A method (1A-1BU) of providing or enabling (211-219) restoration of cap rock of at least a portion (4A-4BU) of a producible zone of a subterranean well penetrating said cap rock, the method comprising the steps of and being characterized by : placing and supporting at least one cement equivalent well barrier member (3A-3BU, 20, 216) within an operable usable space that is formed by at least one cable operable and rigless string operable, annulus engagable member (2A-2BU) comprising components that are cable and rig-less string conveyable through an innermost passageway surrounded by at least one annulus of a plurality of annuli formed by installed concentric conduits extending downward from a wellhead within subterranean strata for forming a plurality of passageways in fluid communication with said producible zones through said cap rock; using energy conductible through said rig-less string or through movable fluid of a circulatable fluid column within said plurality of passageways to operate said at least one cable operable and rig-less string operable annulus engageable member; and using said at least one cable operable and rig-less string operable annulus engagable member to riglessly access said at least one annulus from said innermost passageway, displace at least one portion of a wall of at least one conduit about said innermost passageway to provide an operable space, bridge across said operable space, and place said at least one cement equivalent well barrier member through said operable space adjacent to said cap rock to form at least one geologic time-frame space usable to fluidly isolate said at least one portion of said subterranean well without removing said installed concentric conduits and associated debris from below one or more subterranean depths of associated capping rock to provide or enable said restoration of said cap rock above, wherein said cement equivalent barrier is supported at said subterranean depth adjacent to said cap rock. placing and supporting at least one cement equivalent well barrier member (3A-3BU, 20, 216) within an operable usable space that is formed by at least one cable operable and rigless string operable, annulus engagable member (2A-2BU) comprising components that are cable and rig-less string conveyable through an innermost passageway surrounded by at least one annulus of a plurality of annuli formed by installed concentric conduits extending downward from a wellhead within subterranean strata for forming a plurality of passageways in fluid communication with said producible zones through said cap rock; using energy conductible through said rig-less string or through movable fluid of a circulatable fluid column within said plurality of passageways to operate said at least one cable operable and rig-less string operable annulus engageable member; and using said at least one cable operable and rig-less string operable annulus engagable member to riglessly access said at least one annulus from said innermost passageway, displace at least one portion of a wall of at least one conduit about said innermost passageway to provide an operable space, bridge across said operable space, and place said at least one cement equivalent well barrier member through said operable space adjacent to said cap rock to form at least one geologic time-frame space usable to fluidly isolate said at least one portion of said subterranean well without removing said installed concentric conduits and associated debris from below one or more subterranean depths of associated capping rock to provide or enable said restoration of said cap rock above, wherein said cement equivalent barrier is supported at said subterranean depth adjacent to said cap rock. <EOS>