Centrifugal submersible pumps of ECPK type and electric pump units on their base are intended to complete the pumping units UECPK 16-3000 and UECPK 16-2000 used in oil-producing industry to maintain the strata pressure. They can be used with other purposes to delivering water and other liquids similar to water.
The pumps being a part of the pumping units are related to the items of aspect I (repairable ones) as per ГОСТ 27.003-90 and fabricated in climatic version U* GOST 15150-69 (for water applications).
The unit is not intended for servicing in explosion and-fire hazard productions. Performance parameters according to the fluids being pumped are given in table:
|Name of fluid||Fluid parameters||Rate|
|Mechanical admixtures, g/l, maximum||0,1|
|Hydrogen value ( рН )||5,4…9,0|
|Total dissolved salts, g/l, maximum||250|
|Density, kg/m3, maximum||1200|
|Temperature, К (оС), maximum:
for oil-filled motors
for water-filled motors
Hydrostatic head at the pump inlet is not less than 6 m.
The unit of ECPK type is a part of pumping unit consisting of downhole equipment and ground facilities.
Downhole equipment comprises the unit of ECPK type (pump,hydraulic protection, motor (oil-filled) or the pump and motor (water-filled) connected to ground facilities by the means of tubing string.
Ground facilities include: power cable, tubing head, transformer, complete device and check-and-measuring instruments (pressure gauges and so on.).
The pump of ECPK type – is the centrifugal, submersible, multistage machine consisting of sections or stage package.
The pump in the form of one or a few section elements is a stage package encased within the steel tube.
Also the pump can be presented in the form of stage package cluster, connected by tie studs. Every stage comprises the shell with guide vanes relieved of axial forces of the impeller and two seal rings of floating type.
The shaft with impellers and bushings make up the pump rotor which revolves in the rubber-metal bearings receiving the radial load. The residual axial load appearing due to the weight of liquid column within the oil well tubing is taken up by the axial bearing (axial support). The cooling and the lubrication of the said supports is carried out by the liquid being pumped.
Attachment of the pump to the driving part is effected by way of flanged joint. The torque from the shaft of the driving part to the pump shaft is transmitted by spline type coupling. The sense of rotor rotation – is the right-handed (clockwise, if viewed from the delivery side).
Electric motor – the oil-filled or water-filled motor (in accordance with the design of the pump), three-phase, induction squirrel-cage, submersible motor, with a synchronous frequency of rotation of the shaft of 50 s-1 (3000 rpm). The cooling of the electric motor is effected by stratum fluids. Additionally it is recommended to install the housing onto the motor which ensures the necessary flow rate of stratum fluids just along the motor.
For 1ECPK pump:
For 2ECPK type:
|Flow (nomin.), m³/h||125|
|Back pressure, m||6|
|Pump power input (max.), kW||175|
|Rotation speed, rpm||2850|
|Rotation speed, c˜¹||47.5|
|Type of current||AC|
|Number of stages||7|
For example 1ECPK 16-3000-200 U* TU 3631-116-05747979-97, where :