| Title | Practical Experience and Research in the Reinjection into Geothermal Reservoirs in Tianjin, China |
|---|---|
| Authors | Liancheng Wang |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | Geothermal reinjection, sandstone reservoir, temperature infection, impact factors, formation plugging |
| Abstract | Abstract Reinjection of the geothermal fluids after use is effective means for maintaining reservoir pressure which is the key to sustainable utilization of geothermal resources, which is also important environmentally way preventing surface disposal and pollution of surface waters. In Tianjin area, research regarding reinjection into geothermal reservoirs have been carried out since 1980s. Due to chemical scaling in wells and formation, plugging of aquifers and corrosion of casings, the reinjection rates into the sandstone reservoirs decreased dramatically with time. During the reinjection evaluation and research of the drilling techniques, filtering techniques and reinjection regulations. With the rapid economic development in Tianjin, geothermal utilization increased very quickly. As guarantee geothermal resources re-circulation of sustainable development of important means, great progress had been made in reinjecting return geothermal water into reservoirs in several different areas. Up to the end of 2024, there were 745 geothermal wells in Tianjin, therein 321 reinjection wells were drilled. Several demonstration projects of injecting into sandstone & basement reservoir were set up and the reinjection rates acquired great progress, up to 100-120m3/h into a single sandstone re-injection well, and the re-injection effect is much more better in the basement reinjection well. In this report, we describes reinjection issues from different perspectives including: reservoir configuration, aquifer characteristics, drilling techniques, filtering techniques, analysis combined with geothermal monitoring data, analyzes the conveyance speed as well as re-pumping at the interval of reinjection. We also describe the reinjection experience during the past decades in Tianjin China. |