US 12,037,880 B2
Systems and methods for restarting downhole pump
Matthew Myers, Tulsa, OK (US); Noel Johney, Tulsa, OK (US); Tom Yohanan, Broken Arrow, OK (US); and Waylon David Whorton, Tulsa, OK (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Aug. 30, 2021, as Appl. No. 17/446,324.
Prior Publication US 2023/0066588 A1, Mar. 2, 2023
Int. Cl. E21B 43/12 (2006.01); F04D 13/06 (2006.01); F04D 15/00 (2006.01); H02P 6/06 (2006.01); H02P 27/04 (2016.01)
CPC E21B 43/128 (2013.01) [F04D 13/06 (2013.01); F04D 15/0066 (2013.01); H02P 6/06 (2013.01); H02P 27/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of restarting a downhole pump for pumping downhole fluid and located in a wellbore after operation of the downhole pump in a forward rotation has ceased, the method comprising:
determining a pump reverse rotational frequency of a downhole pump caused by downhole fluid flowing in a downhole direction to cause the downhole pump to rotate in a reverse rotational direction using a phase locked loop;
driving a pump motor at a motor reverse rotational frequency matching the pump reverse rotational frequency;
driving the pump motor to accelerate the pump reverse rotational frequency in the reverse rotation direction and thereby pump the downhole fluid in an uphole direction;
driving the pump motor to decrease the pump reverse rotational frequency while continuing to pump the downhole fluid in the uphole direction; and
driving the pump motor to change the rotation of the downhole pump to the forward rotation at a pump forward rotational frequency to pump the downhole fluid in the uphole direction.