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Steel used for straight seam electric resistance welding petroleum casing and casing manufacturing method

A technology of straight seam resistance welding and oil casing, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of low weld toughness, easy sticking, and easy to produce defects in the weld, and achieve good anti-sticking performance , the effect of excellent strength and toughness

Active Publication Date: 2011-06-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a steel for straight seam resistance welding petroleum casing and a method for manufacturing the casing. Aiming at the problems of easy sticking and buckling of the threaded connection parts of the resistance welding casing, easy occurrence of defects in the weld seam, and low toughness of the weld seam, through steel The optimized design of chemical composition and casing manufacturing process provides a steel for straight seam resistance welding oil casing with excellent comprehensive properties such as anti-sticking of threads, excellent strength and toughness of base metal and weld seam, and good extrusion resistance, and its manufacturing method To meet the reliability and economical requirements of oil and gas field exploration and development for straight seam resistance welded oil casing

Method used

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Examples

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Effect test

Embodiment 1

[0019] Embodiment 1: Taking a batch of straight seam resistance welding oil casing steel and the casing manufacturing method as an example, the present invention will be further described in detail.

[0020] The mass percentage of steel alloy composition (each component) for straight seam resistance welding oil casing pipe is, C: 0.18%, Mn: 1.36%, Si: 0.21%, P: 0.008%, S: 0.003%, N: 0.007%, Ca : 0.003%, Al: 0.03%, Nb: 0.04%; Ti: 0.03%; the rest Fe. Wherein the ratio of Mn to Si is about 6.5:1.

[0021] Method for manufacturing straight seam resistance welded petroleum casing:

[0022] Firstly, hot-rolled coils are prepared: the components of the steel for straight seam resistance welding oil casing are smelted in an oxygen-blown converter, refined outside the furnace, and vacuum degassed; through continuous casting, a slab with a thickness of 250mm is made; and then heated to about 1200°C; the temperature is lowered to 1080-1100°C for rough rolling, and the temperature is 85...

Embodiment 2

[0028] The mass percentage of steel alloy composition (each component) for straight seam resistance welding oil casing pipe is, C: 0.23%, Mn: 1.54%, Si: 0.27%, P: 0.007%, S: 0.004%, N: 0.007%, Nb : 0.07%, Ti: 0.03%, Ca: 0.002%, Al: 0.04%, Mo: 0.23%, Cr: 0.18%, B: 0.003%, and the rest Fe. Among them, the ratio of Mn to Si is about 5.7:1.

[0029] Method for manufacturing straight seam resistance welded petroleum casing:

[0030] Firstly, hot-rolled coils are prepared: the components of the steel for straight seam resistance welding oil casing are smelted in an oxygen-blown converter, refined outside the furnace, and vacuum degassed; through continuous casting, a slab with a thickness of 250mm is made; and then heated to about 1200°C; the temperature is lowered to 1000-1100°C for rough rolling, and the temperature is 850-900°C for finish rolling. Taken, the coiling temperature is 500~600℃, and the hot-rolled coil with a wall thickness of 9.19 mm and excellent comprehensive per...

Embodiment 3

[0037] The mass percentage of steel alloy composition (each component) for straight seam resistance welding oil casing pipe is, C: 0.27%, Mn: 1.59%, Si: 0.21%, P: 0.009%, S: 0.006%, N: 0.006%, Nb : 0.06%, V: 0.05%, Ti: 0.04%, Ca: 0.003%, Al: 0.05%, Mo: 0.28%, Cr: 0.19%, Cu: 0.18%, Ni 0.25%, and the rest Fe. Among them, the ratio of Mn to Si is about 7.6:1.

[0038] Method for manufacturing straight seam resistance welded petroleum casing:

[0039] First, prepare hot-rolled coils: the components of the steel for straight seam resistance welding oil casing are smelted in an oxygen-blown converter, refined outside the furnace, and vacuum degassed; they are continuously cast into a slab with a thickness of 250mm; and then heated to about 1200 ℃; the temperature is lowered to 1080-1100 ℃ for rough rolling, and the temperature is 870-950 ℃ for finish rolling. After finishing rolling, spray water to cool at a cooling rate of 18-23 ℃ / s; ℃, to make a hot-rolled coil with a wall thick...

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Abstract

The invention relates to a steel used for straight seam electric resistance welding petroleum casing and a casing manufacturing method, which is applied to a straight seam electric resistance welding petroleum casing used for an oil and gas well in petroleum and gas industry. The steel used for the straight seam electric resistance welding petroleum casing comprises the following components in percentage by mass: 0.15-0.28% of C, 1.0-1.6% of Mn, 0.2-0.4% of Si, 0. 02-0.06% of Al, less than or equal to 0.01% of P, less than or equal to 0.005% of S, less than or equal to 0.008% of N, 0.001-0.005% of Ca and the balance of Fe. The preparation method comprises the steps of: preparing hot-rolled plate coils, producing straight seam electric resistance welding steel pipes by the hot-rolled platecoils, carrying out welding seam normalization or overall normalization on the welded steel pipes, straightening and cutting the normalized or tempered welded steel pipes into pipe segments with the length of 10-12m, and processing API standard screw threads. The invention has the advantages that the steel has good strength and toughness, the welding seam has no defect, and the properties of the steel are uniform with those of mother material. The yield strength is greater than or equal to 380-760MPa, the tensile strength is greater than or equal to 520-865MPa, the elongation is greater than or equal to 20%, and the impact energy of a room-temperature transverse full-size V-shaped notch is greater than or equal to 40J.

Description

technical field [0001] The invention relates to a steel for straight seam resistance welding oil casing for oil and gas wells in the petroleum and natural gas industry and a manufacturing method thereof. The straight seam electric resistance welded oil casing manufactured with the provided material and process has good comprehensive performance and meets the needs of oil and gas well drilling and well completion. Background technique [0002] The use of straight seam resistance welding method to produce petroleum casing has the characteristics of high production efficiency; because the hot-rolled coils used in resistance welding are produced by controlled rolling method, they have high wall thickness accuracy. The precision is also very good; together with the development of welding technology and the progress of non-destructive testing technology, the quality of LSW pipe has been greatly improved, and its high yield also shows its good economy. However, quality accidents i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C21D1/18C22C38/38C21D9/08C22C38/40C22C38/58C22C38/06B23P17/04
CPCY02P10/20
Inventor 冯耀荣王新虎杨龙申昭熙王建东刘文红宋生印
Owner BC P INC CHINA NAT PETROLEUM CORP
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