Provided is a wellhead sealing device of a sucker-rod pumping machine, including a flexible connection unit, and further including a blowout prevention unit, a closing unit, a declination rectification unit and a lubrication unit, wherein the flexible connection unit is arranged between a wellhead and a packing box, and includes a lower flexible sealing sleeve (37), a lower flexible sealing sleeve housing (12), a sealing steel ring (11) and an upper flexible sealing sleeve (10). Portions above the flexible connection unit follow integrally a polished rod (7) constantly to swing, such that a packing (9) is dynamically coaxial with the polished rod (7) and the problem of eccentric wear of the packing can be completely solved. Furthermore, the device can also solve the problems of static coaxiality and lubrication between the polished rod (7) and the packing (9), as well as the problem of blowout prevention when the polished rod (7) is broken off.

A pump with a reservoir of a lubricant, including a hollow body in which a piston, loaded by a pressing element, sealingly slides, at least a port for loading the lubricant in a compartment defined by the inner wall of the hollow body and by the piston, and at least a valve for exhausting air trapped in the compartment together with the lubricant during a loading step.

A pump with a reservoir of a lubricant, including a hollow body in which a piston, loaded by a pressing element, sealingly slides, at least a port for loading the lubricant in a compartment defined by the inner wall of the hollow body and by the piston, and at least a valve for exhausting air trapped in the compartment together with the lubricant during a loading step.

A lubricant injector used for dispensing a preselected amount of grease when the grease is delivered to the injector in a pressurized condition, the lubricant injector includes a generally cylindrical body which includes an upper grease reservoir adapted to selectively receive grease from a lower grease reservoir, wherein both reservoirs are filled with grease, the body includes a lower grease inlet and an upper grease outlet, the body also includes an inlet and an outlet. It further includes a shuttling spool slid-ably housed axially within the body wherein the shuttling spool is adapted to move axially upwardly upon application of pressurized grease at the inlet, and axially downwardly when the grease is not pressurized at the inlet such that upon application of pressurized grease at the inlet the shuttling spool is urged axially upwardly toward the outlet and configured to close off grease communication between the upper and lower grease reservoirs and substantially simultaneously open the inlet for communication of a preselected amount of grease into the lower grease reservoir. The lubricant injector is configured such that upon the preselected amount of grease entering the lower grease reservoir, simultaneously an equivalent amount of grease is dispensed from the outlet of the upper grease reservoir, and during this operation the upper and lower grease reservoirs are isolated.

Aspects of the disclosure are directed to a system comprising: a lubrication applicator device that includes: a base having a cavity that is configured to store a lubricant, and a plunger that is configured to seat a head of a bolt in a counterbore of the base, where the plunger is axially movable in the cavity and is configured to be at least partially recessed in the cavity to cause a side of the bolt to be immersed in the lubricant.

Aspects of the disclosure are directed to a system comprising: a lubrication applicator device that includes: a base having a cavity that is configured to store a lubricant, and a plunger that is configured to seat a head of a bolt in a counterbore of the base, where the plunger is axially movable in the cavity and is configured to be at least partially recessed in the cavity to cause a side of the bolt to be immersed in the lubricant.

Provided is a wellhead sealing device of a sucker-rod pumping machine, including a flexible connection unit, and further including a blowout prevention unit, a closing unit, a declination rectification unit and a lubrication unit, wherein the flexible connection unit is arranged between a wellhead and a packing box, and includes a lower flexible sealing sleeve (37), a lower flexible sealing sleeve housing (12), a sealing steel ring (11) and an upper flexible sealing sleeve (10). Portions above the flexible connection unit follow integrally a polished rod (7) constantly to swing, such that a packing (9) is dynamically coaxial with the polished rod (7) and the problem of eccentric wear of the packing can be completely solved. Furthermore, the device can also solve the problems of static coaxiality and lubrication between the polished rod (7) and the packing (9), as well as the problem of blowout prevention when the polished rod (7) is broken off.

Aspects of the disclosure are directed to a system comprising: a lubrication applicator device that includes: a base having a cavity that is configured to store a lubricant, and a plunger that is configured to seat a head of a bolt in a counterbore of the base, where the plunger is axially movable in the cavity and is configured to be at least partially recessed in the cavity to cause a side of the bolt to be immersed in the lubricant.

Described herein are embodiments of apparatuses and methods that include an annular flow lubricator. In an exemplary embodiment, the annular flow lubricator includes a body housing an internal flow tube such that well flow enters a lower portion of the internal flow tube, travels up the internal flow tube, and exits an upper portion of the internal flow tube. Upon exiting the upper portion of the internal flow tube, well flow then travels in an annulus between the body of the lubricator and a wall of the internal flow tube before exiting an outlet port of the lubricator.

A cam follower assembly includes a shaft having a body defining a flanged head having an outer bearing surface extending therefrom. An outer ring is positioned around the shaft thereby forming an annular space there between. A plurality of rollers is positioned in the annular space. A channel extends through the shaft and branches radially outward at an outlet to communicate with the annular space. A lubrication assembly is positioned in the shaft and includes a pressurizing device located upstream of a lubrication reservoir and a metering device positioned downstream of the lubrication reservoir. The lubrication reservoir is in fluid communication with the outlet. The lubrication assembly includes a membrane positioned downstream of the lubrication reservoir. A piercing device is positioned proximate the membrane to pierce the membrane and release a lubricant from the lubrication reservoir.