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A kind of 135ksi grade titanium alloy, titanium alloy drill pipe and preparation method thereof

A titanium alloy and drill pipe technology, which is applied to drill pipe, drilling equipment, drill pipe, etc., can solve the problems of high cost and low yield strength, and achieve the effects of low cost, simple proportioning and improved plastic deformation capacity

Active Publication Date: 2022-03-01
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

[0005] The object of the present invention is to overcome the shortcomings of high cost and low yield strength of the existing 135ksi grade titanium alloy drill pipe in the above-mentioned prior art, and provide a kind of 135ksi grade titanium alloy, titanium alloy drill pipe and preparation method thereof

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  • A kind of 135ksi grade titanium alloy, titanium alloy drill pipe and preparation method thereof

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preparation example Construction

[0038] see figure 1, the preparation method of the 135ksi grade titanium alloy drill pipe of the present invention, specifically 135ksi grade ω+β dual-phase 135ksi grade titanium alloy drill pipe and its preparation method, this preparation method can effectively solve the low strength of the existing 135ksi grade titanium alloy drill pipe , There are no ultra-high steel grade pipes above 135Ksi, the production process is complex, the processing performance requirements are high, the cost is high, and it is difficult to balance strength and plastic toughness at the same time. Concrete, the preparation method of this 135ksi grade titanium alloy drill rod comprises the following steps:

[0039] S1: Select titanium, manganese and titanium-tungsten master alloy; wherein, by weight percentage, tungsten: 21.0% to 25.0%, Mn: 3.0% to 5.0%, and the rest is titanium and unavoidable impurities; titanium, manganese and titanium The tungsten master alloy is smelted to obtain the tube blan...

Embodiment 1

[0051] 1. Ingredients: According to the composition of Ti-21.0wt%W-3.0wt%Mn alloy, zero-grade sponge Ti, pure Mn and Ti-31.0wt%W master alloy are prepared respectively; the purity of the above metals is ≥99.99%.

[0052] 2. Melting: Vacuum suspension casting method is used to melt titanium, manganese and titanium-tungsten master alloy. During smelting, control the vacuum degree in the furnace to ≤10 -2 Pa, the furnace temperature is 1600°C, and the tube blank is obtained. After the tube blank is fully cooled, the tube blank is peeled to remove the oxide layer on the surface.

[0053] 3. Annealing treatment: the tube billet is annealed in a box-type resistance furnace, the annealing temperature is 870°C, the holding time is 2h, and the cooling method is air cooling.

[0054] 4. Extrusion treatment: Extrude the annealed tube billet at an extrusion temperature of 960° C., an extrusion ratio of 17, and an extrusion speed of 50 mm / s to obtain a formed pipe.

[0055] 5. Solution ...

Embodiment 2

[0058] 1. Ingredients: According to the composition of Ti-23.0wt%W-4.0wt%Mn alloy, zero-grade sponge Ti, pure Mn and Ti-31.0wt%W master alloy are prepared respectively; the purity of the above metals is ≥99.99%.

[0059] 2. Melting: Vacuum suspension casting method is used to melt titanium, manganese and titanium-tungsten master alloy. During smelting, control the vacuum degree in the furnace to ≤10 -2 Pa, the furnace temperature is 1600°C, and the tube blank is obtained. After the tube blank is fully cooled, the tube blank is peeled to remove the oxide layer on the surface.

[0060] 3. Annealing treatment: the tube billet is annealed in a box-type resistance furnace, the annealing temperature is 880°C, the holding time is 2.6h, and the cooling method is air cooling.

[0061] 4. Extrusion treatment: Extrude the annealed tube billet at an extrusion temperature of 970° C., an extrusion ratio of 19, and an extrusion speed of 56 mm / s to obtain a formed pipe.

[0062] 5. Solutio...

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Abstract

The invention belongs to the technical field of oil pipe preparation, and discloses a 135ksi-grade titanium alloy, a 135ksi-grade titanium alloy drill pipe and a preparation method thereof, which include, by weight percentage: tungsten: 21.0% to 25.0%, Mn: 3.0% to 5.0% %, the rest is titanium and unavoidable impurities. The preparation method includes: selecting titanium, manganese and titanium-tungsten master alloy; melting titanium, manganese and titanium-tungsten master alloy to obtain a tube blank; Extrusion molding is carried out at 960-990°C, the extrusion ratio is 17-21, and the extrusion speed is 50-60mm / s to obtain a formed pipe; the formed pipe is subjected to solution treatment, and the solution treatment temperature is 960-970°C. The treatment time is 2-3 hours; then aging treatment is carried out, the aging treatment temperature is 360-380°C, and the aging treatment time is 2-3 hours; the tensile deformation of the formed pipe after the aging treatment is preset by a percentage. The cost is 9%-11% lower than that of the existing 135ksi grade titanium alloy with the same level of performance index, the comprehensive performance of the product is improved, and the flexible thermal processing production process can be adopted to improve the production efficiency and yield.

Description

technical field [0001] The invention belongs to the technical field of oil pipe preparation, and relates to a 135ksi grade titanium alloy, a titanium alloy drill pipe and a preparation method thereof. Background technique [0002] At present, global oil and gas exploration and development are developing from shallow mining to deep and ultra-deep mining. The deepest wells in the world can reach 12289m vertically, 11739m horizontally, and 3400m deepwater wells, making drilling more and more difficult. In addition, at high temperature and pressure, high Cl-, CO 2 and H 2 Under harsh working conditions such as S content and high erosion, oil pipe failure accidents occur from time to time. Because the titanium alloy drill pipe has excellent characteristics such as high specific strength, fatigue resistance, corrosion resistance, and non-magnetic properties, it can significantly reduce the weight of the drill string in deep and ultra-deep well operations, relieve stress concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22C14/00C22C1/03C21D9/08C21D1/26C22F1/183E21B17/00
Inventor 蒋龙冯春韩礼红刘永刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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