Patent ID: 6782946
Filing Date: 2004-08-31
Classification: E21B

Abstract:
An apparatus for injecting an injection fluid into a borehole, the apparatus comprising:(a) a body adapted for passage through the borehole such that an annular space is provided between an outer surface of the body and an inner surface of the borehole; (b) at least four radially extendable and retractable zone interface elements spaced longitudinally along the body, for filling the annular space between the outer surface of the body and the inner surface of the borehole when extended to define at least three zones along the body; (c) a zone interface element actuator associated with the zone interface elements for selectively extending and retracting the zone interface elements; and (d) a fluid delivery system associated with each zone for delivering a fluid to each zone from within the body; wherein the zone interface elements when extended permit the passage of the apparatus through the borehole while inhibiting the fluids from passing between zones.