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

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

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) B21C 37/06 (2006.01) C21D 8/10 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/18 (2006.01)

Patent

CA 2638681

An oil country tubular good for expansion according to the invention is expanded in a well. The oil country tubular good for expansion has a composition containing, in percentage by mass, 0.05% to 0.08% C, at most 0.50% Si, 0.80% to 1.30% Mn, at most 0.030% P, at most 0.020% S, 0.08% to 0.50% Cr, at most 0.01% N, 0.005% to 0.06% Al, at most 0.05% Ti, at most 0.50% Cu, and at most 0.50% Ni, and the balance consisting of Fe and impurities, and a structure having a ferrite ratio of at least 80%. The oil country tubular good for expansion has a yield strength in the range from 276 MPa to 379 MPa and a uniform elongation of at least 16%. Therefore, the oil country tubular good according to the invention has a high pipe expansion characteristic.

L'invention concerne une canalisation de puits pétrolier pour une application d'expansion de canalisation et destinée à être expansée dans un puits. La canalisation de puits pétrolier possède à la fois, une composition chimique qui comprend une quantité en masse de C de 0,05 à 0,08 %, de Si de 0,50 % ou moins, de Mn de 0,80 à 1,30 %, de P de 0,030 % ou moins, de S de 0,020 % ou moins, de Cr de 0,08 à 0,50 %, de N de 0,01 % ou moins, d'Al de 0,005 à 0,06 %, de Ti de 0,05 % ou moins, de Cu de 0,50 % ou moins, et de Ni de 0,50 % ou moins, le complément étant constitué de Fe et d'impuretés, et une structure ayant une teneur en ferrite de 80 % ou plus. En outre, la canalisation de puits pétrolier présente une limite d'élasticité de 276 à 379 MPa et un allongement uniforme de 16 % ou plus, montrant ainsi une excellente aptitude à l'expansion de canalisation.

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