A horizontal directional drilling system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/04 (2006.01) E21B 4/14 (2006.01)

Patent

CA 2716909

rhe invention relates to a horizontal directional drilling system, comprising a dual string (1), said dual string (1) comprising an inner string (2), and an outer string (3), said inner string (2) is rotatable independently of said outer string (3), a first rotary drive system (4) to drive said inner string (2), a second rotary drive system (5) to drive said outer string (3), a frame (11) to movably support said rotary drive systems (4, 5), a front casing (7) fitted to a distal end of said outer string (3), a drive shaft (8) coaxially positioned into said front casing (7) and connected with said inner string (2) and a hammer (9) connected to said front casing (7) and operable in response to rotation of said drive shaft (8), said hammer (9) comprising a drill head (90) and a drill bit (91) wherein said drill head (90) generating percussive energy using pressurized fluid, e.g. pressurized air, supplied through an annular passage between said outer string (3) and said inner string (2).

L'invention porte sur un système de forage directionnel horizontal, comprenant un train de tiges double (1), ledit train de tiges double (1) comprenant une train de tiges interne (2) et une train de tiges externe (3), ledit train de tiges interne (2) étant apte à tourner indépendamment dudit train de tiges externe (3), un premier système d'entraînement en rotation (4) pour entraîner ledit train de tiges interne (2), un second système d'entraînement en rotation (5) pour entraîner ledit train de tiges externe (3), un cadre (11) pour supporter de façon mobile lesdits systèmes d'entraînement en rotation (4, 5), un tubage avant (7) ajusté à une extrémité distale dudit train de tiges externe (3), un arbre d'entraînement (8) positionné de manière coaxiale à l'intérieur dudit tubage avant (7) et relié audit train de tiges interne (2) et un marteau (9) relié audit tubage avant (7) et actionnable en réponse à la rotation dudit arbre d'entraînement (8), ledit marteau (9) comprenant une tête de forage (90) et un trépan (91), ladite tête de forage (90) générant une énergie percussive à l'aide d'un fluide pressurisé, par exemple de l'air pressurisé, distribué à travers un passage annulaire entre ledit train de tiges externe (3) et ledit train de tiges interne (2).

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