Research On 150? ESP Working Condition Monitoring Technique

Working condition monitoring technique of electrical submersible pump(ESP) could monitor the production parameters of the well and operational parameters of ESP in real time, this technique could let the user of the oil field comprehend the production and running status of the well and oil recovery equipment. On the one hand, it could monitor and control the running of the ESP efficiently, on the other hand, by adjusting production parameters, it could optimize recovery scheme, improve the efficiency of oil exploitation, finally to achieve rational exploitation.In recent years, some of the domestic enterprises and university research on 125? ESP running condition monitoring technique. Among of them, the 125? temperature level production cooperatively developed by HIT and Powerlift Pump Industry CO,.LTD is now in its intermediate testing step, other productions now are concept researching step. By additional exploration the oil and gas, more deep well and high temperature well appear, the well temperature of some wells in parts of Indonesia, Sudan, Middle East, Xinjiang oil fields have exceed 125?, the technique now available could not meet requirements of high temperature well development, the domestic 150? level is now vacancy. The application of the 150 ? level products are depending on import. Therefore, this paper goes into the researching on 150? ESP running working condition monitoring technique, to achieve the real time monitoring of deep well and high temperature well.The 150? ESP working condition monitoring system designed in the paper could monitor seven parameters down-hole, they are intake pressure, discharge pressure, formation temperature, motor temperature, X-axis vibration, Y-axis vibration and current leakage. The system could divide into down-hole primary instrument and surface secondary instrument.Descent down hole with ESP, down-hole primary instrument measure the parameters down hole and transmit them to surface secondary instrument. Down-hole primary instrument includes power circuit, parameter detecting circuit, signal conditioning circuit, time-sharing circuit and signal transmit circuit. The power source down hole uses fly-back structure, selects nanocrystalline material as the core of transformer. High temperature and high precision sensors is chosen for parameter detecting circuit. The signal conditioning circuit is designed under the demand of current loop transfer. The signals are sampled and transferred under the control of MCU time-sharing circuit. After that, voltage signals will be transferred to current signals through the V-I conversion circuit, and then transmitted to the surface secondary instrument.Surface secondary instrument supplies power to down hole unit through Y-Point DC power supply method, it can also process and display the data from down hole, complete interactive operation. It includes power source, main control board and MCGS touch screen. The heart control chip is LPC2378, which could control power supply periodically, A/D sampling, data display, relaying and data storage etc. through the cooperation of hardware and software. MCGS touch screen can realize the functions of running monitoring, p arameters curve, warning/protection point setting etc. through interface design of touch screen, which could show the data from touch screen and main board.