E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/00 (2006.01) E21B 4/02 (2006.01) E21B 4/20 (2006.01) E21B 7/28 (2006.01) E21B 44/00 (2006.01)
Patent
CA 2104010
The subject of the invention is an oil, gas or geothermal drilling rig comprising a central tool and a coaxial bit in which the central tool is driven Image by the rotor of a downhole motor powered by the drilling mud and in which the bit is driven, from the surface, by a drilling string that is part of a rotary system, the string subjecting the device to an axial force, characterized in that, between the stator (4) of the downhole motor and the shank (5) of the bit, there is a sliding link that allows the two tools to move axially relative to each other, and a spring (6) is positioned between the stator (4) and the shank (5) so that it is compressed by the stator when the central tool tends to lag behind the bit as they advance, in order to control the relative axial movement of the two tools and, in terms of that movement, to distribute the axial force to which the device is subjected. Application to the drilling equipment industry, mainly for oil, gas and geothermal drilling.
L'objet de l'invention est un appareil de forage pétrolier, gazier ou géothermique comportant un outil central et un trépan coaxiaux dans lequel l'outil central est entraîné par le rotor d'un moteur de fond alimenté par la boue de forage et dans lequel le trépan est entraîné, depuis la surface, par les tiges d'un train de forage appartenant à un système rotary, ces mêmes tiges soumettant l'appareil à un effort axial. Il est caractérisé en ce que, entre le stator (4) du moteur de fond et l'embase (5) du trépan, existe un liaison prismatique qui permet le déplacement axial relatif des deux outils et en ce qu'un ressort (6) est interposé entre le stator (4) et l'embase (5) de manière à être contraint par le stator quand l'outil central tend à prendre du retard par rapport au trépan dans leurs mouvements d'avance respectifs, afin de contrôler le déplacement axial relatif des deux outils et de répartir entre eux, en fonction de ce déplacement, l'effort axial auquel l'appareil est soumis. Application à l'industrie du matériel de forage notamment pétrolier, gazier ou géothermique.
Leroy Andre
Robic
LandOfFree
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