A new term “Equivalent Gas Free Pump Fillage Line” represents the amount of liquid fillage inside the pump chamber when the traveling valve opens during the down stroke. Adjustments for gas in solution, slippage, free gas, and compressibility of liquid due to pressure and temperature are required to determine the amount of stock tank liquid produced per day for a selected stroke.
Field dynamometer data from eight different wells will be used to compare the calculated to measured surface oil and water production volumes. Equivalent gas free pump fillage line will be shown for each well’s representative pump card.
The pump card calculated gas produced up the tubing and the acoustic fluid level tested free gas produced up the tubing/casing annulus are used to determine system gas separation efficiency. This enhanced analysis technique allows answering many complicated questions concerning oil, water, and gas production with respect to the downhole pump card.