Setting up a machine-collecting system and energy-saving equipment evaluation simulation well system, it achieves an evaluation analysis on energy-saving technology method which is used in pumping equipment (including motor, electricity-control cabinet, pumping unit) in different working system, and then choose a high-efficiency pumping equipment and build a reasonable working system, so that it can increase the efficiency of oilfield machine-collecting system. At last, it accomplishes its goal of energy saving and emission reduction.
By means of testing various pumping equipment, such as transformers, motors, control cabinets, pumping units etc. in different working system, analyzing running status of oil pumping system, testing and evaluating running efficiency of each link, it finds the best combination of system in different working conditions and the best control parameter in different configuration, which provides a basis for technical innovation of machine collecting ground equipment and provides a technical support for production guidance.
2. Main Functions
Measurement and control system includes sensor, transmitter, intelligent mode, transmission circuit, acquisition unit, acquisition software system and relevant attachments;
. Power test: Install electric energy test and harmonics test equipment on the input and output of control cabinet, then test all electric power input parameters of pumping unit, which is used to calculate the power consumption of e-control cabinet, operation efficiency of motor and system efficiency of oil pumping well.
. Output power test of motor: Torque & rotary speed sensor installed on motor output shaft of pumping unit tests the torque and rotary speed of motor output shaft, collect the receiver within the test room to which data wireless transfers. Via computer system, it displays and keeps torque, rotary speed and power cures of a complete stroke.
. Indicator diagram test: Via displacement and load sensor installed in donkey-head hanging rope in pumping unit, it tests the displacement and load changes in pumping unit donkey head, then transmission to computer system, and displays and keeps the changing curve of stroke length and stroke times in a complete stroke, and then draws a ground indicator diagram.
. Oil pressure and casing pressure test: When test, it needs to install oil pressure transmitter on oil pipe, and install casing pressure transmitter on casing pipe, then tests oil and casing pressure parameters. After test, unload the two transmitters. Oil and casing pressure signals are transferred to test room via wireless method.
. Motor voltage regulation: With the combination of cable and computer, the intelligent voltage regulator in test room adjusts voltage directly with remote control software;
. Computer-control system controls the collection method and sequence of various on-site physical quantity data; then amends collection data; calculates other parameters; displays and keeps all kinds of collected and calculated data; outputs the calculated, analyzed and evaluated results.
. Power parameter: Active power curve, reactive power curve, average active power curve, average reactive power curve, average power factor, three-phase peak current, three-phase current balance, peak active power, power balance, motor power using ratio, daily power consumption, hundred-meter active power consumption, etc.;
. Motor output power: Torque curve and rotary curve of motor output shaft, motor output power curve, average torque, average power and torque balance index of motor output, etc.;
. Indicator diagram: stroke length, stoke times, maximum load, minimum load, load using ratio, theoretical indicator diagram, polish rod power;
. Harmonics: each voltage harmonic proportion within 25 times, each current harmonic proportion within 25 times, voltage harmonic distortion rate, current harmonic distortion rate;
. Pump power figure diagnosis: Liquid column load, maximum theoretical load, pump stroke length, theoretical output volume of pump, pump efficiency, maximum and minimum load of poles at all levels, maximum and minimum stress of poles at all levels, use coefficient of sucker rod stress at all levels;
. Efficiency calculation: Motor efficiency, ground efficiency, downhole efficiency and system efficiency;
. System evaluation: Calculate control-cabinet active power-saving rate, reactive power-saving rate and comprehensive power-saving rate; power-factor increasing value, system efficiency increasing value; Evaluate indicators operation, including power factor, the balance of power and current, efficiency of machine-collecting system, distortion rate of total harmonic in control cabinet etc.
3. System configuration
. Notebook computer (running software included) and supporting peripherals;
. Testing system (including wired and wireless collection, transmission unit);
. Three-phase power test unit;
. Running control cabinet (various power switching mode);
. Supply voltage adjusting device (90kVA three-phase voltage regulator);
. Three-phase voltage stabilized supply (9kVA three-phase voltage stabilized supply);
. Mobile test room (6.5m×2.8m×2.5m);
. Wireless load/displacement transmitter;
. Oil pressure and casing pressure test unit; •Output rotary speed and torque test unit of motor;
. Torque and rotary speed collection unit.
4. Main Technical Parameters
|Test program||Program||Test range||Precision|
|Indicator diagram parameters||Pressure||0MPa~3MPa||0.5%|
|Voltage regulator||Input power||380V||0.5%|
|Power supply frequency||50Hz||15%|
|Output voltage||300V~430V||1 Hz|