E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/20 (2006.01) E21B 34/10 (2006.01) E21B 21/00 (2006.01)
Patent
CA 2473372
Method and apparatus for drilling a well bore in a hydrocarbon formation using concentric coiled tubing drill string (03) having an inner coiled tubing string (01) and an outer coiled tubing string (02) defining an annulus (30) there between. A drilling means (04) comprising a reciprocating air hammer (80) and a drill bit (78), a positive displacement motor (05) and a reverse circulating drill bit, or a reverse circulating mud motor and a rotary drill bit, is provided at the lower end of the concentric coiled tubing drill string. Drilling medium is delivered through the annulus or inner coiled tubing string for operating the drilling means to form a borehole. Exhaust drilling medium comprising drilling medium, drilling cuttings and hydrocarbons are removed from the well bore by extraction through the other of the annulus or inner coiled tubing string.
L'invention concerne un procédé et un dispositif pour le percement d'un trou de forage dans une formation d'hydrocarbures, au moyen d'un train de forage concentrique à tube spiralé (03) constitué d'une colonne de production spiralée interne (01) et d'une colonne de production spiralée externe (02), entre lesquelles un annulaire (30) est défini. Un système de forage (04) à marteau pneumatique alternatif (80) et outil de forage (78), moteur volumétrique (05) et outil de forage de circulation inverse, ou moteur de circulation inverse pour la boue de forage et outil de forage rotatif, est mis en oeuvre à l'extrémité inférieure du train de forage concentrique à tube spiralé. Le fluide de forage est acheminé dans l'annulaire ou la colonne de production spiralée interne, pour l'exploitation du système de forage, permettant le percement du trou de forage. Le mélange à évacuer, qui comprend le fluide de forage, les débris de forage et les hydrocarbures, est extrait du trou de forage via l'annulaire ou la colonne de production spiralée interne.
Bennett Jones Llp
Presssol Ltd.
LandOfFree
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