One way clutch train for arresting backspin

An electrical submersible pumping (“ESP”) system comprising:

• a driveshaft assembly that comprises elongated segments;
• an electrical motor coupled with an end of the driveshaft assembly, and that when energized rotates the driveshaft assembly in a first direction;
• a pump coupled with an end of the driveshaft assembly distal from the motor, one of the segments comprising a motor shaft and another one of the segments comprising a pump shaft having an end selectively coupled with an end of the motor shaft, and opposing ends of the pump and motor shafts being respectively coupled with the pump and motor,
• a one-way clutch train in the driveshaft assembly that is rotationally disengaged with the driveshaft assembly when the driveshaft assembly rotates in the first direction, and that is in rotationally engaged with the driveshaft assembly when the driveshaft assembly rotates in a second direction that is opposite to the first direction, and that comprises:
• a shaft-to-shaft clutch comprising an outer race on an outer surface of one of the segments, an inner race on an inner surface of an adjacent segment, and sprag type elements between the inner and outer races, the motor shaft comprises a receptacle that receives the end of the pump shaft distal from the pump and wherein the shaft-to-shaft clutch is disposed in the receptacle.

An electrical submersible pumping (“ESP”) system comprising:

• a housing;
• an electrical motor that when energized generates rotational force in a first direction;
• a pump;
• and
• a driveshaft assembly coupled between the motor and the pump and that comprises,
• a pump shaft having an end coupled with the pump,
• a motor shaft having an end coupled with the motor,
• a shaft-to-shaft clutch comprising,
• a first plurality of sprag type elements disposed in an annulus between the pump shaft and motor shaft, the first plurality of sprag type elements being changeable between a radial orientation in which opposing lateral edges of the sprag type elements are wedged between inner and outer races mounted respectfully on the pump shaft and motor shaft and a rotational torque is transferred between the pump shaft and motor shaft through the plurality of sprag type elements, and an oblique orientation in which the pump shaft and motor shaft are rotatable with respect to one another and pump shaft and motor shaft are each in selective sliding contact with the sprag type elements, and
• a shaft to housing clutch comprising,
• a second plurality of sprag type element disposed in an annulus between the pump shaft and housing the second plurality of sprag type elements being changeable between a radial orientation in which a rotational torque is transferred between the pump shaft and housing through the second plurality of sprag type elements, and an oblique orientation in which the pump shaft is rotatable with respect to the housing.

An electrical submersible pumping (“ESP”) system comprising:

• a housing;
• an electrical motor that when energized generates rotational force in a first direction;
• a pump;
• and
• a driveshaft assembly coupled between the motor and the pump and that comprises,
• a pump shaft having an end coupled with the pump,
• a motor shaft having an end coupled with the motor, and
• a shaft-to-shaft clutch comprising a plurality of sprag type elements disposed in an annulus between the pump shaft and motor shaft, the sprag type elements being changeable between a radial orientation in which a rotational torque is transferred between the pump shaft and motor shaft through the plurality of sprag type elements, and an oblique orientation in which the pump shaft and motor shaft are rotatable with respect to one another,
• wherein the pump shaft includes an axial passage, a port extending radially to an outer surface of the pump shaft from the passage, and an opening in the passage at a downhole end of the pump shaft, and wherein a magnetic sump is provided adjacent the opening, so that when the pump shaft rotates, a fluid flow is induced into the opening, through the passage, and out the port that receives thermal energy from the bearings, and wherein metal particles are pulled from the fluid flow and retained in the sump.