Injection of liquid into boreholes, with suckback pulsing

Details Injection of liquid into boreholes, with suckback pulsing Injection of liquid into boreholes, with suckback pulsing

E - Fixed Constructions

21

B

E21B 43/16 (2006.01) C09K 8/00 (2006.01)

Patent

CA 2738052

When injecting liquids into the ground, imposing pulses on the injected liquid is effective to increase penetration and saturation of the ground. Imposing suckback onto the pulses is effective to make the liquid in the ground behave as a coherent unitary body, surging out and back each pulse, and to super-saturate the ground. The tool includes a sucback-chamber, which is timed to open to the ground formation just as the pulse-valve closes. A biasser (e.g a spring) drives the chamber open and sucks in some of the liquid from the ground. The chamber is then emptied, back to the ground, by the rising pressure as the pulsing tool is recharged. The suckback- chamber can be added to any type of pulsing tool.

Selon l'invention, lorsqu'un liquide est injecté dans le sol, l'application d'impulsions sur le liquide injecté permet d'améliorer la pénétration et la saturation du sol. L'application de rétrosuction sur les impulsions permet d'obtenir que le liquide se comporte dans le sol comme un corps unitaire cohérent, pompé en avant et en arrière à chaque impulsion, et de supersaturer le sol. L'outil comprend une chambre de rétrosuction temporisée pour s'ouvrir sur la formation de sol à mesure que la vanne à impulsions se ferme. Un élément de sollicitation (un ressort, par exemple) entraîne l'ouverture de la chambre et aspire du sol une partie du liquide. La chambre est ensuite vidée, le liquide renvoyé vers le sol, par augmentation de pression à mesure que l'outil à impulsions est rechargé. Cette chambre de rétrosuction peut être ajoutée à n'importe quel type d'outil à impulsions.

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