A high-strength niobium-containing oil casing based on controlled cooling and its preparation method
A technology for controlling cooling and oil casing, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., and can solve the problems of microstructure coarsening, lack of effective control, and inability to fully exert the strengthening effect of Nb elements and their composite precipitates
Active Publication Date: 2022-06-03
NORTHEASTERN UNIV LIAONING
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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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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0035] Soaking in the furnace, perforation, and its heating temperature is 1300 ° C;
Embodiment 2
[0047] Soaking in the furnace, perforation, and its heating temperature is 1280 ° C;
Embodiment 3
[0057] soaking in the furnace, perforation, and its heating temperature is 1260 ° C;
[0060] Carry out controlled cooling, and the cooling mode is sparse cooling (the cooling spray rings are opened one at a time) to 500 ° C, and then
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Abstract
A high-strength niobium-containing oil casing based on controlled cooling and its preparation method, belonging to the technical field of oil and gas pipes, the oil casing, chemical element mass percentage content (%): C: 0.15-0.25; Si: 0.26-0.30; Mn: 0.7 ~ 1.8; Cr: 0.2 ~ 0.8; Mo: 0.3 ~ 0.8; Nb: 0.03 ~ 0.08; the rest is Fe and other inevitable impurities; while satisfying the relationship (1): ([Mo] 1.6 ‑8.5[Nb]) 2 <0.012 and relational formula (2): 0.015<[Nb]×([C]+[Mn] / 6+[Cr] / 5)<0.03. In the preparation method of the present invention, a controlled cooling process is introduced, combined with component design, to regulate the rolling state structure, improve the mechanical properties, and meet the strength and toughness requirements of deep wells / ultra-deep wells for oil casings.
Description
A kind of high-strength niobium-containing petroleum casing based on controlled cooling and preparation method thereof technical field The invention belongs to the technical field of oil and natural gas pipes, be specifically related to a kind of high-strength niobium-containing stone based on controlled cooling Oil casing and preparation method thereof. Background technique In recent years, with the development of oil exploitation towards deep well / ultra-deep well, the service condition of required oil well pipe is relatively In the past, it was even worse, and the requirements for the strength and toughness of oil well tubular steel were also more stringent. Traditional hot-rolled seamless steel pipe The production process is as follows: the tube blank is heated by the annular heating furnace and continuously pierced, rolled, sizing and other processes at high temperature, and then It is placed on a cooling bed and cooled to room temperature in the air, and finall...
Claims
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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 LIAONING