Oil and bushing low-temperature powder embedding aluminizing agent for petroleum

A technology of powder embedding and special oil, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of matrix microstructure, mechanical performance index limitation, failure to meet the mechanical performance requirements of oil and casing, Change the microstructure and properties to achieve good high-temperature oxidation resistance, increase dislocation density, and increase bonding strength

Active Publication Date: 2008-04-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, oil pipes and casings belong to petroleum special pipes with high degree of alloying, and their matrix microstructure and mechanical performance indicators are strictly limited by relevant standards. Aluminizing higher than its annealing temperature (about 560 ° C) will significantly change its microstructure and mechanical properties. The performance of the workpiece deteriorates the performance of the workpiece, which cannot meet the mechanical performance requirements of the oil and casing in the oil and gas field, which brings a series of serious problems. Aluminizing is the main technical problem that must be solved

Method used

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  • Oil and bushing low-temperature powder embedding aluminizing agent for petroleum
  • Oil and bushing low-temperature powder embedding aluminizing agent for petroleum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 6

[0022] A section of 400mm long N80 oil pipe (new pipe) was acid-washed and coated with a protective coating, and then solid powder aluminized in a box-type resistance furnace at 450°C. Solid solution in iron, the outer layer is FeAl 2, FeAl, and aluminum solid solution coexistence in steel, after cooling in the furnace, the protective coating naturally peels off, the surface of the oil pipe remains clean, the size of each phase of the oil pipe after infiltration is within the allowable range, and the matrix structure does not change significantly, which still meets the requirements. Industry standard requirements.

[0023] Above-mentioned embodiment penetrating agent formula is as follows table:

[0024] Table 1: Percent distribution table of each penetrating agent component of the embodiment, %

[0025] 150 mesh

[0026] ※Among them, in the zinc-aluminum alloy powder, the aluminum content is 58.5% by weight, and in the iron-aluminum alloy powder, the aluminum co...

Embodiment 1

[0027] Example 1 The thickness of the infiltrated layer is 0.12mm, the interface is regular, and it is well combined with the matrix. The matrix structure has not changed, the grain size has changed from 11 to 10, the mechanical properties have not changed much, and it still meets the API standard. The morphology of the infiltrated layer and the matrix structure such as figure 1 (a) shown. The aluminized effect of embodiment 2 is the same as that of embodiment 1.

Embodiment 3

[0028] Example 3 The seepage layer on the inner wall of the oil pipe is about 0.21 mm, and from the outside to the inside are solid solutions of aluminum in steel, FeAl, FeAl 2 , Fe 2 al 5 , The solid solution of zinc in iron, the dimensions of the oil pipe after seepage are within the allowable range. The interface of the infiltrated layer is regular, and it is well combined with the matrix. The matrix structure and mechanical properties have not changed significantly. The morphology of the obtained infiltrated layer and the matrix structure after infiltration are as follows: figure 1 (b) shown. The aluminized effect of Examples 4-6 is the same as that of Example 3.

[0029] After sealing the oil pipe samples obtained in the above two examples 2 and 6 from both ends with ceramics (with a small hole at one end), each inject 10% H 2 S+3%NaCl solution, after being sealed, the corrosion resistance test was carried out. At the same time, the 1Cr18Ni9Ti stainless steel pipe and...

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Abstract

The low temperature quick aluminizing agent specially for petroleum pipe and casing consists of metal source, activator, catalyst and stuffing. The metal source consists of 150-mesh Al powder in 10-20 wt% of the aluminizing agent, 120-mesh Zn powder in 10-25 wt%, 150-mesh Zn-Fe alloy powder in 10-20 wt% and/or 150-mesh Fe-Al alloy powder in 10-15 wt%. The activator consists of ammonium chloride, aluminum chloride, sodium fluoride and/or potassium bifluoride. The catalyst consists of 100-mesh Mo powder in 0-3 wt% and La and Os 0-3 wt%, with La and Os in the weight ratio of 1 to 1. The stuffing is 100-mesh alumina powder. The aluminizing agent is applied at 380-500 deg.c to obtain aluminized layer.

Description

technical field [0001] The invention relates to a metal surface treatment agent, in particular to a low-temperature rapid aluminizing agent for petroleum special oil and casing. Background technique [0002] Corrosion of oil and gas pipelines will cause huge economic losses to oil and gas fields, and even lead to catastrophic accidents, environmental pollution, and adverse social impact. At present, in my country's oil industry, corrosion problems under high H2S, CO2 and high temperature and high pressure coupling conditions getting worse. In order to solve this problem, methods such as surface coating, lining stainless steel, glass steel pipe and slow-release agent are usually adopted at home and abroad. The surface coating process is simple, but the bonding force with the substrate is poor, and it is easy to fall off; the lining stainless steel process is complex, poor in stability, and high in cost; the glass steel pipe has excellent anti-corrosion performance, but its pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/48C23C10/50
Inventor 韩礼红林凯解宝江冯耀荣宋生印
Owner BC P INC CHINA NAT PETROLEUM CORP
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