The hydrogen - oxygen acoustic velocity logging device and logs the stratum the underground the manner

摘要

A hydrogen-oxygen acoustic logging device for generating acoustic waves for logging a subsurface formation when arranged in a borehole (21) through said formation. The device comprises an inflatable compartment (14), which contains water, electrodes and firing means, and which is electrically driven for electrolyzing water to a gaseous hydrogen-oxygen mixture thereby inflating said compartment (14) and for firing said gaseous mixture for generating said waves. The device comprises a housing, having an outer wall facing and closely fitting to a borehole wall portion, and being provided with a recess (13). Said recess (13) contains said inflatable compartment (14) and, when arranged in logging position against said borehole wall (22) portion, defines a substantially closed wave generating chamber. IMAGE