DOWNHOLE MOTORS HAVING ADJUSTABLE POWER UNITS

摘要

A downhole drilling motor (100) for well drilling operations includes a tubular housing (12) and a stator (120) disposed in the tubular housing. The stator (120) defines an internal cavity (134) passing therethrough, wherein the stator (120) includes one or more lobes (124) defming at least a portion of the cavity (134). A rotor 122 is operatively positioned in the internal cavity (134) to cooperate with the one or more lobes (124) of the stator (120). At least a portion of the stator (120) or of the rotor (122) comprises a memory material adapted to expand or contract when heat is applied by a localized heating module to the memory material. A fluid escape gap between the rotor (122) and stator (120) is adjusted by applying heat to the rotor and/or stator. At least one controller is adapted to receive input data and provide output signals increasing and/or decreasing electrical current applied to the at least one localized heating module.