Pressure converter (b)

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/00 (2006.01) E21B 7/18 (2006.01) F15B 3/00 (2006.01)

Patent

CA 2216916

Pressure converter for mounting above the drill bit at the lower end of a drill pipe for generating a higher fluid pressure in a portion of a drilling fluid flow, comprising a piston (6) being moveable in a cylinder (1, 2, 3). The piston has a large piston area (11) which when moved in a first direction is affected by the pressure of the drilling fluid in the drill pipe (10), and an opposite small piston area (12) which when moved in the first direction provides an increased pressure in a smaller portion of the drilling fluid flow. Valve means (4) controls the movement of the piston in the cylinder (1, 2, 3). Conduits (31, 32) communicate with drilling fluid flow passages inside the drill pipe (10) and the annulus (50) outside the drill pipe (10) respectively. The space in front of the small piston area (12, 14) is adapted to receive a particular working fluid and there is provided a moveable membrane (12B, 14B) so as to separate the working fluid from the drilling fluid.

La présente invention concerne un convertisseur de pression se montant au-dessus du trépan à l'extrémité inférieure d'une tige de forage pour relever la pression de boue au niveau d'une partie de la circulation de boue de forage. Ce convertisseur comporte un piston (6) mobile dans un cylindre (1, 2, 3) et présentant une grande surface (11) qui réagit dans un premier sens à l'effet de la pression de la boue de forage de la tige de forage (10) ainsi qu'une petite surface en opposition (12) qui, lorsqu'elle est mue dans le premier sens, délivre une pression accrue dans une partie plus petite du circuit de boue de forage. Une vanne (4) assure la régulation du déplacement du piston dans le cylindre (1, 2, 3). Des conduits (31, 32) communiquent, l'un avec des passages de circulation de boue de forage à l'intérieur de la tige de forage (10), et l'autre avec l'espace annulaire (50) extérieur de la tige de forage (10). Le volume situé devant la petite surface de piston (12, 14) est destiné à accueillir un fluide de travail spécifique, une membrane mobile (12B, 14B) permettant de séparer ce fluide de travail de la boue de forage.

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