System for pulse-injecting fluid into a borehole

Details System for pulse-injecting fluid into a borehole System for pulse-injecting fluid into a borehole

E - Fixed Constructions

21

B

E21B 34/06 (2006.01) E21B 33/068 (2006.01) E21B 34/10 (2006.01)

Patent

CA 2725328

For injecting e.g water into ground formation around a borehole, and for superimposing pulses onto the outflow of the injected water, it is important that the puses have a rapid rise-time. A piston is connected to a pulse-valve of the tool. A bias spring urges the piston towards its closed position. The piston is urged towards the open position by a differential PDAF between the supplied accumulator-pressure and the in-ground formation-pressure. When the pulse- valve is open, the PDAF is falling, until the force of the spring closes the pulse- valve. Then the PDAF rises, but now the PDAF acts over only a small area of the piston. When the PDAF is high enough to ease the pulse-valve open, suddenly the whole area of the piston is exposed to the PDAF, whereby the pulse-valve opens violently.

Pour injecter, par exemple de leau, dans une formation souterraine autour dun puits de forage, et pour superposer des impulsions sur lécoulement de sortie de leau injectée, il est important que les impulsions présentent un temps de montée rapide. Un piston est raccordé à une vanne à impulsion de loutil. Un ressort de sollicitation pousse le piston vers sa position fermée. Le piston est poussé vers la position ouverte par une PDAF différentielle entre la pression daccumulateur fournie et la pression de formation souterraine. Lorsque la vanne à impulsion est ouverte, la PDAF descend, jusquà ce que la force du ressort ferme la vanne à impulsion. Alors la PDAF monte, mais à présent la PDAF agit seulement sur une petite zone du piston. Lorsque la PDAF est suffisamment élevée pour ouvrir la vanne à impulsion facilement, la zone entière du piston est soudainement exposée à la PDAF, et la vanne à impulsion souvre violemment.

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