System for pulse-injecting fluid into a borehole

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United States of America Patent

PATENT NO 8544552
APP PUB NO 20110036581A1
SERIAL NO

12989719

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Importance

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Abstract

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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 pulses 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.

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Patent Owner(s)

Patent OwnerAddress
WAVEFRONT RESERVOIR TECHNOLOGIES LTD26 CRANSTON AVENUE CAMBRIDGE ONTARIO N1T 1J8

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Davidson, Brett Charles Cambridge, CA 10 458

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