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720mpa grade high-strength corrosion-resistant titanium alloy drill pipe and manufacturing method

A manufacturing method and high-strength technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of difficult processing, expensive alloying elements, high production costs, increase the difficulty of extrusion, increase the surface Aggregated thickness and improved corrosion resistance

Active Publication Date: 2022-07-05
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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  • 720mpa grade high-strength corrosion-resistant titanium alloy drill pipe and manufacturing method
  • 720mpa grade high-strength corrosion-resistant titanium alloy drill pipe and manufacturing method
  • 720mpa grade high-strength corrosion-resistant titanium alloy drill pipe and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0058] Step 1, prepare raw materials according to the components of the pipe, and sequentially smelt, cast and forge to obtain a round ingot. The composition of the pipe is calculated as: 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 ingot to 1000° C., holding it for 1 hour and then extruding and deforming, 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, keep it at 800°C for 1 hour for annealing treatment;

[0061] Step 4, heating the annealed pipe to 960°C, holding for 1 hour, cooling to 935°C with the furnace, holding for 1 hour, and cooling to room temperature naturally;

[0062] Step 5, after applying 1.5% pre-stretching deformation to the tr...

Embodiment 2

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

[0066] Step 1, prepare raw materials according to the components of the pipe, smelt and cast in sequence to obtain a round ingot, and the components of the pipe are calculated as: 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] In step 2, the above-mentioned round ingot is heated to 1000° C., held for 1 hour, and then extruded and deformed. The extrusion ratio of extrusion is 23, and the extrusion speed is 110 m / s to obtain a pipe;

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

[0069] Step 4, heating the annealed pipe to 965°C, holding for 1 hour, cooling to 935°C with the furnace, holding for 1 hour, and naturally cooling to room temperature;

[0070] Step 5, after applying a pre-stretching deformation of 1.8% to the treat...

Embodiment 3

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

[0078] Step 1, prepare raw materials according to the components of the pipe, and sequentially smelt, cast and forge to obtain a round ingot. The components of the pipe are calculated as: 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 ingot to 980°C, extruding and deforming after 0.8h heat preservation, the extrusion ratio of extrusion is 16, and the extrusion speed is 85m / s to obtain a pipe;

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

[0081] Step 4, the annealed pipe is heated to 950°C, kept for 1.2h, cooled to 930°C with the furnace, kept for 1.2h, and naturally cooled to room temperature;

[0082] Step 5, after applying 1% pre-stretching deformation to the treated pipe, heating to ...

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Abstract

The invention provides a pipe material for 720MPa grade high-strength corrosion-resistant titanium alloy drill pipe and a manufacturing method. The pipe material, in terms of mass percentage, comprises Al 5.5%-6%, V 1.5%-2.0%, Ru 0.1%-0.3%, C ≤0.05%, N≤0.03%, H≤0.0125% and O≤0.1%, and the balance is Ti. The manufacturing method includes step 1, preparing raw materials according to the components, smelting, casting and forging in sequence to obtain a round ingot; step 2, heating the round ingot, keeping it warm, extruding to obtain a pipe, rolling the pipe and then performing annealing treatment ; Step 3, keep the annealed pipe at 950-970°C for 0.8-1.2h, and then keep it at 930-940°C for 0.8-1.2h and then naturally cool to room temperature; Step 4, pre-stretch the pipe Carry out aging treatment.

Description

technical field [0001] The invention belongs to the technical field of oil well pipe manufacturing in the oil and natural gas industry, in particular to a pipe material for a 720MPa grade high-strength corrosion-resistant titanium alloy drill pipe and a manufacturing method. Background technique [0002] With the development of the modern petroleum industry and the increasing demand for oil and gas resources at home and abroad, the exploration and development of oil and natural gas continues to deepen, and the exploitation environment and formation conditions encountered are becoming more and more complex. Deep wells over 7000m are becoming more and more common; marine drilling is no longer satisfied with shallow seas, and is gradually entering deep water; the three-high oil and gas wells that were difficult to exploit on land in the past, namely high-temperature oil and gas wells, high-pressure oil and gas wells, and high-corrosion oil and gas wells have also begun to conque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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