invaded zone

invaded zone

[in′vād·əd ‚zōn]
(petroleum engineering)
Transitional downhole area between the area invaded completely by drilling mud and uncontaminated bulk of the reservoir.
References in periodicals archive ?
However, when nitrogen gas is more readily available, additional measures are available for engineers to use to ensure that the energized solutions adequately penetrate the invaded zone where extraction occurs.
Keeping ants off plant stems in invaded zones more than doubled the chances that a fruit would be bitten by a bird, O'Dowd and his colleagues report online September 15 in Biology Letters.