Abstract: Embodiments of well plunger systems, assemblies, and apparatuses are described. In an embodiment, the apparatus includes a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end, the channel for passing fluid from an oil or gas well. The apparatus may also include a receiver disposed at the first open end, the receiver configured to receive a stopper configured to at least partially seal off the channel, the first open end comprising a retention member receiver configured to receive one or more specially adapted retention members for applying a retention force to the stopper when the stopper is engaged with the receiver.

Abstract: Embodiments of well plunger systems, assemblies, and apparatuses are described. In an embodiment, the apparatus includes a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end, the channel for passing fluid from an oil or gas well. The apparatus may also include a receiver disposed at the first open end, the receiver configured to receive a stopper configured to at least partially seal off the channel, the first open end comprising a retention member receiver configured to receive one or more specially adapted retention members for applying a retention force to the stopper when the stopper is engaged with the receiver.

Abstract: Embodiments of well plunger systems, assemblies, and apparatuses are described. In an embodiment, the apparatus includes a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end, the channel for passing fluid from an oil or gas well. The apparatus may also include a receiver disposed at the first open end, the receiver configured to receive a stopper configured to at least partially seal off the channel, the first open end comprising a retention member receiver configured to receive one or more specially adapted retention members for applying a retention force to the stopper when the stopper is engaged with the receiver.

Abstract: Embodiments of well plunger systems, assemblies, and apparatuses are described. In an embodiment, the apparatus includes a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end, the channel for passing fluid from an oil or gas well. The apparatus may also include a receiver disposed at the first open end, the receiver configured to receive a stopper configured to at least partially seal off the channel, the first open end comprising a retention member receiver configured to receive one or more specially adapted retention members for applying a retention force to the stopper when the stopper is engaged with the receiver.

Abstract: Embodiments of an improved bypass dart and assembly are described. In an embodiment, the plunger assembly includes a plunger having a first and second end. The plunger assembly may also include a cage attached to the second end of the plunger. Additionally, the plunger assembly may include a dart disposed within said cage. Further, the assembly may include an actuator coupled to the dart, the actuator configured to actuate the dart from a first position to a second position.

Abstract: A plunger assembly for down-hole use in a well. In one embodiment, the plunger assembly comprises a plunger having a first and second end, a cage attached to the second end of the plunger, and a dart disposed within the cage having a body with at least two surfaces, where one surface is a raised surface relative to the other, lower surface.

Abstract: A bumper assembly for down-hole use in a well. In one embodiment, the bumper assembly includes a fish neck, a cage, and a progressive rate spring disposed there-between. When a plunger strikes the top of the fish neck, the progressive rate spring dampens the force delivered by the plunger, thereby prolonging the useful life of the plunger and/or the bumper assembly.