New PDM motor improves performance, operating range

Growth of coiled tubing workover operations during the past decade has increased the demand for improved downhole motors for use in cleanout and milling operations.To meet that demand, engineers have developed a reduced-length positive displacement motor (PDM) with an "equidistant" power section stator designed to improve motor performance and reliability at higher operating temperatures. Conventional stator, Fig.1aClick here to enlarge imageThe new power section replaces the variable-thickness elastomer stator (Fig. 1a) with one manufactured primarily of a precision milled contoured internal steel stator surface, which is laminated with a thin, uniform-thickness layer of elastomer (Fig....

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