Acoustic response characteristics and sensitivity of briquette and raw coal under temperature and pressure control

Abstract

Acoustic testing is a widely used technique to measure the coal mechanical properties under high temperature and pressure in situ conditions. This study compared the acoustic wave characteristics of briquette and raw coal under various temperature and pressure conditions. The results show that the longitudinal wave velocity (V_p) decreases with an increasing vitrinite content. A large number of the vitrinite content enhances the process in which the temperature and pressure changed the V_p. The V_p of briquette decreases approximately linearly with the temperature compared to raw coal. The V_p of raw coal experiences initially a rapid, then gradual, and finally the moderate increasing trend with the increase in confining pressure. However, in briquette, the V_p increases approximately linearly with the confining pressure. The results indicate that the V_p is more sensitive to temperature under low confining pressure and peaks at 50°C−60°C than high confining pressure. However, the V_p is less sensitive to temperature under higher confining pressure, and the positive effect of high confining pressure is dominant. Understanding the mechanical properties of coal under high pressure and temperature develops better insight into coalbed methane (CBM) exploration from deep reservoirs.

Graphical abstract

Keywords

high-rank coal / P-wave velocity / temperature / pressure / microscopic components / sensitivity

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