High-performance pressure-bearing wellhead cross and additive manufacturing method and application thereof

Abstract

This invention discloses a high-performance pressure-bearing wellhead tee and its additive manufacturing method and application, belonging to the technical field of oil and gas exploration and development equipment. The additive manufacturing method for the high-performance pressure-bearing wellhead tee of this invention includes the following steps: establishing a printing model of the additive-manufactured wellhead tee based on the service conditions of ultra-deep wells; dividing the printing model into different load-bearing areas and functional areas according to structural strength requirements and load-bearing analysis; and completing the additive printing of each load-bearing area and functional area based on the divided load-bearing area and functional area. This invention's additive manufacturing method for the high-performance pressure-bearing wellhead tee utilizes the flexibility of additive manufacturing to improve the strength of the wellhead tee from both material and structural aspects, thereby meeting the technical requirements of high pressure bearing capacity, and meets the high corrosion resistance requirements through the design of locally highly corrosion-resistant materials.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for exploration and development in the oil and gas industry, specifically to a high-performance pressure wellhead cross-junction and its additive manufacturing method and application. Background Technology

[0002] The exploration and development of key oil and gas blocks has shifted towards deeper ground, with the first 10,000-meter deep geological exploration well officially crossing the 10,000-meter mark. The wellhead equipment is the main equipment at the top of the oil and gas well for controlling and regulating oil and gas production. The wellhead equipment not only withstands internal pressures exceeding 100 MPa, but also bears part of the weight of the casing connecting to the downhole layers, and regulates and controls oil well production.

[0003] Wellhead tees are connecting components of wellhead equipment, and in China, they are mostly precision-machined from low-alloy high-strength steel forgings. Due to the high load-bearing capacity and extreme corrosion resistance required for service environments, the original forging blanks of wellhead equipment (such as tees and flanges) are as thick as 100mm, resulting in low material utilization. Furthermore, after tempering heat treatment, the core has poor hardenability. Martensitic stainless steel forgings have good hardenability, but are prone to hot cracking. With the continuous increase in drilling depth, existing low-alloy steel and martensitic stainless steel materials cannot simultaneously meet the requirements of ultra-high pressure wellhead equipment, which need strength above 90K, NL-grade sulfur resistance, high corrosion resistance, and lightweight design.

[0004] Patent CN108907061A discloses a method for manufacturing a tree-head four-way valve. Specifically, it discloses that the strength of the tree-head four-way valve can be effectively improved by manufacturing methods such as forging and heat treatment. However, the four-way valve prepared by this patent has poor corrosion resistance.

[0005] As a transformative technological innovation, electric arc additive manufacturing has become a novel intelligent manufacturing method for metal components, operating alongside traditional manufacturing technologies. This technology successfully bypasses the technological bottlenecks in manufacturing large castings and forgings, and is not limited by industrial equipment manufacturing capabilities. Summary of the Invention

[0006] The purpose of this invention is to provide a high-performance pressure wellhead cross-shaped fitting and its additive manufacturing method and application, which solves the technical problem that low alloy steel and martensitic stainless steel materials in the prior art cannot meet the performance requirements of ultra-high pressure wellhead equipment.

[0007] To achieve the above objectives, one embodiment of the present invention provides an additive manufacturing method for a high-performance pressure wellhead tee, comprising the following steps:

[0008] Based on the service conditions of ultra-deep wells, establish a printing model for additive manufacturing wellhead cross-sections;

[0009] Based on structural strength requirements and load-bearing analysis, the printed model is divided into different load-bearing areas and functional areas;

[0010] Based on the defined load-bearing and functional areas, additive printing is completed for each load-bearing and functional area.

[0011] One preferred embodiment of the present invention is to establish a printing model of an additively manufactured wellhead cross-junction based on the service conditions of an ultra-deep well, including: calculating the required structural strength, minimum wall thickness, maximum load-bearing parts and corrosion sites of the wellhead cross-junction based on the service conditions of the ultra-deep well, and establishing a printing model of the additively manufactured wellhead cross-junction.

[0012] In one preferred embodiment of the present invention, the load-bearing area and functional area include a general load-bearing area, a high-stress load-bearing area, and a high-corrosion-resistant area.

[0013] In one preferred embodiment of the present invention, the ordinary load-bearing area uses low-alloy high-strength steel printing material, the high-stress load-bearing area uses a heterogeneous material of high-strength steel and austenitic stainless steel, and the high-corrosion-resistant area uses a high-strength corrosion-resistant material.

[0014] One preferred embodiment of the present invention is a low-alloy high-strength steel printing material comprising the following chemical composition in the indicated mass percentages: C: ≤0.08%, Si: ≤0.5%, Mn: ≤1.0%, P ≤0.035%, S ≤0.04%, with the balance being Fe.

[0015] One preferred embodiment of the present invention is a high-strength steel comprising the following chemical composition in the indicated mass percentages: C: ≤0.10%, Si: ≤0.12%, Mn: ≤1.65%, P ≤0.010%, S ≤0.005%, Ni: 0.3%-0.5%, Mo: 0.4%-1.0%, Cr: 11.5%-14%, with the balance being Fe.

[0016] One preferred embodiment of the present invention is an austenitic stainless steel comprising the following chemical composition in the indicated mass percentages: C: ≤0.10%, Si: 0.65%-1%, Mn: 6.5%-8%, P≤0.025%, S≤0.020%, Ni: 8.0%-10.5%, Mo: ≤0.75%, Cr: 18%-22%, with the balance being Fe.

[0017] In one preferred embodiment of the present invention, the high-strength corrosion-resistant material is a high-corrosion-resistant nickel-based alloy powder, which comprises the following chemical components in the indicated mass percentages: Ni: 58%-62%, Cr: 18%-22%, Mo: 6%-10%, Nb: 2.5%-4.0%; Fe: 0.5%-2.5%, Mn: ≤0.25%, Si: ≤0.15%, C: ≤0.15%.

[0018] One preferred embodiment of the present invention is to complete additive printing of each load-bearing area and functional area based on the division of the load-bearing area and functional area, including: selecting different arc additive printing methods for different areas based on the division of the load-bearing area and functional area, coordinating workstations, working paths and subtraction positions, and performing additive printing of different areas respectively.

[0019] One preferred embodiment of the present invention involves additive printing of each load-bearing area and functional area based on the defined load-bearing area and functional area, including the following steps:

[0020] Select additive manufacturing base columns;

[0021] Plan the printing path for the high-stress load-bearing area, and print the high-stress load-bearing area according to the printing path;

[0022] After printing the high-stress load-bearing areas, print the ordinary load-bearing areas;

[0023] After the ordinary load-bearing area is printed, the highly corrosion-resistant area is clad to obtain the wellhead four-way connector.

[0024] In one preferred embodiment of the present invention, after the ordinary bearing area is printed, the additively printed workpiece is subjected to heat treatment and secondary processing. After the secondary processing is completed, the highly corrosion-resistant area is clad.

[0025] The present invention also discloses a high-performance pressure-bearing wellhead cross, which is prepared by the additive manufacturing method of the above-mentioned high-performance pressure-bearing wellhead cross.

[0026] This invention also discloses the application of a high-performance pressure-bearing wellhead cross-junction, which is used in deep / ultra-deep wells.

[0027] In summary, the beneficial effects of the present invention are as follows:

[0028] 1. The additive manufacturing method of the high-performance pressure-bearing wellhead tee of the present invention is based on the load-bearing analysis of the wellhead tee. Through the integrated design of material-structure-function, an additive manufacturing structural model of the wellhead tee is established. The composite electric arc additive and subtractive manufacturing process is used to realize the printing of multiple material areas and the internal processing of the pipe body to meet the requirements of partial load-bearing and corrosion resistance.

[0029] 2. The additive manufacturing method of the high-performance pressure-bearing wellhead cross-junction of the present invention utilizes the flexibility of additive manufacturing to improve the strength of the wellhead cross-junction from both material and structural aspects, thereby meeting the technical requirements of high pressure bearing, and meets the requirements of high corrosion resistance through the design of local high corrosion-resistant materials.

[0030] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention will be apparent from the effects described in the description and the accompanying drawings. Attached Figure Description

[0031] Figure 1 This is a schematic flowchart of the additive manufacturing method for the high-performance pressure-bearing wellhead cross-junction of the present invention.

[0032] Figure 2 This is a structural load-bearing analysis diagram of the wellhead cross-junction in this invention;

[0033] Figure 3 This is a structural diagram of the wellhead four-way connector in this invention;

[0034] Figure 4 This is a printing path planning diagram for the high-stress bearing area in this invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides an additive manufacturing method for a high-performance pressure-bearing wellhead tee, such as... Figure 1 As shown, it includes the following steps:

[0037] Step (1): Based on the service conditions of the ultra-deep well, establish a printing model of the additively manufactured wellhead tee; specifically, based on the service conditions of the ultra-deep well, calculate the required structural strength, minimum wall thickness, maximum load-bearing parts and corrosion sites during use of the wellhead tee, and establish a printing model of the additively manufactured wellhead tee. The structural load-bearing analysis diagram of the wellhead tee is shown below. Figure 2 As shown;

[0038] Step (2): Based on the structural strength requirements and load-bearing analysis, the printed model is divided into different load-bearing areas and functional areas; specifically, according to the load-bearing requirements, it is divided into: ordinary load-bearing area (A) and high stress load-bearing area (B); according to the corrosion resistance requirements, it is divided into: high corrosion resistance area (C). The structural division diagram of the wellhead four-way is shown in Figure 3.

[0039] Among them, the ordinary load-bearing area (A) uses low alloy high-strength steel printing material, the high stress load-bearing area (B) uses a heterogeneous material of high-strength steel and austenitic stainless steel, combining soft and hard materials, and the high corrosion-resistant area (C) is the inner wall and end sealing surface of the wellhead four-way, which uses high-strength corrosion-resistant material.

[0040] ① Ordinary load-bearing area (A): The solid welding wire made of low alloy high-strength steel is used, and includes the following chemical composition by mass percentage: C: ≤0.08%, Si: ≤0.5%, Mn: ≤1.0%, P≤0.035%, S≤0.04%, with the balance being Fe; the low alloy high-strength steel is produced by submerged arc additive manufacturing process, the wire is φ4mm, and the tensile strength is ≥621MPa;

[0041] ② High stress bearing area (B):

[0042] (1) The high-strength steel solid welding wire used has the following chemical composition in the following mass percentage ratio: C: ≤0.10%, Si: ≤0.12%, Mn: ≤1.65%, P≤0.010%, S≤0.005%, Ni: 0.3%-0.5%, Mo: 0.4%-1.0%; Cr: 11.5%-14%, with the balance being Fe; the high-strength steel solid welding wire is printed using CMT process, with a wire diameter of φ0.8mm-1.2mm and a tensile strength ≥724MPa;

[0043] (2) The austenitic stainless steel solid welding wire used has the following chemical composition in the following mass percentage ratio: C: ≤0.10%, Si: 0.65%-1%, Mn: 6.5%-8%, P≤0.025%, S≤0.020%, Ni: 8.0%-10.5%, Mo: ≤0.75%, Cr: 18%-22%, with the balance being Fe; wherein, the austenitic stainless steel is printed using plasma printing process and cross-printed with high-strength steel solid welding wire, the wire is φ0.8mm-1.2mm, and the tensile strength is ≥590MP;

[0044] ③ High corrosion resistant area (C): The high-strength corrosion resistant material used is high corrosion resistant nickel-based alloy powder. The high corrosion resistant nickel-based alloy powder includes the following chemical composition in the following mass percentage ratio: Ni: 58%-62%, Cr: 18%-22%, Mo: 6%-10%, Nb: 2.5%-4.0%; Fe: 0.5%-2.5%, Mn: ≤0.25%, Si: ≤0.15%, C: ≤0.15%; Among them, the nickel-based alloy powder is printed by laser coaxial powder feeding cladding process, and the powder particle size is 20μm-50μm.

[0045] Step (3): Based on the divided load-bearing area and functional area, complete the additive printing of each load-bearing area and functional area; for the printing structure of the wellhead four-way, design the electric arc additive printing method for different areas, coordinate the work station, working path and subtractive position, and use electric arc and plasma composite additive processes to perform additive printing of different areas respectively. Specifically, it includes the following steps:

[0046] Step (301): Select additive base column; specifically, design intersecting circular tubes as additive base columns, the thickness of the base column is about 2mm, the material is low alloy steel, and the tensile strength is ≥590MPa;

[0047] Step (302): Plan the printing path for the high-stress load-bearing area, and print the high-stress load-bearing area according to the printing path; specifically, this includes:

[0048] A composite additive manufacturing process combining plasma and dual-wire CMT (Continuous Metal-Mounted Tunneling) was employed, along with a robot and rotary positioner collaborative additive manufacturing system, to print high-stress load-bearing areas. The plasma torch was used to print the austenitic stainless steel solid welding wire, while the dual-wire CMT was used to print the high-strength steel solid welding wire. Both the plasma torch and the dual CMT torches were mounted on the robot, and the intersecting circular tubes were rotated by the positioner. This combination ensured a flat welding additive manufacturing posture during printing. The plasma and CMT cross-printing processes were as follows: For the plasma process of printing the austenitic stainless steel solid welding wire, the following parameters were used: DC positive polarity, arc voltage of 25V, nozzle orifice diameter of 3.2mm, pure argon gas flow rate of 0.9L / min, tungsten electrode retraction of 3mm, printing current of 110A-130A, and deposition rate of 9.5cm / min. -1 -12.5cm.min -1 The wire feeding speed is 0.4 m / min. -1 -0.6m.min -1 The CMT process for additive printing high-strength steel solid welding wire is as follows: printing current 140A-165A, arc voltage 15.5V-16.5V, and wire feed speed 0.4m / min. -1 -0.6m.min -1 ;

[0049] The printing path planning for high-stress load-bearing areas is as follows: First, high-strength steel is printed using a dual-wire rotary printer, with the interlayer temperature controlled at 150℃-200℃. Then, plasma follows the printing path to print austenitic stainless steel. Each layer is printed with high-strength, high-toughness austenitic stainless steel using an interleaved path method, forming a macroscopically heterogeneous but microscopically tightly bonded metallurgical structure. The specific printing path planning is as follows: Figure 4 As shown;

[0050] Step (303): After the high-stress load-bearing area is printed, the ordinary load-bearing area is printed. Specifically, the submerged arc additive manufacturing process is used, and the ordinary load-bearing area is printed in conjunction with the robot + rotary positioner collaborative additive manufacturing system. The submerged arc welding gun is installed on the robot and always maintains flat welding. The voltage of submerged arc additive manufacturing is 28V-30V, the current is 500A-600A, the wire feeding speed is 600mm / min, and the overlap width is greater than 8mm.

[0051] Step (304): After the ordinary load-bearing area is printed, the highly corrosion-resistant area is clad to obtain the wellhead four-way connector; specifically, this includes:

[0052] Step (3041): After the wellhead four-way connector is printed as a whole, the internal base pipe is removed through secondary processing. The secondary processing accuracy should reach 0.1mm-0.3mm.

[0053] Step (3042): Heat-treat the workpiece after additive printing. The heat treatment process is about 50°C lower than the lowest phase transformation point AC1 (the temperature at which pearlite transforms into austenite) of all printing materials.

[0054] Step (3043): After the secondary processing is completed, high corrosion resistant nickel-based alloy powder is clad onto the inner and outer surfaces of the high corrosion resistant area using laser ultra-high speed cladding technology. The cladding process parameters are as follows: cladding power is 3000W-3500W, cladding speed is 5m / min-10m / min, powder feeding speed is 3r / min-4r / min, single pass transverse movement is 1.0mm-1.2mm, the cladding thickness per pass is 0.8mm-1.1mm, and 3 layers are clad.

[0055] Step (3044): The end sealing surface and flange hole of the wellhead tee are machined according to the standard requirements, and non-destructive testing is performed to complete the additive manufacturing of the wellhead tee.

[0056] The present invention also discloses a high-performance pressure wellhead cross, which is prepared by the above-mentioned additive manufacturing method.

[0057] This invention also discloses the application of a high-performance pressure-bearing wellhead cross-junction, which is used in deep / ultra-deep wells.

[0058] Example

[0059] An additive manufacturing method for a high-performance pressure-bearing wellhead tee includes the following steps:

[0060] Step (1): Based on the service conditions of the ultra-deep well, calculate the required pressure of 120MPa, structural strength of 570MPa, minimum wall thickness of 55mm for the wellhead cross-junction, and establish a printing model for additive manufacturing of the wellhead cross-junction.

[0061] Step (2): According to load-bearing requirements, the area is divided into ordinary load-bearing area and high stress load-bearing area; according to corrosion resistance requirements, the area is divided into high corrosion resistance area;

[0062] The ordinary load-bearing area uses solid welding wire made of low-alloy high-strength steel, with the following chemical composition by mass percentage: C: 0.08%, Si: 0.5%, Mn: 0.7%, P: 0.035%, S: 0.04%, Nb: 0.07%, Ni: 0.025%, Mo: 0.024%, Cr: 0.04%, V: 0.007%, with the balance being Fe. The low-alloy high-strength steel is produced using submerged arc additive manufacturing technology, with the wire being φ4mm and having a tensile strength of 650MPa.

[0063] The high-stress load-bearing area uses a heterogeneous material of high-strength steel and austenitic stainless steel. The high-strength steel solid welding wire has the following chemical composition by mass percentage: C: 0.10%, Si: 0.12%, Mn: 1.65%, P: 0.010%, S: 0.005%, Ni: 0.5%, Mo: 0.6%, Cr: 12%, with the balance being Fe. The high-strength steel solid welding wire is produced using CMT (cold metal transfer) printing technology, with a wire diameter of φ1.0mm and a tensile strength of 750MPa.

[0064] The austenitic stainless steel solid welding wire comprises the following chemical composition by mass percentage: C: 0.10%, Si: 0.7%, Mn: 7%, P: 0.025%, S: 0.020%, Ni: 9.5%, Mo: 0.75%, Cr: 20%, with the balance being Fe. The austenitic stainless steel is printed using a plasma printing process, cross-printed with high-strength steel solid welding wire. The wire is 1.0 mm thick and has a tensile strength of 620 MPa.

[0065] The highly corrosion-resistant areas are the inner wall and end sealing surface of the wellhead cross passage, which are made of highly corrosion-resistant nickel-based alloy powder. The highly corrosion-resistant nickel-based alloy powder includes the following chemical composition by mass percentage: Ni: 60%, Cr: 20%, Mo: 8%, Nb: 2.9%, Fe: 1.5%, Mn: 0.25%, Si: 0.15%, C: 0.15%. The nickel-based alloy powder is printed using a laser coaxial powder feeding cladding process, and the powder particle size is 30μm.

[0066] Step (3): For the printing structure of the wellhead four-way connector, design the electric arc additive printing method for different areas, the collaborative workstation, working path and subtraction position, and use electric arc and plasma composite additive printing processes to perform additive printing in different areas respectively; wherein:

[0067] (1) Design intersecting circular tubes as additive base columns. The thickness of the base columns is about 2mm, the material is low alloy steel, and the tensile strength is 600MPa.

[0068] (2) A composite additive manufacturing process combining plasma and dual-wire CMT is employed, along with a robot + rotary positioner collaborative additive manufacturing system, to print high-stress load-bearing areas. Plasma is used for printing austenitic stainless steel solid welding wire, while dual-wire CMT is used for printing high-strength steel solid welding wire. Both the plasma welding torch and the dual CMT torches are mounted on the robot, and the intersecting circular tube is rotated by the positioner. This combination ensures a flat welding additive manufacturing posture during printing. The plasma and CMT cross-printing processes are as follows: The plasma process for additive printing austenitic stainless steel solid welding wire is: DC positive polarity, arc voltage of 25V, nozzle orifice diameter of 3.2mm, ion gas using pure argon with a flow rate of 0.9L / min, tungsten electrode retraction of 3mm, printing current of 120A, and deposition rate of 11.5cm / min. -1 The wire feeding speed is 0.5 m / min. -1 The CMT process for additive printing high-strength steel solid welding wire is as follows: printing current is 155A, arc voltage is 16.0V, and wire feed speed is 0.5m / min. -1 ;

[0069] (3) The printing path planning for the high stress bearing area is as follows: First, high-strength steel is printed by double-wire rotary printing, and the interlayer temperature is controlled at 180℃. The plasma follows the printing of austenitic stainless steel in the interlayer. Each layer is printed with high-strength and tough austenitic stainless steel in an interleaved path manner to form a macroscopic heterogeneous but microscopically tightly bonded metallurgical structure.

[0070] (4) The submerged arc additive manufacturing process is adopted, and the ordinary load-bearing area is printed in conjunction with the robot + rotary positioner collaborative additive manufacturing system. The submerged arc welding gun is installed on the robot and always maintains flat welding. The voltage of submerged arc additive manufacturing is 29V, the current is 550A, the wire feeding speed is 600mm / min, and the overlap width is 10mm.

[0071] (5) After the wellhead four-way connector is printed as a whole, the internal base pipe is removed by secondary processing. The secondary processing accuracy should reach 0.2mm.

[0072] Step (4): Perform heat treatment and secondary processing on the workpiece after additive printing. The heat treatment temperature is 550℃.

[0073] Step (5): After the secondary processing is completed, high corrosion resistant nickel-based alloy powder is clad onto the inner and outer surfaces of the high corrosion resistant area using laser ultra-high speed cladding technology. The cladding process parameters are: cladding power 3400W, cladding speed 8m / min, powder feeding speed 4r / min, single pass transverse movement 1.1mm; the cladding thickness of each pass is 0.9mm, and 3 layers are clad.

[0074] Step (6): Machin the end sealing surface and flange hole of the wellhead cross according to the standard requirements, perform non-destructive testing, and complete the additive manufacturing of the wellhead cross.

[0075] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method of additive manufacturing of a high performance pressure containing wellhead cross, characterized by, Includes the following steps: Based on the service conditions of ultra-deep wells, establish a printing model for additive manufacturing wellhead cross-sections; Based on structural strength requirements and load-bearing analysis, the printed model is divided into different load-bearing areas and functional areas; Based on the defined load-bearing and functional areas, additive printing is completed for each load-bearing and functional area.

2. A method of additive manufacturing of a high performance pressure wellhead cross according to claim 1, characterized in that: The process of establishing a printing model for an additively manufactured wellhead cross-junction based on the service conditions of the ultra-deep well includes: calculating the required structural strength, minimum wall thickness, maximum load-bearing parts and corrosion sites during use based on the service conditions of the ultra-deep well, and establishing a printing model for the additively manufactured wellhead cross-junction.

3. A method of additive manufacturing of a high performance pressure wellhead cross according to claim 1, characterized in that: The load-bearing area and functional area include a general load-bearing area, a high-stress load-bearing area, and a high-corrosion-resistant area.

4. A method of additive manufacturing of a high performance pressure wellhead cross according to claim 3, characterized in that: The ordinary load-bearing area uses low-alloy high-strength steel printing material, the high-stress load-bearing area uses a heterogeneous material of high-strength steel and austenitic stainless steel, and the high corrosion-resistant area uses high-strength corrosion-resistant material.

5. A method of additive manufacturing of a high performance pressure wellhead cross according to claim 4, characterized in that, The low-alloy high-strength steel printing material comprises the following chemical components in the indicated mass percentages: C: ≤0.08%, Si: ≤0.5%, Mn: ≤1.0%, P ≤0.035%, S ≤0.04%, with the balance being Fe.

6. A method of additive manufacturing of a high performance pressure wellhead cross according to claim 4, characterized in that, The high-strength steel comprises the following chemical composition in the following mass percentages: C: ≤0.10%, Si: ≤0.12%, Mn: ≤1.65%, P≤0.010%, S≤0.005%, Ni: 0.3%-0.5%, Mo: 0.4%-1.0%, Cr: 11.5%-14%, with the balance being Fe.

7. A method of additive manufacturing of a high performance pressure wellhead cross according to claim 4, characterized in that, The austenitic stainless steel comprises the following chemical composition in the following mass percentages: C: ≤0.10%, Si: 0.65%-1%, Mn: 6.5%-8%, P≤0.025%, S≤0.020%, Ni: 8.0%-10.5%, Mo: ≤0.75%, Cr: 18%-22%, with the balance being Fe.

8. The additive manufacturing method for a high-performance pressure-bearing wellhead tee as described in claim 4, characterized in that, The high-strength corrosion-resistant material is a high-corrosion-resistant nickel-based alloy powder, which comprises the following chemical components in the indicated mass percentages: Ni: 58%-62%, Cr: 18%-22%, Mo: 6%-10%, Nb: 2.5%-4.0%. Fe: 0.5%-2.5%, Mn: ≤0.25%, Si: ≤0.15%, C: ≤0.15%.

9. The additive manufacturing method for a high-performance pressure wellhead cross-section as described in claim 1, characterized in that: The process of completing additive printing for each load-bearing area and functional area based on the division includes: selecting different arc additive printing methods for different areas based on the division of load-bearing areas and functional areas, coordinating workstations, work paths, and subtraction positions, and performing additive printing for different areas respectively.

10. The additive manufacturing method for a high-performance pressure-bearing wellhead cross-junction as described in claim 1 or 9, characterized in that: The additive printing of each load-bearing area and functional area based on the division includes the following steps: Select additive manufacturing base columns; Plan the printing path for the high-stress load-bearing area, and print the high-stress load-bearing area according to the printing path; After printing the high-stress load-bearing areas, print the ordinary load-bearing areas; After the ordinary load-bearing area is printed, the highly corrosion-resistant area is clad to obtain the wellhead four-way connector.

11. The additive manufacturing method for a high-performance pressure-bearing wellhead cross-section as described in claim 10, characterized in that: After the ordinary load-bearing area is printed, the additively printed workpiece is subjected to heat treatment and secondary processing. After the secondary processing is completed, the highly corrosion-resistant area is clad.

12. A high-performance pressure wellhead cross-junction, characterized in that: It is prepared by the additive manufacturing method of the high-performance pressure wellhead cross-shaped fitting according to any one of claims 1-11.

13. An application of a high-performance pressure wellhead cross-junction according to claim 12, characterized in that: High-performance pressure-bearing wellhead four-way valves are used in deep / ultra-deep wells.

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