Abstract: A frac plug has multiple conical-shape, radially outwardly expandable slip structures sandwiched between an actuator ring and a first ring. The smaller inner-diameter (ID) end of each slip structure extends into the larger ID end of the neighboring one. The actuator ring has a conical-shape portion extendable into the larger ID end of the neighboring slip structure. The first ring and actuator ring are movable towards each other to extend the conical-shape portion of the actuator ring into the neighboring slip structure thereby subsequently causing each slip structure extending its smaller ID end into the neighboring slip structure to expand the slip structure furthest to the actuator ring for engaging the slips thereon with a casing. The frac plug may comprise a seal element sandwiched between the actuator ring and a second ring, which are movable towards each other to compress and expand the seal element to engage the casing.

Abstract: A lubricator is provided which has a unitized body with at least one port in communication with the body's bore and its outer surface, to which port(s) connectors with different outer fittings for further connection to other equipment may be attached and sealed, and later detached and replaced with other connectors. The connectors may have different outer fittings or may be a plug or valve. This allows the connection of a single port to external equipment to be changed and the fitting for that external equipment's connection to be altered, without having to disconnect the lubricator from its well-head and stem or any of the lubricator's other connections.