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Steel for expandable casing for oil well and manufacturing method thereof

An expansion casing and oil well technology, applied in the direction of manufacturing tools, temperature control, resistance welding equipment, etc., can solve the problems of affecting the sealing performance of expandable casing, low strength, and easy sticking of threaded joints, so as to avoid easy cracking , pure steel, avoiding the effect of low plasticity and toughness

Active Publication Date: 2011-08-03
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

The traditional low-carbon or ultra-low-carbon expandable tube material has low strength, and the threaded connection is easy to stick, which affects the sealing performance of the expandable sleeve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mass percent of steel alloy material for oil well expandable casing of the present invention: C: 0.15%, Mn: 1.65%, Si: 0.27%, Al: 0.03%, P: 0.008%, S: 0.003%, N: 0.007%, Ca : 0.003%, Nb: 0.06%, Ti: 0.03%, Mo: 0.26%, Re: 0.036, and the rest is Fe. Mn:Si: 6.1:1.

[0018] Manufacture of expandable casing for oil well:

[0019] Firstly, hot-rolled coils are prepared: the above-mentioned steel materials (components) for expandable casing for oil wells are smelted in an oxygen-blown converter, continuously cast into slabs with a thickness of about 250mm, heated to about 1200°C, and heated at a temperature of 1050-1100°C Rough rolling is carried out at the same time, and finish rolling is carried out at a temperature of 900°C. After rolling, water is sprayed for cooling, the cooling rate is 15-20°C / s, and the coiling temperature is 580°C to make a hot-rolled coil with a thickness of about 10mm.

[0020] Secondly, hot-rolled coils are used to produce straight seam resista...

Embodiment 2

[0025] Mass percentage of steel alloy material for oil well expandable casing: C: 0.09%, Mn: 1.74%, Si: 0.21%, Al: 0.04%, P: 0.007%, S: 0.004%, N: 0.007%, Ca: 0.002 %, Nb: 0.05%, Ti: 0.03%, Cr: 0.33%, Re: 0.045, and the rest Fe. Mn:Si is 8.28:1.

[0026] Manufacture of expandable casing for oil well:

[0027] First, prepare hot-rolled coils: the above-mentioned steel materials (components) for expandable oil well casings are smelted in an oxygen-blown converter, and then continuously cast into slabs with a thickness of about 250mm, heated to about 1200°C, and heated at a temperature of 1080~ Rough rolling is carried out at 1100°C, finish rolling is carried out at 780-950°C, water is sprayed for cooling after rolling, the cooling rate is 15-20°C / s, and the coiling temperature is 520-600°C to make a hot-rolled sheet with a thickness of about 12.7mm roll.

[0028] Secondly, hot-rolled coils are used to produce straight seam resistance welded steel pipes. The edge milling metho...

Embodiment 3

[0033] Mass percent of steel alloy material for oil well expandable casing of the present invention: C: 0.12%, Mn: 1.61%, Si: 0.24%, Al: 0.04%, P: 0.009%, S: 0.004%, N: 0.007%, Ca : 0.004%, Nb: 0.07%, V: 0.05%, Ti: 0.04%, Ni: 0.24%, Cu: 0.17%, Re: 0.032, and the rest is Fe. Mn:Si is 6.7:1.

[0034] Manufacture of expandable casing for oil well:

[0035] Firstly, hot-rolled coils are prepared: the above-mentioned steel materials (components) for expandable casing for oil wells are smelted in an oxygen-blown converter, continuously cast into slabs with a thickness of about 250mm, heated to about 1200°C, and heated at a temperature of 1000-1100°C Rough rolling is carried out when the temperature is 770-940 ° C, and water is sprayed for cooling after rolling. The cooling rate is 18-23 ° C / s, and the coiling temperature is 540-590 ° C. It is made into a hot-rolled sheet with a thickness of about 14.3mm. roll.

[0036] Secondly, hot-rolled coils are used to produce straight seam ...

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Abstract

The invention discloses steel for an expandable casing for an oil well and a manufacturing method thereof, and the manufacturing method is applied to preparing the expandable casing for the oil well for petroleum and gas industrial oil. The steel alloy material of the expandable casing for the oil well comprises the following components in percentage by weight: 0.08 to 0.2 percent of C, 1 to 2 percent of Mn, 0.15 to 0.35 percent of Si, 0.02 to 0.06 percent of Al, less than or equal to 0.01 percent of P, less than or equal to 0.05 percent of S, less than or equal to 0.08 percent of N, 0.001 to0.005 percent of Ca, and the balance of Fe. The method for preparing the expandable casing for the oil well comprises the following steps of: preparing hot rolled steel coils; producing straight seamresistance welded steel pipes by using the hot rolled steel coils; normalizing welding lines after welding; and finally, cutting into welded steel pipes, and machining API standard threads or specialthreads at two ends of each welded steel pipe by using a numerical control machine. The steel for the expandable casing for the oil well has the advantages of excellent comprehensive performance suchas expansion deformation capacity, intensity, toughness, and the like, no defect of the welding lines and uniform and consistent performance with base metals.

Description

technical field [0001] The invention relates to steel for solid expandable casing for oil and gas wells in the petroleum and natural gas industry and a manufacturing method thereof. The expandable casing manufactured by the provided material and process has good comprehensive performance and can meet the needs of oil and gas well completion or oil and gas well casing repair. Background technique [0002] At present, the solid expandable casing SET (Solid Expandable Tubular) technology is a kind of drilling, completion and workover in which the casing string is radially expanded to the required diameter in the wellbore for the purpose of "saving" the borehole size. Well new technology. The application of this technology can increase the number of casing layers to be lowered, bringing "revolutionary" impact and significant technical and economic benefits to deep wells, drilling and wellbore structures with complex geological conditions. It can make the wellbore "thin" and si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06B23K11/34C21D9/08B21B37/74
Inventor 冯耀荣上官丰收刘强刘永刚杨龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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