Bottom Hole Assemblies
The bottom hole assembly of a plunger system will typically comprise of two components. The bumper spring, which is used to absorb the shock of the plunger falling from surface, and a hold down component. The hold down component is meant to keep the spring in place so it cannot travel up and down in the tubing string. This can be either seated in a nipple or landed inside of a tubing collar or the tubing itself with either a collar stop, tubing stop or cup assembly. The spring can also be designed to float in the lower tubing section.