| 摘要 |
<p>A method and an apparatus for injecting a fluid into a borehole. The method includes the step of injecting an injection fluid into a primary injection zone at an injection fluid pressure. The primary injection zone is bounded by proximal and distal injection zone interfaces, which are maintained at pressures substantially balanced with the injection fluid pressure. The apparatus includes a body adapted for passage through a borehole, at least four radially extendable and retractable zone interface elements spaced along the body which when extended define at least three zones, a zone interface element actuator for selectively extending and retracting the elements and a fluid delivery system for delivering a fluid to each zone. The central zone defined by the elements is the primary injection zone. The zones on either side are balancing zones for achieving substantial pressure balancing with the fluid injection pressure at the interfaces.</p> |
