Cementing technology for Tianjin CGSD-01 geothermal survey well

Abstract:

CGSD-01 well is a deep hydrothermal geothermal resource survey well in Tianjin. For complex situations such as downhole circulation loss, active aquifers, selective cementing and long-term high temperature resistance, a set of cementing technology was developed for the well with use of the high-temperature-resistant anti-channeling cement slurry system, the olive-shaped cement basket, cement slurry injection through the liner on top of the screen pipe, and combination of direct injection and top reverse squeeze. Field application indicated there was no leakage and water channeling during the cementing process, and the cementation of the isolation layer was reliable, providing a demonstration for other deep geothermal wells in the area.