CN111945073A - 110KSI thermal production casing pipe and manufacturing method thereof - Google Patents
110KSI thermal production casing pipe and manufacturing method thereof Download PDFInfo
- Publication number
- CN111945073A CN111945073A CN202010888224.6A CN202010888224A CN111945073A CN 111945073 A CN111945073 A CN 111945073A CN 202010888224 A CN202010888224 A CN 202010888224A CN 111945073 A CN111945073 A CN 111945073A
- Authority
- CN
- China
- Prior art keywords
- percent
- pipe
- 110ksi
- production casing
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 100
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 37
- 238000011282 treatment Methods 0.000 claims description 35
- 238000007670 refining Methods 0.000 claims description 33
- 238000010791 quenching Methods 0.000 claims description 28
- 230000000171 quenching effect Effects 0.000 claims description 28
- 238000005496 tempering Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000003303 reheating Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 238000003723 Smelting Methods 0.000 claims description 12
- 238000009849 vacuum degassing Methods 0.000 claims description 12
- 208000004434 Calcinosis Diseases 0.000 claims description 9
- 230000002308 calcification Effects 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000009847 ladle furnace Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 229910004709 CaSi Inorganic materials 0.000 claims description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 4
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 4
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 4
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 4
- 229910000805 Pig iron Inorganic materials 0.000 claims description 4
- 229910004534 SiMn Inorganic materials 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 4
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 16
- 229910052758 niobium Inorganic materials 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 23
- 238000011084 recovery Methods 0.000 description 20
- 238000007689 inspection Methods 0.000 description 11
- 238000005096 rolling process Methods 0.000 description 9
- 238000004321 preservation Methods 0.000 description 7
- 238000005422 blasting Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 229910000510 noble metal Inorganic materials 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000001247 metal acetylides Chemical group 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a 110KSI thermal production casing pipe and a manufacturing method thereof, wherein the casing pipe comprises the following components in percentage by weight: 0.23 to 0.28 percent of C, 0.15 to 0.34 percent of Si, 0.40 to 0.60 percent of Mn, 0.90 to 1.20 percent of Cr, 0.30 to 0.60 percent of Mo, 0.01 to 0.05 percent of V, 0.01 to 0.05 percent of Nb, 0.01 to 0.05 percent of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of the following impurity elements is controlled within the following content range: less than or equal to 0.010 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H and less than or equal to 0.002 percent of O. The invention adopts the Cr-Mo based low alloy and Nb + V + Ti micro alloy component design, and matches with the advanced heat treatment technology, and the conventional mechanical property and the use strength of the developed 110KSI steel grade thermal production casing pipe at 350 ℃ both meet the design requirements.
Description
Technical Field
The invention belongs to the technical field of thermal production casings, and particularly relates to a 110KSI thermal production casing and a manufacturing method thereof.
Background
When the steam injection of the heavy oil well is used for exploitation, hot steam with the temperature of 300-350 ℃ needs to be injected into the well, at the moment, the casing cannot be heated to expand due to the constraint, so that the casing is subjected to a larger compressive stress effect, and in the process of stopping the injection and the exploitation, the casing is subjected to a larger tensile stress effect due to the relaxation and creep effects of the metal material. As such, the casing is periodically subjected to such high tension-compression stresses that the casing fractures (or the threaded connection slips), deforming, which is a major cause of damage to the thermal production well casing. In addition, under the working condition environment of a heavy oil thermal recovery well, the mechanical property of the common steel sleeve can be seriously reduced along with the temperature rise of injected hot steam, and the use requirement under the high-temperature environment can not be met. In order to ensure the strength of the thermal production casing pipe when used in a high-temperature environment, noble metals such as Nb, V, Ti, W and the like are required to be added during the component design of the thermal production casing pipe, the production cost is high, and the 110KSI thermal production casing pipe accepted in the industry at present is mainly produced by low alloy steel containing Cr-Mo-W series and microalloying, wherein the noble metals such as W and the like are used, and the production cost is high.
Chinese patent CN110760754A discloses a 110KSI heat-resistant petroleum casing pipe and a manufacturing method thereof, wherein the chemical components comprise the following components in percentage by mass: 0.24 to 0.28 percent of C, 0.15 to 0.35 percent of Si, 0.80 to 1.00 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.0020 percent of S, 0.80 to 1.50 percent of Cr, less than or equal to 0.08 percent of Ni, less than or equal to 0.20 percent of Cu, 0.270 to 0.340 percent of Mo and the balance of Fe and impurity elements. The 110KSI seamless petroleum casing pipe disclosed by the patent has low high-temperature mechanical property reduction rate at 300 ℃, and the high-temperature yield strength meets the requirement of API5CT standard on 110 KSI. It can be seen that although the patent does not use noble metals, the production cost is reduced, the petroleum casing manufactured by the patent is subjected to high-temperature mechanical property test at 300 ℃, and even if the high-temperature yield strength at 300 ℃ meets the requirement, the use requirement of the working condition environment of 350 ℃ at most cannot be met.
Disclosure of Invention
The invention provides a 110KSI thermal production casing pipe and a manufacturing method thereof aiming at the technical problem that the thermal production casing pipe which is designed and manufactured by components without containing precious metals in the prior art can not meet the actual working condition requirement of more than 300 ℃ (such as 350 ℃), wherein the conventional mechanical property and the use strength of the developed 110KSI steel grade thermal production casing pipe under the condition of 350 ℃ both meet the design requirement by adopting Cr-Mo-based low alloy and Nb + V + Ti micro alloy component design and matching with an advanced heat treatment technology.
In order to achieve the above purpose, the invention provides the following technical scheme:
a110 KSI thermal production casing comprises the following components in percentage by weight: 0.23 to 0.28 percent of C, 0.15 to 0.34 percent of Si, 0.40 to 0.60 percent of Mn, 0.90 to 1.20 percent of Cr, 0.30 to 0.60 percent of Mo, 0.01 to 0.05 percent of V, 0.01 to 0.05 percent of Nb0.01 to 0.05 percent of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of the following impurity elements is controlled in the following content range: less than or equal to 0.010 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H and less than or equal to 0.002 percent of O.
The 110KSI thermal production casing pipe is as described above, and preferably, the grain size of the 110KSI thermal production casing pipe is 8.0-9.0 grade; at room temperature, the yield strength is 800-870MPa, the tensile strength is 880-950MPa, and the impact toughness is 126-130J; at 350 ℃, the yield strength is 730-800MPa, and the tensile strength is 830-900 MPa.
The manufacturing method of the 110KSI thermal production casing pipe takes the pipe blank with the components as raw materials, and comprises the following steps: adopting a CPE pipe jacking method to manufacture the pipe blank into a pipe with required specification, and a quenching and tempering treatment step of the pipe.
The manufacturing method of the 110KSI hot production casing pipe is as above, preferably, the processing method of the pipe blank is as follows: smelting scrap steel and pig iron serving as raw materials to obtain molten steel, carrying out external refining on the molten steel, adding SiMn alloy, low-carbon ferrochrome, ferrovanadium, ferrotitanium, ferromolybdenum and ferroniobium according to the designed weight ratio of the components of the thermal production casing in the external refining process to obtain the component ratio of the 110KSI thermal production casing, and carrying out vacuum degassing and continuous casting on the alloy liquid obtained after the external refining to obtain the pipe blank.
In the method for manufacturing the 110KSI hot production casing pipe, preferably, the electric furnace or the converter is adopted for smelting, and the C content in the discharged molten steel after the smelting is less than or equal to 0.10 percent and the P content in the discharged molten steel is less than or equal to 0.010 percent in percentage by weight;
preferably, the external refining adopts ladle furnace refining, argon is blown for stirring, the argon flow is 20-100NL/min, the stirring time is 20-45min, CaSi wires are fed for calcification treatment after the external refining, and the mass percentage of Ca in molten steel obtained after the calcification treatment is 0.0001-0.005%.
Preferably, the vacuum degassing is performed in a vacuum furnace, and the degree of vacuum in the vacuum furnace is less than 0.5 Torr.
In the above method for manufacturing the 110KSI thermal production casing, preferably, in the tube forming step, the tube blank is sequentially subjected to heating, piercing, pipe jacking, rod loosening, reheating and micro-tension diameter reduction treatment;
the heating is carried out for 2-10 hours at the temperature of 1150-1290 ℃;
the outer diameter of the perforated capillary is 140-300 mm, and the wall thickness of the capillary is 10-42 mm;
the open top temperature of the jacking pipe is 950-;
the reheating is carried out for 15-30min at the temperature of 850-; preferably, the reheating is performed by using a step-type heating furnace;
the reducing rate of the micro-tension reducing treatment is 0-15%.
In the method for manufacturing the 110KSI thermal production casing pipe, preferably, the temperature of the pipe blank before the perforation is 1150-1290 ℃, and the temperature after the perforation is 1100-1200 ℃; preferably, the perforation is performed by a conical perforating machine, and the feeding angle during perforation is 5-15 degrees.
In the method for manufacturing the 110KSI thermal production casing pipe, preferably, when the pipe jacking is performed, the mandrel is first subjected to a preheating treatment to raise the temperature of the mandrel to 300-650 ℃.
In the method for manufacturing the 110KSI thermal production casing pipe, preferably, in the thermal refining step, the pipe material obtained in the pipe forming step is subjected to the thermal refining as follows: firstly heating to 800-minus-one temperature of 950 ℃ and preserving heat for 1-3 hours, then quenching by adopting an external spraying and internal spraying quenching mode, wherein the pressure of an internal spraying quenching medium is 0.3-1.0MPa, and then tempering, wherein the tempering temperature is 500-minus-one temperature of 700 ℃ and preserving heat for 2-8 hours.
In the method for manufacturing the 110KSI thermal production casing pipe, preferably, the external spraying flow rate of the quenching medium is 1200-3800m during the quenching treatment3The external spraying pressure is 0.1-1.0MPa, the external spraying time is 5-100 seconds, and the internal spraying flow is 50-2000m3And h, the internal spraying time is 5-100 seconds.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1. in order to ensure the requirement of strength stability of the thermal recovery casing pipe in a high-temperature environment of 350 ℃, the thermal recovery casing pipe material needs to have the characteristics of low expansion coefficient, high melting point and the like, the invention adopts the component design of Cr-Mo-based low alloy, the content of C of 0.23-0.28% can ensure that a high-strength and high-toughness tempered sorbite structure can be obtained at a higher tempering temperature, if the content of C is too high, the toughness of the steel can be reduced along with the precipitation of a large amount of secondary carbides, certain Cr and Mo elements can be added to remarkably improve the high-temperature strength performance of the steel, and Mo can be subjected to dispersion strengthening in the form of fine carbides, so that the creep strength of the steel is improved, and the Nb + V + Ti microalloy can be added to refine austenite grains and improve the heat strength of the. In addition to the above main elements, it is necessary to reduce the content of harmful elements such as P, S in the steel as much as possible so as not to affect the strength of the bushing.
2. The invention controls the perforation process, ensures the uniformity of wall thickness, ensures the compactness of steel pipe materials by using large deformation amount by using the characteristic of large elongation of CPE longitudinal rolling during pipe jacking, simultaneously carries out preheating treatment on the core rod, reduces the temperature difference between the core rod and the steel pipe, and ensures that the manufactured pipe has high dimensional precision, good quality of inner and outer surfaces and no rolling defects and inner screw.
3. During the quenching and tempering treatment, the invention adopts an external spraying and internal spraying type quenching mode to ensure the pressure of the internal spraying flow, so that the performance uniformity of the whole section of the material is high, the hardness fluctuation of the whole section is less than or equal to 2HRC, and simultaneously, the low residual stress of the steel pipe in the using process is ensured by utilizing the steel pipe self-rotation straightening technology.
In conclusion, the invention adopts Cr-Mo-based low alloy and Nb + V + Ti microalloy component design and is matched with an advanced heat treatment technology, and the indexes of the developed 110KSI steel grade thermal production casing pipe, such as the conventional mechanical property, creep deformation, internal pressure blasting limiting resistance and the like, completely meet the requirements of the petroleum and gas industry standard SY/T6952.2-2013, can meet the use strength under the condition of 350 ℃, and has wide market prospect.
Drawings
FIG. 1 is a microstructure view of a thermal production casing manufactured in example 1;
FIG. 2 is a graph of creep versus time for various tensile stresses (20 h at 350 ℃) for thermal production casing manufactured in example 1: (a)600MPa, (b)620MPa, (c)640MPa, (d)680MPa, and (e)700 MPa.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In order to meet the use requirement of 350 ℃, the invention reduces the use of noble metals such as W and the like by redesigning the components and adopting the Cr-Mo based low alloy component design, in particular adopting the low alloy steel of 0.23-0.28 percent of C, 0.90-1.20 percent of Cr and 0.30-0.60 percent of Mo, thereby the developed 110KSI steel grade thermal production casing has low production cost and strong economic applicability. Further, in order to ensure the requirement of the thermal production casing on the strength stability performance in a high-temperature environment of 350 ℃, the casing material needs to have the characteristics of low expansion coefficient, high melting point and the like, and therefore, the embodiment of the invention provides a 110KSI thermal production casing which comprises the following components in percentage by weight: 0.23 to 0.28 percent of C, 0.15 to 0.34 percent of Si, 0.40 to 0.60 percent of Mn, 0.90 to 1.20 percent of Cr, 0.30 to 0.60 percent of Mo, 0.01 to 0.05 percent of V, 0.01 to 0.05 percent of Nb, 0.01 to 0.05 percent of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of the following impurity elements is controlled within the following content range: less than or equal to 0.010 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H and less than or equal to 0.002 percent of O.
On one hand, the thermal production casing pipe provided by the invention adopts the component design of Cr-Mo-based low alloy, thereby reducing the use of W which is a noble metal and lowering the production cost; on the other hand, the high-temperature strength performance of the steel can be obviously improved by adding a certain amount of Cr and Mo elements, and the Mo can generate dispersion strengthening in the form of fine carbide, so that the creep strength of the steel is improved; in addition, the Nb + V + Ti microalloy element is added, and the microalloy can refine austenite grains and improve the heat strength of the material. In addition to the above main elements, it is necessary to reduce the content of harmful elements such as P, S in steel as much as possible.
With the rise of the temperature of the use environment, the creep rate of the thermal recovery casing material can be accelerated under the action of external force, and the creep rate can meet the design requirements under different stress conditions in the temperature environment of 350 ℃ by adding the microalloy. Among the microalloy elements Nb + V + Ti, Nb, V and Ti are all elements forming high-strength carbide and nitride, and the functions of the three are different due to different precipitation temperatures. Ti is mainly precipitated in the reheating temperature range of steel, can inhibit austenite grains from growing in the austenitizing stage, and has the solid solution strengthening effect superior to that of V but inferior to that of Nb; nb exists in steel by replacing solute atoms, generates strong dragging action on dislocation slippage, and inhibits recrystallization nucleation, so that the Nb has strong inhibiting action on recrystallization, the action of Nb is higher than that of Ti and V, and Nb compounds can effectively inhibit recrystallization, accumulate strain and maintain the deformation structure of austenite grains, and in the phase transformation process, the precipitation phase of Nb can improve the nucleation rate of ferrite, and plays an important role in refining grains and improving performance, so that the addition of Nb is favorable for improving the room-temperature and high-temperature mechanical properties of the steel, and meanwhile, the addition of trace amount of Nb also has a good effect on high-temperature creep strength. The V element can form highly dispersed carbide and nitride particles in the steel, and the particles grow slowly by polymerization at a higher temperature, so that the heat strength and the creep resistance of the steel can be improved, and simultaneously the V element can improve the tempering stability of the steel and refine grains. Therefore, the invention adopts a mode of compositely adding three microalloy elements of Nb, V and Ti, and can achieve better effect under the condition of little cost increase. The inventor finds out through experiments that the mechanical property of the steel pipe at 350 ℃ is seriously slipped under the condition of not adding Nb and V, particularly the tensile strength and the yield strength. The strength reduction ratio of the steel material relative to the room temperature condition can be controlled to be about 6%, which has great value for the actual operation requirement of the thermal production casing. The cost of adding three microalloy elements of Nb, V and Ti is increased by 44 yuan/ton, and is reduced by 271 yuan/ton compared with the cost of adding 0.15 percent of W noble alloy, so that the invention can improve the heat strength of the material on the basis of not greatly increasing the cost by adding the microalloy elements, thereby keeping the strength stable in a high-temperature environment of 350 ℃.
In order to ensure the mechanical property of the 110KSI thermal production casing pipe with the composition when used at high temperature, the embodiment of the invention combines the advanced heat treatment technology to provide the following manufacturing method, which comprises the following steps:
the method comprises the following steps: tube blank: smelting waste steel and pig iron serving as raw materials to obtain molten steel, carrying out external refining on the obtained molten steel, adding SiMn alloy, low-carbon ferrochrome, ferrovanadium, ferrotitanium, ferromolybdenum and ferroniobium according to the designed weight ratio of the components of the thermal production casing in the external refining process to obtain the component ratio of the 110KSI thermal production casing, and carrying out vacuum degassing and continuous casting on the obtained alloy liquid after the external refining to obtain a pipe blank;
step two: tube forming: adopting a CPE pipe jacking method to form a pipe, and sequentially heating, perforating, pipe jacking, rod loosening, reheating and micro-tension diameter reducing the pipe blank in the pipe forming process;
the heating is carried out at 1150-1290 deg.C (e.g., 1160, 1170, 1180, 1195, 1200, 1220, 1230, 1240, 1260, 1280 deg.C) for 2-10 hours (e.g., 3, 4, 5, 6, 7, 7.5, 8, 9 hours);
the outer diameter of the perforated capillary is 140-300 mm (for example, 150, 170, 180, 200, 220, 250, 260, 280, 295mm), and the wall thickness of the capillary is 10-42mm (for example, 12, 15, 20, 25, 28, 30, 35, 38, 40 mm);
the open top temperature of the jacking pipe is 950-;
the reheating is carried out at 850-;
the reduction rate of the micro-tension reducing treatment is 0-15% (e.g. 1%, 4%, 7%, 10%, 12%, 14%);
step three: quenching and tempering: carrying out thermal refining treatment on the pipe as follows: heating the pipe obtained after pipe forming to 800-; the invention controls the internal spray pressure within the range of 0.3-1.0MPa (0.4, 0.5, 0.6, 0.7, 0.8, 0.9MPa), which is helpful for ensuring the cooling uniformity and cooling strength of the inner and outer surfaces of the steel pipe during quenching, thereby ensuring the uniformity of the whole section performance and preventing quenching cracking.
In the second step, in the pipe forming process of the CPE pipe jacking machine set, the characteristic of large elongation of longitudinal rolling of CPE is utilized, the compactness of the steel pipe material is ensured by adopting large deformation, the outer diameter size of the steel pipe can meet the requirements of 0 to +1 percent D (namely the error of the outer diameter size of the obtained steel pipe relative to the design requirement is 0 to 1 percent), the wall thickness size can meet the requirements of +/-8 percent t (namely the error of the wall thickness size of the obtained steel pipe relative to the design requirement is-8 to +8 percent), the quality of the inner surface and the outer surface is good, and the CPE pipe jacking machine set has no rolling defects and inner screw.
In the third step, an external spraying and internal spraying quenching mode is adopted to ensure the pressure of the internal jet flow, so that the performance of the whole section of the material is uniform, the hardness fluctuation of the whole section is less than or equal to 2HRC, and meanwhile, a steel pipe self-rotating straightening technology (namely, the steel pipe is placed on a cooling bed and is always kept in a rotating state through the transmission force of a reverse chain and the self gravity) is utilized to ensure the low residual stress of the steel pipe in the using process.
In the first step of the invention, an electric furnace or a converter is used for smelting, and in percentage by weight, the content of C in the discharged molten steel after the smelting is finished is less than or equal to 0.10% and the content of P is less than or equal to 0.010% (in the subsequent refining and vacuum degassing processes, the content of C, P element is only increased and is not reduced, so the content of the two elements is required to be controlled at a lower level in the smelting stage).
In the specific embodiment of the invention, in the first step, ladle furnace refining is adopted for external refining, argon is blown for stirring, the argon flow is 20-100NL and min, the stirring time is 20-45min, and CaSi wires are fed for calcification treatment after the external refining of the ladle furnace, wherein the calcification treatment is to wrap MnS by using a reaction product CaS to spheroidize inclusions, so that stress concentration caused by the inclusions is avoided, and the mass percentage content of Ca in molten steel obtained after the calcification treatment is 0.0001-0.005%.
In a specific embodiment of the present invention, in the first step, the vacuum degassing is performed in a vacuum furnace, and a degree of vacuum in the vacuum furnace is less than 0.5 Torr.
In the second step, the temperature of the tube blank before the perforation is 1150-1290 ℃, and the temperature after the perforation is 1100-1200 ℃.
In the second step of the present invention, a conical piercing machine is used for piercing, the feeding angle for piercing is 5-15 ° (e.g. 6, 8, 10, 12, 14 °), the plug diameter is 90-230mm (e.g. 100, 120, 150, 200, 210mm), the roll gap is 260mm (e.g. 150, 180, 200, 220, 240mm), the guide distance is 280mm (e.g. 150, 160, 180, 200, 210, 250, 260mm), and the pre-top pressing amount is less than or equal to 10%. Preferably, a small band-type brake is added to the background of the conical puncher (the band-type brake is usually arranged on the background of the puncher, but a certain distance and time are provided from the piercing of the tube blank to the contacting of the conventional band-type brake, so that the stability is poor in the period.
In the second step of the method, when the plug is pushed, the mandrel is first preheated to raise the temperature of the mandrel to 650 ℃ (e.g. 320, 350, 400, 420, 450, 500, 600, 620 ℃). The core rod is preheated, the temperature difference between the core rod and the pipe can be reduced, the steel pipe is high in size precision, the quality of the inner surface and the outer surface is good, and rolling defects and inner screw threads are avoided.
In a specific embodiment of the present invention, in the second step, the reheating is performed by using a step-type heating furnace.
In a specific embodiment of the present invention, in the third step, when the quenching treatment is performed, the external spraying flow rate of the quenching medium is 1200-3800m3H (e.g., 1400, 1600, 1800, 2000, 2500, 2600, 2900, 3100, 3400, 3500 m)3H), the external spraying pressure is 0.1-1.0MPa (0.2, 0.4, 0.6, 0.7, 0.8, 0.9MPa), the external spraying time is 5-100 seconds (10, 15, 20, 27, 32, 45, 58, 65, 70, 80, 95 seconds), the internal spraying flow is 50-2000m3/h(60、80、100、200、300、500、700、800、950、1020、1500、1800m3H), the internal spraying pressure is 0.3-1.0MPa (0.4, 0.5, 0.6, 0.7, 0.8, 0.9MPa), and the internal spraying time is 5-100 seconds (8, 10, 12, 15, 20, 25, 30, 40, 50, 60, 70, 85, 90, 95 seconds).
According to the component design and the manufacturing method, the grain size of the produced 110KSI thermal production casing pipe is 8.0-9.0 grade, the yield strength at room temperature is 800-870MPa, the tensile strength is 880-950MPa, the impact toughness is 126-130J, the yield strength at 350 ℃ is 730-800MPa, and the tensile strength is 830-900 MPa. The mechanical performance of the 110KSI thermal production casing pipe at 350 ℃ is obtained by testing according to GB and T4338 standards, the use requirements that the yield strength is more than or equal to 644MPa and the tensile strength is more than or equal to 733MPa can be completely met, meanwhile, the creep rate of the 110KSI thermal production casing pipe is smaller than the critical creep rate by testing according to the GB and T2039 standards and according to the creep fatigue test result; in addition, the 110KSI thermal recovery casing pipe is stretched to be invalid, and projects such as pipe body crushing, pipe body internal pressure blasting and the like are tested, so that the design requirements are met.
Example 1
The 110KSI thermal production casing pipe comprises the following chemical components in percentage by weight:
TABLE 1 chemical composition of 110KSI thermal production casing in example 1
The main process flow of the 110KSI thermal production casing pipe is as follows:
(1) tube blank: electric furnace, converter → external refining → vacuum degassing → continuous casting round billet → pipe blank inspection, the specific operation is as follows:
the method comprises the following steps of smelting by using waste steel and pig iron as raw materials in an 800KVA and t ultrahigh-power electric arc furnace, wherein C in discharged molten steel after smelting is less than or equal to 0.10% and P is less than or equal to 0.010%, and reducing inclusions and gases in the steel as much as possible by using a pure steel production process such as external refining, vacuum degassing and the like, wherein the external refining is ladle furnace refining, SiMn alloy, low-carbon ferrochrome, ferrovanadium, ferrotitanium, ferromolybdenum and ferroniobium are added according to the designed weight proportion of the components of the thermal production sleeve in the external refining process to obtain the component proportion of the 110KSI thermal production sleeve, the external refining is accompanied with argon blowing stirring, the argon flow is 80NL and min, the stirring time is 25min, a CaSi wire is fed after the ladle furnace refining for calcification treatment, and the mass percentage content of Ca in the molten steel obtained after the calcification treatment is 0.0001-0.005%; after the external refining is finished, carrying out vacuum degassing in a vacuum furnace, controlling the vacuum degree in the vacuum furnace to be less than 0.5Torr, and degassing for 20-40 min; obtaining purified molten steel after vacuum degassing, wherein the casting treatment of the purified molten steel adopts the whole-process protection of continuous casting, the superheat degree of the molten steel of a continuous casting tundish is less than or equal to 30 ℃, and the crystallizer is electromagnetically stirred to improve the segregation of materials, so that a pipe blank with the diameter of 230mm is obtained through the continuous casting process;
(2) tube forming: heating a pipe blank → perforating → pipe jacking → loosening rod → reheating → reducing diameter → cooling → sawing → straightening, which comprises the following steps:
uniformly heating the tube blank in a medium-diameter annular furnace at 1267 ℃ for 3 hours, then performing perforation treatment, wherein a conical perforator is adopted in the perforation treatment, a small band-type brake is additionally arranged at the background of the conical perforator to increase the stability, the feeding angle of the conical perforator is set to 9 degrees, the outer diameter of a perforated tubular billet is 237mm, the wall thickness of the tubular billet is 24mm, the diameter of a top is 180mm, the roller spacing is 198mm, the guide distance is 214mm, and the rolling reduction before the top is less than or equal to 7%; then, jacking the perforated capillary tube by using a tube jacking machine set of a CPE (customer premises equipment) unit, wherein the tube jacking is driven by three rollers and a large rack, the number of frames is 10, the opening temperature is 1160 ℃, a core rod used in tube jacking is preheated firstly, the temperature of the preheated core rod is 460 ℃, the outer diameter of the pierced tube obtained in tube jacking is 198mm, and the wall thickness of the pierced tube is 8.8 mm; after the pipe jacking is finished, loosening the rod, then reheating the pierced billet, wherein the reheating temperature is 920 ℃, the heat preservation is carried out for 28min under the temperature condition of 920 ℃, a 10-frame three-roller micro-tension reducing mill is adopted for carrying out micro-tension reducing treatment after the heat preservation is finished, the rolling speed of the reducing mill is 1.3m and s, the temperature of the pierced billet during the reducing process is 830 ℃, the reducing rate of the reducing mill is 13.4%, the outer diameter of the pipe obtained after the reducing process is 177.8mm, and the wall thickness is 9.19 mm; finally, the pipe obtained after reducing is sequentially cooled, sawed and straightened to obtain a pipe with the diameter of 177.8 multiplied by 9.19 mm;
(3) processing the sleeve: quenching and tempering → self-rotation straightening → inspection → nondestructive inspection → hydrostatic test → finishing quality inspection → length measurement weighing → packaging and warehousing, which comprises the following steps:
and (3) quenching and tempering the pipe straightened in the step (2): heating to 920 ℃, preserving heat for 1 hour, then quenching by adopting an external spraying and internal spraying type quenching mode, wherein the quenching medium is water, and the external spraying flow rate is 2400m when the quenching is carried out3H, external spraying pressure of 0.3MPa, external spraying time of 10 seconds and internal spraying flow of 250m3H, internal spraying time is 10 seconds, internal spraying pressure is 0.4MPa, total quenching time is within 5min, tempering treatment is carried out, the temperature of the tempering treatment is 660 ℃, heat preservation is carried out for 2 hours, hardening and tempering treatment is finished, self-rotation straightening is carried out, namely the pipe is always kept in a rotating state on a cooling bed placed obliquely through the transmission force of a reverse chain and the self gravity (the pipe does not need external force action and cannot generate residual stress through the self-rotation straightening mode), and then the steps of sequentially carrying out inspection and testing are carried outThe sleeve which meets the factory requirements is packaged and put in storage, and the thermal recovery sleeve with the diameter phi of 177.8 multiplied by the wall thickness of 9.19mm is obtained.
The microstructure of the thermal production casing manufactured in example 1 was measured, as shown in fig. 1 and table 4, by the grain size of grade 8, and mechanical properties at room temperature were measured according to the GB and T228.1 standards, and at 350 ℃.
Table 2 results of testing tensile properties of thermal production sleeve manufactured in example 1 at room temperature
Note: the impact toughness was a value converted to a test specimen having a size of 10X 7.5X 55 mm.
Table 3 tensile test results of thermal production casing pipe manufactured in example 1 at high temperature of 350 deg.c
Table 4 texture and grain size of thermal recovery casing produced in example 1
| Test specimen | Tissue of | Grain size |
| 1# | FIG. 1 shows a schematic view of a | Stage 8.0 |
Table 5 hardness test results of thermal production casing manufactured in example 1
Note: the near-surface hardness value represents the hardness value close to the outer surface of the pipe wall of the thermal recovery casing pipe; the wall thickness center hardness value represents the hardness value at the center of the wall of the thermal production casing; the near-inner surface hardness value represents the hardness value near the inner surface of the wall of the thermal production casing.
As can be seen from tables 2 and 3, the tensile property at room temperature and the tensile property at high temperature of 350 ℃ of the thermal production casing manufactured in the example 1 can meet the standard requirement of the 110KSI thermal production casing; in addition, as shown in table 5, the hardness test of the thermal recovery casing of example 1 was performed in accordance with the test standard GB and T230.1, and the fluctuation in the full section hardness was 0.2, and the uniformity in the full section hardness was high.
The present invention further performed a creep fatigue test on the thermal recovery casing manufactured in example 1, specifically, the test specimen was 5 × 25mm in diameter (the thermal recovery casing manufactured in example 1 was turned to obtain a specimen 5mm in diameter and 25mm in length) according to the test of GB and T2039, and the creep test was performed on an Instron-8862 type high precision electronic creep fatigue tester under the test conditions that the applied load was maintained at a high temperature of 350 ℃ for 20 hours and the applied tensile stresses were: 600MPa, 620MPa, 640MPa, 680MPa and 700 MPa. The creep rate constitutive curve is obtained after nonlinear fitting of the creep rate-load relationship of the sample under different tensile stresses, as shown in fig. 2, the creep rate constitutive curve of the sample is compared with the creep rate constitutive curve required by the SY and T6592.3-2013 industry standard, and the curves of the thermal recovery casing pipe (marked as 110SH-1 thermal recovery casing pipe) in the embodiment 1 are all positioned below the critical curve required by the standard, namely the creep rate of the thermal recovery casing pipe is smaller than the critical creep rate, so that the standard requirements are met. The creep constitutive equations are summarized in Table 6.
TABLE 6 creep constitutive equation of 110SH-1 thermal recovery casing pipe body at high temperature of 350 DEG C
In addition, the thermal recovery casing manufactured in the embodiment 1 is tested in terms of pipe body stretching failure, pipe body crushing failure, pipe body internal pressure blasting and the like, and design requirements are met. 177.8 x 9.19mm 110KSI steel grade hot production casing pipe manufactured in example 1 is subjected to pipe blank stretching failure detection on a 2500KN composite loading tester (the result is shown in the following table 7), the breaking load is 4292KN, and the standard requirement is met, namely, the breaking load is not less than 3695 KN; the anti-crushing performance is tested on a composite crushing tester (the result is shown in the following table 8), the crushing limit load is 47.7MPa, and the 42.9MPa requirement of the standard requirement is met; a pipe body internal pressure blasting test is carried out on a physical blasting system (the result is shown in the following table 9), the internal pressure resistant limit load is 103MPa, and the standard requirement is met and is more than or equal to 68.6 MPa.
TABLE 7 elongation to failure results of pipe body
TABLE 8 pipe collapse test results
TABLE 9 burst test results under internal pressure
Example 2
A110 KSI thermal production casing pipe has the same chemical composition as that of the casing pipe in the embodiment 1.
The main process flow of the 110KSI thermal production casing pipe is as follows:
(1) tube blank: the specific operation of the electric furnace, the converter → external refining → vacuum degassing → continuous casting round billet → pipe blank inspection is basically the same as that of the embodiment 1, and the difference is only that: controlling the diameter of the obtained tube blank to be 195mm in the continuous casting process;
(2) tube forming: heating a pipe blank → perforating → pipe jacking → loosening rod → reheating → reducing diameter → cooling → sawing → straightening, which comprises the following steps:
uniformly heating the tube blank in a medium-diameter annular furnace, wherein the heating temperature is 1258 ℃, the heat preservation time is 2.6 hours, then performing perforation treatment, wherein a conical perforator is adopted for the perforation treatment, a small band-type brake is added at the background of the conical perforator to increase the stability, the feeding angle of the conical perforator is set to be 9 degrees, the outer diameter of a perforated tubular billet is 199mm, the wall thickness of the tubular billet is 22.5mm, the diameter of a top head is 144mm, the roller spacing is 166mm, the guide distance is 183mm, and the rolling reduction before the top is less than or equal to 7 percent; then, jacking the perforated capillary tube by using a tube jacking machine set of a CPE (customer premises equipment) unit, wherein the tube jacking is transmitted by using three rollers and a large rack, the number of racks is 8, the opening temperature is 1142 ℃, a core rod used in tube jacking is preheated firstly, the temperature of the preheated core rod is 450 ℃, the outer diameter of the pierced tube obtained by tube jacking is 156mm, and the wall thickness of the pierced tube is 8.6 mm; after the pipe jacking is finished, loosening the rod, then reheating the pierced billet, wherein the reheating temperature is 918 ℃, and keeping the temperature at 918 ℃ for 26min, and after the heat preservation is finished, a 9-frame three-roller micro-tension reducing mill is adopted for carrying out micro-tension reducing treatment, the rolling speed of the reducing mill is 1.4m and s, the pierced billet temperature during reducing is 818 ℃, the reducing rate of the reducing mill is 14.1%, the outer diameter of the pipe obtained after reducing is 139.7mm, and the wall thickness is 9.17 mm; finally, the pipe obtained after reducing is sequentially cooled, sawed and straightened to obtain a pipe with the diameter of 139.7 multiplied by 9.17 mm;
(3) processing the sleeve: quenching and tempering → self-rotation straightening → inspection → nondestructive inspection → hydrostatic test → finishing quality inspection → length measurement weighing → packaging and warehousing, which comprises the following steps:
and (3) quenching and tempering the pipe straightened in the step (2): heating to 800-3The external spraying pressure is 0.2MPa, the external spraying time is 10 seconds, and the internal spraying flow is 200m3H, internal spraying time of 10 seconds, internal spraying pressure of 0.5MPa, totalQuenching time is within 5min, then tempering treatment is carried out, the temperature of the tempering treatment is 665 ℃, heat preservation is carried out for 2 hours, the thermal refining treatment is finished after the heat preservation is finished, then self-rotation straightening is carried out, then the sleeve conforming to the factory requirements is packaged and warehoused after inspection, nondestructive flaw detection, hydraulic pressure test, quality inspection, length measurement and weighing in sequence, and thus the thermal recovery sleeve with the diameter of 139.7 multiplied by 9.17mm is obtained.
The thermal production casing manufactured in example 2 was subjected to microstructure testing, the grain size was also class 8, mechanical properties at room temperature were tested according to the GB and T228.1 standards, and mechanical properties at 350 ℃ were tested according to the GB and T4338 standards, as shown in tables 10 and 11, respectively.
Table 10 results of testing tensile properties of thermal production sleeve manufactured in example 2 at room temperature
Note: the impact toughness was a value converted to a test specimen having a size of 10X 7.5X 55 mm.
Table 11 results of tensile test at 350 c for thermal production casing pipe manufactured in example 2
Table 12 hardness of thermal production casing produced in example 2
As can be seen from tables 10 and 11, the tensile properties at room temperature and the tensile properties at high temperature of 350 ℃ of the thermal recovery casing manufactured in example 2 can meet the standard requirements of the 110KSI thermal recovery casing, and table 12 shows that the thermal recovery casing of example 2 has a full section hardness fluctuation of 0.4 and a high full section hardness uniformity.
In conclusion, the invention adopts Cr-Mo-based low alloy and Nb + V + Ti microalloy component design and is matched with an advanced heat treatment technology, and the indexes of the conventional mechanical property, creep deformation, internal pressure blasting limiting resistance and the like of the developed 110KSI steel grade thermal production casing pipe completely meet the requirements of the oil and gas industry standards SY and T6952.2-2013, can meet the use strength under the condition of 350 ℃, and has wide market prospect.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. The 110KSI thermal production casing pipe is characterized by comprising the following components in percentage by weight: 0.23 to 0.28 percent of C, 0.15 to 0.34 percent of Si, 0.40 to 0.60 percent of Mn, 0.90 to 1.20 percent of Cr, 0.30 to 0.60 percent of Mo, 0.01 to 0.05 percent of V, 0.01 to 0.05 percent of Nb0.01 to 0.05 percent of Ti, and the balance of Fe and inevitable impurity elements, wherein the content of the following impurity elements is controlled in the following content range: less than or equal to 0.010 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H and less than or equal to 0.002 percent of O.
2. The 110KSI thermal production casing of claim 1, wherein the grain size of the 110KSI thermal production casing is between 8.0 and 9.0 grade; at room temperature, the yield strength is 800-870MPa, the tensile strength is 880-950MPa, and the impact toughness is 126-130J; at 350 ℃, the yield strength is 730-800MPa, and the tensile strength is 830-900 MPa.
3. A method of manufacturing a 110KSI thermal production casing according to claim 1 or 2, using as a starting material a pipe blank having the composition of claim 1, the method comprising: adopting a CPE pipe jacking method to manufacture the pipe blank into a pipe with required specification, and a quenching and tempering treatment step of the pipe.
4. The method of manufacturing a 110KSI thermal production casing according to claim 3, wherein said tube blank is formed by a method comprising: smelting scrap steel and pig iron serving as raw materials to obtain molten steel, carrying out external refining on the molten steel, adding SiMn alloy, low-carbon ferrochrome, ferrovanadium, ferrotitanium, ferromolybdenum and ferroniobium according to the designed weight ratio of the components of the thermal production casing in the external refining process to obtain the component ratio of the 110KSI thermal production casing, and carrying out vacuum degassing and continuous casting on the alloy liquid obtained after the external refining to obtain the pipe blank.
5. The method for manufacturing the 110KSI hot production casing pipe of claim 4, wherein the smelting adopts an electric furnace or a converter, and the weight percentage of C in the discharged molten steel after the smelting is finished is less than or equal to 0.10 percent and the weight percentage of P is less than or equal to 0.010 percent;
preferably, the external refining adopts ladle furnace refining, argon is blown for stirring, the argon flow is 20-100NL/min, the stirring time is 20-45min, CaSi wires are fed for calcification treatment after the external refining, and the mass percentage of Ca in molten steel obtained after the calcification treatment is 0.0001-0.005%.
Preferably, the vacuum degassing is performed in a vacuum furnace, and the degree of vacuum in the vacuum furnace is less than 0.5 Torr.
6. The method of manufacturing a 110KSI thermal production casing according to claim 3, wherein in said tube forming step, the tube blank is subjected to heating, piercing, pipe jacking, rod loosening, reheating, and micro-tension reducing treatments in sequence;
the heating is carried out for 2-10 hours at the temperature of 1150-1290 ℃;
the outer diameter of the perforated capillary is 140-300 mm, and the wall thickness of the capillary is 10-42 mm;
the open top temperature of the jacking pipe is 950-;
the reheating is carried out for 15-30min at the temperature of 850-; preferably, the reheating is performed by using a step-type heating furnace;
the reducing rate of the micro-tension reducing treatment is 0-15%.
7. The method of claim 6 wherein the temperature of the tubular blank before piercing is 1150-1290 ℃ and the temperature after piercing is 1100-1200 ℃; preferably, the perforation is performed by a conical perforating machine, and the feeding angle during perforation is 5-15 degrees.
8. The method of claim 5 wherein the jacking pipe is first preheated to raise the temperature of the mandrel to 300-650 ℃.
9. The method of manufacturing a 110KSI thermal production casing according to claim 3, wherein in said step of tempering, the pipe material obtained in said step of forming a pipe is subjected to the following steps of tempering: firstly heating to 800-minus-one temperature of 950 ℃ and preserving heat for 1-3 hours, then quenching by adopting an external spraying and internal spraying quenching mode, wherein the pressure of an internal spraying quenching medium is 0.3-1.0MPa, and then tempering, wherein the tempering temperature is 500-minus-one temperature of 700 ℃ and preserving heat for 2-8 hours.
10. The method of claim 9 wherein the quenching medium has an external flow rate of 1200-3800m3The external spraying pressure is 0.1-1.0MPa, the external spraying time is 5-100 seconds, and the internal spraying flow is 50-2000m3And h, the internal spraying time is 5-100 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010888224.6A CN111945073A (en) | 2020-08-28 | 2020-08-28 | 110KSI thermal production casing pipe and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010888224.6A CN111945073A (en) | 2020-08-28 | 2020-08-28 | 110KSI thermal production casing pipe and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111945073A true CN111945073A (en) | 2020-11-17 |
Family
ID=73366809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010888224.6A Pending CN111945073A (en) | 2020-08-28 | 2020-08-28 | 110KSI thermal production casing pipe and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111945073A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115161563A (en) * | 2022-06-15 | 2022-10-11 | 大冶特殊钢有限公司 | 95KSI super 13Cr casing pipe and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388825A (en) * | 2014-11-25 | 2015-03-04 | 江苏常宝钢管股份有限公司 | Preparation process of anti-CO2-corrosion oil well pipe with steel grade of less than 150ksi produced by CPE unit |
| WO2019168505A1 (en) * | 2018-02-27 | 2019-09-06 | Halliburton Energy Services, Inc. | Downhole check valve assembly with a swellable element mechanism |
| CN110760754A (en) * | 2019-10-31 | 2020-02-07 | 达力普石油专用管有限公司 | 110KSI heat-resistant petroleum casing pipe and manufacturing method thereof |
-
2020
- 2020-08-28 CN CN202010888224.6A patent/CN111945073A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388825A (en) * | 2014-11-25 | 2015-03-04 | 江苏常宝钢管股份有限公司 | Preparation process of anti-CO2-corrosion oil well pipe with steel grade of less than 150ksi produced by CPE unit |
| WO2019168505A1 (en) * | 2018-02-27 | 2019-09-06 | Halliburton Energy Services, Inc. | Downhole check valve assembly with a swellable element mechanism |
| CN110760754A (en) * | 2019-10-31 | 2020-02-07 | 达力普石油专用管有限公司 | 110KSI heat-resistant petroleum casing pipe and manufacturing method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 《冶金设备产品手册》编辑委员会 等: "《冶金设备产品手册》", 31 October 2014, 冶金工业出版社 * |
| 唐科 等: "稠油热采井用110SH-1钢级热采套管的开发", 《特殊钢》 * |
| 张才安: "《无缝钢管生产新技术》", 30 November 1986, 重庆大学出版社 * |
| 李群 等: "《钢管生产》", 31 August 2008, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115161563A (en) * | 2022-06-15 | 2022-10-11 | 大冶特殊钢有限公司 | 95KSI super 13Cr casing pipe and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5387799B1 (en) | Manufacturing method of high strength steel with excellent resistance to sulfide stress cracking | |
| EP2530172B1 (en) | Production method for seamless steel pipe used in line pipe, and seamless steel pipe used in line pipe | |
| RU2431693C1 (en) | Seamless pipe of martensite stainless steel for oil field pipe equipment and procedure for its manufacture | |
| CN109154053B (en) | Seamless steel pipe and method for producing same | |
| EP1813687B1 (en) | Method for producing martensitic stainless steel pipe | |
| WO2010113953A1 (en) | Method for producing seamless steel pipe | |
| JPH1150148A (en) | Production of high strength and high corrosion resistance seamless steel pipe | |
| CN109913757B (en) | Corrosion-resistant and high-extrusion-resistance petroleum casing pipe and preparation method thereof | |
| EP2468904B1 (en) | Method for manufacturing thick-walled seamless steel pipe | |
| MX2008016193A (en) | Low-alloy steel, seamless steel pipe for oil well, and process for producing seamless steel pipe. | |
| MXPA97008775A (en) | Process to produce steel pipe without seams of great strength having excellent resistance to the fissure by tensions by sulf | |
| CN108699644B (en) | Seamless steel pipe and method for producing same | |
| EP3112490A1 (en) | Steel pipe for fuel injection line, and fuel injection line employing same | |
| WO2017150252A1 (en) | Steel material and steel pipe for use in oil well | |
| JP2017031493A (en) | Manufacturing method of stainless steel pipe | |
| JPH10280037A (en) | Production of high strength and high corrosion-resistant seamless seamless steel pipe | |
| CN101413088A (en) | Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof | |
| JP2020500262A (en) | Medium manganese steel for low temperature and its manufacturing method | |
| WO2021218932A1 (en) | High strength, high-temperature corrosion resistant martensitic stainless steel and manufacturing method therefor | |
| JP6805639B2 (en) | Manufacturing method of stainless steel pipe | |
| WO2017150251A1 (en) | Steel material and steel pipe for use in oil well | |
| CN111945073A (en) | 110KSI thermal production casing pipe and manufacturing method thereof | |
| WO2021078255A1 (en) | Anti-collapse petroleum casing pipe and manufacturing method therefor | |
| JP7458685B2 (en) | High strength anti-collapse oil casing and its manufacturing method | |
| AU2019251876A1 (en) | Steel pipe and method for producing steel pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201117 |
|
| RJ01 | Rejection of invention patent application after publication |