Drilling following type acoustic logging device

Abstract

The embodiment of the invention relates to a drilling following type acoustic logging device. The device comprises a drill collar, a transmission energy converter and a receiving energy converter, wherein the transmission energy converter and the receiving energy converter are arranged on the drill collar; the transmission energy converter comprises a first radiation metal block, a first mass metal block and a plurality of transmission type piezoelectric ceramic sheets; the receiving energy converter comprises a second radiation metal block, a second mass metal block and a plurality of receiving type piezoelectric ceramic sheets. According to the device, a multi-pole-source working mode combining a single pole, a dipole and quadrupole is utilized to directly measure stratum longitudinal wave, transverse wav, stoneley wave sound velocity, attenuation and other parameters which can provide reference and verification for each other or individually processed, so that the reliability and applicable scope of the device can be greatly improved and expanded.

Description

technical field [0001] The invention relates to the technical field of acoustic velocity measurement, in particular to an acoustic logging device while drilling. Background technique [0002] In recent years, with the increasing demand for oil in the global industry, the drilling of highly deviated wells and horizontal wells has become increasingly 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 way. The sonic logging while drilling technology is one of the important methods in the logging while drilling technology, which has the characteristics of measuring while drilling. This technology uses the transmitting transducer installed on the drill collar to emit sound waves during the downhole drilling operation, propagates through the mud in the formation, and after a certain period of attenuation, the receiving transducer installed on the drill collar R...

AI Technical Summary

Problems solved by technology

Due to the complex and harsh special environment of acoustic logging while drilling, the design, manufacture and assembly of acoustic logging while drilling transducers are quite challenging

[0004] In the prior art, acoustic logging tools while drilling usually adopt monopole and dipole working modes. Monopole logging cannot obtain shear wave information in soft formations. Dipole is used as the sound source, and dipole waves and drill collar waves Easy to overlap, causing interference to dipole waves, unable to accurately measure formation information

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