official – sensitive(британский гриф секретности: In a memo marked "official – sensitive", the agency states that it was urgently seeking the views of council chief executives and leaders to be fed directly into the Cabinet Office.theguardian.comAlex_Odeychuk)
limited entry perforation(Limited-entry strategy means choosing the perforation diameter and the number of perforations in every zone to create a certain pressure differential across the perforations, so that anticipated injection flow rate produces sufficient flow rate and fracture net pressure through each perforation to adequately stimulate every zone. Kenny Gray)
