Investigation of salt precipitation dynamic in porous media by X-ray and Neutron dual-modality imaging

In this work, a new dual modality monitoring technique is presented to demonstrate its interest investigate the salt precipitation dynamics induced by gas flow-through drying. It consists of imaging simultaneously core flood using both Neutron and X-ray beams. A method calibrate process two signals presented. takes advantage difference in attenuation between ionizing radiations quantify different phase saturations compositions as well reduction porosity caused precipitation. set experiments has been conducted at NeXT-Grenoble beamline Institute Laue-Langevin facilities ( ILL , France). Experiments were on homogeneous rock sample Bentheimer sandstone dry nitrogen 100 g/L KBr brine. The first aimed for phases. last have with brine capillary contact maintained outlet. Experimental data given insights into organization three phases (the brine, gas, precipitated salt) when bank formed sample. These quantities computed dual-modality show great similarities published work. accumulation was used estimate flow rate pumped through compensate evaporation phase. Observations shown that initial some sections 12–14% enough trigger draw-down characterized migration toward inlet. conditions (low inlet pressure example), rise water could be fast form second higher observed formation spread less damaging configuration flow, triggering build-up withdrawal water. alternate until clogs.