The dipole sonic far detecting logging tool utilizes the principle of catoptric imaging of dipole S-wave far field, and takes the dipole acoustic energy that radiates to the formation outside the well as the incident wave, and detects the sound field reflecting back from the well side holes, cracks and other acoustic impedance interface.    Compared with single pole P-wave catoptric imaging technology, the dipole S-wave far field catoptric imaging is featured with far detection depth, and could evaluate the position of reflection. The dipole sonic far detecting logging tool is equipped with all the functions that EXDT has, on such basis it is added with the measurement mode of dipole sonic far detection, and could be connected seamlessly with the ELIS logging system and ESCOOL high-speed transmission cable logging system that are researched and developed independently by COSL. 

Instrument Composition:

Acquisition short section (MA) + Sound Insulator (PA) + Excitation short section (FB) + Excitation circuit short section (FA)

Instrument Features:

l  Porosity evaluation, lithology judgment, gas layer Identification and permeability analysis

l  Formation strike judgment, formation rock anisotropy analysis, formation principal stress analysis;  

l  Formation interface, cracks, faults, karst cave and other structure judgment, reservoir evaluation

l  Farther detecting imaging depth: 30~70m (based on the formation)

l  With azimuth directivity: Image respectively for formation profile at different angles 

Application Conditions:

Wellbore diameter: 114 mm (4.5 in) to 533.4mm (21 in)