A radiation device for acoustic logging while drilling

Abstract

The invention provides a while-drilling acoustic logging radiation device, and belongs to the field of oil and gas drilling. The while-drilling acoustic logging radiation device comprises drill collarskeletons, emission piezoelectric vibrators, pressure-bearing shells and acoustic transmission protective covers. The drill collar skeletons are installing supports, emission piezoelectric vibrator installation grooves and pressure-bearing shell installation grooves are sequentially formed in the outer walls of the drill collar skeletons in the axial directions, and the emission piezoelectric vibrators are inlaid into the emission piezoelectric vibrator installation grooves in the circumferential directions; and the pressure-bearing shells are inlaid into the pressure-bearing shell installation grooves in the circumferential directions, the outer surfaces of the emission piezoelectric vibrators are covered with the acoustic transmission protective covers, and the acoustic transmission protective covers are fixed to the outer walls of the drill collar skeletons.

Description

technical field [0001] The invention belongs to the field of oil and gas drilling, and in particular relates to an acoustic logging radiation device for generating multiple wellbore pattern waves while drilling. Background technique [0002] Driven by the demand for oil and gas exploration and development of wells with complex structures such as highly deviated wells, horizontal wells, and multilateral wells, acoustic logging while drilling has developed rapidly in recent years, and has a tendency to gradually replace wireline acoustic logging. Acoustic logging while drilling arranges the transmitting and receiving transducers on the drill collar. During the drilling process, the formation parameters are directly obtained by measuring the acoustic information such as wave velocity and attenuation of various wellbore mode waves. Development provides important information. Acoustic logging while drilling completes the logging operation while drilling, which reduces the time o...

AI Technical Summary

Problems solved by technology

Although high-power broadband transmitters are widely used in existing wireline acoustic logging, they cannot be directly applied to acoustic logging while drilling due to structural size limitations.

Existing acoustic logging while drilling transmitters usually adopt cylindrical or arc-shaped structures, and are embedded in grooves or slots in drill collars, but such transmitters have narrow frequency bands, low electroacoustic conversion efficiency, The radiation power is small, and the signal-to-noise ratio of the obtained acoustic waveform is low

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