CN102642071B - Preparation method of V140 steel-grade oil well pipe testing object - Google Patents
Preparation method of V140 steel-grade oil well pipe testing object Download PDFInfo
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Abstract
The invention relates to a preparation method of a V140 steel-grade oil well pipe testing object; a V140 steel-grade oil well pipe and a 35CrMo material chuck are connected by welding, electric-arc welding is selected, the equipment is a direct current welder, the polarity is in reverse connection, and a low-alloy steel low-hydrogen sodium-type welding rod and a steel coated electric welding rod for high-tensile strength are selected as welding materials; the welding temperature is 70DEG C to 100DEG C; firstly, the low-alloy steel low-hydrogen sodium-type welding rod is used for bottoming, the root is welded through, and ring welding is carried out for four to five layers uniformly; then welding is carried out by steel coating electric welding for high tensile strength, the ring welding is carried out uniformly, the total number of weld beads is no less than nine, weld seams after grooves are fully welded are provided with the strengthening heights being at least 3mm to 5mm, two weld seams are overlaid in parallel on the edges of the weld seams of a testing steel tube, and the width is about 5mm to 10mm; and according to the method, the connection problem between the steel tube and the chuck when a physical test is taken to the V140 steel-grade oil well pipe is solved, so that the physical performance evaluation safety and reliability of the oil well pipe are ensured.
Description
Technical field
The present invention relates to a kind of V140 grade of steel high-strength oil well pipe and the welding of 35CrMo class material chuck and prepare the method for test real object.
Background technology
Along with China's superelevation is dark, the exploitation of super high pressure oil gas well, high grade of steel high-strength oil well pipe demand progressively increases.The high grade of steel Superior Oil Country Tubular Goods that serviceability is good is the key that ensures oil well quality, and the oil well pipe of P110 grade of steel is widely used in oil field at present, and the oil well pipe of V140 grade of steel is also progressively designed to select.Due to high temperature, hyperbaric environment, very high to the quality requirement of pipe, it is the effective means that ensures engineering steel pipe quality that the performance of V140 steel grade oil well casing is carried out to full-scale actual loading test evaluation.
While carrying out the actual loading test evaluation of V140 steel grade oil well casing, two ends need first be connected with chuck, just can be connected on testing equipment.Have two kinds for the connected mode of pipe and chuck, one is to adopt transit joint, and another kind is welding chuck.Transit joint not only processing characteristics requires highly, and is in use prone to the inefficacies such as leakage, fracture and causes evaluation test result invalid.The mode that adopts welding chuck, can effectively address these problems, but property of welded joint need reach following requirement: (1) Seam and heat effected zone such as can not crack at the weld defect; (2) weld seam will have enough intensity, and heat affected area can not produce obviously softening in welding process; (3) will there be certain toughness and fatigue strength in Seam and heat effected zone, can not produce brittle failure and fatigue cracking.Because the intensity of V140 steel grade oil well casing is high, carbon equivalent is large, causes material weldability poor, and weld seam cold crack sensitiveness is high.In addition, chuck and V140 steel grade oil well casing have different at the aspect such as chemical composition, mechanical property, belong to foreign material welding, and this has further strengthened the difficulty of welding.The appropriate design of welding method and welding procedure specification (WPS) is difficult point and the key point that test real object is prepared welding procedure success.
Summary of the invention
The object of this invention is to provide a kind of preparation method of V140 steel grade oil well casing test real object, adopt welding manner to solve the connectivity problem of V140 steel grade oil well casing and 35CrMo class material chuck, while ensureing high temperature, high-potting and axial tension or compression test, welding point there will not be leakage or fracture, guarantee carrying out smoothly of V140 steel grade oil well casing evaluation test in kind, for selecting of V140 steel grade oil well casing provides support.
A kind of V140 steel grade oil well casing test real object preparation method of the present invention, content comprises:
(1) structure: by the oil pipe of test, bevel for welding is processed at two ends, is processed into groove and the welding of test tubing by one end of two test chucks, and other end outside or inside are processed with screw thread, are connected with testing equipment.
(2) welding equipment and material: select arc welding, equipment is DC welder, and polarity is reversal connection.Welding material selects a kind of low-alloy steel low hydrogen sodium electrode and a kind of high tensile steel to apply welding rod.
Low-alloy steel low hydrogen sodium electrode diameter is 3.2mm, and the chemical composition of its deposited metal is as follows by weight percentage: C≤0.15%, Si≤0.80%, Mn=1.00%, P≤0.035%, S≤0.035%, Mo=0.60%, iron surplus; The typical mechanical property of this welding material weld metal can reach yield strength 740MPa, tensile strength 830MPa, and 27%, 20 DEG C of Charpy impact of percentage elongation absorbs energy 70J.
It is 4mm that high tensile applies welding rod diameter with steel, the chemical composition of its deposited metal is as follows by weight percentage: C≤0.08%, Si are 040～0.75%, Mn is 1.20～1.70%, P≤0.020%, S≤0.020%, Ni are that 1.50-2.10%, Cr are that 0.20-0.40%, Mo are 0.35～0.55%, iron surplus; The typical mechanical property of this welding material weld metal can reach yield strength 730MPa, tensile strength 830MPa, and percentage elongation 24% ,-20 DEG C of Charpy impacts absorb energy 110J.
(3) before weldering, will carry out preheating to workpiece, temperature starts welding while reaching 70～110 DEG C, and between Control Welding Process road, temperature is between 70～100 DEG C; When preheating and after heat, workpiece is wanted heat penetration, otherwise it is too fast to lower the temperature because chuck is blocked up, makes weld seam or heat affected area occur crackle.
(4) first use the bottoming of low-alloy steel low hydrogen sodium electrode, through welding root, evenly 4～5 layers of boxing, then applying welding rod with high tensile steel welds, evenly boxing, total welding bead is no less than 9 roads, and after groove welding completely, weld seam will have the reinforcement height of 3～5mm.In addition, in order to improve distribution of shapes and the stress of weakness band of developmental tube heat affected area, at the parallel built-up welding 2 road weld seams in test steel pipe seam edge, width is 5～10mm approximately.
The principle that welding parameter is selected is the electric current of suitable size, and electric arc is low (arc voltage is little) as far as possible, and welding rod does not swing as far as possible, selects the speed of welding of 100～200mm/min, adopts the fast speed of welding under the good prerequisite of guarantee fusion as far as possible.The welding current of recommending is 90～120A (3.2mm) and 140～180A (4.0mm), and controls weld heat input in 0.5～1.0kJ/mm scope.
(5) after welding job completes, weld seam is heated to 200～300 DEG C of insulation 6～12h hydrogen that disappears and processes and eliminate internal stress, then use insulation material (as asbestos cloth) parcel weld seam and heat affected area, until cooling.
Through repeatedly actual loading test, especially at high temperature, high pressure, repeatedly under load test condition, welding point is intact, proof welding procedure is feasible, solve the connectivity problem of steel pipe and chuck when V140 steel grade oil well casing carries out actual loading test, ensured the safety and reliability that oil well pipe object performance is evaluated.Adopt the mode of transit joint, adopt the mode of welding chuck of the present invention can shorten the test period, increase work efficiency, reduce experimentation cost, make test there is higher reliability and success rate.This preparation technology has successfully ensured completing smoothly of the full-scale evaluation test in kind of V140 steel grade oil well casing that domestic and international many enterprises produce.
Brief description of the drawings
Fig. 1 is that structural representation is prepared in V140 steel grade oil well casing test real object welding of the present invention.
In figure, 1-tests chuck, and 2,3-weld seam, 4-oil well pipe
Detailed description of the invention
The welding of a V140 steel grade oil well casing test real object is prepared as example, and the present invention is described in further detail.
Consult Fig. 1.V140 steel grade oil well casing test real object welding preparation method of the present invention:
(1) welded specimen is prepared: test chuck 1 material is 35CrMo, and profile is ladder cylinder, and small cylinder inserts in oil well pipe 4, and its external diameter is 145mm.Oil well pipe 4 is V140 level sleeve pipes, and its external diameter is 177.80mm, and wall thickness is 12.65mm, and Specifeca tion speeification is as follows: yield strength is 1087MPa, and tensile strength is 1157MPa, and percentage elongation is that 25%, 0 DEG C of Charpy impact absorption energy is 75J.
(2) welding equipment and welding rod: select arc welding, equipment is DC welder, and polarity is reversal connection.Welding material selects a kind of low-alloy steel low hydrogen sodium electrode and a kind of high tensile steel to apply welding rod.Wherein:
The performance parameter of low-alloy steel low hydrogen sodium electrode is as follows: the chemical composition of deposited metal is respectively C≤0.10%, Si≤0.50%, Mn=1.00%, P≤0.030%, S≤0.030%, Mo=1.00%, iron surplus by weight percentage; The yield strength of welding material weld metal is 740MPa, and tensile strength is 830MPa, and percentage elongation is that 27%, 20 DEG C of Charpy impact absorption energy is 70J.
It is as follows that high tensile applies the performance parameter of welding rod with steel: the chemical composition of deposited metal is respectively that C≤0.08%, Si are 050～0.75% by weight percentage, Mn is 1.20～1.70%, P≤0.020%, S≤0.020%, Ni are that 1.50-2.10%, Cr are that 0.20-0.40%, Mo are 0.35～0.55%, iron surplus; The yield strength of welding material weld metal is 730MPa, and tensile strength is 830MPa, and percentage elongation is that 25% ,-20 DEG C of Charpy impacts absorption energy are 105J.
(3) before welding, test chuck 1 and oil well pipe 4 are carried out to preheating, temperature starts welding while reaching 90 DEG C.In welding process, control welding arc height 2mm, weld heat input is 0.8kJ/mm.
(4) adopt the low-alloy steel low hydrogen sodium electrode backing welding that diameter is 3.2mm, see weld seam 2.Evenly 4 layers of boxing, employing welding current is 100A, and speed of welding is 180mm/min, and between controlling in welding process, temperature is 90 DEG C.
Adopt the high tensile steel coating welding rod that diameter is 4.0mm to weld, see weld seam 3.Evenly 6 layers of boxing, have the reinforcement of 4mm highly, at 2 layers of the weld seam 3 parallel built-up welding in edge, every layer wide 5mm more than groove welding is completely rear.Employing welding current is 170A, and speed of welding is 150mm/min, and between controlling in welding process, temperature is 90 DEG C.
(5) after having welded, weld seam is heated to 220 DEG C of insulation 12h, then with asbestos cloth, Seam and heat effected zone is wrapped up, be cooled to room temperature.
(6) to sample stretch, combined load test and the Ultimate load test such as interior pressure, bending.In combined load test, there is not any problem in test real object weld seam; Test real object has passed through the Ultimate load test of V140 grade of steel, finally in the fracture of the position of oil well pipe 4.The sample in kind that oil well pipe 4 and test chuck 1 are prepared by welding preparation technology of the present invention is described, its weld seam position has enough intensity, can meet the evaluation test requirement in kind of V140 steel grade oil well casing completely.
Claims (1)
1. a preparation method for V140 steel grade oil well casing test real object, is characterized in that: adopt and be welded to connect V140 steel grade oil well casing and 35CrMo class material chuck, concrete welding procedure comprises:
(1) structure: by the oil pipe of test, bevel for welding is processed at two ends, is processed into groove and the welding of test tubing by one end of two test chucks, and other end outside or inside are processed with screw thread, are connected with testing equipment;
(2) welding equipment and material: select arc welding, equipment is DC welder, and polarity is reversal connection, welding material selects a kind of low-alloy steel low hydrogen sodium electrode and a kind of high tensile steel to apply welding rod;
Low-alloy steel low hydrogen sodium electrode diameter is 3.2mm, and the chemical composition of its deposited metal is as follows by weight percentage: C≤0.15%, Si≤0.80%, Mn=1.00%, P≤0.035%, S≤0.035%, Mo=0.60%, iron surplus; The typical mechanical property of this welding material weld metal can reach yield strength 740MPa, tensile strength 830MPa, and 27%, 20 DEG C of Charpy impact of percentage elongation absorbs energy 70J;
It is 4mm that high tensile applies welding rod diameter with steel, the chemical composition of its deposited metal is as follows by weight percentage: C≤0.08%, Si are 0.40～0.75%, Mn is 1.20～1.70%, P≤0.020%, S≤0.020%, Ni are that 1.50-2.10%, Cr are that 0.20-0.40%, Mo are 0.35～0.55%, iron surplus; The typical mechanical property of this welding material weld metal can reach yield strength 730MPa, tensile strength 830MPa, and percentage elongation 24% ,-20 DEG C of Charpy impacts absorb energy 110J;
(3) before weldering, workpiece is carried out to preheating, temperature starts welding while reaching 70～110 DEG C, and between Control Welding Process road, temperature is between 70～100 DEG C; When preheating and after heat, workpiece is wanted heat penetration;
(4) first use the bottoming of low-alloy steel low hydrogen sodium electrode, through welding root, evenly 4～5 layers of boxing, then applying welding rod with high tensile steel welds, evenly boxing, total welding bead is no less than 9 roads, and after groove welding completely, weld seam will have the reinforcement height of 3～5mm, at the parallel built-up welding 2 road weld seams in test steel pipe seam edge, width is 5～10mm approximately;
The principle that welding parameter is selected is the electric current of suitable size, electric arc is low, and welding rod does not swing, in the speed of welding that ensures to adopt under the good prerequisite of fusion 100～200mm/min, welding current is 90～120A or 140～180A, controls weld heat input in 0.5～1.0kJ/mm scope;
(5), after welding job completes, weld seam is heated to 200～300 DEG C of insulation 6～12h hydrogen that disappears and processes and eliminate internal stress, then with insulation material parcel weld seam and heat affected area, until cooling.
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Citations (6)
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| EP0393522A1 (en) * | 1989-04-13 | 1990-10-24 | Kawasaki Steel Corporation | Steel pipe and a method for welding thereof and pipeline resistant to carbon dioxide corrosion |
| JP2005271040A (en) * | 2004-03-25 | 2005-10-06 | Nisshin Steel Co Ltd | Stainless steel-made welded tube for oil feed pipe |
| JP2007260716A (en) * | 2006-03-28 | 2007-10-11 | Jfe Steel Kk | Method for producing ultrahigh strength welded steel pipe having excellent deformability |
| JP2008023569A (en) * | 2006-07-24 | 2008-02-07 | Jfe Steel Kk | METHOD FOR PRODUCING ULTRAHIGH-STRENGTH WELDED STEEL PIPE HAVING TENSILE STRENGTH EXCEEDING 800 MPa |
| CN101149319A (en) * | 2006-09-21 | 2008-03-26 | 中国石油天然气集团公司 | 13 Cr oil well-pipe test material object preparation method |
| CN101664846A (en) * | 2009-09-09 | 2010-03-10 | 中国石油天然气集团公司 | Method for preparing test real object for G3 alloy oil well pipe by welding |
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- 2011-02-22 CN CN201110043721.7A patent/CN102642071B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0393522A1 (en) * | 1989-04-13 | 1990-10-24 | Kawasaki Steel Corporation | Steel pipe and a method for welding thereof and pipeline resistant to carbon dioxide corrosion |
| JP2005271040A (en) * | 2004-03-25 | 2005-10-06 | Nisshin Steel Co Ltd | Stainless steel-made welded tube for oil feed pipe |
| JP2007260716A (en) * | 2006-03-28 | 2007-10-11 | Jfe Steel Kk | Method for producing ultrahigh strength welded steel pipe having excellent deformability |
| JP2008023569A (en) * | 2006-07-24 | 2008-02-07 | Jfe Steel Kk | METHOD FOR PRODUCING ULTRAHIGH-STRENGTH WELDED STEEL PIPE HAVING TENSILE STRENGTH EXCEEDING 800 MPa |
| CN101149319A (en) * | 2006-09-21 | 2008-03-26 | 中国石油天然气集团公司 | 13 Cr oil well-pipe test material object preparation method |
| CN101664846A (en) * | 2009-09-09 | 2010-03-10 | 中国石油天然气集团公司 | Method for preparing test real object for G3 alloy oil well pipe by welding |
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