Well reamer

Details Well reamer Well reamer

E - Fixed Constructions

21

B

E21B 7/28 (2006.01) E21B 10/32 (2006.01)

Patent

CA 2505412

The invention relates to drilling engineering, in particular to devices for enlarging the diameter of a hole within a specified range. The body of the inventive hole opener comprises radial orifices, a central through channel and a spring-loaded rod which is arranged in said channel and provided with orifices in the lower and top sections thereof. The top orifices are closed when the working members of the hole opener are in an operating position. Inclined slots are embodied on the external surface of the body and arms provided with pins are arranged therein. Said arms are arranged on supports with drilling cutters mounted thereon. Said supports are rigidly connected to cylindrical pistons which are arranged on the inclined borings of the body and whose cavities are connected to the central through channel thereof and tighten from environment. Said pistons are connected to the rod by means of sliders which are arranged in such a way that they are radially movable with respect to the rod and vertically movable along the slots of the body. Said invention increases the operating capacity and reliability of the opener.

L'invention concerne des équipements de forage et notamment des dispositifs pour augmenter le diamètre des trous de forage dans un intervalle déterminé. Le corps comprend trois orifices radiaux et un canal traversant central qui contient une tige précontrainte par ressort avec des orifices dans les parties supérieure et inférieure dont les dernières sont bloquées lorsque les organes de travail du détendeur sont en position de travail. A la surface extérieure du corps on a ménagé des fentes inclinées à l'intérieur desquelles on a fixé des pattes avec des griffes de commande montées dans des supports sur lesquels on a fixé des molettes. Les supports sont liés fixes aux pistons cylindriques disposés dans les alésages inclinés dans le corps dont les cavités communiquent avec le canal de passage central et sont isolées étanches de l'environnement. Les pistons sont reliés à la tige par des coulisseaux. Les coulisseaux peuvent se déplacer radialement par rapport à la tige et verticalement dans les logements du corps. L'invention permet d'augmenter le rendement et la fiabilité du détendeur.

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