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Pipe for 720 MPa-grade high-strength corrosion-resistant titanium alloy drill rod and manufacturing method

A manufacturing method and high-strength technology, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of difficult processing, expensive alloying elements, and high production costs, so as to reduce production costs and increase surface aggregation Effect of thickness and strength improvement

Active Publication Date: 2020-07-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] my country's titanium alloy oil drill pipe is in the research and development stage, its processing is difficult, the alloying elements are expensive, and the production cost is high

Method used

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  • Pipe for 720 MPa-grade high-strength corrosion-resistant titanium alloy drill rod and manufacturing method
  • Pipe for 720 MPa-grade high-strength corrosion-resistant titanium alloy drill rod and manufacturing method
  • Pipe for 720 MPa-grade high-strength corrosion-resistant titanium alloy drill rod and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The invention discloses a method for manufacturing a 720MPa grade high-strength corrosion-resistant titanium alloy drill pipe body,

[0058] Step 1, preparing raw materials according to the composition of the pipe, followed by smelting, casting and forging to obtain a round ingot, the composition of the pipe is calculated by mass percentage, Al 5.75%, V 1.85%, Ru 0.2%, C≤0.05%, N≤0.03%, H≤0.0125%, O≤0.1%, the balance is Ti;

[0059] Step 2, heating the above-mentioned round billet to 1000°C, extruding and deforming after heat preservation for 1 hour, the extrusion ratio of extrusion is 18, and the extrusion speed is 95m / s to obtain a pipe;

[0060] Step 3, after rolling the pipe at 470°C, heat it at 800°C for 1 hour for annealing;

[0061] Step 4, heat the annealed pipe to 960°C, keep it for 1 hour, cool it to 935°C with the furnace, hold it for 1 hour, and cool it down to room temperature naturally;

[0062] Step 5: After applying 1.5% pre-stretching deformation to t...

Embodiment 2

[0065] The invention discloses a method for manufacturing a 720MPa grade high-strength corrosion-resistant titanium alloy drill pipe body,

[0066] Step 1, preparing raw materials according to the composition of the pipe, smelting and casting in sequence to obtain a round ingot, the composition of the pipe is calculated by mass percentage, Al 5.8%, V 1.9%, Ru 0.25%, C≤0.05%, N≤ 0.03%, H≤0.0125%, O≤0.1%, the balance is Ti;

[0067] Step 2, heating the above-mentioned round billet to 1000°C, extruding and deforming after heat preservation for 1 hour, the extrusion ratio of extrusion is 23, and the extrusion speed is 110m / s to obtain a pipe;

[0068] Step 3, after rolling the pipe at 470°C, heat it at 800°C for 1 hour for annealing;

[0069] Step 4, heat the annealed pipe to 965°C, keep it warm for 1 hour, cool it to 935°C with the furnace, keep it warm for 1 hour, and cool it down to room temperature naturally;

[0070] Step 5: After applying 1.8% pre-stretching deformation to...

Embodiment 3

[0077] The invention discloses a method for manufacturing a 720MPa grade high-strength corrosion-resistant titanium alloy drill pipe body,

[0078] Step 1, preparing raw materials according to the composition of the pipe, followed by smelting, casting and forging to obtain a round ingot. The composition of the pipe is calculated by mass percentage, Al 6%, V 1.5%, Ru 0.3%, C≤0.05%, N≤0.03%, H≤0.0125%, O≤0.1%, the balance is Ti;

[0079] Step 2, heating the above-mentioned round billet to 980°C, holding it for 0.8h, and then extruding and deforming it, the extrusion ratio of extrusion is 16, and the extrusion speed is 85m / s to obtain a pipe;

[0080] Step 3, after the pipe is rolled at 450°C, it is kept at 830°C for 0.8h for annealing treatment;

[0081] Step 4, heat the annealed pipe to 950°C, keep it warm for 1.2h, cool it down to 930°C with the furnace, keep it warm for 1.2h, and cool it naturally to room temperature;

[0082] Step 5: After applying 1% pre-stretching deform...

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Abstract

The invention provides a pipe for a 720 MPa-grade high-strength corrosion-resistant titanium alloy drill rod and a manufacturing method. The pipe comprises the following components of, in percentage by mass, 5.5%-6% of Al, 1.5%-2.0% of V, 0.1%-0.3% of Ru, less than or equal to 0.05% of C, less than or equal to 0.03% of N, less than or equal to 0.0125% of H, less than or equal to 0.1% of O, and thebalance Ti, the manufacturing method comprises the following steps that 1, raw materials are prepared according to the components, and smelting, casting and forging are sequentially performed to obtain a round ingot blank; 2, heat preservation is performed after the round ingot blank is heated, the pipe is obtained by extruding, and annealing treatment is performed after the pipe is rolled; 3, the annealed pipe is subjected to heat preservation for 0.8 to 1.2 hours at the temperature of 950 DEG C to 970 DEG C, then subjected to heat preservation for 0.8 to 1.2 hours at the temperature of 930DEG C to 940 DEG C and then naturally cooled to the room temperature; and 4, the pipe is subjected to aging treatment after being subjected to pre-stretching treatment.

Description

technical field [0001] The invention belongs to the technical field of manufacturing oil well pipes in the petroleum and natural gas industry, and in particular relates to pipe materials for 720MPa grade high-strength corrosion-resistant titanium alloy drill pipes and a manufacturing method. Background technique [0002] With the development of the modern petroleum industry and the gradual increase in the demand for oil and gas resources at home and abroad, the exploration and development of oil and gas continue to deepen, and the mining environment and formation conditions encountered are becoming more and more complex. Deep wells exceeding 7,000m are becoming more and more common; offshore drilling is no longer satisfied with shallow seas, and is gradually entering deep water; three-high oil and gas wells that were previously difficult to exploit on land, namely high-temperature oil and gas wells, high-pressure oil and gas wells, and high-corrosion oil and gas wells have al...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18B21D37/16B21D22/20B21C31/00B21B45/00B21B37/74
CPCC22C14/00C22F1/183B21D22/20B21C31/00B21B45/004B21B37/74B21D37/16
Inventor 冯春李睿哲朱丽娟蒋龙李宁谢俊峰刘乐冯耀荣
Owner BC P INC CHINA NAT PETROLEUM CORP
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