天津CGSD-01地热调查井固井技术

Cementing technology for Tianjin CGSD-01 geothermal survey well

摘要:

CGSD-01井是天津地区的一口深层水热型地热资源调查井。针对井下漏失、水层活跃、选择性固井及长期耐高温等复杂情况，通过采用抗高温防窜水泥浆体系，优选橄榄型水泥伞，应用筛管顶部尾管注水泥和正注反挤固井工艺，综合形成一套适合该井的固井技术。通过现场应用，固井过程中未发生漏失及水窜，隔层封固可靠，为该地区深层地热井固井提供了示范。

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.