Free gas is the most common cause for low pump efficiency in sucker rod pumping wells. The installation of a gas anchor on the bottom of the downhole pump is a method used to help combat this problem. This paper describes improved gas anchor design for sucker rod pumping wells with gas problems. A computer program is described which will aid in the design of a gas anchor system and which evaluates pressure drops to determine the efficiency of the gas anchor.

The major parameters in gas anchor design are gas bubble velocity, diameter of the mud anchor, length of the dip tube, and the pressure drops associated with the gas anchor system. Validation of rules of thumb used in the past for gas anchor design is made. Gas bubble velocity of 0.5 ft/sec is a valid assumption if the API gravity of the liquid is greater than 300, the flow is turbulent and the temperature is greater than 100 OF. The principles behind the operation of an efficient gas anchor are presented with suggestions on how more efficient gas anchors may be designed by production engineers.

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