Heat treatment method for metal expansion bush

A heat treatment method and metal expansion technology, applied in the field of heat treatment, can solve problems such as sticking to the knife, reduced ductility, and difficulty in drilling, and achieve the effects of easy bending and breaking, reduced wear, and improved drilling efficiency

Inactive Publication Date: 2018-03-06
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology

The annealed 2Cr13 has high ductility, which can realize the expansion seat sealing function of the expansion sleeve, but its work hardening is serious during cutting, and the cutting resistance is relatively large during the product processing process, and the turning chips are not easy to bend and break, which is easy to cause sticking to the knife and damaged tools; when drilling

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  • Heat treatment method for metal expansion bush
  • Heat treatment method for metal expansion bush
  • Heat treatment method for metal expansion bush

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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0022] The present invention is a heat treatment method. The metal matrix 2Cr13 of the expansion sleeve is heat treated through the process of quenching and high temperature tempering, so that it has good ductility and drillability.

[0023] Such as image 3 As shown, the present invention adopts the quenching and high temperature tempering process: the workpiece is kept at 1000°C for 1.5 hours, and the workpiece is cooled to room temperature in rapid quenching oil, and then tempered at 690-750°C for 2.5 hours. The quenching oil is oil-cooled. figure 2 It is a metallographic structure quenched at 1000°C and tempered at 710°C. The organization is a sorbite organization, and the martensite needle position distribution is maintained. Turning chips quenched at 1000°C and tempered at 710°C. Compared with the turning chips after annealing, the chips are easy to curl...

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Abstract

The invention provides a heat treatment method for a metal expansion bush, and belongs to the field of heat treatment. The heat treatment method comprises: carrying out quenching and high temperaturetempering on a metal expansion bush, and carrying out oil cooling on the tempered metal expansion bush. With the method of the present invention, the good ductility of the expansion bush can be ensured, the drilling time is shortened to 16 min from 40 min compared to the drilling time in the annealing state so as to substantially improve the drilling efficiency, and during the turning processing of the work-piece, the cutting chips are easy to bend and break, such that the production efficiency and the surface finish of the work-piece are improved, and the wear on the cutter is reduced.

Description

technical field [0001] The invention belongs to the field of heat treatment, and in particular relates to a heat treatment method for a metal expansion sleeve. Background technique [0002] Large diameter bridge plug is an advanced reservoir stimulation technology in the process of oil and gas field development, which can realize large-scale fracturing and completion, and has the advantages of large diameter, good reverse displacement and high single well construction rate. [0003] The expansion sleeve is the main seal of the large-diameter bridge plug. It uses a metal skeleton-rubber combination seal. Due to the expansion and setting mechanism of the metal skeleton, the expansion sleeve requires a material with high strength and ductility to realize the rubber sleeve. For setting and sealing, the material selected for this metal support frame is martensitic stainless steel 2Cr13 with high strength and good ductility. [0004] In order to ensure that the expansion sleeve h...

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Application Information

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IPC IPC(8): C21D9/00C21D1/18
CPCC21D9/0068C21D1/18
Inventor 袁大勇吴晋霞马善坤薛占峰黄勇尹磊
Owner CHINA PETROLEUM & CHEM CORP
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