CN113046651A - Corrosion-resistant X65MS steel-grade continuous tube and manufacturing method thereof - Google Patents
Corrosion-resistant X65MS steel-grade continuous tube and manufacturing method thereof Download PDFInfo
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for 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
- 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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- 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
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention belongs to the technical field of coiled tubing, and particularly relates to a corrosion-resistant X65MS steel-grade coiled tubing and a manufacturing method thereof. The corrosion-resistant X65MS steel-grade continuous tube comprises the following plate components in percentage by mass: c: 0.03-0.06%, Si: 0.15 to 0.25%, Mn: 0.40-0.60%, P: less than or equal to 0.006 percent, S: less than or equal to 0.009%, Ni: 0.10-0.20%, Cr: 0.30-0.60%, Cu: 0.20-0.40%, Mo: less than or equal to 0.050%, Nb: less than or equal to 0.10 percent, Ti: less than or equal to 0.015 percent, N: less than or equal to 0.0050%, Al: less than or equal to 0.050%, B: less than or equal to 0.00050 percent, Ca: 0.0020 to 0.0040% and the balance of Fe and unavoidable impurities. The successful development of the X65MS steel-grade continuous pipe can solve the problem that the carbon steel continuous pipe is easy to corrode and lose efficacy in an acid environment to a certain extent.
Description
Technical Field
The invention belongs to the technical field of coiled tubing, and particularly relates to a corrosion-resistant X65MS steel-grade coiled tubing and a manufacturing method thereof.
Background
The coiled tubing is widely applied to the fields of oil and gas field well repair, well drilling, well completion, well logging, perforation, fracturing, bridge plug drilling and grinding and the like due to a series of advantages of low cost, small occupied area, convenient use, high safety factor, quick operation period, pressurized operation and the like, and plays an increasingly important role in oil and gas field exploration and development.
In recent years, with the continuous promotion of energy strategy in China, deep oil gas resource proportion is increasing day by day, deep wells, ultra-deep wells and wells containing H2S、CO2The oil gas well is more and more, and the service environment of coiled tubing is more and more abominable, leads to the coiled tubing failure accident more and more frequently. The X65MS raw material for the economical conveying pipe is adopted to manufacture a coiled tubing product, so that the cost can be greatly reduced, the failure accidents of local corrosion, perforation, cracking and the like of the coiled tubing in an acid environment can be effectively prevented, and an equipment tool is provided for ensuring the safety and high-efficiency exploitation of oil and gas resources.
The Chinese patent application No. 201310470450.2 discloses 'X65 MS/X70MS spiral submerged arc welded pipe with excellent SSCC stress corrosion resistance and a manufacturing method thereof', the product mainly adopts the technologies of low stress forming, corrosion-resistant welding wire and flux welding, heat input line energy control and the like to obtain the X65MS/X70MS steel grade spiral submerged arc welded pipe with high strength, high toughness and excellent SSCC stress corrosion resistance, and the pipe diameter of the manufactured pipe is phi 508 mm.
Disclosure of Invention
The invention aims to provide a corrosion-resistant X65MS steel-grade continuous tube and a manufacturing method thereof, wherein the continuous tube is manufactured by adopting an X65MS coiled plate in a low-cost acid corrosion environment, and has good mechanical property and excellent acid medium corrosion resistance.
The realization process of the invention is as follows:
a corrosion-resistant X65MS steel-grade continuous tube comprises the following plate components in percentage by mass: c: 0.03-0.06%, Si: 0.15 to 0.25%, Mn: 0.40-0.60%, P: less than or equal to 0.006 percent, S: less than or equal to 0.009%, Ni: 0.10-0.20%, Cr: 0.30-0.60%, Cu: 0.20-0.40%, Mo: less than or equal to 0.050%, Nb: less than or equal to 0.10 percent, Ti: less than or equal to 0.015 percent, N: less than or equal to 0.0050%, Al: less than or equal to 0.050%, B: less than or equal to 0.00050 percent, Ca: 0.0020 to 0.0040% and the balance of Fe and unavoidable impurities.
The manufacturing method of the corrosion-resistant X65MS steel-grade continuous pipe comprises the following steps:
(1) the plate comprises the following components in percentage by mass: c: 0.03-0.06%, Si: 0.15 to 0.25%, Mn: 0.40-0.60%, P: less than or equal to 0.006 percent, S: less than or equal to 0.009%, Ni: 0.10-0.20%, Cr: 0.30-0.60%, Cu: 0.20-0.40%, Mo: less than or equal to 0.050%, Nb: less than or equal to 0.10 percent, Ti: less than or equal to 0.015 percent, N: less than or equal to 0.0050%, Al: less than or equal to 0.050%, B: less than or equal to 0.00050 percent, Ca: 0.0020-0.0040% and the balance of Fe and inevitable impurities, mixing the raw materials to form molten iron, rolling the corrosion resistant steel plate, pickling, detecting, and finally curling into an X65MS coiled plate;
(2) according to the working condition requirement, the X65MS coiled plate is cut into steel strips with different widths by a slitting unit;
(3) butt-jointing the ends of the front and the rear steel strips and then welding the ends into the length required by the working condition;
(4) controlling the forming of the butted steel belt by adopting a row roller forming method;
(5) longitudinally butt-welding the formed steel strips together by adopting a high-frequency induction welding method to prepare a continuous tube, and adopting gas protection in the welding process to prevent oxides from being brought in the welding process;
(6) carrying out weld seam heat treatment on the continuous pipe;
(7) carrying out whole tube heat treatment on the continuous tube;
(8) carrying out nondestructive testing on the welded and formed continuous pipe, and sizing the continuous pipe;
(9) and (4) performing antiseptic treatment on the outer surface of the continuous pipe, and coiling the continuous pipe onto a reel for packaging.
Further, in the step (2), the width of the steel strip is 80-300 mm.
Further, in the step (3), the welding adopts filler wire welding, and the components and the mechanical properties of the selected welding wires are the same as those of the base metal; and welding the ends of the front and the rear steel strips in a 45-degree oblique welding mode, and heating and rolling oblique welding seams after the steel strips are butted, wherein the rolling pressure is 5 tons.
Further, in the step (5), in the high-frequency induction welding method, the welding speed of the high-frequency induction welding is 20-25 m/min, and the protective gas is argon or nitrogen; the outer diameter of the continuous tube is phi 25.4-phi 88.9mm, and the wall thickness is 1.91-6.35 mm.
Further, in the step (6), the specific process of the weld seam heat treatment is to rapidly heat the weld seam of the continuous tube to 900-930 ℃, then perform air cooling, and perform water cooling after the air cooling is performed to 380-420 ℃, wherein the water cooling speed is 15-30 ℃/s.
Further, in the step (7), the whole-tube heat treatment specifically comprises the steps of rapidly heating the continuous tube to 400-750 ℃, then carrying out air cooling, and carrying out water cooling after the air cooling is carried out to 300-350 ℃, wherein the water cooling speed is 15-30 ℃/s.
Further, in the step (8), the nondestructive testing comprises 100% of whole pipe body magnetic leakage testing and 100% of welding seam eddy current testing, and the coverage rate of the probe is 120%.
Further, in the step (9), the outer surface of the continuous pipe is subjected to oil coating treatment to prevent the surface of the continuous pipe from being oxidized.
The invention has the following positive effects:
(1) compared with the technology for manufacturing the common carbon steel continuous tube, the manufacturing method of the corrosion-resistant X65MS steel-grade continuous tube takes the corrosion-resistant X65MS hot-rolled coil as a raw material, adopts special welding wires for butt joint of steel strips, and carries out nondestructive detection on a butt joint weld, thereby ensuring the good quality of the oblique weld of the continuous tube. The residual stress control and the welding process parameter control in the forming process are enhanced, the heat treatment is carried out on the welding seam and the whole pipe body in a special heat treatment and cooling mode, and the condition that the tissues of the welding seam and the heat affected zone of the pipe tend to be consistent with those of the base metal is ensured. The successful development of the X65MS steel-grade continuous pipe can solve the problem that the carbon steel continuous pipe is easy to corrode and lose efficacy in an acid environment to a certain extent.
(2) The ultra-low C component design is adopted, adverse effects on the toughness, plasticity, weldability and the like of the pipe caused by overhigh C content are avoided, meanwhile, the formation of a banded pearlite structure is promoted by the increase of the carbon content, and the HIC and SCC resistance is obviously reduced. The low Mn component design is adopted, mainly because Mn is easy to have affinity with S in steel to form MnS inclusion, and Mn is easy to be segregated in a grain boundary together with impurities such as P, S, and the toughness, HIC (hydrogen induced cracking) resistance and SCC (SCC) resistance of the steel are reduced.
(3) Certain amounts of Cu and Ni are added, the content of P, S impurity elements is strictly controlled, and strip-shaped sulfide inclusions are converted into spheres through Ca treatment, so that internal defects such as non-metal inclusions, element segregation, banded structures and the like in the material are reduced, and the corrosion resistance of the material in an acid environment is improved.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The corrosion resistant X65MS steel grade coiled tubing of this example has the sheet composition shown in Table 1.
The manufacturing method of the corrosion-resistant X65MS steel-grade continuous pipe comprises the following steps:
(1) mixing raw materials according to the mass percentage of plate components (table 1) to form molten iron, deeply desulfurizing the molten iron to be below 0.009%, compositely converting the top and the bottom of a converter, adding micro-alloy elements (nickel, chromium, copper and the like), refining the molten iron in an LF furnace, vacuum degassing in an RH furnace, continuously casting a plate blank, slowly cooling the cast plate, heating the plate blank to 1250 +/-10 ℃, roughly rolling the plate blank at 1100 +/-10 ℃, finely rolling the plate blank at 850 +/-10 ℃ to the thickness required by working conditions, cooling the plate blank to 550-600 ℃ at the cooling speed of 60-70 ℃/s, then curling the plate blank, completely cooling the plate blank, pickling the plate blank, and finally coiling the plate blank into an X65MS coiled plate.
(2) According to the working condition requirement, the X65MS coiled plate is cut into a steel strip with the width of 120.2mm by a longitudinal shearing unit; and the steel strip can be cut into any value with the width of 80-300 mm according to the working condition requirement.
(3) According to the length requirement of the continuous pipe, the ends of the front and rear steel belts are butted, plasma welding is adopted for butting the steel belts, the used welding wire is a special welding wire, the components of the welding wire are shown in table 2, and heat treatment and rolling are carried out on the butted welding line after welding; the components and mechanical properties of the selected welding wires are the same as those of the base metal; welding the end heads of the front and the rear steel strips in a 45-degree oblique welding mode, and heating and rolling oblique welding seams after the steel strips are butted, wherein the rolling pressure is 5 tons;
(4) controlling the forming of the lengthened steel belt by adopting a row roller forming method;
(5) adopting a high-frequency induction welding method to longitudinally butt-weld the formed steel strips together to prepare a continuous tube, wherein N is adopted in the welding process2Or argon protection, accurately controlling parameters such as welding speed, welding machine power, welding current and the like, and ensuring smooth transition of a welding line without oxides, inclusions and welding defects. In the high-frequency induction welding method, the welding speed of high-frequency induction welding is 20-25 m/min, and the protective gas is argon or nitrogen; the outer diameter of the continuous tube is phi 25.4-phi 88.9mm, and the wall thickness is 1.91-6.35 mm;
(6) carrying out weld seam heat treatment on the continuous pipe: rapidly heating the welding seam of the continuous pipe to 925 ℃, then carrying out air cooling, carrying out water cooling after the air cooling is carried out to 400 ℃, wherein the water cooling speed is 20 ℃/s;
(7) carrying out whole tube heat treatment on the continuous tube: rapidly heating the continuous pipe to 720 ℃, then performing air cooling, performing water cooling after the air cooling is performed to 320 ℃, wherein the water cooling speed is 20 ℃/s;
(8) carrying out nondestructive testing on the welded and formed continuous pipe, and sizing the continuous pipe; the nondestructive testing comprises 100% of whole pipe body magnetic flux leakage testing and 100% of welding seam eddy current testing, and the coverage rate of a probe is 120%;
(9) and performing anti-corrosion treatment on the outer surface of the continuous pipe, and coiling the continuous pipe onto a winding drum for packaging, wherein the anti-corrosion treatment is to adopt oiling treatment on the outer surface of the continuous pipe to prevent the surface of the continuous pipe from being oxidized.
Through the heat treatment of the welding seam and the whole pipe body, part of residual stress generated in the forming and welding process can be removed, and the welding seam and the heat affected zone structure are optimized, so that the structure and the base metal tend to be consistent.
The mechanical properties of the manufactured corrosion-resistant X65MS coiled tubing are shown in Table 3, and the corrosion-resistant properties are shown in tables 4-7.
TABLE 1X65MS Rolling chemical composition (% by mass)
TABLE 2 welding wire composition (%)
| C | Mn | Si | S | P | Mo | Ni |
| 0.042 | 0.92 | 0.13 | 0.006 | 0.009 | 0.16 | 0.5 |
TABLE 3X65MS coiled tubing mechanical properties
TABLE 4 comparison of corrosion test results of two-material coiled tubing under simulated conditions
TABLE 5 Corrosion conditions
TABLE 6HIC test results
TABLE 7 SSCC test results for various loading forces
Table 1 shows the chemical composition of the X65MS coil, and the chemical composition adopts ultralow C, low Mn and low S, P, and adds Ni, Cr, Cu and other microalloy elements to improve other properties of the corrosion-resistant steel. The ultra-low C component design avoids the adverse effects of overhigh C content on the toughness, plasticity, weldability and the like of the pipe, and meanwhile, the increase of the carbon content promotes the formation of a banded pearlite structure, so that the HIC and SCC resistance is obviously reduced. The low Mn component design is adopted, mainly because Mn is easy to have affinity with S in steel to form MnS inclusion, and Mn is easy to be segregated in a grain boundary together with impurities such as P, S, and the toughness, HIC (hydrogen induced cracking) resistance and SCC (SCC) resistance of the steel are reduced. Table 2 shows the composition system of the steel strip butt welding wire.
Table 3 shows the mechanical properties of the corrosion-resistant X65MS coiled tubing. As can be seen from Table 3, the strength of the X65MS coiled steel tube is greatly improved, and the tube can reach the CT90 steel-grade continuous tube. Table 4 shows the corrosion resistance of the X65MS coiled tubing under the working condition of high mineralization and little CO2, which is the result of the corrosion resistance test under the simulated working condition of the X65MS coiled tubing, and the corrosion resistance of the X65MS coiled tubing is far superior to that of the domestic CT70 coiled tubing. As can be seen from tables 6-7, the base metal and the weld joint of the corrosion-resistant X65MS continuous tube produced under the process condition are not sensitive to HIC. In the SSCC test, when the loading stress level is 90 percent of the nominal yield strength, neither the parent metal nor the welding seam sample cracks or breaks, which far exceeds the loading 72 percent sigmas stress level specified by API Spec 5L, and the HFW welding pipe does not crack or break.
In addition to the parameters mentioned in example 1, the other parameters of the present invention may be "the plate components of the continuous pipe are, in terms of mass percent: c: 0.03-0.06%, Si: 0.15 to 0.25%, Mn: 0.40-0.60%, P: less than or equal to 0.006 percent, S: less than or equal to 0.009%, Ni: 0.10-0.20%, Cr: 0.30-0.60%, Cu: 0.20-0.40%, Mo: less than or equal to 0.050%, Nb: less than or equal to 0.10 percent, Ti: less than or equal to 0.015 percent, N: less than or equal to 0.0050%, Al: less than or equal to 0.050%, B: less than or equal to 0.00050 percent, Ca: 0.0020 to 0.0040% and the balance of Fe and unavoidable impurities. "within interval select. Step (5), in the high-frequency induction welding method, the welding speed of the high-frequency induction welding is 20-25 m/min, and the protective gas is argon or nitrogen; the outer diameter of the continuous tube is phi 25.4-phi 88.9mm, and the wall thickness is 1.91-6.35 mm. In the step (6), the specific process of the weld seam heat treatment is to rapidly heat the weld seam of the continuous tube to 900-930 ℃, then perform air cooling, perform water cooling after the air cooling is performed to 380-420 ℃, and the water cooling speed is 15-30 ℃/s. In the step (7), the whole-tube heat treatment process comprises the steps of rapidly heating the continuous tube to 400-750 ℃, then carrying out air cooling, and carrying out water cooling after air cooling to 300-350 ℃, wherein the water cooling speed is 15-30 ℃/s. Steps (5) to (7) can be selected within the above-mentioned range, and the manufactured continuous pipe can achieve the positive effects of the present invention.
The row roller forming method is a W bending forming method, and has great effect on improving the form and position tolerance grade of the steel pipe, overcoming the adverse factors of steel belt springback, distortion and the like and improving the quality of a finished product pipe by adopting a double-radius eccentric mode and generating an elliptical effect through alternate arrangement of flat rollers and vertical rollers.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and is not intended to limit the invention to the particular forms disclosed. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. The corrosion-resistant X65MS steel-grade continuous pipe is characterized in that the plate components of the continuous pipe are as follows by mass percent: c: 0.03-0.06%, Si: 0.15 to 0.25%, Mn: 0.40-0.60%, P: less than or equal to 0.006 percent, S: less than or equal to 0.009%, Ni: 0.10-0.20%, Cr: 0.30-0.60%, Cu: 0.20-0.40%, Mo: less than or equal to 0.050%, Nb: less than or equal to 0.10 percent, Ti: less than or equal to 0.015 percent, N: less than or equal to 0.0050%, Al: less than or equal to 0.050%, B: less than or equal to 0.00050 percent, Ca: 0.0020 to 0.0040% and the balance of Fe and unavoidable impurities.
2. The method of making a corrosion resistant X65MS steel grade coiled tubing of claim 1, comprising the steps of:
(1) the plate comprises the following components in percentage by mass: c: 0.03-0.06%, Si: 0.15 to 0.25%, Mn: 0.40-0.60%, P: less than or equal to 0.006 percent, S: less than or equal to 0.009%, Ni: 0.10-0.20%, Cr: 0.30-0.60%, Cu: 0.20-0.40%, Mo: less than or equal to 0.050%, Nb: less than or equal to 0.10 percent, Ti: less than or equal to 0.015 percent, N: less than or equal to 0.0050%, Al: less than or equal to 0.050%, B: less than or equal to 0.00050 percent, Ca: 0.0020-0.0040% and the balance of Fe and inevitable impurities, mixing the raw materials to form molten iron, rolling the corrosion resistant steel plate, pickling, detecting, and finally curling into an X65MS coiled plate;
(2) according to the working condition requirement, the X65MS coiled plate is cut into steel strips with different widths by a slitting unit;
(3) butt-jointing the ends of the front and the rear steel strips and then welding the ends into the length required by the working condition;
(4) controlling the forming of the butted steel belt by adopting a row roller forming method;
(5) longitudinally butt-welding the formed steel strips together by adopting a high-frequency induction welding method to prepare a continuous tube, and adopting gas protection in the welding process to prevent oxides from being brought in the welding process;
(6) carrying out weld seam heat treatment on the continuous pipe;
(7) carrying out whole tube heat treatment on the continuous tube;
(8) carrying out nondestructive testing on the welded and formed continuous pipe, and sizing the continuous pipe;
(9) and (4) performing antiseptic treatment on the outer surface of the continuous pipe, and coiling the continuous pipe onto a reel for packaging.
3. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: in the step (2), the width of the steel strip is 80-300 mm.
4. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: in the step (3), the welding adopts filler wire welding, and the components and the mechanical properties of the selected welding wires are the same as those of the base metal; and welding the ends of the front and the rear steel strips in a 45-degree oblique welding mode, and heating and rolling oblique welding seams after the steel strips are butted, wherein the rolling pressure is 5 tons.
5. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: step (5), in the high-frequency induction welding method, the welding speed of the high-frequency induction welding is 20-25 m/min, and the protective gas is argon or nitrogen; the outer diameter of the continuous tube is phi 25.4-phi 88.9mm, and the wall thickness is 1.91-6.35 mm.
6. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: in the step (6), the specific process of the weld seam heat treatment is to rapidly heat the weld seam of the continuous tube to 900-930 ℃, then perform air cooling, perform water cooling after the air cooling is performed to 380-420 ℃, and the water cooling speed is 15-30 ℃/s.
7. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: in the step (7), the whole-tube heat treatment process comprises the steps of rapidly heating the continuous tube to 400-750 ℃, then carrying out air cooling, and carrying out water cooling after air cooling to 300-350 ℃, wherein the water cooling speed is 15-30 ℃/s.
8. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: in the step (8), nondestructive testing comprises 100% of whole pipe body magnetic flux leakage testing and 100% of welding seam eddy current testing, and the coverage rate of the probe is 120%.
9. The method of claim 2, wherein the corrosion resistant X65MS steel grade coiled tubing comprises: in the step (9), the anti-corrosion treatment is to treat the outer surface of the continuous pipe by oiling to prevent the surface of the continuous pipe from being oxidized.
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