Two-Piece Plunger with Sleeve and Spear for Plunger Lift System

摘要

A plunger lift system has a plunger with a sleeve and a spear that dispose in tubing. The sleeve and spear can move in the tubing between a bumper and a lubricator. The sleeve has a passage for fluid to pass therethrough, and the spear can insert partially into the sleeve's passage. The sleeve and spear fall independently of one another from the surface to the bumper. When disposed on the bumper, the sleeve and spear mate together. Building gas pressure downhole can then lift the mated sleeve and spear, which can sweep liquid along the tubing and push the liquid along with them to the surface.