Plunger with flow passage and chamber

摘要

A chamber for use in plungers used in wells that produce liquids and/or gases under, which is connected to an internal flow passage to facilitate more rapid descent of the plunger to the well stop. A closure means is housed within the chamber, and is in the open position when the plunger descends down the tubulars. The closure means is actuated when the plunger and stopper stem reach the well stop. Once the closure means is seated, it is held in the closed position by the build up of pressure below the plunger. The invention also covers a plunger and a method of using the plunger.