ISSN 1068-798X, Russian Engineering Research, 2017, Vol. 37, No. 7, pp. 579–580. © Allerton Press, Inc., 2017.
Original Russian Text © V.E. Brunman, A.S. Vataev, A.N. Volkov, M.Yu. Larin, O.N. Matsko, A.P. Petkova, D.G. Plotnikov, 2017, published in Vestnik Mashinostroeniya, 2017,
No. 4, pp. 24–25.
Improving the Energy Efficiency of Borehole Pumps
V. E. Brunman*, A. S. Vataev, A. N. Volkov, M. Yu. Larin, O. N. Matsko,
A. P. Petkova, and D. G. Plotnikov
St. Petersburg Polytechnic University, St. Petersburg, Russia
Abstract—To improve the energy efficiency of oil extraction, the control algorithms for sucker-rod borehole
pumps are optimized. Two control algorithms are developed for different operating conditions.
Keywords: sucker-rod borehole pumps, balanced mechanical drive, energy efficiency, control algorithms,
As a rule, sucker-rod borehole pumps are used in
boreholes of moderate productivity . In the oil
industry, balanced mechanical drives are employed,
with mechanical coupling of the balancing device to
the power element that moves the point of rod suspen-
The balanced drive of the rocker pump has signifi-
cant deficiencies: a complex trajectory of the point rod
suspension, which greatly increases the dynamic load
on the column; considerable mass and size of the
equipment; the need for a reinforced foundation; and
hence considerable expenditures of money and time in
In addition, it is difficult to provide power to the
borehole pumps on account of the long transmission
lines and the likelihood of considerable voltage fluctu-
ations . That considerably impairs oil extraction,
since the torque of the squirrel-cage induction motor
in the pump drives is proportional to the square of the
voltage. Therefore, the voltage drop slows or even
stops the drive. The motor control is predicated on
direct startup from the grid. With a long transmission
line, that reduces the supply voltage on account of the
considerable starting current (five times the rated cur-
Note also that the load on the motor changes con-
siderably over the pump’s operating cycle. Therefore,
it is important to increase the energy efficiency of oil
extraction by optimizing the design of the pump drive
and developing effective control algorithms for pump
operation with little energy consumption.
The pump drive may be optimized by using linear
rack drives, which are simple, highly reliable, easy to
install, and cheap to operate . However, the control
algorithms currently used for borehole pumps are far
CONTROL ALGORITHMS FOR GROUPS
OF BOREHOLE PUMPS
In the control of a group of borehole pumps, the
pump productivity and the flow rate of bed fluid in the
borehole are matched so as to ensure efficient power
consumption; and the system components are moni-
tored so as to prevent accidents. To create the corre-
sponding control algorithms, we must investigate the
power consumed and the productivity in different
operating conditions, in order to determine the energy
required for the equipment.
In constructing the model, we make the following
(1) All the pumps and their drives are the same.
The energy losses in the drives, the sucker-rod bore-
hole pumps, and the pump columns are identical.
(2) In the first half of the pump’s operating cycle, it
performs work; in the second half, it is idling (return-
ing to the initial state).
(3) For each pump, the length of the cycle will be
different, on account of the different borehole yields.
(4) The pumps consume the same power from the
common power source (power N) in the working
period. They consume no power in the idling period.
(5) In each cycle, the pumps extract the same vol-
ume of oil (V
(6) The productivity of a single pump is Q = V
The modeling program is written in the language C;
graphs are plotted using Microsoft Excel.
The operational efficiency (productivity) of the
system is assessed in terms of the ratio V/V
V is the volume of oil extracted in a given period, with
given energy consumption; V
is the volume of oil
extracted by the same system with maximum energy