This paper outlines three design modifications of the conventional power section of PDM operating on air. Theoretically, an increase in power output can be achieved by using motor power section with variable cross sectional area. The paper discusses the energy relationships for the various design modifications. Also the paper offers insights to the advantages and disadvantages of various designs.

Keywords:
upstream oil & gas, pressure ratio, design 3, design 4, positive displacement motor, theoretical analysis, variable cross section, horsepower, design modification, diameter
Copyright 2000, Society of Petroleum Engineers
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