Study on the law of Ultrasonic Wave Plugging

In the Chang Yuan area of Daqing oilfield, the field test of ultrasonic oil layer removal is carried out in the oil layer with different physical properties, different dynamic conditions and different water quality conditions. We evaluated the overall effect of ultrasonic remove near wellbore plugging, the system of technology parameters and reservoir static parameters, the dynamic parameters and quality of production of ultrasonic lift effect of near wellbore blockage, and ultrasonic, chemical plugging effect comparison. The test results show that the field parameters, static parameters of the reservoir and the dynamic parameters of production all affect the effect of ultrasonic plugging. The total processing time is longer, the better; layer selection priority Portuguese group two and senior group; under the same conditions, priority maximum permeability and small coefficient of variation, a small number of small, high strength injection layers; reservoir pollution, ultrasonic plugging treatment sooner the better. The initial injection efficiency of the two ways of chemical agent and ultrasonic wave is close, and the effective period of the plugging well is longer than that of acidizing well. Under the condition that the production cost of oil field is more and more precise, ultrasonic plugging and unmoving string, short construction time and long effective period can be used as a conventional plug removal method in oilfield application. (paper)