DOWNHOLE MOTOR COUPLING SYSTEMS AND METHODS

摘要

A drilling system includes a drillstring and a power section further including a stator having a stator axis and a rotor within the stator. The rotor rotates eccentrically within the stator in response to fluid flowing therebetween. Additionally, the system includes a coupling section including first, second, and third rotation members having a first, second, and third axes, respectively. The third rotation member is coupled to the first and second rotation members. The third rotation member is configured to move radially relative to the first and second rotation members as the first, second, and third rotation members rotate about the first, second, and third axes, respectively. Further, the system includes an input shaft coupled to the rotor and first rotation member. The input shaft and first rotation member rotate with the rotor eccentrically to the stator axis and the second rotation member rotates concentrically about the stator axis.

主权项

1. A downhole power generation assembly, comprising:
a generator; a first shaft coupled to the generator, wherein the first shaft has a first central axis, and wherein rotation of the first shaft is configured to drive the generator to produce power; a second shaft having a second central axis that is oriented parallel to the first central axis and radially offset from the first central axis, wherein the second shaft is configured to be coupled to an end of a rotor of a downhole motor; and a coupling section coupling the first shaft to the second shaft and configured to transfer rotational torque from the second shaft to the first shaft; wherein the coupling section includes:
a first rotation member coupled to the first shaft and coaxially aligned with the first central axis;a second rotation member coupled to the second shaft and coaxially aligned with the second central axis;a third rotation member axially positioned between the first rotation member and the second rotation member, wherein the third rotation member is coupled to the first rotation member and the second rotation member, and wherein the third rotation member has a third central axis oriented parallel to the first central axis and the second central axis; andwherein the third rotation member is configured move radially relative to the first rotation member and the second rotation member as each of the first rotation member, second rotation member, and third rotation member rotate about the first central axis, the second central axis, and the third central axis, respectively.