Method and assembly for abrasive jet drilling

Details Method and assembly for abrasive jet drilling Method and assembly for abrasive jet drilling

E - Fixed Constructions

21

B

E21B 7/18 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2682246

A method for operating an earth formation drilling device (1) arranged to supply a jet of abrasive fluid for the purpose of providing a borehole by removing earth formation material through abrasion, comprises a drill string and a drilling assembly connected to the drill string. Said drilling assembly comprises a jetting device with a mixing space (13), a drilling fluid, a particle inlet (12), an abrasive fluid outlet (40) for discharging a mixture of drilling fluid and magnetic particles, and a magnetic particle circulation system comprising a supporting surface which is exposed to a return stream along the drilling assembly. Furthermore, a magnetic device (9) is provided for attracting the magnetic particles onto the supporting. Said method is characterized buy the steps of : -fixing the magnetic device with respect to the supporting surface, -selecting a magnetic field density which increases along the sloping supporting surface towards, the entrance, -attracting magnetic particles onto the supporting surface under the influence of the fixed magnetic device, -making the magnetic particles move over the sloping supporting surface (under the influence of the magnetic field of the magnetic device.

Procédé pour faire fonctionner un dispositif de forage de formation terrestre agencé pour distribuer un jet de fluide abrasif et former un puits de forage par retrait par abrasion de la matière de formation terrestre. Ledit appareil comporte un train de tiges et un ensemble de forage relié au train de tiges. Ledit ensemble de forage comporte un dispositif d'éjection avec un espace de mélange, un fluide de forage, une entrée de particules, une sortie de fluide abrasif pour décharger un mélange de fluide de forage et de particules magnétiques, et un système de circulation de particules magnétiques comprenant une surface de support exposée à un courant de retour le long de l'ensemble de forage. En outre, un dispositif magnétique est disposé pour attirer les particules magnétiques sur la surface de support. Ledit procédé est caractérisé par les étapes consistant à : fixer le dispositif magnétique par rapport à la surface de support; sélectionner une densité de champ magnétique qui augmente le long de la surface de support en pente en direction de l'entrée; attirer les particules magnétiques sur la surface de support sous l'influence du dispositif magnétique fixé; amener les particules magnétiques à se déplacer sur la surface de support en pente (sous l'influence du champ magnétique du dispositif magnétique).

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