Positive pressure release valve

Details Positive pressure release valve Positive pressure release valve

E - Fixed Constructions

21

B

E21B 21/10 (2006.01)

Patent

CA 2177088

In the oil industry, positive displacement motors are attached to the bottom hole assembly(BHA) mechanism to provide additional power to the bit. The motor is turned through the hydraulic force of the drilling fluids that are circulated within the drill string. However, once the bottom hole assembly becomes blocked, fluid can no longer circulate through the bit and back to surface. Serious problems arise as a result of this loss in circulation . In severe situations, this condition makes it possible to break off and lose the drilling pipe in the well bore. The need for a remotely activated release valve to restore circulation within the well is critical. The technical knowledge disclosed within this application relates to a mechanical device that is designed to release the fluid trapped inside the drilling pipe once the bottom hole assembly has become blocked, thereby restoring circulation.. The Positive Pressure Release Valve is activated through a increase in fluid pressure created by the surface pumps. Once a certain internal pipe pressure is achieved, the release valves are permanently released and circulation is restored within the pipe and well bore. The drill pipe is now in a position to be removed with minimal interruption and damage.

En exploitation pétrolière, il existe un procédé de forage dans lequel l'outil de forage est entraîné par une turbine placée entre celui-ci et le train de tiges et actionnée par la circulation des boues passant dans le train de tiges. Cependant, lorsque l'outil de forage grippe, les boues ne peuvent plus circuler dans celui-ci et remonter à la surface, ce qui cause de gros problèmes pouvant aller jusqu'à la rupture et à la perte de la tige de forage. Il faut donc que soit prévu un moyen commandé à distance pour rétablir la circulation des boues dans le forage. La présente invention concerne un dispositif mécanique permettant de rétablir la circulation des boues captives dans la tige de forage en cas de grippage de l'outil de forage. Ce mécanisme est actionné par la surpression des boues engendrée par les pompes de surface. Lorsque la pression à l'intérieur de la tige de forage atteint une valeur déterminée, les soupapes de décharge s'ouvrent et demeurent ouvertes, et la circulation se rétablit dans la tige de forage et le puits. La tige de forage peut alors être retirée avec le minimum de risques et de temps d'arrêt.

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