Investigation of OFDR monitoring for physical model experiments on deep saline reinjection

Deep well reinjection is one of the important methods for treating high-salt mine water in western China. Based on the geological conditions of the project site, a large-scale three-dimensional physical similarity model experiment was constructed to study and analyze the formation disturbance characteristics of the storage space under the conditions of two injection methods of vertical well continuous and vertical well intermittent. The results show that compared with continuous injection, the vertical well intermittent injection has a slightly smoother reservoir space disturbance, a longer influence time, but a smaller disturbance intensity. Through horizontal comparison at the same level, it is found that intermittent injection is better than continuous injection in the range of diffusion disturbance. The results of the model experiment can provide basic data for water depth reinjection and process optimization of high salt mines, and also provide technical support for the construction, coordinated mining and ecological environment protection of coal and mine water dual resource mines.