CN116607068A - 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and hot continuous rolling process manufacturing method - Google Patents
125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and hot continuous rolling process manufacturing method Download PDFInfo
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- 239000003129 oil well Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 title claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 9
- 238000000137 annealing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 6
- 238000001125 extrusion Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000010949 copper Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- 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
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
The application relates to a 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and a hot continuous rolling process manufacturing method, belonging to the technical field of metallurgy. The SUP13Cr oil well pipe comprises the following chemical components in percentage by mass: c: less than or equal to 0.03 percent, si:0.15 to 0.40 percent of Mn:0.30 to 0.50 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.003 percent, cr:11.5 to 13.5 percent, mo:1.90 to 2.10 percent of Ni:4.80 to 6.00 percent of Cu: less than or equal to 0.20 percent, V:0.07 to 0.11 percent of Ti: less than or equal to 0.02 percent, nb:0.01 to 0.03 percent of Al:0.010% -0.050%, N:0.03 to 0.06 percent, and the balance of Fe and unavoidable impurities. The SUP13Cr oil well pipe has excellent CO2 and CI-corrosion resistance on the premise of meeting the requirements of high strength and toughness and high extrusion resistance, and is used for the exploration and development of shale gas wells; the adopted manufacturing method has high yield and high efficiency.
Description
Technical Field
The application relates to a 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and a hot continuous rolling process manufacturing method, belonging to the technical field of metallurgy.
Background
Shale gas belongs to the clean energy category, and scale exploration and development are being carried out in the Chongqing area of China. The vertical depth of shale gas wells in China is generally 2000-4500 m, and the horizontal section is 2000-3000 m. In order to improve the shale gas yield, multistage perforation and large-scale volume fracturing construction are required to be carried out on the production sleeve in a well completion stage, and the shale gas sleeve is required to have high strength and toughness and high collapse resistance to resist perforation impact and extrusion of stratum fracture and dislocation to the pipe body in the volume fracturing stage.
In recent years, with the expansion of shale gas block development range, partial well formations contain high concentrations of CO 2 、CI - And etching the medium. Conventional carbon steel shale gas casings have failed to meet the corrosion resistance requirements of exploration and development and long-term service. When the strength of the common 13Cr material is increased to 110Ksi, the toughness is seriously reduced, the impact power value is less than 10J, and the requirements of high collapse resistance and high toughness in the service working condition of the shale gas well cannot be met. It is necessary to develop a 13Cr oil sleeve product with the strength grade of 125Ksi and toughness equivalent to carbon steel, and the 13Cr oil sleeve product has excellent CO2 and CI-corrosion resistance on the premise of meeting the requirements of high strength and toughness and high extrusion resistance.
The production of 125Ksi super 13Cr seamless steel pipes by adopting a hot extrusion process is realized in China, but the manufacturing process has low yield and low efficiency, and is not suitable for the requirement of mass production of oil casing pipe products.
Disclosure of Invention
The technical problem to be solved by the application is to provide a 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and a hot continuous rolling process manufacturing method aiming at the prior art, wherein the SUP13Cr oil well pipe has excellent CO resistance on the premise of meeting the requirements of high strength and high collapse resistance 2 、CI - The corrosion capacity is used for the exploration and development of shale gas wells; the adopted manufacturing method has high yield and high efficiency.
The application solves the problems by adopting the following technical scheme: the shale gas is a 125Ksi high-strength and high-toughness SUP13Cr oil well pipe, and the SUP13Cr oil well pipe comprises the following chemical components in percentage by mass: c: less than or equal to 0.03 percent, si:0.15 to 0.40 percent of Mn:0.30 to 0.50 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.003 percent, cr:11.5% to
13.5%, mo:1.90 to 2.10 percent of Ni:4.80 to 6.00 percent of Cu: less than or equal to 0.20 percent, V:0.07 to 0.11 percent of Ti: less than or equal to 0.02 percent, nb:0.01 to 0.03 percent of Al:0.010% -0.050%, N:0.03 to 0.06 percent, and the balance of Fe and unavoidable impurities.
The yield strength Rp0.2 of the SUP13Cr oil well pipe is 900-1069 MPa, the collapse resistance strength is more than or equal to 160MPa, and the longitudinal full-size impact energy of a Charpy V-shaped notch at-10 ℃ is more than or equal to 160J.
A method for manufacturing a 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas by a hot rolling process, the manufacturing method comprising the following steps:
step one: preparing a blank;
step two: cogging and annealing the blank;
step three: blank processing: carrying out surface peeling and tail centering on the blank to obtain a round blank;
step four: heating the round blank: feeding the round billet into an annular furnace for sectional heating;
step five: perforating: perforating the heated round billet to form a capillary;
step six: tandem rolling: rolling the hollow billet by the continuous rolling unit to form a pierced billet;
step seven: sizing: reducing the diameter of the pierced billet by tension to form a rolled pipe; then checking the rolled tube;
step eight: and (5) evaluating a heat treatment process: performing heat treatment process assessment on the rolled tube, and formulating a heat treatment process;
step nine: normalizing: normalizing the rolled tube; cooling by fog cooling after discharging;
step ten: tempering: tempering the normalized rolled tube to obtain a tempered martensitic structure;
step eleven: thermally straightening;
step twelve: detecting performance;
step thirteen: nondestructive flaw detection;
step fourteen: and (5) threading the pipe ends.
The rolling ratio in the second step is more than or equal to 3.0, the annealing temperature is more than or equal to 760 ℃, and the heat preservation time is more than or equal to 8 hours.
In the fourth step, a low-temperature slow-speed high-temperature rapid heating principle is adopted, and the temperature of a soaking section is controlled at 1210-1230 ℃.
And step six, preheating the core rod in advance, wherein the preheating temperature is more than or equal to 90 ℃.
In the seventh step, the diameter of the pierced billet is reduced by matching the dephosphorization nozzle with the water retaining ring, and the dephosphorization pressure of the high-pressure water is more than or equal to 18MPa.
In the step nine, the rolled tube is heated to 960+/-10 ℃.
And heating the tempering furnace to 600-620 ℃ for 60min, wherein the delta ferrite content is less than or equal to 5%.
In the eleventh step, the straightening finishing temperature is more than or equal to 480 ℃.
Compared with the prior art, the application has the advantages that: the high strength and toughness SUP13Cr oil well pipe for shale gas has yield strength of SUP13Cr oil well pipe (Rp 0.2) of 900-1069 MPa, tensile strength of not less than 931MPa, charpy V-shaped notch longitudinal full-size impact energy of not less than 160J at minus 10 ℃, pipe body collapse resistance of not less than 160MPa and excellent CO2 and Cl-corrosion resistance. For the 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas, a hot continuous rolling manufacturing process is initiated, the yield is improved, the cost is reduced, and the production efficiency is improved.
Detailed Description
The present application is described in further detail below with reference to examples.
The production method of the 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and the hot continuous rolling process in the embodiment is characterized in that SUP13Cr oil well pipes with the specification of phi 139.70mm multiplied by 12.70mm are produced, blanks with the same furnace number are used in the embodiment of the A-G heat treatment process, the chemical compositions of the blanks are consistent, and the chemical compositions are shown in the table 1:
table 1 (mass percent)
Step 1: preparing a blank: adopting an electric furnace, external refining, vacuum degassing and continuous casting to obtain square billets.
Step 2: cogging and annealing: cogging the square billet, wherein the rolling ratio is more than or equal to 3.0, so as to improve the core quality of the casting blank and reduce the defects of the inner surface after rolling; then annealing treatment is carried out, the annealing temperature is more than or equal to 760 ℃, the heat preservation time is more than or equal to 8 hours, and the annealing treatment is carried out along with furnace cooling to prevent cracking.
Step 3: blank processing: and (3) carrying out surface peeling and tail centering on the blank obtained in the step (2) to obtain a round blank. The diameter of the centering hole is 80mm, the punching depth is 80mm, and the punching quality is improved.
Step 4: heating in a ring furnace: and feeding the round billet into an annular furnace for sectional heating. The low-temperature slow-speed and high-temperature rapid heating principle is adopted, the temperature of a soaking section is controlled at 1210-1230 ℃, the harmful phase precipitation is avoided when the temperature is too high, the deformation resistance is large when the temperature is too low, the rolling load is increased, and the surface defects are easy to form.
Step 5: perforating: and the conical perforating machine is used for perforating the heated round billet, 9 ejector rods are adopted for circulating rolling, the sufficient cooling of the ejector heads is ensured, the final rolling temperature is 1180-1220 ℃, and a capillary tube is formed.
Step 6: tandem rolling: and rolling the hollow billet by the PQF three-roller continuous rolling unit to form a pierced billet. Preheating the core rod to more than 90 ℃ in advance; the graphite lubrication speed is 0.8m/s, the lubrication pressure is more than or equal to 45bar, and the quality of the inner surface is ensured.
Step 7: sizing: the pierced billet is subjected to tension reducing, an inner hole of a frame with the outer diameter being 0.1-0.2 mm larger than that of common carbon steel with the same specification is selected, a dephosphorization nozzle and a water retaining ring are used, the dephosphorization pressure of high-pressure water is more than or equal to 18MPa, and the head is staggered for 100mm. The rolling ratio of the blank to the rolled pipe after sizing is more than or equal to 4.0, and the steel pipe is manually inspected after sizing, so that the size, straightness and surface quality of the steel pipe are ensured to meet the product specification.
Step 8: and (5) evaluating a heat treatment process: and (3) performing heat treatment process evaluation on the rolled pipe prepared in the step (7), and further formulating a high-strength and toughness SUP13Cr heat treatment process, wherein the heat treatment process is shown in Table 2.
TABLE 2
Sampling detection is carried out on the sample tubes of different heat treatment processes, and the yield strength, the tensile strength, the hardness, the impact energy and the like are tested, and the performance detection result data are shown in Table 3.
TABLE 3 Table 3
Step 9: normalizing: and (5) determining the heat treatment process of the batch production according to the heat treatment process evaluation data in the step 8. Normalizing the rolled tube obtained in the step 7, heating the rolled tube to 960 ℃ by a stepping high-temperature furnace, keeping the temperature change within 10 ℃ by a computer temperature control technology, keeping the temperature for 30 minutes, ensuring the component dispersion by the high-temperature heat preservation, reducing the component segregation of the finished product, and refining grains, wherein quantitative Cr, ni and Mo alloys are contained in the SUP13Cr steel grade in the design process. And after the furnace is discharged, water quenching is replaced by fog cooling, the cooling speed is controlled to reduce the room temperature, and the cracking of the pipe body is prevented.
Step 10: tempering: tempering the pipe body obtained in the step 9, heating to 600-620 ℃ by a tempering furnace, and keeping the temperature for 60 minutes to obtain a tempered martensite structure, wherein the delta ferrite content is less than or equal to 5%, and the toughness is ensured.
Step 11: and (3) hot straightening: and (3) carrying out hot rotary straightening on the steel pipe obtained in the step (10), controlling the straightening finishing temperature to be more than or equal to 480 ℃, and controlling the residual stress level on the premise of ensuring the straightness.
Step 12: and (3) performance detection: and (3) sampling and detecting the steel pipe obtained in the step (11), and checking yield strength, tensile strength, hardness, impact energy, grain size, texture and inclusion to meet the target requirements.
Step 13: nondestructive flaw detection: and (3) carrying out ultrasonic nondestructive inspection on the steel pipes obtained in the step (11) one by one, and ensuring that the inner surface and the outer surface are defect-free.
Step 14: threading: and (3) performing pipe end threading on the steel pipe obtained in the step (11), performing external thread sand blasting on the steel pipe, and controlling the surface roughness Ra to be less than or equal to 3.2. Copper plating treatment (adopting copper-tin alloy) is carried out on the internal thread of the coupling, so that the thread anti-galling performance is improved.
The 125Ksi high strength and toughness SUP13Cr oil well pipe produced by the application has mechanical properties which completely meet the use requirements of oil fields, yield strength which meets the range requirement of (Rp 0.2) 900-1069 MPa, tensile strength which is more than or equal to 931MPa, and Charpy V-shaped notch longitudinal full-size impact energy which is far more than 160J at minus 10 ℃. The anti-collapse performance of the pipe body is more than 160MPa. The SUP13Cr oil well pipe has excellent CO resistance under the premise of meeting the requirements of high strength and toughness and high extrusion resistance 2 、CI - The corrosion capacity is used for the exploration and development of shale gas wells; the adopted manufacturing method has high yield and high efficiency.
In addition to the above embodiments, the present application also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present application.
Claims (10)
1. A125 Ksi high strength and toughness SUP13Cr oil well pipe for shale gas is characterized in that: the SUP13Cr oil well pipe comprises the following chemical components in percentage by mass: c: less than or equal to 0.03 percent, si:0.15 to 0.40 percent of Mn:0.30 to 0.50 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.003 percent, cr:11.5 to 13.5 percent, mo:1.90 to 2.10 percent of Ni:4.80 to 6.00 percent of Cu: less than or equal to 0.20 percent, V:0.07 to 0.11 percent of Ti: less than or equal to 0.02 percent, nb:0.01 to 0.03 percent of Al:0.010% -0.050%, N:0.03 to 0.06 percent, and the balance of Fe and unavoidable impurities.
2. The 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 1, wherein: the yield strength Rp0.2 of the SUP13Cr oil well pipe is 900-1069 MPa, the collapse resistance strength is more than or equal to 160MPa, and the longitudinal full-size impact energy of a Charpy V-shaped notch at-10 ℃ is more than or equal to 160J.
3. A method for manufacturing a 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas by hot rolling process based on any one of claims 1-2, characterized in that: the manufacturing method comprises the following steps:
step one: preparing a blank;
step two: cogging and annealing the blank;
step three: blank processing: carrying out surface peeling and tail centering on the blank to obtain a round blank;
step four: heating the round blank: feeding the round billet into an annular furnace for sectional heating;
step five: perforating: perforating the heated round billet to form a capillary;
step six: tandem rolling: rolling the hollow billet by the continuous rolling unit to form a pierced billet;
step seven: sizing: reducing the diameter of the pierced billet by tension to form a rolled pipe; then checking the rolled tube;
step eight: and (5) evaluating a heat treatment process: performing heat treatment process assessment on the rolled tube, and formulating a heat treatment process;
step nine: normalizing: normalizing the rolled tube; cooling by fog cooling after discharging;
step ten: tempering: tempering the normalized rolled tube to obtain a tempered martensitic structure;
step eleven: thermally straightening;
step twelve: detecting performance;
step thirteen: nondestructive flaw detection;
step fourteen: and (5) threading the pipe ends.
4. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: the rolling ratio in the second step is more than or equal to 3.0, the annealing temperature is more than or equal to 760 ℃, and the heat preservation time is more than or equal to 8 hours.
5. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: in the fourth step, a low-temperature slow-speed high-temperature rapid heating principle is adopted, and the temperature of a soaking section is controlled at 1210-1230 ℃.
6. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: and step six, preheating the core rod in advance, wherein the preheating temperature is more than or equal to 90 ℃.
7. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: in the seventh step, the diameter of the pierced billet is reduced by matching the dephosphorization nozzle with the water retaining ring, and the dephosphorization pressure of the high-pressure water is more than or equal to 18MPa.
8. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: in the step nine, the rolled tube is heated to 960+/-10 ℃.
9. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: and heating the tempering furnace to 600-620 ℃ for 60min, wherein the delta ferrite content is less than or equal to 5%.
10. The method for manufacturing the 125Ksi high strength and toughness SUP13Cr oil well pipe for shale gas according to claim 3, wherein the method comprises the following steps: in the eleventh step, the straightening finishing temperature is more than or equal to 480 ℃.
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| CN202310447336.1A CN116607068A (en) | 2023-04-24 | 2023-04-24 | 125Ksi high-strength and high-toughness SUP13Cr oil well pipe for shale gas and hot continuous rolling process manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118389040A (en) * | 2024-05-16 | 2024-07-26 | 靖江特殊钢有限公司 | High-strength and high-toughness oil well pipe for shale gas and manufacturing process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118389040A (en) * | 2024-05-16 | 2024-07-26 | 靖江特殊钢有限公司 | High-strength and high-toughness oil well pipe for shale gas and manufacturing process thereof |
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