Method and apparatus for down-the-hole drilling

Details Method and apparatus for down-the-hole drilling Method and apparatus for down-the-hole drilling

E - Fixed Constructions

21

B

E21B 10/38 (2006.01) E21B 10/60 (2006.01) E21B 21/08 (2006.01)

Patent

CA 2737279

The invention relates to a method and apparatus for down--the- hole drilling, the drilling being carried out by an apparatus, having a drilling device (1) that comprises a casing part (2) and an essentially inside thereof existing drilling unit (3), at the drilling head of which there are at least first drilling means (4) for drilling a centre hole, second drilling means (5) for reaming the centre hole for the casing part (2) and a flushing flow arrangement (6) that comprises first flushing means (6a) for leading of a flushing medium onto a drilling surface (P) and second flushing means (6b) for returning of the flushing medium and drilling waste at least partly internally inside the casing part (2). The first drilling means (4) are removably coupled with the second drilling means (5) in order to enable removal thereof from the hole. The casing part (2) is arranged to be drawn into a hole to be drilled by the drilling unit (3). The flushing medium is be-ing brought onto the drilling surface (P) and returned therefrom by axially directed (s) flow arrangements (6a; 6a', 6b; 6b'), disposed in a cross-sec-tion view, on an outer periphery of the first drilling means (4) and/or in an inner periphery of the second drilling means (5).

L'invention concerne un procédé et un appareil de forage fond de trou, le forage étant réalisé au moyen d'un appareil, présentant un dispositif de forage (1) qui comprend une partie enveloppe (2) et une unité de forage existante (3) présente principalement à l'intérieur de cette dernière. Au niveau de la tête de forage de l'unité de forage se situent au moins des premiers moyens de forage (4) permettant de percer un trou central, des seconds moyens de forage (5) permettant d'aléser le trou central pour la partie enveloppe (2) et un agencement d'écoulement de rinçage (6) comprenant un premier moyen de rinçage (6a) servant à conduire un milieu de rinçage sur une surface de forage (P) et un second moyen de rinçage (6b) servant à renvoyer le milieu de rinçage et les résidus de forage au moins partiellement dans la partie enveloppe (2). Les premiers moyens de forage (4) sont accouplés aux seconds moyens de forage (5) afin de permettre leur retrait hors du trou. La partie enveloppe (2) est agencée de manière à être tirée dans un trou à forer par l'unité de forage (3). Le milieu de rinçage est amené sur la surface de forage (P) puis renvoyé de ladite surface de forage (P) par des agencements d'écoulement (6a; 6a', 6b; 6b') orientés axialement (s) qui, vus en section transversale, sont présents sur une périphérie externe des premiers moyens de forage (4) et/ou sur une périphérie interne des seconds moyens de forage (5).

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