CN101275207B - Thermal processing method for H2S-corrosion-resistant tool joint for petroleum drill pipe - Google Patents
Thermal processing method for H2S-corrosion-resistant tool joint for petroleum drill pipe Download PDFInfo
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Abstract
The invention discloses a tool joint for petroleum drill pipe against erosion of sulfureted hydrogen and a heat treatment method thereof. The tool joint is made of the steel pipe comprising the following ingredients (wt%): C: 0.3-0.4; Si: 0.1-0.5; Mn: 0.4-1.0, Cr: 0.3-1.2, Mo: 0.4-1.0; V: 0.05-0.15; Nb: 0.04-0.1; Ti: 0.01-0.1; Cu: 0.1-0.4; Ni:0.1-0.4; P<=0.010; S<=0.005, the rests are Fe and unavoidable impurities. The heat treatment method of the tool joint comprises the steps of: heating the whole to 850-1000 DEG C and then cooling in an oil tank, after that, tempering at AC1 temperature which is over 680 DEG C and lower than the material. The invention not only guarantees the sufficient quenching of the tool for drill pipe, but also not produce quenching crack with outstanding performance resisting sulphur.
Description
Technical field
The present invention relates to a kind of high-performance hydrogen sulfide corrosion resistant tool joint for petroleum drill pipe and heat treating method thereof.
Background technology
The main processes of traditional production sulfur resistant drill pipe is: the desired size thickening is pressed at the hot rolled seamless steel tube two ends, carry out whole modified thermal treatment then, make qualified drill pipe body.The pipe material behind hot piercing, is made the tool-joint blank, carry out roughing and complete heat treatment then.Heat treated tool-joint and drill pipe body after the friction butt welding is connected, is welded and meet thermal treatment, after suitable mechanical workout is made oil drill rocker.
With regard to the tool-joint of sulfur resistant drill pipe, its thickness generally will reach 30～50mm, is much higher than body, also will have intensity and the hardness higher than body in addition, the manufacturing of therefore general employing medium carbon alloy steel.
Table 1 has been listed the 110ksi steel grade sulfur resistant drill pipe tool-joint composition of external several main drilling rod manufacturer production.
Table 1
110ksi sulfur resistant drill pipe tool-joint main component
| Producer | The trade mark | C | Mn | Cr | Mo | Nb |
| IRP | SS105 | 0.25/0.35 | ≤1.0 | 0.7/1.3 | 0.4/0.7 | |
| Grant | DP105 | 0.37 | 0.88 | 0.96 | 0.26 |
Mechanical property standard to 110ksi steel grade sulfur resistant drill pipe tool-joint has unified demand in the world, sees Table 2.The mechanical property of the 110ksi steel grade sulfur resistant drill pipe tool-joint that each manufacturer produces must satisfy this requirement.
Table 2
110ksi sulfur resistant drill pipe tool-joint mechanical property
| Yield strength ksi | Tensile strength ksi | Akv/L (room temperature, full-scale) J | δ ％ | HRC (on average) |
| 110～125 | 125～140 | ≥46 | ≥15 | ≤30 |
Because the intensity of the sulfur resistant drill pipe tool-joint that different manufacturers is produced must be in the strength range of table 2 regulation, the difference of its inner quality mainly shows the different of toughness and sulfur resistance aspect.For pursuing high toughness and excellent sulfur resistance, each producer adopts different composition designs.In order to improve the sulfur resistance of sulfur resistant drill pipe tool-joint, need to adopt to quench to increase temperature the tempered quenching-and-tempering process, and need improve tempering temperature as far as possible, to guarantee to have try one's best uniform tempered structure and lower unrelieved stress.
For guaranteeing behind high tempering still have higher intensity and toughness, need to add more alloying element, such as microalloy elements such as Mo, V, Nb, Ti.
But because the alloy content of tool-joint is higher, very easily produce quenching crack when carrying out shrend thermal treatment, generally adopt both at home and abroad at present and in pure water, add organic medium, carry out the shrend thermal treatment of drill pipe tool joint, purpose is the speed of cooling when suitably reducing shrend, avoids occurring quenching crack.
Adopt the shrend medium quenching need adjust the concentration of medium.Concentration of medium is too high, and then quenching effect is bad, and concentration is low excessively, can lose the medium effect, quenching crack occurs.In continuous flow procedure, medium can be lossy, need monitor concentration of medium at any time, brings certain difficulty to stably manufactured simultaneously.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of new H 2 S-corrosion-resistant tool joint for petroleum drill pipe and thermal treatment process thereof, both can guarantee that drilling rod was with the abundant through hardening of tool-joint, can not produce quenching crack again, can guarantee that drilling rod has excellent sulfur resistance with tool-joint simultaneously yet.
Technical scheme of the present invention is:
A kind of hydrogen sulfide corrosion resistant oil drill rocker tool-joint, it adopts the weldless steel tube with following composition to make (wt%):
C：0.30～0.40％
Si：0.1～0.5％
Mn：0.4～1.0％
Cr：0.3～1.2％
Mo：0.4～1.0％
V：0.05～0.15％
Nb：0.04～0.10％
Ti：0.01～0.10％
Cu：0.1～0.4％
Ni：0.1～0.4％
P：≤0.010％
S：≤0.005％
All the other are Fe and unavoidable impurities.
Introduce the effect of each alloying element below respectively:
C:0.30～0.40 (wt%, below each element identical), C is a carbide forming element, can improve the intensity of steel, DeGrain when too low, too Gao Shihui reduces the toughness of steel greatly.
Mn:0.4～1.0, Mn is an austenite former, can improve the hardening capacity of steel, and content is not obvious less than effect in 0.4 o'clock, and content was greater than 1.0 o'clock, and the microstructure segregation tendency increases the weight of, and can influence sulfur resistance.
Si:0.1～0.5, deoxidation when being used to make steel, content is crossed low inoperative, and content is higher than 0.5, can increase the fragility of material.
Cr:0.3～1.2, Cr is a carbide forming element, can improve the intensity and the hardening capacity of steel, DeGrain when too low, too Gao Shihui improves the hardness of steel greatly, influences sulfur resistance.
Mo:0.4～1.0: mainly be the intensity that improves steel by carbide and solution strengthening form, too high levels can reduce the toughness of steel, and too high levels then raises the cost greatly.
V:0.05～0.15 can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Nb:0.04～0.10 can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Ti:0.01～0.10 can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Cu:0.1～0.4 can the anti-hydrogen penetrating power of reinforcement material, and it is not obvious to add too low effect, adds the fragility that can increase steel too much.
Ni:0.1～0.4 cooperates Cu to add, and can improve the toughness of steel simultaneously, adds too lowly, and DeGrain adds too highly, and the effect of raising flexible is not obvious.
P :≤0.010, be easy to form abnormal structure's segregation, influence sulfur resistance.Therefore should reduce P content as far as possible.
S :≤0.005, be easy to form sulfide inclusion, have a strong impact on sulfur resistance.Therefore should reduce S content as far as possible.
The thermal treatment process of H 2 S-corrosion-resistant tool joint for petroleum drill pipe of the present invention is: roughing becomes drill pipe tool joint, be heated to 850～1000 ℃ temperature through integral body after, integral quenching cooling in oil groove is subsequently more than 680 ℃ and be lower than the Ac of material
1Temperature (the lower change point temperature of steel) tempering.Way commonly used is: adopt the weldless steel tube with above composition among the present invention, tool-joint is made in roughing, then adopts at 850～1000 ℃ of oil quenchings, 680～720 ℃ of tempered technologies tool-joint is carried out complete heat treatment after the quench cooled; With the butt welding that rubs of the tool-joint after the thermal treatment and drill pipe body, butt welded seam carries out modified thermal treatment then; The weld seam thermal treatment process is: 950～1050 ℃ of induction heating, and after the aerosol cooling, 700～750 ℃ of induction heating temperings.
Generally all adopt water quenching liquid to carry out integral quenching to the thermal treatment of drill pipe tool joint both at home and abroad at present with certain concentration of medium.The present invention adopts the oil quenching mode that drill pipe tool joint is carried out complete heat treatment.Because the speed of cooling of oil quenching mode is lower than shrend, therefore can adopt the steel of higher alloy content to make drill pipe tool joint.Because the alloy content of tool-joint is higher, in the weld seam thermal treatment of carrying out subsequently, can adopt the type of cooling slower to carry out the weld seam quench treatment, produce quenching crack because of local cooling fast, guarantee the stable of weldquality thereby avoid weld seam than conventional speed of cooling.
Beneficial effect of the present invention is as follows:
H 2 S-corrosion-resistant tool joint for petroleum drill pipe of the present invention has higher hardening capacity, can guarantee the cross section complete through hardening of oil quenching mode of the above thickness of 40mm.With adopt shrend medium mode to quench to compare, oil quenching thermal treatment process of the present invention can avoid because the difficulty that the fluctuation of shrend concentration of medium brings to stably manufactured.
The present invention both can guarantee that drilling rod with the abundant through hardening of tool-joint, can not produce quenching crack again, also can guarantee that drilling rod has excellent sulfur resistance with tool-joint simultaneously.Adopt used steel grade of tool-joint and heat treating method among the present invention, can produce the high strength H 2 S-corrosion-resistant tool joint for petroleum drill pipe that yield strength reaches the above grade of steel of 110ksi.
Embodiment
The invention will be further described below in conjunction with embodiment and comparative example.
Embodiment:
The present invention adopts the weldless steel tube that has as listed alloying constituent in the table 3 respectively, and roughing makes tool-joint 4,5,6,7, No. 8.Then adopt tool-joint integral body is heated to 850～1000 ℃ temperature after, the integral quenching cooling 680～720 ℃ of tempered technologies, is carried out complete heat treatment to the 4-8 tool-joint respectively subsequently in oil groove.
The Cr-Mo steel that Cr-Mo-V steel that the 4-8 tool-joint that the present invention is made is used and general tool joint are commonly used compares, and its chemical ingredients contrast situation sees Table 3.
The contrast of table 3 test steel chemical composition
| Numbering | C | Si | Mn | Cr | Mo | V | Nb | Ti | Remarks |
| 1 | 0.27 | 0.21 | 0.58 | 1.04 | 0.29 | 0.07 | The contrast steel grade | ||
| 2 | 0.29 | 0.19 | 1.41 | 0.94 | 0.38 | 0.08 | The contrast steel grade | ||
| 3 | 0.35 | 0.27 | 0.88 | 0.85 | 0.50 | The contrast steel grade | |||
| 4 | 0.30 | 0.36 | 1.00 | 0.98 | 1.00 | 0.08 | 0.10 | 0.08 | The present invention |
| 5 | 0.34 | 0.50 | 0.78 | 1.20 | 0.55 | 0.05 | 0.06 | 0.10 | The present invention |
| 6 | 0.37 | 0.10 | 0.85 | 0.30 | 0.86 | 0.09 | 0.04 | 0.05 | The present invention |
| 7 | 0.40 | 0.20 | 0.40 | 0.68 | 0.40 | 0.06 | 0.07 | 0.01 | The present invention |
| 8 | 0.32 | 0.30 | 0.65 | 0.88 | 0.65 | 0.10 | 0.05 | 0.03 | The present invention |
The 4-8 tool-joint that will get with steel of the present invention, with the general tool joint that makes with compared steel, all adopt the performance test data that oil quenching mode of the present invention is quenched and the finished product tool-joint that makes after the complete heat treatment is carried out in tempering to compare, its performance comparison situation sees Table 4.
Table 4 test rigidity can contrast
| Sequence number | Steel grade | Quenching temperature ℃ | Tempering temperature ℃ | Yield strength MPa | Tensile strength MPa | Anti-SSC performance |
| 1 | Compared steel | 900 | 700 | 750 | 865 | Fracture |
| 2 | Compared steel | 900 | 680 | 788 | 871 | Fracture |
| 3 | Compared steel | 900 | 680 | 766 | 835 | Fracture |
| 4 | The present invention | 920 | 720 | 820 | 910 | Well |
| 5 | The present invention | 920 | 690 | 830 | 920 | Well |
| Sequence number | Steel grade | Quenching temperature ℃ | Tempering temperature ℃ | Yield strength MPa | Tensile strength MPa | Anti-SSC performance |
| 6 | The present invention | 900 | 700 | 803 | 880 | Well |
| 7 | The present invention | 900 | 680 | 775 | 850 | Well |
| 8 | The present invention | 900 | 680 | 790 | 860 | Well |
(annotate: wherein the method A of NACE TM0177 standard is pressed in the sulfur resistance test, and sample feeds saturated hydrogen sulfide in the 5%NaCl+0.5% glacial acetic acid solution, under 80% nominal yield strength, do not rupture in continuous 720 hours, shows that then the promptly anti-SSC of anti-sulphur is functional.)
Can find out from table 4, adopt steel grade of the present invention and method can produce qualified H 2 S-corrosion-resistant tool joint for petroleum drill pipe; The drill pipe tool joint yield strength and the tensile strength of carrying out obtaining after the oil quenching thermal treatment under 920 ℃ of quenching temperatures and 690 ℃ of conditions of tempering temperature are all higher.
Comparative example:
Now the present invention is compared with the Japanese Patent of 1 relevant sulfur resistant drill pipe tool-joint, its composition relatively sees Table 5.
Table 5 Japanese Patent and steel chemical composition of the present invention are relatively
| Material | C | Si | Mn | P | S | Cr | Mo | V | Nb | Ti | |
| Japanese Patent No. JP2003166037 | Joint | 0.3 ～ 0.4 | ≤ 0.5 | 0.6 ～ 1.2 | ≤ 0.01 | ≤ 0.002 | 0.8 ～ 1.2 | 0.15 ～ 0.35 | ≤ 0.05 | ≤ 0.04 | |
| The present invention | Joint | 0.3 ～ 0.4 | 0.1 ～ 0.5 | 0.4 ～ 1.0 | ≤ 0.01 | ≤ 0.005 | 0.3 ～ 1.2 | 0.4 ～ 1.0 | 0.05 ～ 0.15 | 0.04 ～ 0.10 | 0.01 ～ 0.10 |
Can find out from table 5, compare with Japanese Patent, drill pipe tool joint of the present invention has higher Mo, and microalloy element V, Nb and Ti, hardening capacity and temper resistance that this has not only improved material can also guarantee that joint still has higher intensity and sulfur resistance after higher temperature tempering.
The thermal treatment process of Japanese Patent and tool-joint of the present invention, mechanical property and sulfur resistance contrast see Table 6.
Table 6 Japanese Patent and thermal treatment process of the present invention, mechanical property and sulfur resistance are relatively
Can find out that from table 6 Japanese Patent is because tempering temperature is lower, and intensity is higher, but sulfur resistance is relatively poor, can only be under slightly acidic environment, feed under the condition of unsaturated hydrogen sulfide and use.And the present invention can use under the most harsh sour environment of NACE TM0177 standard code, has excellent sulfur resistance.
Claims (3)
1. the heat treating method of a H 2 S-corrosion-resistant tool joint for petroleum drill pipe, described H 2 S-corrosion-resistant tool joint for petroleum drill pipe adopt the weldless steel tube with following composition to make (wt%):
C：0.30～0.40％
Si：0.1～0.5％
Mn：0.4～1.0％
Cr：0.3～1.2％
Mo：0.4～1.0％
V：0.05～0.15％
Nb：0.04～0.10％
Ti：0.01～0.10％
Cu：0.1～0.4％
Ni：0.1～0.4％
P：≤0.010％
S：≤0.005％
All the other are Fe and unavoidable impurities, it is characterized in that,
The drill pipe tool joint that roughing is made, be heated to 850～1000 ℃ temperature through integral body after, integral quenching cooling in oil groove is subsequently more than 680 ℃ and be lower than the Ac of material
1The temperature tempering.
2. the heat treating method of H 2 S-corrosion-resistant tool joint for petroleum drill pipe according to claim 1, its feature also be, the drill pipe tool joint that described roughing is made is in 850～1000 ℃ oil groove after the integral quenching cooling, 680～720 ℃ of tempering.
3. the heat treating method of H 2 S-corrosion-resistant tool joint for petroleum drill pipe according to claim 2, wherein, 920 ℃ of oil groove integral quenching temperature, 690 ℃ of tempering temperatures.
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Cited By (1)
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| WO2014169593A1 (en) * | 2013-04-19 | 2014-10-23 | 宝山钢铁股份有限公司 | Method for manufacturing super 13cr tool coupler |
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