An apparatus and method for modifying the sidewalls of a...

E - Fixed Constructions – 21 – B

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E21B 7/00 (2006.01) E21B 7/04 (2006.01)

Patent

CA 2736399

The present invention concerns an apparatus (1) for modifying sidewalls of a borehole. The apparatus includes a longitudinal housing (2) adapted to fit inside the borehole. The housing includes a first end portion (11), a second end portion (12), and a side portion (13) between said end portions (11, 12), adapted to face the sidewalls of the borehole. Means (5) are provides on the side of the housing (2) for removing material from said borehole sidewall. The housing (2) is adapted to be rotated with a controlled rotational speed in relation to said borehole sidewalls and to be fed in a controlled rate of longitudinal motion in relation to said borehole. Furthermore, the invention relates to a method for making a borehole with internal, helical grooves.

La présente invention concerne un dispositif (1) pour modifier les parois latérales d'un trou de forage. Le dispositif comprend un boîtier longitudinal (2) adapté pour s'agencer à l'intérieur du trou de forage. Le boîtier comprend une première extrémité (11), une deuxième extrémité (12), et une partie latérale (13) entre lesdites extrémités (11, 12), adaptée pour faire face aux parois latérales du trou de forage. Des moyens (5) sont prévus sur le côté du boîtier (2) pour éliminer la matière desdites parois latérales du trou de forage. Le boîtier (2) est adapté pour être mis en rotation avec une vitesse de rotation commandée par rapport auxdites parois latérales du trou de forage et pour être amené à exécuter un degré commandé de mouvement longitudinal par rapport audit trou de forage. En outre, l'invention concerne un procédé pour former un trou de forage comportant des rainures internes hélicoïdales.

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