Product classification
Thickened oil pipe insulation pipeline, large-diameter petroleum casing pipeline pipe
Thickened oil pipe 73 × 5.51 EUE N80 Description: Oil pipe Standards: API SPEC 5CT, API SPEC 5B, ISO 11960 Usage: Tubing is used for extracting oil or natural gas from oil wells. With the development of the oil extraction industry and the increasing reduction of oil resources, the exploration field is constantly expanding, and the depth of oil wells is increasing. Therefore, in recent years, the demand for oil casing has not only increased in quantity, but also put forward higher and stricter requirements for its quality. For example, when mining deep oil wells, due to the increase in the weight of the oil pipe, the joint of the oil pipe must withstand greater tensile stress, thus requiring high strength; Sometimes, due to the needs of oil recovery technology, high-pressure water or gas is often injected through the oil pipe, and sometimes acid is also injected for acidification treatment to increase oil recovery. Therefore, the oil pipe also needs to bear a large internal pressure. So the quality requirements for oil pipes, especially their joints, are quite strict. Faced with the aforementioned working conditions, thickened oil pipes at the pipe ends have emerged.
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Thickened oil pipe 73 × 5.51 EUE N80 Description: Oil pipe Standards: API SPEC 5CT, API SPEC 5B, ISO 11960 Usage: Tubing is used for extracting oil or natural gas from oil wells. With the development of the oil extraction industry and the increasing reduction of oil resources, the exploration field is constantly expanding, and the depth of oil wells is increasing. Therefore, in recent years, the demand for oil casing has not only increased in quantity, but also put forward higher and stricter requirements for its quality. For example, when mining deep oil wells, due to the increase in the weight of the oil pipe, the joint of the oil pipe must withstand greater tensile stress, thus requiring high strength; Sometimes, due to the needs of oil recovery technology, high-pressure water or gas is often injected through the oil pipe, and sometimes acid is also injected for acidification treatment to increase oil recovery. Therefore, the oil pipe also needs to bear a large internal pressure. So the quality requirements for oil pipes, especially their joints, are quite strict. Faced with the aforementioned working conditions, thickened oil pipes at the pipe ends have emerged.
With the development of the oil extraction industry and the increasing reduction of oil resources, the exploration field continues to expand, and the depth of oil wells is increasing (such as the depth of oil wells in the United States has reached over 10000m). Therefore, in recent years, the demand for oil casing has not only increased in quantity, but also put forward higher and stricter requirements for its quality. For example, when mining deep oil wells, due to the increase in the weight of the oil pipe, the joint of the oil pipe must withstand greater tensile stress, thus requiring high strength; Sometimes, due to the needs of oil recovery technology, high-pressure water or gas is often injected through the oil pipe, and sometimes acid is also injected for acidification treatment to increase oil recovery. Therefore, the oil pipe also needs to bear a large internal pressure. So the quality requirements for oil pipes, especially their joints, are quite strict. Faced with the aforementioned working conditions, thickened oil pipes at the pipe ends have emerged.
Some developed countries in the world, such as the United States and the former Soviet Union, have adopted the method of locally heating and forging hollow steel pipes at the ends to produce thickened oil pipes, while China is still using the method of directly processing threads at the ends of seamless steel pipes. This method reduces the thickness of the pipe wall and the effective load-bearing area, thereby reducing the connection strength at the joints. The produced oil pipes have a short lifespan, high safety hazards, and are difficult to meet the growing needs of the petroleum industry. The oil pipe produced by forging method can ensure the strength and good performance at the joint. Therefore, adopting this end thickened oil pipe has significant social and economic benefits.
Difficulty analysis of forging thickened oil pipes:
According to the traditional rules of pipe blank forging, when L/t ≤ 3, it can be freely roughened to any shape and size in one stroke of the machine; When Lo/1>3, polymer forging should be carried out, and the wall thickness change rule is: t,=4.5-1.3t1. Lo is the length of the deformed part of the pipe blank; T is the wall thickness of the tube blank, t=D-D inner)/2, D outer and D inner are the outer diameter and inner diameter of the tube blank, respectively; t>t1 is the wall thickness during the nth and n-1st forging, respectively.
According to this rule, the forging ratio for thickened oil pipes is very high. Products generally larger than 12 require multiple steps to complete, which is difficult to achieve in actual production. Due to the fact that the forging process of thickened oil pipes is often carried out on a flat forging machine, the installation space of the flat forging machine limits the number of forging steps; At the same time, using sensors for heating is limited by the matching of the heater aperture and the outer diameter of the tube blank, making it difficult to achieve a single heater to heat billets with different tube diameters. Moreover, multiple heating cycles increase the oxidation frequency, thicken the oxide skin, and are detrimental to the mold life and the filling ability of the mold cavity. In view of this, it is very difficult to complete the polymerization and final forming of thickened oil pipes in 2-3 steps at once.
In addition, during the machining and forging process of thickened oil pipes, due to the relatively thin and almost thin-walled wall of the pipe, the heat transfer is fast and the temperature drop is large in contact with the core shaft and mold cavity. At the end of a work step, a large clamping force is generated, which is easy to lock the core shaft and cause the core shaft to shrink or even be pulled out and the clamping slider to loosen under tensile stress.
Thickened oil pipe 73 × 5.51 EUE N80
Description: Oil pipe
Standards: API SPEC 5CT, API SPEC 5B, ISO 11960
Usage: Tubing is used for extracting oil or natural gas from oil wells.
Oil pipe specifications:
Size Code Weight code Outer diameter Wall thickness End processing form Steel grade Not thickened Extra thickness in mm in mm J55 L80-1 N80 C90 T95 P110 1.900" 2.40 - 1.900 48.26 0.125 3.18 PI - - - - - 2.75 2.90 1.900 48.26 0.145 3.68 PNUI PNUI PNUI PNUI PNUI - 3.65 - 1.900 48.26 0.200 5.08 PU PU PU PU PU PU 2 3/8" 4.00 - 2.375 60.32 0.167 4.24 PN PN PN PN PN - 4.00 4.70 2.375 60.32 0.190 4.83 PNU PNU PNU PNU PNU - 5.80 5.95 2.375 60.32 0.254 6.45 - PNU PNU PNU PNU PNU 6.60 - 2.375 60.32 0.259 7.49 - P - P P PNU 7.35 7.45 2.375 60.32 0.336 8.53 - PU - PU PU - 2 7/8" 6.40 6.50 2.875 73.02 0.217 5.51 PNU PNU PNU PNU PNU - 7.80 7.90 2.875 73.02 0.276 7.01 - PNU PNU PNU PNU PNU 8.60 8.70 2.875 73.02 0.308 7.82 - PNU PNU PNU PNU PNU 9.35 9.45 2.875 73.02 0.340 8.64 - PU - PU PU PNU 10.50 - 2.875 73.02 0.392 9.96 - P - P P - 11.50 - 2.875 73.02 0.440 11.18 - P - P P - 3 1/2" 7.70 - 3.500 88.90 0.216 5.49 PN PN PN PN PN - 9.20 9.30 3.500 88.90 0.254 6.54 PNU PNU PNU PNU PNU - 10.20 - 3.500 88.90 0.289 7.34 PN PN PN PN PN PNU 12.70 12.95 3.500 88.90 0.375 9.52 - PNU PNU PNU PNU - 14.30 - 3.500 88.90 0.430 10.92 - P - P P PNU 15.50 - 3.500 88.90 0.476 12.00 - P - P P - 17.00 - 3.500 88.90 0.530 13.46 - P - P P - 4" 9.50 - 4.000 101.60 0.226 5.74 PN PN PN PN PN - 10.70 11.00 4.000 101.60 0.262 6.65 PU PU PU PU PU - 4 1/2" 12.60 12.75 4.500 114.30 0.271 6.88 PNU PNU PNU PNU PNU - 15.20 - 4.500 114.30 0.337 8.56 - P - P P - 17.00 - 4.500 114.30 0.380 9.65 - P - P P - 18.90 - 4.500 114.30 0.430 10.92 - P - P P - 21.50 - 4.500 114.30 0.500 12.70 - P - P P - 23.70 - 4.500 114.30 0.560 14.22 P P P - 26.10 - 4.500 114.30 0.630 16.00 - P - P P - Note: P - Flat head; N - No thickening; U - external thickness; T& C - Car threaded band coupling; I - integral joint.
Mechanical properties:
Standard Brand Tensile strength（MPa） Yield strength（MPa） Elongation（％） Hardness API SPEC 5CT J55 ≥517 379～552 Table lookup K55 ≥517 ≥655 N80 ≥689 552～758 L80(13Cr) ≥655 552～655 ≤241HB P110 ≥862 758～965 Chemical composition:
Standard Brand Chemical composition（％） C Si Mn P S Cr Ni Cu Mo V Als API SPEC 5CT J55K55 (37Mn5) 0.34～0.39 0.20～0.35 1.25～1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20 / / ≤0.020 N80 (36 Mn2V) 0.34～0.38 0.20～0.35 1.45～1.70 ≤0.020 ≤0.015 ≤0.15 / / / 0.11～0.16 ≤0.020 L80(13Cr) 0.15～0.22 ≤1.00 0.25～1.00 ≤0.020 ≤0.010 12.0～14.0 ≤0.20 ≤0.20 / / ≤0.020 P110 (30CrMo) 0.26～0.35 0.17～0.37 0.40～0.70 ≤0.020 ≤0.010 0.80～1.10 ≤0.20 ≤0.20 0.15～0.25 ≤0.08 ≤0.020 Outer diameter, thickness, weight deviation
Dimensional deviation Project Allowable deviation External diameter Tube body D≤101.60mm±0.79mm D≥114.30mm +1.0% -0.5% wall thickness -12.5% Weight Single root +6.5% +3.5% Vehicle volume -1.75 Length range
Length Project Scope 1 Scope 2 Scope 3 Oil pipe 6.10-7.32m 8.53-9.75m - Bushing 4.88-7.62m 7.62-10.36m 10.36-14.63m 关键词:- Thickened oil pipe
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