Downhole apparatus

Details Downhole apparatus Downhole apparatus

E - Fixed Constructions

21

B

E21B 21/10 (2006.01) E21B 4/02 (2006.01) E21B 7/18 (2006.01) E21B 7/24 (2006.01)

Patent

CA 2255065

Downhole flow pulsing apparatus comprises a housing (14) for location in a drillstring, the housing (14) defining a throughbore to permit passage of fluid through the housing. A valve (27,30) is located in the bore and defines a flow passage (29,31). The valve includes a valve member (27) which is movable to vary the area of the passage (29,31) to provide a varying fluid flow therethrough. A fluid actuated positive displacement motor (15,16) is associated with the valve member (27). In a preferred embodiment, the apparatus is provided in combination with a drill bit (5) and a pressure responsive device, such as a shock-sub (3), which expands or retracts in response to the varying drilling fluid pressure created by the varying flow passage area. The expansion or retraction of the shock-sub (3) provides a percussive effect at the drill bit.

Appareil de pulsation de flux en fond de trou qui comporte un carter (14) destiné à contenir un train de tiges de forage, ledit carter (14) définissant un trou traversant pour permettre le passage de fluides à travers lui. Un vanne (27, 30) est située dans le trou et définit un passage (29, 31) de flux. Elle comporte un élément vanne (27) qui peut se déplacer pour modifier la surface du passage (29, 31) afin de faire varier le flux de fluide à travers ladite vanne. Un moteur volumétrique (15, 16) actionné par fluide est associé à l'élément vanne (27). Dans un mode de réalisation préféré, ledit appareil est combiné à un trépan (5) et à un dispositif réagissant à la pression, tel qu'un amortisseur(3) de chocs qui se dilate ou se rétracte en réponse aux changements de pression du fluide de forage provoqués par les modifications de la surface du passage de flux. La dilatation ou la rétraction de l'amortisseur (3) de chocs entraîne un effet percutant au niveau du trépan.

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