Steel for straight welding petroleum casing pipe with steel grades of N80, P110 and L80 and manufacture of casing pipe

A technology of oil casing and straight seam, which is applied in the field of steel coil casing and processing for high-frequency high-frequency straight seam welding oil layer casing, which can solve the problems of affecting the quality and efficiency of oil field drilling and production, low impact toughness, and anti-collapsing Low destructive ability and other issues, to achieve the effect of broad market application prospects, low cost, and excellent talents

Inactive Publication Date: 2010-02-10
华锐石油钢管有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Oil field drilling casings are basically seamless oil casings, which have disadvantages such as large wall thickness deviation, uneven performance, low collapse resistance, low impact toughness, perforation cracking, and rapid casing damage in oil production. , seriously affecting the quality and efficiency of oilfield drilling and production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The chemical composition content (weight percent) of the steel in this example is C: 0.16, Si: 0.20, Mn: 1.5, P: 0.06, S: 0.008, Cr: 0.4, Nb: 0.14, V: 0.08, Ti: 0.16 and the rest are Fe and unavoidable impurities.

[0016] The molten steel is smelted in a converter and continuously cast into slabs. After the slab is heated at 1220°C±10°C, it is rolled into a strip. The final rolling temperature of the strip is 860°C. Within 15 seconds after rolling, the steel plate is rapidly cooled to 750°C for coiling, and the yield strength Rp0. 2 is a coil with 650MPa, tensile strength Rm of 730MPa, and elongation A50.8mm% of 34.0. The coil then enters the continuous forming process, followed by high-frequency induction welding (HFW) under the conditions of high-frequency welding power of 330KW, high-frequency welding speed of 14m / min, and extrusion amount of 1.5mm. Then heat and hold at 890°C for 35 minutes, then water-cool, and then heat and hold at 580°C for 90 minutes, then te...

Embodiment 2

[0018] The chemical composition content (percentage by weight) of the steel in this example is C: 0.18, Si: 0.22, Mn: 1.56, P: 0.06, S: 0.008, Cr: 0.6, Nb: 0.16, V: 0.1, Ti: 0.19 and the rest are Fe and unavoidable impurities.

[0019] The molten steel is smelted in a converter and continuously cast into slabs. After the slab is heated at 1300°C±10°C, it is rolled into a strip. The final rolling temperature of the strip is 880°C. Within 20 seconds after rolling, the steel plate is rapidly cooled to 750°C for coiling, and the yield strength Rp0. 2 is a coil with 645MPa, tensile strength Rm of 745MPa, and elongation A50.8mm% of 37.0. The plate coil then enters the continuous forming process, and then performs high-frequency induction welding (HFW) under the conditions of high-frequency welding power 550KW, high-frequency welding speed 15m / min, and extrusion amount 5mm. Then heat and hold at 920°C for 40 minutes, then water-cool, and then heat and hold at 560°C for 100 minutes,...

Embodiment 3

[0021] The chemical composition content (percentage by weight) of the steel in this example is C: 0.21, Si: 0.21, Mn: 1.5, P: 0.05, S: 0.006, Cr: 0.5, Nb: 0.17, V: 0.1, Ti: 0.19 and the rest are Fe and unavoidable impurities.

[0022] The molten steel is smelted in a converter and continuously cast into slabs. After the slab is heated at 1220°C±10°C, it is rolled into a strip. The final rolling temperature of the strip is 850°C. Within 16 seconds after rolling, the steel plate is rapidly cooled to 700°C for coiling, and the yield strength Rp0. 2 is a coil with 680MPa, tensile strength Rm of 790MPa, and elongation A50.8mm% of 34.0. The coil then enters the continuous forming process, followed by high-frequency induction welding (HFW) under the conditions of high-frequency welding power 720KW, high-frequency welding speed 18m / min, extrusion amount 5.5mm. Then heat and hold at 900°C for 50 minutes, then water-cool, then heat and hold at 500°C for 100 minutes, then temper, and p...

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Abstract

The invention relates to steel for a straight welding petroleum casing pipe with steel grades of N80, P110 and L80 and the manufacture of the casing pipe. The steel for the straight welding petroleumcasing pipes with the steel grades of N80, P110 and L80 contains the following chemical components in percentage by weight: 0.10-0.24 C, 0.18-0.22 Si, 1.4-1.6 Mn, 0.06-0.08 P, 0.002-0.008 S, 0.3-0.6 Cr, 0.12-0.14 Nb, 0.08-0.12 V, 0.18-0.22 Ti, and the balance of Fe and inevitable impurities. The steel for the petroleum casing pipe with the high steel grades, which is used for well drilling production and technique, is excellent, has reliable technology, stable property, low cost and convenient use and can be widely used for the petroleum casing pipe used for the well drilling production and technique and save production cost for the extraction of petroleum and gas contained in oil fields, thereby having wide market application prospect.

Description

technical field [0001] The invention relates to a steel coil casing for high-steel grade high-frequency straight seam welding oil layer casing and a processing method thereof, more specifically to a steel coil casing for N80, P110, L80 steel grade high-frequency straight seam welding oil layer casing and its processing method. Background technique [0002] At present, many oil fields in my country have entered the middle and late stage of development, and the development difficulty is becoming more and more difficult, and the well conditions are becoming more and more complicated. Application casing development, such as high strength casing, high crush resistance casing, high hydrogen sulfide resistance casing, etc. Therefore, it has become a top priority to carry out in-depth research on the production and technology of high-grade steel-grade high-frequency longitudinal seam welding oil casing, and to manufacture high-quality high-quality high-frequency longitudinal seam we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/28C21C5/28C21D8/10C21D9/08C21D1/25E21B17/00B23K13/00
CPCY02P10/143
Inventor 张华平邱泽胜安克王政明戴荣东周延军王永民袁宗传刘法涛谷云魁刘爱民
Owner 华锐石油钢管有限公司
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