CN101117683A - High-performance hydrogen sulfide corrosion resistant oil drill rocker and its heat treatment process - Google Patents
High-performance hydrogen sulfide corrosion resistant oil drill rocker and its heat treatment process Download PDFInfo
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Abstract
The present invention relates to a high-performance hydrogen sulfide corrosion resistant petroleum drill pipe with a weight percentage of components as follows: C 0.20-0.32 percent, Si 0.1-0.5 percent, Mn 1.0-1.5 percent, Cr 0.5-1.5 percent, Mo 0.8-1.2 percent, P less than or equal to 0.015 percent, S less than or equal to 0.01 percent and the remainders are Fe and unavoidable impurities. The drill pipe of the present invention has a higher content of Mn, which can guarantee an upset end with a thickness of over 30mms to be fully hardened, thereby guaranteeing the sulfur-resistant performance of the upset end. The drill pipe of the present invention has a higher content of Mo, which can improve the backfire-preventive stability of the material, thereby raising the backfire temperature, reducing the residual stress and guaranteeing the sulfur-resistant performance. Simultaneously, the invention can make the pipe body with a different wall thickness and the upset end have the same cooling speed by controlling the outer water injection of the upset end and pipe body of the steel pipe, reducing the water injection outside the pipe body or increasing the water injection outside the upset end of the drill pipe, to ensure that the pipe body and the upset end have the same quenching structure, and the same mechanical property can be achieved after the backfire.
Description
Technical field
The present invention relates to a kind of hydrogen sulfide corrosion resistant oil drill rocker and thermal treatment process thereof, the hydrogen sulfide corrosion resistant oil drill rocker that adopts the designed thermal treatment process of the present invention to process, its yield strength reaches the above grade of steel of 105ksi.
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.Heat treated tool-joint and drill pipe body after the friction butt welding is connected, are carried out weld seam thermal treatment again, after suitable mechanical workout is made oil drill rocker.
For drill pipe body, in order to guarantee and the intensity of tool-joint to postwelding that must carry out the jumping-up thickening to pipe end and weld with tool-joint, the drilling rod grade of steel is high more, upset end is just thick more.Body need carry out complete heat treatment before the pistol joint, to guarantee use properties.But, much thicker that martensite volume after the upset end quenching might be lower than body than body under identical quenchant and speed of cooling because the thickness of body and upset end exists than big-difference, thus have influence on the sulfur resistance of drilling rod.In order to address this problem, the drilling rod manufacturers and the investigator of countries in the world have done big quantity research and improvement, and its main direction of studying is to improve thermal treatment process and the new steel grade of design.
The producer that produces oil drill rocker at present both at home and abroad all adopts in tank the heat treated mode of the whole shrend of drilling rod is carried out quench treatment, because the water temperature in the tank is basic identical, cooling power is also basic identical.For pipe end and body wall thickness differ bigger drilling rod, pipe end is thick more, pipe end is just slow more with respect to the speed of cooling of body, quenching hardness is just low more, like this, generally than body about low about 50MPa, in the time of seriously even can hang down more than the 100MPa, always be lower than body through the intensity of drill pipe thickening end behind the Q-tempering through the drill rod pipe end hardness of Q-tempering.For improving the quenching hardness of pipe end, need to improve the hardening capacity of material, but after material hardening capacity increased, thin body just there was the possibility of hardening crack.Therefore adopt moderate Cr-Mo steel of hardening capacity or Mn-Mo steel to make high-strength drill pipe in the world usually, but the tissue of its upset end and sulfur resistance then might not satisfy the requirement of high anti-sulphur.
With regard to sulfur resistant drill pipe body steel grade, for the heat treated steel grade of suitable shrend, be performance and the service requirements that reaches the 105ksi grade of steel, low-carbon alloy steel manufacturing in general the employing.
Table 1 has been listed the main component of two kinds of external existing 105ksi steel grade sulfur resistant drill pipe bodys.
Table 1 unit: wt%
| Producer | The trade mark | C | Mn | Cr | Mo | Nb | Ti | B |
| IRP | SS105 | 0.25/0.35 | ≤1.0 | 0.9/1.3 | 0.3/0.6 | |||
| Grant | DP105 | 0.245 | 0.57 | 0.83 | 0.51 | 0.025 | 0.015 | 0.002 |
Wherein, trade mark SS105 is that reel number is Canadian industrial recommendation method (IndustryRecommended Practice is called for short IRP) institute's recommended products of 1-2004.Grant is global maximum drilling rod manufacturer Glan spy, and table 1 ingredients listed is the product measured value.
Concerning the design of sulfur resistant drill pipe body steel grade, mainly be to guarantee enough hardening capacity and sulfur resistance.C, Mn, Cr, B are the principal elements that improves material hardening capacity, and Mo, Nb, Ti are the principal elements that improves obdurability.C, Mn, the compound adding of Cr can effectively improve the hardening capacity of steel.Saturating for guaranteeing the drill pipe thickening end quenching, should add higher C, Mn, Cr, but because body is thinner, the too high then easy hardening crack of hardening capacity should suitably reduce hardening capacity again for this reason.Reducing the problem that hardening capacity brings is, the drill pipe thickening end hardening martensite quantity that 30mm is thick reduces, and the homogeneity of tempered structure reduces, and has a strong impact on the pipe end sulfur resistance.Therefore, as can be seen from the above table, be the product of SS105 for the trade mark in the table 1, low excessively by Mn content, make the hardening capacity of this product obviously not enough; Mo content is low has simultaneously caused temper resistance bad, has finally influenced anti-sulphur.And be the product of DP105 for the trade mark of Glan spy in the table 1, the content of Mn and Mo is all higher, though hardening capacity is very good, sulfur resistance might as well, under the situation of upset end through hardening, body is easy to occur crackle.
Summary of the invention
Main purpose of the present invention provides a kind of high-performance hydrogen sulfide corrosion resistant oil drill rocker and thermal treatment process thereof, both can guarantee the abundant through hardening of drill pipe body and upset end, can not produce quenching crack again.Can guarantee also simultaneously that drilling rod integral body comprises that upset end has excellent sulfur resistance.
For achieving the above object, the present invention at first provides a kind of high-performance hydrogen sulfide corrosion resistant oil drill rocker, and its composition weight percent is:
C:0.20～0.32; Si:0.1～0.5; Mn.1.0～1.5; Cr:0.5～1.5; Mo:0.8～1.2; Ca:0.002～0.02; P :≤0.015; S :≤0.01; All the other are Fe and inevitable impurity.
Or on the basis of mentioned component, add: V:0.01～0.10; Nb:0.01～0.05; In Ti:0.01～0.05 one or both.
Preferably, mentioned component Ca/S 〉=1.
Below be the effect and the qualification explanation thereof of principal element of the present invention:
C:0.20～0.32 (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, and might produce quenching crack.
Mn:1.0～1.5, Mn is an austenite former, by the stable austenite tissue, postpones in the high temperature cooling process austenite to the transformation of ferrite and bainite, thereby obtains more quenched martensite, improves the hardening capacity of steel.Mn content is not obvious less than the effect that improved hardening capacity at 1.0 o'clock, if the Mn too high levels, then austenite is too stable, can increase the remained austenite content after the quenching, influences sulfur resistance.
Cr:0.5～1.5, 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:0.8～1.2: mainly be intensity and the temper resistance that improves steel by carbide precipitation strength and solution strengthening form.The carbide particle of Mo is tiny, can not cause the stress concentration of heterogeneous microstructure, helps improving sulfur resistance.Higher Mo content also can be solid-solubilized in the matrix by some unnecessary Mo at the carbide that forms Mo simultaneously, improves the temper resistance of steel with the form of solution strengthening.The raising of temper resistance helps improving tempering temperature, thereby reduces the unrelieved stress after the thermal treatment, improves sulfur resistance.Too high levels then raises the cost greatly.
V: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.
Ti:0.01～0.05 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:0.01～0.05 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.
Si:0.1～0.5, for improving the element that casting properties must add, too high levels can increase the fragility of steel.
Ca:0.002～0.02, the spherical CaS of the preferential generation of the S in Ca and the steel is mingled with, and can effectively avoid producing strip MnS and be mingled with, and makes inclusion balling, avoids because the stress concentration that the wedge angle of inclusion causes improves sulfur resistance.Ca/S 〉=1 can make the S in the steel combine with Ca fully basically, reduces the quantity of MnS.
S :≤0.015, add-on surpasses can increase sulfide content, influences the anti-sulphur ability of steel.
P :≤0.01, add-on surpasses can increase microsegregation, influences the anti-sulphur ability of steel.
For achieving the above object, the present invention also provides a kind of thermal treatment process of high-performance hydrogen sulfide corrosion resistant oil drill rocker, and specific embodiment is as follows:
At first carry out end upsetting and handle, make the body of thickening drilling rod, be heated to 900～1000 ℃ temperature through integral body after, be positioned on the spin hardening stand, in the steel pipe rotation, carry out the cooling of drilling rod internal surface axial flow water spray, the cooling of drilling rod outside surface laminar flow water spray.Different with common outer surface of steel tube laminar flow cooling is, can adjust along the cooling water inflow on the steel pipe total length direction, identical with the speed of cooling that reaches upset end and body, by the outer injection flow rate at minimizing body place or the outer injection flow rate control drill pipe thickening end outer injection flow rate different at increasing drill pipe thickening end place with body, make the body of different wall have identical speed of cooling with upset end, guaranteeing that body has identical quenching structure with upset end, obtain identical mechanical property after tempered.
The present invention compared with prior art has the following advantages:
Drill pipe body of the present invention has higher Mn, can guarantee the hardening capacity of body upset end, can guarantee the upset end through hardening fully of the above thickness of 30mm, thereby guarantees the sulfur resistance of upset end; Drilling rod of the present invention has higher Mo, can improve the anti-temper resistance of material, thereby improves tempering temperature, reduces unrelieved stress, guarantees sulfur resistance.Simultaneously, the thermal treatment process that the present invention adopts can be adjusted body has different cooling poweies with upset end, guarantee that by the hardening capacity that improves material upset end fully quenches, for prevent high-hardenability than light wall pipe body hardening crack, can reduce the cooling water inflow of body portion or the cooling water inflow of increasing upset end, make body and upset end have identical speed of cooling, finally reach body and have identical quenching structure and hardness with pipe end (upset end), thereby body and upset end all can obtain the quenched martensite tissue more than 90% after can guaranteeing to quench, and guarantee the sulfur resistance of drill pipe body.
Embodiment
Below be specifying of embodiment of the invention 1-7.
Embodiment 1
(Wt%) is as follows for the drilling rod chemical ingredients: Ca:0.01; C:0.29; Si:0.16; Mn:1.15; P:0.007; S:0.005; Cr:0.98; Mo:0.84;
At first carry out end upsetting and handle, make the body of thickening drilling rod, be heated to 920 ℃ temperature through integral body after, be positioned on the spin hardening stand, in the steel pipe rotation, carry out the cooling of drilling rod internal surface axial flow water spray, the cooling of drilling rod outside surface laminar flow water spray.By the outer injection flow rate at minimizing body place or the outer injection flow rate control drill pipe thickening end outer injection flow rate different at increasing drill pipe thickening end place with body, make the body of different wall have identical speed of cooling with upset end, guaranteeing that body has identical quenching structure with upset end, obtain identical mechanical property after tempered.
Embodiment 2
(Wt%) is as follows for the drilling rod chemical ingredients: Ca:0.015; C:0.20; Si:0.28; Mn:1.0; P:0.010; S:0.01; Cr:1.5; Mo:1.20; V:0.1; Ti:0.05
At first carry out end upsetting and handle, make the body of thickening drilling rod, be heated to 900 ℃ temperature through integral body after, be positioned on the spin hardening stand, in the steel pipe rotation, carry out the cooling of drilling rod internal surface axial flow water spray, the cooling of drilling rod outside surface laminar flow water spray.By the outer injection flow rate at minimizing body place or the outer injection flow rate control drill pipe thickening end outer injection flow rate different at increasing drill pipe thickening end place with body, make the body of different wall have identical speed of cooling with upset end, guaranteeing that body has identical quenching structure with upset end, obtain identical mechanical property after tempered.
The chemical ingredients of embodiment 3-7 and Heating temperature and quenching, tempering temperature are tired no longer one by one to be stated, and its concrete chemical ingredients (Wt%) sees Table 2, and the performance after heat-treatment quenching method quenching and the tempering sees Table 3.
Table 2 unit: wt%
| Numbering | Ca | C | Si | Mn | P | S | Cr | Mo | V | Ti | Nd |
| 1 | 0.01 | 0.29 | 0.16 | 1.15 | 0.007 | 0.005 | 0.98 | 0.84 |
| 2 | 0.015 | 0.20 | 0.28 | 1.0 | 0.010 | 0.01 | 1.5 | 1.20 | 0.1 | 0.05 | |
| 3 | 0.02 | 0.27 | 0.31 | 1.23 | 0.012 | 0.015 | 0.96 | 0.95 | 0.01 | 0.025 | |
| 4 | 0.008 | 0.29 | 0.10 | 1.42 | 0.015 | 0.002 | 0.88 | 1.00 | 0.01 | 0.05 | |
| 5 | 0.005 | 0.25 | 0.40 | 1.11 | 0.009 | 0.003 | 1.34 | 1.14 | 0.08 | ||
| 6 | 0.002 | 0.31 | 0.20 | 1.5 | 0.013 | 0.001 | 0.5 | 0.92 | 0.05 | 0.01 | |
| 7 | 0.01 | 0.32 | 0.50 | 1.31 | 0.007 | 0.006 | 0.6 | 0.80 |
Table 3
| Numbering | Heating temperature | Quenching temperature ℃ | Tempering temperature ℃ | Yield strength MPa | Tensile strength MPa | Anti-SSC performance |
| 1 | 920 | 890 | 700 | 803 | 880 | Well |
| 2 | 900 | 880 | 680 | 775 | 850 | Well |
| 3 | 950 | 900 | 680 | 790 | 860 | Well |
| 4 | 980 | 940 | 670 | 780 | 840 | Well |
| 5 | 920 | 890 | 690 | 770 | 840 | Well |
| 6 | 1000 | 950 | 710 | 820 | 910 | Well |
| 7 | 960 | 920 | 690 | 815 | 900 | Well |
Claims (5)
1. high-performance hydrogen sulfide corrosion resistant oil drill rocker, it is characterized in that: its composition weight percent is:
C：0.20～0.32；
Si：0.1～0.5；
Mn：1.0～1.5；
Cr：0.5～1.5；
Mo：0.8～1.2；
Ca：0.002～0.02；
P：≤0.015；
S：≤0.01；
All the other are Fe and inevitable impurity.
2. high-performance hydrogen sulfide corrosion resistant oil drill rocker according to claim 1 is characterized in that: also comprise one or both following compositions, its weight percent is:
V：0.01～0.10；
Nb：0.01～0.05；
Ti：0.01～0.05。
3. high-performance hydrogen sulfide corrosion resistant oil drill rocker according to claim 1 is characterized in that: wherein, and Ca/S 〉=1.
4. the thermal treatment process of high-performance hydrogen sulfide corrosion resistant oil drill rocker according to claim 1, it is characterized in that, comprising the steps: at first to carry out end upsetting handles, make the body of thickening drilling rod, be heated to 900～1000 ℃ temperature through integral body after, carry out cooling of drilling rod internal surface axial flow water spray and the cooling of drilling rod outside surface laminar flow water spray, and, make the body of different wall have identical speed of cooling with upset end by the outer injection flow rate at minimizing body place or the outer injection flow rate at increasing drill pipe thickening end place.
5. the thermal treatment process of high-performance hydrogen sulfide corrosion resistant oil drill rocker according to claim 4 is characterized in that, when drilling rod internal surface and outside surface were cooled off, its quenching temperature was controlled to be 880～950 ℃; Tempering temperature is controlled to be 670～710 ℃.
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