Permanent underground ultrasonic scale removal and prevention device

Abstract

The invention discloses a permanent underground ultrasonic scale removal and prevention device. The device comprises a shell, wherein the shell is cylindrical; a central channel is formed in the central axis of the shell; a self-returning valve is arranged at the top opening of the central channel; an upper cavity and a lower cavity are formed between the shell and the central channel; a group ofliquid inlet holes are uniformly distributed in the top of the shell along the circumference; the liquid inlet holes communicate with the upper cavity; a group of liquid outlet holes which are uniformly distributed along the circumference are formed in the central channel at the bottom of the upper cavity; a flow guide turbine, a power generation turbine and tile-shaped magnetic steel are sequentially arranged in the upper cavity from top to bottom; a stator winding is arranged at a position, close to the excircle of the tile-shaped magnetic steel, in the lower cavity; and the stator winding is electrically connected with a power manager, a battery pack, an energy storage driver and a transducer which are positioned in the lower cavity in sequence. According to the device, power supply ofthe permanent underground ultrasonic scale removal and prevention device is realized by adopting an injected fluid self-power generation technology, so that the problem of power supply of an underground device is solved, the service life of the whole device is effectively prolonged, and the cost is reduced.

Description

technical field [0001] The invention relates to a permanently installed downhole ultrasonic descaling and antiscaling device, which belongs to the technical field of downhole instruments and downhole tools. Background technique [0002] In the middle and late stages of oilfield development, water flooding is usually used to enhance oil recovery and production. In order to reduce the cost of crude oil extraction, the oil field separates the oil and water produced by the oil well, and after simple treatment, the sewage is reinjected into the formation through the water injection well to supplement the energy of the formation. Since the injection water contains a large amount of Ca 2+ , Mg 2+ Plasma, affected by changes in external pressure, temperature and other factors, and CO3 2- , SO4 2- Negative ions react with each other to form crystals such as CaCO3 and MgCO3 that are insoluble in water, and deposit on the inner wall of the oil pipe to absorb sediment, dead oil and...

AI Technical Summary

Problems solved by technology

Since the injection water contains a large amount of Ca 2+ , Mg 2+ Plasma, affected by changes in external pressure, temperature and other factors, and CO3 2- , SO4 2- Negative ions react with each other to form crystals such as CaCO3 and MgCO3 that are insoluble in water, and deposit on the inner wall of the oil pipe to absorb sediment, dead oil and other impurities, forming a dense and strong scale layer, which seriously affects the accuracy of instrument testing and water injection. Development effect

Existing technologies use methods such as mechanical, chemical or coiled tubing hydraulic flushing to remove scale from the tubing. The above-mentioned scale removal and prevention methods all have disadvantages such as high cost of use, limited applicable conditions, and poor anti-fouling effect, which need further improvement

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