SY/T 5324-1994 Prestressed Insulated Oil Pipe

SY/T 5324-1994 Prestressed Insulated Oil Pipe SY/T5324-1994 Standard Download Decompression Password: www.bzxz.net

SY/T 5324--94, Petroleum and Natural Gas Industry Standard of the People's Republic of China
Prestressed Insulated Oil Pipe
Published on January 18, 1995
China National Petroleum Corporation
Implemented on July 1, 1995
Subject Content and Scope of Application
Petrol and Natural Gas Industry Standard of the People's Republic of China Prestressed Insulated Oil Pipe
SY/T 532494
Replaces SY5324-88
This standard specifies the product classification of prestressed insulated oil pipes for heat injection in oil fields: technical requirements, test methods: inspection rules and marking, packaging, transportation and storage.
This standard applies to the production and product quality inspection of prestressed insulated oil pipes for steam injection. Cited standards
GB1300
GB3198
GB3323
GB 5117
GB 5118
Stainless steel welding rod
Steel wire for welding
Industrial pure aluminium foil
Radiography and quality grading of steel fusion welding butt jointsCarbon steel welding rod
Low alloy steel welding rod
GB 9253.2
GB 9253.3
3 Terminology
Petroleum casing thread
Petroleum oil pipe thread
3.1 Maintenance allowance
After the pipe end (thread) of prestressed insulated oil pipe is damaged during use: the length of the thread that can be trimmed and reprocessed. Generally, each end is 20~25mm.
3.2 Apparent thermal conductivity
The heat transferred in the insulation layer of the prestressed insulated oil pipe by conduction, convection and radiation is regarded as the heat transferred by pure conduction of a hypothetical solid with the same insulation thickness. The thermal conductivity of the "hypothetical solid" is called the "apparent thermal conductivity". 4 Product classification
4.1 Product grade
Prestressed insulated oil pipes are divided into five grades according to their apparent thermal conductivity, see Table 1. Table 1
Insulation performance grade
Apparent thermal conductivity (2)
Insulation performance grade
Apparent thermal conductivity (2)
0.08 ^0.06
0.0220.006
4.2 Product structure and size
The structure of prestressed insulated oil pipe is shown in Figure 1, and its main dimensions are shown in Table 2. Approved by China National Petroleum Corporation on January 18, 1995 Bwww.bzxz.net
0.06 2 - 0.04
0.006 >0.002
0.04>/>0.02
Implemented on July 1, 1995
88× 40
88x 50
114×62
127× 62
172× 76
4.3 Product code
Outer diameter of outer tube
Inner diameter of inner tube
SY/T532494
Outer diameter of coupling
Connecting thread
Serrated thread
Serrated thread
Partial trapezoidal thread
Partial trapezoidal thread
Trapezoidal thread
Length range
9000～10000
1-coupling; 2-inner tube: 3-rightening ring: 4-insulation material: 5～Maintenance margin of outer tube
The product code of prestressed insulation oil is composed of four parts. The first part is the letter YG (pre-insulation), and the second part indicates the product specification (the integer value of the outer diameter of the outer tube × the integer value of the inner diameter of the inner tube). ), the third part indicates the maximum depth of the pipe string that can be lowered into the well (in units of 100m), and the fourth part indicates the grade of the prestressed insulation oil arm. The second and third parts are separated by a multiplication sign. Example: YG114x62×12C
indicates a Class C prestressed insulation oil pipe with an outer diameter of 114.3mm, an inner diameter of 62.0mm, and a maximum depth of 1200nl that can be lowered into the well.
5 Technical requirements
5.1 Working condition requirements
The product should meet the working condition of the injection heat carrier temperature of 350℃. Requirements include yield strength, tensile strength, Morse modulus, elongation, resistance to internal pressure, resistance to external extrusion and tensile load (see Qiu 3 for resistance to internal pressure and external extrusion load). Table 3
88×40
88 × 50)
114× 63
127× 62
127× 76
Resistance to internal pressure
Resistance to external extrusion
5.2 Product thermal insulation performance level
SY/ T 5324-94
The thermal insulation performance level of the product shall comply with the provisions of Table 1. 5.3 Material requirements
5.3.1 The pipe material shall comply with the provisions of casing and oil pipe. 5.3.2 The thermal insulation material aluminum box shall comply with the requirements of GB3198. 5.3.3 The welding rods for welding inner and outer pipes shall comply with the requirements of GB983, GB1300, GRS117 and GB5118. 5.4 Prestressing process requirements
5.4.1 The theoretical pre-extension must be calculated for each tube according to the design requirements. The allowable deviation between the actual pre-elongation value and the theoretical pre-elongation value is ± lmm
5.4.2 The prestressing treatment process must be implemented by heating method, and mechanical method should not be used to avoid damaging the inner pipe. 5.5 Processing requirements
5.5.1 The outer surface of the inner pipe and the inner surface of the outer pipe should be free of rust and dirt after treatment, and all metal colors should be visible, dry, and welded after assembly. 5.5.2 The welding process must be evaluated for the type of steel, welding materials, welding methods and welding processes, and welding process regulations must be compiled.
5.5.3 The pipe end connection thread should comply with the requirements of GB9253.2 and GB9253.3. 5.6 Tensile load
For non-standard pipe strings, the tensile load is determined by the depth of the well. See Table 4. Table 4
88×40
114× 62
127× 62
127× 76
≤2000
≥2000
Insulation layer
The insulation layer of prestressed insulated oil pipe should be vacuum treated or vacuumized and then backfilled with inert gas, and hydrogen absorbent should be used. Insulation life of prestressed insulated oil pipe
5.8.1 If the apparent thermal conductivity of the old insulated oil pipe after being lifted out after steam injection is not higher than 1.2 times of that of the new pipe, it is considered that the insulation performance is still reliable and can be used.
5.8.2 When the prestressed insulated oil pipe is used in steam-throwing wells, its thermal life shall not be less than 3 huff-and-puff cycles: When the prestressed insulated oil pipe is used in steam-throwing wells, its insulation life shall not be less than 2 years. 5.9 Product straightness
5.9.1 Locally not more than 0.1%, total length not more than 0.06%5.9.2 Straightness test uses three steel wires (diameter 0.5 ~ 1.2mm) parallel to the heat-insulated oil pipe, slowly approaching the heat-insulated oil pipe under the action of the synchronous rotation drive mechanism, and the heat-insulated oil pipe also slowly rotates to measure the maximum straightness of the heat-insulated oil pipe. 6 Test method
6.1 Mechanical property test
SY/ T 5324-94
6.1.1 The pipes of the inner and outer pipes must be subjected to high-temperature mechanical property tests, and the test contents include yield strength, tensile strength, Young's modulus and elongation. There should be no less than 5 temperature measurement points, the lowest temperature is 20℃, and the highest is 400℃. The test piece is first taken from the pipe in strip form and tested according to the requirements of the mechanical test standard.
6.1.2 The tensile load test at room temperature shall be in accordance with the design requirements, and the test parameters for the internal pressure resistance at temperature and the external water pressure resistance at temperature shall be in accordance with the requirements of Table 3. 6.2 Thermal insulation performance test
6.2.1 Inspection device
The thermal insulation performance of the insulation oil arm shall be determined by the steady-state heating method, and electric heating is recommended. The inspection device shall have the function of automatic control of both temperature and heating power. In order to ensure the measurement accuracy, a microcomputer for automatic data collection and processing can be configured. 6.2.2 Inspection method
6.2.2.1 The temperature measurement points shall be evenly distributed over the entire test length, and shall not be less than 5 points. 6.2.2.2 Inspect the apparent thermal conductivity coefficient when the inner wall temperature is 150, 200, 250, 300 and 350℃ respectively. 6.2.2.3 The apparent thermal conductivity coefficient of the product shall be based on the value calculated according to the reference A (reference part) under the conditions of the inner wall temperature of 350℃ and the ambient temperature of room temperature.
6.3. Diameter test
The inner diameter of the product should be able to pass the diameter gauge freely. The diameter gauge size is shown in Table 5. Table 5
Inner diameter of inner pipe
7. Inspection rules
Type inspection
Standard diameter gauge
After the new product is put into production, the old product is transferred to another factory for production, the structure is improved for production, or the cumulative production is 10,000m: type inspection must be carried out, and 5 pieces are sampled each time. The test is carried out in accordance with 6.1.1 and 6.1.2, and shall meet the requirements of Table 3. 7.2. Factory inspection
7.2.1 The product connection thread shall be 100% inspected by qualified oil pipe thread gauges and casing thread gauges. 7.2.2 The axial tensile load shall be tested at room temperature, the internal pressure resistance and external extrusion resistance shall be tested at room temperature by water pressure, and the thermal insulation performance can only be tested at room pressure and commercial temperature. Randomly sample 2 pieces for every 200 pieces, and 2 pieces shall be sampled for less than 200 pieces. 7.2.2.1 Products that pass the random inspection are allowed to leave the factory.
7.2.2.2 Products that fail the random inspection shall be re-inspected 100%; products that pass the re-inspection are allowed to leave the factory, and products that fail the re-inspection are scrapped on the spot.
7.2.3 Welds must be 100% optically inspected and meet the requirements of GB3323. 4
8 Marking, packaging, transportation and storage
8.1 Marking
SY/ T 5324--94
8.1.1 The product name code, production number and factory name shall be stamped with steel stamps along the axial direction at 80mm from the coupling. 8.1.2 The product code and factory name shall be stamped with module paint at 0.51m from the coupling. 8.1.3 Each batch of products shall be accompanied by a certificate of inspection. The certificate of inspection shall comply with the provisions of Table 6. Table 6×××" Insulated oil pipe certificate (format) Product code
Mass, kg
Length m
8.2 Packaging
The outer surface of the product should be cleaned of rust and dirt, and painted 8.2.2
Output number
Connection thread
Specification Thermal conductivity, w/(m·)
The product should be supported by four points evenly distributed, thick insulation boards should be placed between layers, tied with steel belts, and the hoisting position should be marked. 8.2.3 Two operating instructions are provided for each batch of products 8.3 Transportation
8.3.1 The product should be placed flat with four points evenly distributed contact, transportation, and installation. It is not allowed to support at both ends and suspend in the middle. 8.3.2 The product is strictly prohibited from collision and must be placed carefully. 8.4 Storage
8.4.1 The product should be stored on a pipe bridge with four points evenly distributed support 0.51m above the ground. 8.4.2
During storage, the connecting threads should be coated with anti-rust grease and protected with thread protectors. The products should be stored in a shed.
A1 Principle formula
A2 Test formula
A3 Approximate formula
A4 Regression formula
SY/ T 5324--94
Appendix A
Calculation of apparent thermal conductivity
(reference)
2-yuan L(t,—,)
2-yuan L(t,-t)
In(D,D,/ DD,)
2-yuan L(t,- tg)
In formulas A1 to A4: —Apparent thermal conductivity, W/(m·C):….Thermal conductivity of pipe, w/(m·℃)
Effective heating length of test section, n:
Q—Effective steady-state heating power of test section, WInner wall temperature of inner tube, “C;
—Inner wall temperature of inner tube, ℃;
Inner wall temperature of outer tube, ℃;
t4—Outer wall temperature of outer tube, ℃;
Inner diameter of inner tube, mm;
Inner diameter of inner tube, mm;
Inner diameter of outer tube, mm;
Outer diameter of outer tube, mm
Average temperature,
Additional instructions:
SY/ T 532494
This standard was proposed and managed by the Oil and Gas Production Professional Standardization Committee. This standard was jointly drafted by the Oil Production Technology Research Institute of Shengli Shixiu Administration and the Mechanical Department of Petroleum University. The main drafters of this standard are Zhao Zhengqi, Wang Mikang, Zhang Yi, and Wang Shihu.
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