Dth-hammer drilling device and overburden drilling method

Details Dth-hammer drilling device and overburden drilling method Dth-hammer drilling device and overburden drilling method

E - Fixed Constructions

21

B

E21B 21/12 (2006.01) E21B 7/20 (2006.01) E21B 33/126 (2006.01)

Patent

CA 2654785

The invention relates to a DTH-hammer drilling device, comprising a down-the-hole- (DTH-) hammer (6) with a percussion drill bit (9), a drill pipe (2) with a waste conduit for the cuttings and at least one supply conduit for the flushing medium and a flushing medium supply device, wherein a seal (18) for sealing the borehole against the borehole opening is provided in a fixed distance from the drilling head (6), or wherein a casing tube (12) is connected to the drill bit (9). The invention further relates to an overburden drilling method, comprising rotating a drill bit (9), supplying an energy transfer medium through a drill pipe (2) to the rotating drill bit (9) for transmitting a percussive action thereonto, dragging a casing tube (12) along with the drill bit (9) and flushing away cuttings through the drill pipe (2).

Dispositif de forage en percussion dans le puits, comprenant un outil de percussion dans le puits (6) à foret de percussion (9), tige de forage à percussion (2) équipée d'un conduit d'évacuation des déchets pour les déchets de coupe et au moins d'un conduit d'alimentation de milieu de rinçage et d'un dispositif de fourniture de milieu de rinçage. Un joint (18) entre le puits et son ouverture est établi à une distance fixe de la tête de forage (6), ou bien un tubage (12) est relié au foret (9). On décrit aussi un procédé de forage de couverture qui consiste à mettre en rotation un foret (9), à fournir un milieu de transfert d'énergie via une tige de forage (2), à destination du foret (9), pour lui transmettre un mouvement de percussion, à étirer un tubage (12) le long du foret (9) et à rincer les déchets de coupe par la tige de forage (2).

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