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High-strength niobium-containing petroleum casing pipe based on controlled cooling and preparation method of high-strength niobium-containing petroleum casing pipe

A technology for controlling cooling and oil casing, applied in casing, drill pipe, earth-moving drilling, etc., can solve the problems of inability to fully exert the strengthening effect of Nb element and its composite precipitation phase, coarsening of the structure, lack of effective control and so on

Active Publication Date: 2022-03-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patented technology adopts air cooling method for cooling after sizing, which lacks effective control in the phase transformation of the rolled structure, resulting in coarsening of the structure, and the strengthening effect of the Nb element and its composite precipitates cannot be fully exerted. Grain strengthening and precipitation strengthening are limited

Method used

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  • High-strength niobium-containing petroleum casing pipe based on controlled cooling and preparation method of high-strength niobium-containing petroleum casing pipe
  • High-strength niobium-containing petroleum casing pipe based on controlled cooling and preparation method of high-strength niobium-containing petroleum casing pipe
  • High-strength niobium-containing petroleum casing pipe based on controlled cooling and preparation method of high-strength niobium-containing petroleum casing pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high-strength niobium-containing oil casing based on controlled cooling, the mass percentage content of chemical elements is: C: 0.20%; Si: 0.30%; Mn: 0.78%; Cr: 0.22%; Mo: 0.78%; Nb: 0.071% ; The rest are Fe and other unavoidable impurities, satisfying relational formula (1): ([Mo] 1.6 -8.5[Nb]) 2 <0.012 and relational formula (2): 0.015<[Nb]×([C]+[Mn] / 6+[Cr] / 5)<0.03.

[0033] The preparation method of the above-mentioned high-strength niobium-containing oil casing based on controlled cooling includes the following steps:

[0034] Smelting and continuous casting to obtain tube blanks;

[0035] Soak in the furnace, perforate, and the heating temperature is 1300°C;

[0036] Carry out the rolling process, the rolling temperature is 1200°C and the final rolling temperature is 950°C;

[0037] Sizing, the final wall thickness is 10mm;

[0038]Carry out controlled cooling, the cooling method is continuous cooling to 550°C, and then air cooling to room temperature, with...

Embodiment 2

[0044] A high-strength niobium-containing petroleum casing based on controlled cooling, the mass percent content of chemical elements is the same as that in Example 1.

[0045] The preparation method of the above-mentioned high-strength niobium-containing oil casing based on controlled cooling includes the following steps:

[0046] Smelting and continuous casting to obtain tube blanks;

[0047] Soak in the furnace, perforate, and the heating temperature is 1280 °C;

[0048] Carry out the rolling process, the rolling temperature is 1180°C and the final rolling temperature is 945°C;

[0049] Sizing, the final wall thickness is 8mm;

[0050] Carry out controlled cooling, the cooling method is continuous cooling to 650°C, and then air cooling to room temperature, with an average cooling rate of about 44°C / s;

[0051] The off-line heat treatment process is carried out, the quenching heating temperature is 900°C, the quenching holding time is 60min, the tempering heating temperat...

Embodiment 3

[0054] A high-strength niobium-containing petroleum casing based on controlled cooling, the mass percent content of chemical elements is the same as that in Example 1.

[0055] The preparation method of the above-mentioned high-strength niobium-containing oil casing based on controlled cooling includes the following steps:

[0056] Smelting and continuous casting to obtain tube blanks;

[0057] Soak in the furnace, perforate, and the heating temperature is 1260°C;

[0058] The rolling process is carried out, and the rolling temperature is 1160°C and the final rolling temperature is 920°C;

[0059] Sizing, the final wall thickness is 13mm;

[0060] Carry out controlled cooling, the cooling method is sparse cooling (cooling spray rings are opened one at a time) to 500°C, and then air-cooled to room temperature, the average cooling rate is about 36°C / s;

[0061] The off-line heat treatment process is carried out, the quenching heating temperature is 900°C, the quenching holdin...

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Abstract

The invention relates to a high-strength niobium-containing petroleum casing pipe based on controlled cooling and a preparation method of the high-strength niobium-containing petroleum casing pipe, and belongs to the technical field of petroleum and natural gas pipes. 0.26 to 0.30 of Si; 0.7 to 1.8 parts of Mn; 0.2 to 0.8 part of Cr; 0.3 to 0.8 part of Mo; 0.03 to 0.08 part of Nb; and the balance of Fe and other inevitable impurities. The relational expression (1): [Mo] 1.6-8.5 [Nb] 2 < 0.012 and the relational expression (2): 0.015 < [Nb] * ([C] + [Mn] / 6 + [Cr] / 5) < 0.03 are satisfied at the same time. According to the preparation method, a controlled cooling process is introduced, component design is combined, a rolled structure is regulated and controlled, the mechanical property is improved, and the obdurability requirement of a deep well / ultra-deep well on the petroleum casing pipe is met.

Description

technical field [0001] The invention belongs to the technical field of oil and gas pipes, and in particular relates to a high-strength niobium-containing oil casing based on controlled cooling and a preparation method thereof. Background technique [0002] In recent years, with the development of oil production in the direction of deep wells / ultra-deep wells, the service conditions of oil well pipes required are more severe than before, and the requirements for the strength and toughness of oil well pipe steels are also more stringent. The traditional production process of hot-rolled seamless steel pipes is as follows: after the tube blank is heated by an annular heating furnace, the processes of piercing, rolling, and sizing are continuously carried out at high temperature, and then it is placed on a cooling bed and air-cooled to room temperature, and finally reheated and quenched. Off-line quenching and tempering heat treatment for high temperature tempering. Under this p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/22C22C38/26C21D8/10C21D1/18E21B17/00
CPCC22C38/02C22C38/04C22C38/38C22C38/22C22C38/26C21D8/105C21D1/18E21B17/00Y02P10/143
Inventor 康健王云开王超袁国
Owner NORTHEASTERN UNIV