters
4.1 Structural type
The gas storage well consists of a wellhead device, a bottom wellhead and a wellbore, as shown in Figure 14.2 Basic parameters
The nominal volume of gas storage and the outer diameter of the non-cylinder should comply with the provisions of Table 1. 1
SY/T 6535—2002
Nominal volume, m
Outer diameter of well casing, mm
Rated working pressure, MPa
4.3 Product code and marking method
5 Requirements
5.1 Well site selection
Gas inlet
Wellhead device
+exhaust
Ground level
Oil well water
Bottom well head
Basic parameter table
$177.60~ $273.10
Rated working pressure, HPa
Nominal volume, "
Product code
The location of the gas well should be selected in the gas station, but it should not be built in the surface sliding zone. 5.2 Drilling
5.2.1 Soft formations should be reinforced with steel pipes as the surface layer, with a depth of 3m to 5rl from the ground. 5.2.2 The degree of parallel inclination should be controlled: the maximum well inclination is not more than 2°5.3 Bottom head, wellbore, parallel port device
5.3.1 Bottom head
Well The actual tensile strength of the bottom head material should not be greater than 880MIPa, and the actual service strength ratio should not exceed .90; the number of fatigue cycles should be no less than 2.5×104 times; the tightening torque of the connection with the wellbore should comply with the provisions of SY/T5412, and the connection between the bottom head and the wellbore should be sealed without leakage.
5.3.2 Well casing
5.3.2.1 The casing should be in accordance with the requirements of APISpcc5CT, the casing steel grade should be TP80CQ], the actual service strength of the material should be 552MPa~~758MPa, the actual tensile strength should be 689MPa--862MPa, the number of fatigue cycles should be no less than 2.5×104 times, 5.3.2.2 The casing down to the well has quality certification documents, pressure test qualification report, quality certificate and other documents indicating that its quality fully meets the design requirements.
5.3.2.3 The casings should be arranged and numbered before being put together. At the same time, the length of each casing should be checked and recorded. 5.3.2.4 The casings should not be wrongly screwed when being put together. The screw-on torque should comply with the provisions of $Y/15412. 5.3,2.5 The connecting threads between the casings should be sealed with casing sealing grease. 5.3.3 Wellhead installation
5.3.3.1 The actual tensile strength of the material of the parallel port device should not be greater than 880MPa, and the actual yield strength ratio should not exceed 0.90; the number of fatigue cycles should be no less than 2.5×104 times: the connection with the parallel port 1 torque should comply with the provisions of SY/T5412: the connection with the parallel tube should be sealed and there must be no leakage,
5.3.3.2 The sealing type of the internal sealing part of the parallel port device should comply with the provisions of SY7T5127. 5.3.3.3 Well [1 The upper end surface of the device should be 300mm~500mm above the ground. 5.3.3.4 The inlet of the wellhead device should be equipped with a stop valve, a pressure gauge and a drainage device. 5.4 Cementing
The deformed space between the cylinder and the well wall should be sealed with oil well cement slurry. 6 Acceptance method
6.1 Strength test and tightness test should be carried out during acceptance. 6.2 Test medium: Clean water is used for strength pressure test, and dry natural gas or air is used for tightness pressure test. 6.3 Strength test: The strength test pressure is 1.5 times the rated working pressure. It is qualified if there is no leakage for 4 hours. The test process should be carried out according to the provisions of SY0466. The liquid should be drained after the pressure test is completed. 6.4 Tightness test: A tightness test is carried out after the strength test is qualified. The tightness test pressure should be the rated working pressure. It is qualified if there is no leakage for 24 hours. Calculate according to the formula in Appendix A. For the pressure drop caused by temperature, A is not more than 1% to be qualified. The test process shall be carried out in accordance with the provisions of SY0456. 6.5 For coal and replacement: After the strength test and tightness test are qualified, the inside of the coal and the shell shall be dried, especially the free water is qualified. After the air pressure test, nitrogen shall be used for replacement, and the replacement volume shall not be less than the volume of the gas storage well. 7 Inspection rules
7.1 General inspection
7.1.1 Inspection cycle
The inspection cycle is two years,
7.1.2 Inspection items
7.1.2.1 Appearance inspection
Regularly check whether the wellhead device is damaged, leaking or severely rusted. 7.,1.2.2 Tightness test
Test and evaluate according to Article 6.4 of this standard. 7.2 Comprehensive inspection
7.2.1 Inspection cycle
The inspection cycle is six years.
7.2.2 Inspection items
7.2.2.1 Appearance inspection
Perform according to the requirements of Article 7.1.2.1 of this standard. 7.2.2.2 Strength test
$Y/T 6535—2002
Perform the test and assessment according to the requirements of Article 6.3 of this standard. 7.2.2.3 Tightness test
Perform according to the requirements of Article 6.4. Test and evaluate according to the requirements of Article 4. 7.2.2.4 Test and inspection of the cylinder
Test according to the provisions of SY/T5447: 7.3 Repair
If the test fails, repair and replace according to the provisions of SY/T5587.8. 7.4 Test record
Records of the tests, pressure tests and repairs should be kept and filed. 5 Scrap
Gas storage that fails the above tests and cannot be repaired and has been in use for 25 years should be scrapped. 8 Marking and painting (wellhead equipment)
8.1 Marking
There should be a nameplate on the gas storage and wellhead equipment, and the following content should be indicated: 8.1.1 Marked with the words "High-pressure gas underground gas storage well". 8.1.2 Gas storage well model (marked according to the provisions of Article 4.3 of this standard): 8.1.3 Main technical parameters.
8.1.4 Construction unit
8.1.5 Construction unit address.
8.1.6 Construction month:
8.2 Painting
The painting of the parallel port device shall comply with the provisions of SHI22-904
Appendix A
【Normative Appendix】
Calculation formula for pressure drop in air tightness test [due to temperature change] The pressure drop caused by temperature change in the air pressure test is calculated according to the following formula. ×）×100%
p. = pal + p.2
p, = zl + pzbZxz.net
Wherein:
Ap-pressure drop;
-absolute pressure of gas at the end of pressure stabilization, MPa; absolute pressure of gas at the beginning of pressure stabilization, MPa; T——absolute temperature of gas in the tube at the beginning of pressure stabilization, K; r,
-absolute temperature of gas in the tube at the end of pressure stabilization, K; pressure reading (gauge pressure) at the beginning and end of pressure stabilization, MPa; P
local atmospheric pressure at the beginning and end of pressure stabilization, MPanSY/T6535—2002
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