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High Cr series stainless steel jointless oil well tube and its production method

A production method and technology for oil well pipes, which are applied in the field of stainless steel oil well pipes and their manufacturing, can solve problems such as difficulty in achieving results, reduced material toughness, etc., and achieve the effects of low manufacturing cost, easy operation, and good CO2 corrosion resistance.

Inactive Publication Date: 2006-12-27
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to achieve better results by only controlling the heating temperature.
At the same time, the patent contro

Method used

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  • High Cr series stainless steel jointless oil well tube and its production method

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Experimental program
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Effect test

Embodiment 1

[0027] Φ139.7×9.17mm WSP13Cr casing of 110KSI steel grade.

[0028] ①The steel composition (mass percentage) of the tubing is: C 0.02-0.05, Si 0.3-0.5, Mn0.25-1.0, Cr 12.0-14.0, S<0.010, P<0.015, Ni 3.0-6.0, Mo 1.0- 2.0, Cu≤0.25, Al 0.02-0.04, Ti 0.01-0.06, Nb 0.01-0.04, V≤0.06, and the rest is Fe.

[0029] ② The molten steel containing the above components is decarburized and refined to make a steel billet. The seamless steel pipe is hot rolled into a seamless steel pipe by a limited mandrel rolling mill. No lubricant is used between the rolling head and the billet during rolling, but the material used in the rolling head is (mass percentage): C 0.30, Si 0.30, Mn 0.40, Cr 0.40 , Ni 1.00, Nb 0.45, Mo 1.20, W 5.00, Co 1.20, and the rest is Fe.

[0030] ③ No lubricant is used between the roll and the billet during rolling. In order to overcome the gnawing phenomenon caused by sliding between the perforated roll and the rolled material, an anti-slip agent is required. The anti...

Embodiment 2

[0034] 95KSI steel grade Φ177.8×11.51mm WSP13Cr casing.

[0035] The steel composition (mass percentage) of the bushing is: C 0.15-0.20, Si 0.3-0.6, Mn 0.4-0.75, Cr 12.0-14.0, S<0.010, P<0.015, Ni 3.0-4.0, Cu≤0.25, Al 0.02-0.04, Ti0.01-0.06, V≤0.06, and the rest is Fe.

[0036] Except for ingredients, other manufacturing steps and methods are the same as in Example 1.

[0037] The 95 steel grade WSP13Cr bushing produced by the method has a yield strength of 655-758Mpa, a tensile strength greater than 724Mpa, and a strength index meeting API requirements for C95 / T95 steel grade bushings. This bushing can meet CO 2 The exploitation needs of oil fields and natural gas fields of gas.

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Abstract

This invention can produce high Cr line seamless oil-well tubes. It is about a kind of oil-well tube used to exploit petroleum or natural gas. The compositions are C 0.02-0.25, Si 0.3-1.0, Mn 0.25-1.0, Cr 12.0-14.0, S<0.010, P<0.015, Ni 3.0-6.0, Cu<=0.25, Al 0.02-0.04, Ti 0.01-0.06, Nb 0.01-0.04, V<=0.06, the other are Fe. The liquid steel with the above said composition is decarburized to produce blank, then through the mandrel rolling mill, hot-rolled to seamless tube. Then it is treated with quenching or high-temperature tempering to ensure the intensity and toughness. The benefit is that it has strong CO2 erodent-resistant ability.

Description

technical field [0001] The invention relates to an oil well pipe for exploiting oil or natural gas, in particular to a stainless steel oil well pipe with a Cr content of 12%-14% and a manufacturing method thereof. The oil well pipe has good strength and toughness index and strong resistance to CO 2 Corrosion capability, can meet CO 2 Used in oil or gas wells with corrosive gases. Background technique [0002] Oil and natural gas are important energy sources for human beings. In some oil and gas fields, oil and natural gas are accompanied by a large amount of CO 2 gas. Humid CO 2 Gas is very corrosive to oil well pipes, which can easily cause oil well pipes to fail and lead to a series of vicious accidents. In this case, ordinary oil well pipes cannot meet the requirements for use. For this reason, for CO containing 2 For natural gas wells, API recommends two products, L80 9Cr and L80 13Cr, which have high Cr content and are resistant to CO 2 Good corrosion performance...

Claims

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Application Information

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IPC IPC(8): C22C38/50E21B17/00C22C33/04B21B27/06C21D9/08C21D11/00
Inventor 张毅高连新
Owner WUXI SEAMLESS OIL PIPE
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