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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 2Cr13 downhole tools, the drilling is difficult and the drilling time is long
[0005] In order to improve turning and drilling performance, 2Cr13 is often used after quenching and tempering, but there are two problems. One is that the ductility is lower than that of the annealed state; the other is that 2Cr13 is often air-cooled after tempering. This is prone to temper brittle defects

Method used

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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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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0022] The invention relates to a heat treatment method, which heat-treats the metal matrix 2Cr13 of the expansion sleeve 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, cooled to room temperature in rapid quenching oil when it is taken out of the furnace, and then tempered at 690-750°C for 2.5 hours. Quenching oil for oil cooling. figure 2 The metallographic structure is quenched at 1000°C and tempered at 710°C. The organization is a sorbite organization, and maintains the distribution of martensite needles. Turning chips quenched at 1000°C and tempered at 710°C. Compared with the turning chips after annealing, the cutting chips are ea...

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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...

Claims

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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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