Research and Test of the Drilling and Completion Technologies for Geothermal Reinjection Wells in Dongying Area

For geothermal water reinjection in sandstone thermal storage, the drilling and completion technologies for geothermal reinjection wells in Dongying Area of Shengli Oilfield were studied to ensure the sustainable development and utilization of geothermal resources. Based on the analysis of the geological characteristics of the thermal reservoir and the technical difficulties in drilling and completion of reinjection wells, drilling and perforation completion technologies were applied to a geothermal reinjection well. The technical research on BHA(bottomhole assembly), drilling fluid system and completion technology was carried out. The drilling and completion technologies for the geothermal reinjection wells was formed and successfully tested in the field. The field test showed that the layer of thermal reservoir of Well Tanguan 1 was located in the Guantao Formation in the Zhanhua Sag. The water temperature was 68 ℃, and the water volume was 90–105 m³/h with a reinjection volume of 90–105 m³/h, which achieved complete reinjection. The technologies have solved the technical problem in geothermal water reinjection in sandstone thermal storage, ensuring the healthy development of the geothermal energy industry in this area, thus possess the potential for widespread populariazation and application.