Wireline lubricator seals maintain pressure integrity in riser sections above the wellhead. These static or semi-static seals include O-rings, T-seals, or molded packers at connections. They isolate tool strings during makeup or pressure testing. HNBR or FKM compounds handle temperature extremes and chemical exposure. Proper lubrication prevents sticking during tool deployment https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/