Electric hydraulic driven pump systems are developed to provide effective operation of low-rate wells, including high viscosity conditions.
Electric hydraulic driven pump system consists of submersible electric motor, hydraulic drive and plunger pump. The hydraulic drive converts the rotary torque of electric motor to reciprocal movement, which is transferred to the plunger pump.
Electric hydraulic driven pump system features:
Long stripping of the hydraulic drive plunger reduces plunger and reversible valve strokes, decreasing thus wear of cylinders, plungers, rods, reversible valves and production pump valves.
The increased stripping of the plunger facilitates rising of compression index in the pump and improves output in conditions of HGOR. High compression index practically eliminates gas blocks.
Stripping of the hydraulic drive plunger at the end of the cycle softly slows down, reducing thus destructive fluid vibration.
The connection mechanism of the hydraulic cylinder rods allows operating of the installation in the deviated and twisted wells.
Technical Parameters:
Capacity, m3 /day.
13; 16; 25
Head, m
Up to 1800
Min. rated life, hours
10 000
Max. outside diameter, m
117
System length without motor, m
12
Temperature, max., °C
90
Min. efficiency
0,6
Parameter Test Results
Comparative characteristics of different reciprocal movement pump systems:
Parameter
Sucker rod pump
Electric hydraulic driven pump
Operating range, myday
1-125
5-20
Pump setting depth, max
1500
3500
Surface equipment
Sucker rod pump, Sucker rod pump, Switchboard
Switchboard
Transfer line (communication)
Rods
Cable
The "dead" zone in the plunger pump, m3
<1,5
0,15
Possibility of application in the deviated wells
Objectionable
Applied
Gas content
<10
>50
There is no analog of the suggested system in the world and there is no deficiency typical for other recovery mechanisms. There are certain deficiencies of sucker rod application for oil production, mainly, they are:
big weight and overall dimensions of ucker rod pump;
costs of construction-and-assembling orks of considerable volumes;
weak basement stability in conditions of the West Siberia;
