High anti-extrusion petroleum casing pipe and method for producing same

A technology of oil casing and production method, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., can solve the problems of small application range and high production cost, and achieve the effect of reasonable heat treatment process, low cost and simple production process

Inactive Publication Date: 2005-09-07
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Its disadvantages are: the steel type used in the casing is Cr-Mo steel, and the production cost is high; the outer diameter of the casing is Φ152-154mm, and the scope of application is small

Method used

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Examples

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Effect test

Embodiment Construction

[0013] The first embodiment of this design is a Φ139.70×7.72mm WSP110T high-collapse casing of 110KSI steel grade.

[0014] ①The steel composition of the casing is:

[0015] C 0.34-0.39, Si 0.20-0.35, Mn 1.25-1.50, Al 0.06-0.09, S<0.010, P<0.015, Cr<0.20, Ni<0.20, Cu<0.20

[0016] ② The control range of geometric accuracy of the bushing is as follows:

[0017] Casing outer diameter: 139.82-140.46mm, wall thickness: 7.76-8.42mm, wall thickness unevenness: <13%, outer diameter out-of-roundness: <0.45%

[0018] ③The heat treatment process of the casing is:

[0019] The quenching + tempering process is adopted, and the quenching adopts the water quenching process, the quenching temperature is 860°C ± 10°C, and the tempering temperature is 500°C ± 10°C.

[0020] After heat treatment, the mechanical properties of the material can reach the following technical indicators: yield strength: 834-1062Mpa; tensile strength: ≥948Mpa; elongation: ≥15%; impact energy: ≥26J (10×5L); Level ...

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Abstract

A petroleum branch pipe with high collapsing strength and production method, which belongs to petroleum branch pipe technology. Steel element of branch pipe comprises 0.34-0.39 wt% of C, 0.20-0.35 wt% of Si, 1.25-1.50 wt% of Mn, 0.06-0.09 wt% of Al, S less than 0.010 wt%, P less than 0.015 wt%, Cr less than 0.20 wt%, Ni less than 0.20 wt% and Cu less than 0.20 wt%. Said branch pipe adopts heat treating process of quenching first and drawing second, in which hardening agent is water, hardening temperature is 860+/-10 Deg. C and drawing temperature is more than 500 Deg. C. After heat treating, branch pipe is treated with hot straightening under the temperature between 450 and 480 Deg, C. Collapsing strength of the branch pipe is higher than API normalized value, whereas the cost of manufacture is less than 5%.

Description

technical field [0001] The invention belongs to a high-strength petroleum casing and a production method thereof, in particular to a petroleum casing with high anti-collapse performance and a production method thereof, and belongs to the technical field of petroleum casing. Background technique [0002] With the increase of drilling depth and the advancement of drilling technology, oil casings need to bear more external extrusion loads than before. In some cases, ordinary oil casings are difficult to meet the requirements of use, and have high anti-extrusion performance. The amount of "high anti-extrusion casing" is increasing. There are many factors affecting the anti-collapse performance of casing, among which the main factors are: material strength, casing wall thickness, residual stress, out-of-roundness of outer diameter, unevenness of wall thickness, etc. For the casing production plant, according to its own equipment and process conditions, determining the main facto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D7/00C22C38/06C22C38/42E21B17/00
Inventor 高连新张毅黄淳朴龙华
Owner WUXI SEAMLESS OIL PIPE
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