E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 23/00 (2006.01) E21B 17/00 (2006.01) E21B 21/00 (2006.01) E21B 21/10 (2006.01) E21B 33/14 (2006.01) E21B 33/16 (2006.01) E21B 43/10 (2006.01)
Patent
CA 2200415
The invention relates to a well casing 11 comprising at least two casing lengths12, 13, 14, 15, 16 with a first casing section 12 having and outside diameter OD12 and an inside diameter ID12 being fitted and cemented in position extending downwardly from the top of the well. The remaining sections are installed subsequently each subsequent casing section 13, 14, 15, 16 having an outside diameter OD13, OD14, OD15, OD16 and an inside diameter ID13, ID14, ID15, ID16 and the diametrical difference D1, D2, D3, D4, D5 between the outside diameter OD13, OD14, OD15, OD16 of the sections 13, 14, 15, 16 being less that the internal diameter ID12, ID13, ID14, ID15 of the corresponding fitted sections 12, 13, 14, 15 being an amount which is just sufficient for the subsequent sections 13, 14, 15, 16 to pass down through the internal bore of the corresponding fitted section 12, 13, 14, 15. Preferably theaverage diametrical difference is less than W mm such that the outside diameter OD12 of the first section 12 can be as small as possible and is at mostequivalent to: OD12=(W x (n-1)+2x T x n)+ID16, where T is the average wall thickness of the casing sections 13, 14, 15, 16, ID 16 is the internal diameter of the last section, n is the number of casing sections and W is the average of the diametrical differences. The well casing ismade of continuous coiled tubing and W is less than 15 mm and greater than 0.1 mm. The well casing is made of joined tubing and W is less than 25 mm and greater than 1 mm.
Cette invention concerne un tubage de puits 11 formé d'au moins deux ensembles 12, 13, 14, 15, 16, le premier tronçon 12 à diamètre extérieur DE12 et diamètre intérieur DI12 étant disposé et cimenté en place au sommet du puits. Les autres tronçons 13, 14, 15 16 sont placés plus bas en succession, chacun ayant un diamètre extérieur DE13, DE14, DE15, DE16 et un diamètre intérieur DI13, DI14, DI15, DI16, les diamètres extérieurs DE13, DE14, DE15, DE16 des tronçons 13, 14, 15, 16 étant toujours inférieurs aux diamètres intérieurs DI12, DI13, DI14, DI15 des tronçons correspondants 13, 14, 15, 16 par une valeur telle que les tronçons suivants 13, 14, 15, 16 peuvent tout juste passer à l'intérieur des tronçons 12, 13, 14, 15 correspondants. De préférence, la différence de diamètre moyenne est inférieure à W mm de sorte que le diamètre extérieur DE12 du premier tronçon 12 puisse être le plus petit possible et au maximum égal à : DE12 =(W x (n-1)+2x T x n)+DI16, où T est l'épaisseur moyenne de paroi des tronçons 13, 14, 15, 16; DI16 est le diamètre intérieur du dernier tronçon; n le nombre de tronçons et W la moyenne des différences de diamètre. Le tubage du puits est fait de tube enroulé continu et W est inférieur à 15 mm et supérieur à 0,1 mm. Le tubage du puits est composé de tubes assemblés et W est inférieur à 25 mm et supérieur à 1 mm.
Gowling Lafleur Henderson Llp
Head Philip Frederick
LandOfFree
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