Soundwave-while-drilling well logging device

Abstract

The invention relates to a soundwave-while-drilling well logging device, which comprises a drill collar and a transmission energy converter arranged on the drill collar, wherein the transmission energy converter comprises a first end socket metal block and a second end socket metal block which are arranged at two ends of the transmission energy converter, a metal splint positioned in the middle of the transmission energy converter and a plurality of piezoelectric ceramic wafers which are positioned between the first end socket metal block, the second end socket metal block and the metal splint respectively; the number of the piezoelectric ceramic wafers is even, the direction of polarization of each piezoelectric ceramic wafer is the thickness direction, and the directions of polarizationof the adjacent piezoelectric ceramic wafers are opposite; and the length direction of the transmission energy converter is perpendicular to that of the drill collar. The soundwave-while-drilling well logging device can judge information such as the velocity of longitudinal waves and transverse waves, porosity, pore pressure and the like of formations, particularly soft formations (the velocity of the transverse waves of the formations is less than sound velocity of fluid in a well), the velocity of the transverse waves of the formations can be measured by a quadrapole mode to perform the analysis of terrestrial stress, and thus, the integral function of the energy converter is expanded.

Description

technical field [0001] The invention relates to an acoustic logging device while drilling, in particular to an acoustic logging transducer combination while drilling. Background technique [0002] In recent years, as the global industry’s demand for oil has increased year by year, highly deviated wells and horizontal wells are very active in oil exploration, and logging-while-drilling technology has developed rapidly. Almost all open-hole wireline logging projects can use logging-while-drilling well logging method. The sonic logging while drilling technology is one of the important methods of the logging while drilling technology, which has the characteristics of measuring while drilling. This technology uses the transmitting acoustic wave transducer installed on the drill collar to generate sound waves during the downhole drilling operation, propagates through the mud in the formation, and after a certain period of attenuation, the receiving acoustic wave transducer instal...

AI Technical Summary

Problems solved by technology

The main disadvantages of the monopole and dipole measurement methods in the commonly used acoustic logging while drilling tools are: first, the dipole is used as the sound source, and there is serious drill collar wave interference in the received signal; There is a difference between the velocity of the formation bending wave and the velocity of the shear wave

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