CN103131897B - 110ksi-level titanium alloy oil well pipe and production method thereof - Google Patents

110ksi-level titanium alloy oil well pipe and production method thereof Download PDF

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Publication number
CN103131897B
CN103131897B CN201310085898.2A CN201310085898A CN103131897B CN 103131897 B CN103131897 B CN 103131897B CN 201310085898 A CN201310085898 A CN 201310085898A CN 103131897 B CN103131897 B CN 103131897B
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titanium alloy
oil well
well pipe
alloy oil
110ksi
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CN103131897A (en
Inventor
李强
谢志浩
孙开明
张旦天
张超
李毅
孙宇
胡伟民
梁海泉
张传友
李群
宋德军
张冰
王惠斌
刘家泳
杨永昌
赵苏娟
王鹏
丁炜
汪尧
张志远
孙徕博
穆瑞三
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Tianjin Steel Tube Manufacturing Co., Ltd.
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Tianjin Pipe Group Corp
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Abstract

The invention provides a 110ksi-level titanium alloy oil well pipe and a production method thereof. The 110ksi-level titanium alloy oil well pipe comprises the following components by mass percent: 3.2% of Nb, 1.9% of Zr, 0.9% of Mo, 1.2% of Cr and the balance of Ti. The production method comprises the following steps of: smelting twice in a vacuum furnace, forging and scalping for many times to form a round blank, heating in an annular furnace to 980-1040 DEG C, and perforating and continuously rolling to obtain a titanium alloy seamless pipe, insulating for 1-1.5 hours at 960-990 DEG C, and then carrying out thermal treatment. The yield strength of the thermally treated titanium alloy oil well pipe conforms to the requirement of 110ksi level of API standard, the ballistic work is greater than 41J, the pipe can be applied to a rigorous corrosion environment with H2S partial pressure of 5Mpa, CO2 partial pressure of 11Mpa, NaCl concentration of 100000ppmCl and the elemental sulfur of 3g/L, and meets the requirement of an oil field in the corrosion environment. The 110ksi-level titanium alloy oil well pipe and the production method thereof have the effect that the yield strength of the titanium alloy oil well pipe conforms to requirement of the 110ksi level of the API standard, has excellent physical and chemical property, operational performance, hydrogen sulfide and carbon dioxide corrosion resistance, and the hydrogen sulfide stress corrosion resisting threshold value reaches 100%SMYS.

Description

110ksi level titanium alloy oil well pipe and production method thereof
Technical field
The present invention relates to a kind of 110ksi level titanium alloy oil well pipe and production method thereof, this titanium alloy oil well pipe has good anti-H 2 S and carbon dioxide corrosion performance.
Prior art
Along with the degree of depth of oil mining constantly increases, the temperature and pressure of fluid raises, and sulphur content increases, more strict for material and the technical requirements of oil well pipe.Anti-corrosion nickel-base alloy is widely used on the oil well of petroleum prospecting and working conditions harshness, but in the sour environment of comparatively high temps sulfur-bearing, corrosion resisting property can not be satisfactory for it, and in deep-well, uses this alloy, and weight is also aobvious too heavy.Titanium alloy has high specific strength, high ratio modulus, the series of advantages such as corrosion-resistant, and its effect and advantage are more and more obvious.Therefore, exploitation titanium alloy oil well pipe and production technique thereof become a much-needed technical problem.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of 110ksi level titanium alloy oil well pipe and production method thereof, the titanium alloy oil well pipe of production can ensure within the scope of its yield strength 110ksi and have good anti-H 2s, CO 2the performance of stress corrosion.
To achieve these goals, technical scheme of the present invention is a kind of 110ksi level titanium alloy oil well pipe, wherein: the composition of this titanium alloy oil well pipe is by weight percentage: Ti surplus, Nb:3.2%, Zr:1.9%, Mo:0.9%, Cr:1.2%.
Simultaneously by a kind of production method of 110ksi level titanium alloy oil well pipe.
Effect of the present invention is the titanium alloy oil well pipe that adopts the method to produce, the finished product yield strength meets the requirement of API standard 110ksi level, and have the performance of good physicochemical property, use properties, anti-H 2 S and carbon dioxide corrosion, its anti-H 2 S stress stress corrosion threshold value reaches 100%SMYS(name SMYS).
Brief description of the drawings
Fig. 1 is the metallographic structure of titanium alloy oil well pipe of the present invention.
Embodiment
Below in conjunction with embodiment, 110ksi level titanium alloy oil well pipe of the present invention and production method thereof are described further, but are not limited to limiting the scope of the invention.
The present invention is based on following technological thought draws: (1) titanium alloy has the performance of good anti-H 2 S and carbonic acid gas stress corrosion, is suitable for the oil well pipe of the sour environment of comparatively high temps sulfur-bearing; (2) titanium alloy has high specific strength, density is low, lighter for deep-well quality.(3) chemical composition of titanium alloy and final metallographic structure are very large for final performance impact.
The composition of 110ksi level titanium alloy oil well pipe of the present invention is by weight percentage: Ti surplus, Nb:3.2%, Zr:1.9%, Mo:0.9%, Cr:1.2%.
The production method of 110ksi level titanium alloy oil well pipe of the present invention includes following steps:
(1) smelt: select titanium sponge, according to Ti surplus, Nb:3.2%, Zr:1.9%, Mo:0.9%, the proportion ingredient of Cr:1.2%, adopts the melting of secondary vacuum consumable electroarc furnace, causes blank through 5~8 draw-press forgings, strips off the skin and makes circular pipe blank;
(2) rolling: described circular pipe blank is heated in ring furnace, and furnace temperature is set as 980-1040 DEG C, insulation 50-80min, to ensure that temperature is even, then makes tubing by described circular pipe blank through Mannesmann piercing and tandem rolling;
(3) thermal treatment: Heating temperature 960-990 DEG C, insulation 1-1.5h, air cooling.
The technical indicator that titanium alloy oil well pipe of the present invention reaches is:
Yield strength > 758MPa
Tensile strength > 862MPa
Unit elongation > 11%
Ballistic work > 40J;
Titanium alloy oil well pipe after final thermal treatment is at H 2s dividing potential drop: 5Mpa; CO 2dividing potential drop: 11Mpa; NaCl concentration: 100000ppmCl; In the harsh corrosive environment of elemental sulfur: 3g/L, use, meet the oil field demand of corrosive environment.
110ksi level titanium alloy oil well pipe production method of the present invention comprises first adopting according to proportioning titanium sponge is smelted into titanium alloy through secondary vacuum smelting furnace, then cause blank through 5~8 draw-press forgings, strip off the skin and make circular pipe blank, then circular pipe blank is made to tubing through Mannesmann piercing and tandem rolling, last tubing is made finished product through Overheating Treatment.Refining titanium alloy adopts vacuum consumable electrode arc furnace melting, even for ensureing composition, adopts twice melting, through repeatedly forging and strip off the skin into circular pipe blank; Tube rolling, for first adopting rotary heating furnace that circular pipe blank is heated, then adopts two roller cross piercings, tube rolling mill rolling and 14 sizing mill tube reducings; It is that 950-980 DEG C, soaking time are 1h-1.5h that Final Heat Treatment Process adopts Heating temperature.
In actual production, can adopt following steps:
(1) smelt: select titanium sponge, according to Ti surplus, Nb:3.2%, Zr:1.9%, Mo:0.9%, the proportion ingredient of Cr:1.2%, adopts the melting of secondary vacuum consumable electroarc furnace, after repeatedly forging, strips off the skin and makes circular pipe blank;
(2) tube rolling: pipe is heated in ring furnace, and furnace temperature is set as 980-1040 DEG C, insulation 50-80min, even to reach temperature.Come out of the stove and obtain hollow billet through the perforation of Mannesmann piercing machine, after high-pressure water descaling, entering five frame three-roller continuous rolling mill rollings is hollow forging, then through 14 frame sizing mill tube reducings, then cooling on cold bed.
(3) thermal treatment: final tubing is heat-treated after non-destructive test(ing)(NDT), Heating temperature is that 960-990 DEG C, soaking time are 1h-1.5h.
Embodiment
(1) smelt: raw material adopts titanium sponge, according to Ti surplus, Nb:3.2%, Zr:1.9%, Mo:0.9%, the proportion ingredient of Cr:1.2%, adopt the melting of secondary vacuum consumable electroarc furnace, cause blank through 5~8 draw-press forgings, after strip off the skin and make Ф 210mm circular pipe blank.
(2) rolling: described pipe is heated in ring furnace, and furnace temperature is set as 990 DEG C, insulation 60min is to ensure that temperature is even.Come out of the stove and obtain hollow billet through the perforation of Mannesmann piercing machine, after high-pressure water descaling, entering five frame three-roller continuous rolling mill rollings is hollow forging, is then Ф 88.9 × 7.34mm seamless tube through 14 frame sizing mill tube reducings, then cooling on cold bed.
(3) thermal treatment: final tubing is heat-treated after non-destructive test(ing)(NDT), 960 DEG C of Heating temperatures, soaking time is 1h, air cooling.
By thermal treatment process, the finished product yield strength meets the requirement of API standard 110ksi level.Mechanical property: yield strength >758Mpa, impelling strength >45J, unit elongation >11%, specific performance is shown in Table 1.
Titanium alloy oil well pipe of the present invention is at H 2s dividing potential drop: 5Mpa, CO 2dividing potential drop: 11Mpa, NaCl concentration: 100000ppmCl, under the harsh corrosive environment of elemental sulfur: 3g/L, carries out anti-H 2 S stress corrosion test according to NACE TM0177A method respectively; According to NACE TM0177B method ASTM G39 standard, adopt four-point bending sample, carry out anti-H 2 S stress corrosion test; Carry out C ring test according to program given in NACE TM177-2005 and ASTM G38-01, sample all passes through.Corrosion coupon carries out after 168 hours corrosion tests, and its erosion rate is 0.0020mm/a.Show that example titanium alloy oil well pipe of the present invention has good anti-CO 2, H 2s stress corrosion performance.
Table 1 example 1 mechanical property

Claims (3)

1. a 110ksi level titanium alloy oil well pipe, is characterized in that: the composition of this titanium alloy oil well pipe is by weight percentage: Ti surplus, Nb:3.2%, Zr:1.9%, Mo:0.9%, Cr:1.2%.
2. according to the production method of the 110ksi level titanium alloy oil well pipe of claim 1, the method includes following steps:
(1) smelt: select titanium sponge, by the composition proportion preparation raw material of the 110ksi level titanium alloy oil well pipe of claim 1, adopt the melting of secondary vacuum consumable electroarc furnace, cause blank through 5~8 draw-press forgings, strip off the skin and make circular pipe blank;
(2) rolling: described circular pipe blank is heated in ring furnace, and furnace temperature is set as 980-1040 DEG C, insulation 50-80min, to ensure that temperature is even, then makes tubing by described circular pipe blank through Mannesmann piercing and tandem rolling;
(3) thermal treatment: Heating temperature 960-990 DEG C, insulation 1-1.5h, air cooling.
3. 110ksi level titanium alloy oil well pipe according to claim 1, is characterized in that: the technical indicator that described titanium alloy oil well pipe reaches is:
Yield strength > 758MPa
Tensile strength > 862MPa
Unit elongation > 11%
Ballistic work > 40J;
Titanium alloy oil well pipe after final thermal treatment is at H 2s dividing potential drop: 5Mpa; CO 2dividing potential drop: 11Mpa; NaCl concentration: 100000ppmCl; In the harsh corrosive environment of elemental sulfur: 3g/L, use, meet the oil field demand of corrosive environment.
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CN103341491B (en) * 2013-07-11 2015-05-20 天津钢管集团股份有限公司 Method for manufacturing titanium alloy oil well pipe with medium thick wall
CN103394868B (en) * 2013-07-11 2016-05-04 天津钢管集团股份有限公司 A kind of manufacture method of titanium alloy hoop material
CN104422648B (en) * 2013-08-30 2018-01-30 宝山钢铁股份有限公司 A kind of oil well pipe material deposition sulfur corrosion test method and its test fixture
CN103909112B (en) * 2014-03-31 2015-12-02 攀钢集团成都钢钒有限公司 110ksi level titanium alloy oil pipe and production method thereof
CN104404299B (en) * 2014-11-21 2016-10-12 宝鸡石油钢管有限责任公司 A kind of titanium alloy coiled tubing and manufacture method
CN106269981A (en) * 2016-09-22 2017-01-04 天津钢管集团股份有限公司 It is applicable to the production method of the titanium alloy seamless pipe of drilling rod material
CN107199243B (en) * 2017-07-18 2018-10-02 攀钢集团研究院有限公司 The production method of heavy caliber titanium seamless tubes
CN115854125B (en) * 2023-01-05 2024-09-10 天津大学 Titanium alloy seamless pipe for oil/gas transportation in severe corrosion environment

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CN101886191A (en) * 2010-07-14 2010-11-17 南京信息工程大学 Corrosion-resistant and abrasion-resistant titanium alloy and preparation method thereof
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