Drill tube for forming drill strings

Details Drill tube for forming drill strings Drill tube for forming drill strings

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2258164

In a first aspect the invention relates to a drill-string-forming drill tube which includes a channel (15) intended for passing flushing liquid, inside of which there is a restriction which forms a seat (14) for a valve body (16) serving as a check valve. Said drill tube comprises, in addition to a partly spherical skittle member (17) for engagement in the seat (14), two or more tangentially separated blocking elements (21). The purpose of said elements is, when flushing liquid is fed from the valve seat towards a second restriction distanced therefrom, to stop the valve body against said second restriction without sealing thereagainst. Therefore, one and the same drill tube may be used for upwardly directed as well as downwardly directed drilling. In a second aspect, the invention relates to the valve body as such.

Dans un premier aspect, l'invention concerne un tube de forage formant un train de tiges, lequel comprend un canal (15) destiné au passage de liquide d'évacuation, à l'intérieur duquel se trouve un étranglement formant un siège (14) destiné à un corps (16) de soupape servant de clapet de retenue. Ledit tube de forage comprend, outre un élément de quille (17) partiellement sphérique venant au contact du siège (14), au moins deux éléments de blocage (21) séparés tangentiellement. La raison d'être de ces éléments est, lorsque du liquide d'évacuation est acheminé du siège de soupape vers un second étranglement situé à une certaine distance de celui-ci, de stopper le corps de soupape contre ledit second étranglement sans former d'étanchéité contre ce dernier. Par conséquent, on peut utiliser un et même tube de forage pour un forage dirigé aussi bien vers le haut que vers le bas. Dans un second aspect, l'invention concerne le corps de soupape en tant que tel.

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