Axial-vortex jet drilling system and method

E - Fixed Constructions – 21 – B

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E21B 7/18 (2006.01) E21B 10/60 (2006.01)

Patent

CA 2246689

A drill bit (10) with a housing (50) and roller cones (120a, 120b) has a high- speed fluid jet erosion system utilizing dual discharge, high-velocity, jet streams (171, 173) that is directed at the surface (22) to be eroded. The jet streams (171, 173) are developed from a dual discharge nozzle (160) adapted to form a first, swirling liquid jet (171) and a second, axial liquid jet (173) in combination therewith. When used in a shale-like formation, the bit (10) includes a nozzle (160c) in a bowl area (155) of the housing (50) that sends a vortex shaped spray (171) against the roller cones (120a, 120b).

Un trépan de forage (10), avec carter (50) et cônes à rouleaux (120a, 120b), possède un système d'érosion par jet de fluide à haute vitesse comprenant des courants-jets à haute vitesse et à double décharge (171, 173). Ce système est dirigé vers la surface (22) à éroder. Les courants-jets (171, 173) sont développés à partir d'un ajutage à double décharge (160) qui est conçu pour former un premier jet de liquide tourbillonnant (171) et un second jet de liquide axial (173) combiné au premier. Lorsqu'il est utilisé dans une formation schisteuse, le trépan (10) possède un ajutage (160c) monté dans une zone en forme de bol (155) du carter (50), cet ajutage (160c) projetant un jet pulvérisé tourbillonnaire (171) contre les cônes à rouleaux (120a, 120b).

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