Patent ID: 9045942
Filing Date: 2015-06-02
Classification: E21B

Abstract:
1. A downhole motor assembly comprising: (a) a housing extending longitudinally between a proximal assembly end of the motor assembly and a distal assembly end of the motor assembly; (b) a power section contained within the housing, wherein the power section is comprised of a stator and a rotor received within the stator, and wherein the rotor has a proximal rotor end and a distal rotor end; (c) a proximal drive assembly connected with the proximal rotor end, for rotation with the rotor, wherein the proximal drive assembly is comprised of a proximal shaft and a proximal drive connection located longitudinally between the proximal rotor end and the proximal shaft, and wherein the proximal drive connection assimilates a nutating movement of the rotor; (d) a distal drive assembly connected with the distal rotor end, for rotation with the rotor; (e) a proximal thrust bearing arranged between the housing and the proximal drive assembly, for transferring axial loads between the housing and the proximal drive assembly; (f) a distal thrust bearing arranged between the housing and the distal drive assembly, for transferring axial loads between the housing and the distal drive assembly; and (g) an axial load decoupling device in the distal drive assembly located longitudinally between the distal rotor end and the distal thrust bearing, for separating axial loads imposed on the proximal thrust bearing from axial loads imposed on the distal thrust bearing.