Oil country tubular good for expansion in well and duplex...

Details Oil country tubular good for expansion in well and duplex... Oil country tubular good for expansion in well and duplex...

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/40 (2006.01) C22C 38/58 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2638289

An oil country tubular good for expansion according to the invention is expanded in a well. The oil country tubular good for expansion according to the invention is formed of duplex stainless steel having a composition containing, in percentage by mass, 0.005% to 0.03%C, 0.1% to 1.0% Si, 0.2% to 2.0% Mn, at most 0.04% P, at most 0.015% S, 18.0% to 27.0% Cr, 4.0% to 9.0% Ni, at most 0.040% Al, and 0.05% to 0.40% N, and the balance consisting of Fe and impurities, a structure including an austenite ratio in the range from 40% to 90%. The oil country tubular good for expansion according to the invention has a yield strength from 256 MPa to 655 MPa, and a uniform elongation more than 20%. Therefore, the oil country tubular good for expansion according to the invention has a high pipe expansion characteristic.

L'invention concerne une conduite de puits de pétrole pour dilatation qui est dilatée dans un puits. La conduite de puits de pétrole est constituée d'un acier inoxydable à deux phases qui présente une composition chimique contenant, en termes de % en masse, de 0,005 à 0,03 % de carbone, de 0,1 à 1,0 % de silicium, de 0,2 à 2,0 % de manganèse, jusqu'à 0,04 % de phosphore, jusqu'à 0,015 % de soufre, de 18,0 à 27,0 % de chrome, de 4,0 à 9,0 % de nickel, jusqu'à 0,040 % d'aluminium et de 0,05 à 0,40 % d'azote, le reste étant du fer et des impuretés, et possède une structure ayant une teneur en austénite de 40 à 90 %. La conduite de puits de pétrole pour dilatation présente une résistance à la déformation de 276 à 655 MPa et un allongement uniforme supérieur à 20 %. La conduite de puits de pétrole possède une excellente capacité de dilatation.

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