Wireline seals for coiled tubing conveyed operations use tandem packoffs. The upper seal handles tubing movement while the lower seal contains well pressure. Grease is injected between the seals to reduce friction on the cable. These seals enable logging while tractoring in highly deviated wells. They provide data acquisition in complex trajectories where conventional wireline cannot ... https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/