The screw pump can effectively reduce the cost of oil recovery and improve the efficiency of oil recovery. The diagnosis of the working condition of the screw pump includes the break off of the sucker rod, the serious leakage of the tubing, the serious leakage of the pump, the wax plugging, the stator of the rotor, the pump and the influence of the gas. If there is a problem of improper use or the quality of the product, there will be some failure. Because of the particularity of the oil extraction of the screw pump, the characteristics of various faults and the methods of diagnosis and treatment are different from those of other oil production equipment.

The data obtained by the screw pump separately use ammeter, torque tester, pressure gauge and liquid level detector are mainly analyzed manually, and the reliability of the analysis is poor. Some faults of screw pump well are difficult to diagnose accurately by one method. This requires another way to assist diagnosis, so as to improve the coincidence rate of fault diagnosis. The screw pump should use a set of high efficiency integrated testing instrument data instrument, which can simultaneously collect the working current, voltage, torque and well head pressure and liquid level data of the screw pump well, and the corresponding computer intelligent analysis software.

The intelligent comprehensive diagnostic tester for screw pump is composed of integrated test and collection system for working current, voltage, torque and wellhead pressure and liquid parameters, a comprehensive diagnosis software system for pump working condition and a matching computer system. The instrument adopts the motor current or power, rod torque, wellhead pressure and liquid level detector or sensor, and all the interface with the on-board computer, it realizes the multi parameter testing function integration, intelligent synchronization test and delay sampling, the original data information letter to obtain large quantity, high reliability, good correspondence. Can automatically compare the well casing pressure, oil pressure, back pressure through computer processing, the size of the data level conversion BHFP and given a number of curves to analyze the reasonable working condition of screw pump well, and directly make a diagnosis conclusion.

The design of the hardware system includes the structure design scheme and the circuit design scheme of the instrument. The hardware system will adopt advanced electrical machinery data electronic technology and sensor, and pay attention to the economy and reliability of the system, and optimize the combination of parameters.

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