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 ?
Resistivity of the invaded zone or true resistivity (Rt) of the formation is calculated with the interpretation of LLD log data.
The Hyper Scratcher System is a multi-phase cleaning system that gives oil companies a cost-effective means of well stimulation by cleaning the immediate interface between the producing zone and the invaded zone without forcing fluid into formation and altering its permeability.
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.