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Processing technology of steel-grade petroleum sleeve

A technology for oil casing and processing technology, which is applied to manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of large fluctuations in the yield strength of steel pipes, can not fully meet the standard requirements, and poor mechanical properties of products, so as to reduce the number of heads and tails. Performance difference, improved mechanical properties, good use effect

Inactive Publication Date: 2018-12-18
LINZHOU FENGBAO PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield strength of the steel pipe fluctuates greatly during production, and the mechanical properties of the processed product are not good, which cannot fully meet the standard requirements, and the passing rate of one-time inspection during processing is less than 60%.

Method used

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  • Processing technology of steel-grade petroleum sleeve
  • Processing technology of steel-grade petroleum sleeve
  • Processing technology of steel-grade petroleum sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The processing steps of the oil casing are as follows:

[0030] (1) Steelmaking with melting material in electric furnace, and vacuum inflation to make tube blank;

[0031] (2) Carry out perforation, rolling and sizing of the tube blank, and online quenching in the quenching machine;

[0032] (3) Fully temper and keep warm after quenching to obtain oil casing;

[0033] (4) Machining is carried out after cooling and forming.

[0034] The tempering holding time in the step (3) is 127 minutes.

[0035] In the step (2), when the tail of the steel pipe is quenched, the temperature is 800°C.

[0036] The water spray pressure in the quenching machine in the step (2) is 1.5kg.

[0037] The rotation speed of the support wheel in the quenching machine in the step (2) is 75r / min.

[0038] All the burners of the electric furnace have been readjusted before each step (1) production.

[0039] After the step (1) is finished, the gas pipeline is cleaned up during the shutdown for...

Embodiment 2

[0043] The processing steps of the oil casing are as follows:

[0044] (1) Steelmaking with melting material in electric furnace, and vacuum inflation to make tube blank;

[0045] (2) Carry out perforation, rolling and sizing of the tube blank, and online quenching in the quenching machine;

[0046] (3) Fully temper and keep warm after quenching to obtain oil casing;

[0047] (4) Machining is carried out after cooling and forming.

[0048] The tempering holding time in the step (3) is 160 minutes.

[0049] In the step (2), when the tail of the steel pipe is quenched, the temperature is 800°C.

[0050] The water spray pressure in the quenching machine in the step (2) is 1.5kg.

[0051] The rotation speed of the support wheel in the quenching machine in the step (2) is 75r / min.

[0052] All the burners of the tempering furnace have been readjusted before each step (1) production.

[0053] After the step (1) is finished, the gas pipeline is cleaned up during the shutdown fo...

Embodiment 3

[0057] The processing steps of the oil casing are as follows:

[0058] (1) Steelmaking with melting material in electric furnace, and vacuum inflation to make tube blank;

[0059] (2) Carry out perforation, rolling and sizing of the tube blank, and online quenching in the quenching machine;

[0060] (3) Fully temper and keep warm after quenching to obtain oil casing;

[0061] (4) Machining is carried out after cooling and forming.

[0062] The tempering holding time in the step (3) is 160 minutes.

[0063] In the step (2), when the tail of the steel pipe is quenched, the temperature is 800°C.

[0064] The water spray pressure in the quenching machine in the step (2) is 3.0kg.

[0065] The rotation speed of the support wheel in the quenching machine in the step (2) is 95r / min.

[0066] All the burners of the tempering furnace have been readjusted before each step (1) production.

[0067] After the step (1) is finished, the gas pipeline is cleaned up during the shutdown fo...

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Abstract

The invention discloses a processing technology of a steel-grade petroleum sleeve. The processing technology comprises the specific processing steps that melting and steel-making are performed in an electric furnace and a tube blank is made by vacuum inflation; the pipe blank is perforated, rolled, sized, and is subjected to on-line quenching in a quenching machine; after quenching, fully tempering and heat preservation are performed, and an petroleum sleeve is obtained; and machining is performed after cooling molding. According to the processing technology of the steel-grade petroleum sleeve, tempering heating and heat preservation in the step 1 are performed for 160 minutes to ensure the full tempering of a steel tube in the furnace and ensure the sufficient transformation of the structure; in the step 2, when the end portion of the quenching steel tube is subjected to quenching, since the head and tail hardenability has a difference, the overall is lowered to 790 DEG C when the tail portion of the steel pipe is produced to ensure that the head and tail performance basically similar; and the product quality is improved, the mechanical properties of the adjusted petroleum sleeveare significantly improved, the qualified rate is greatly improved, the economic benefit is improved, and the better application prospects are brought.

Description

technical field [0001] The invention relates to the field of oil casings, in particular to a processing technology for steel-grade oil casings. Background technique [0002] Oil casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes; [0003] Oil casing is a steel pipe product widely used in the petroleum industry. Standard oil casing steel grades have strict mechanical performance indicators and a very narrow range of yield strength. Compared with the existing quenching and tempering furnaces, it is very difficult. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D11/00B23P15/00
CPCC21D9/085B23P15/00C21D11/00
Inventor 李静敏肖永忠高磊冯带兵贾宁波李东亮李海军党广亮刘伏红李如松
Owner LINZHOU FENGBAO PIPE