大同地区干热岩勘查高温高压自喷井综合治理工艺

Comprehensive treatment technology for high temperature and high pressure blowing wells in hot dry rock exploration in Datong

摘要:

在大同天镇干热岩勘查项目中，当钻进至1622 m时，井内突然涌出大量高温高压气水混合物，这在干热岩钻井工作中极其罕见。针对这一中东部地区深部地热资源的重大发现，山西地勘局组织专家分析研究井口涌出情况，通过反复实践，利用方箱开合闸板实现引流，并进一步运用“下钻—注浆—降温—减压—压井—安装采油树”综合治理工艺，成功地完成了这眼地热井的保井发电试验任务。本文分析了自喷井形成原因，系统地总结了整个治理工艺过程，为今后同类型地热资源勘查钻探工作提供宝贵的经验和技术支撑。

Abstract:

In the hot dry rock exploration project in Tianzhen， Datong， a large amount of high temperature and high pressure gas-water mixture blew out of the well when drilling reached 1622m， which is extremely rare in the drilling of hot dry rock. In response to this major discovery of deep geothermal resources in the central and eastern region， the Shanxi Geological Prospecting Bureau organized experts to analyze and study the wellhead gushing situation. Through repeated practice， the square box was used to open and close the gate valve to achieve diversion with comprehensive treatment of “drilling-grouting-cooling-depressurizing-killing well-installing Christmas tree”. As a result， the geothermal well was successfully protected with power generation test completed. This paper analyzes the generation of the blowing well， and summarizes systematically the entire treatment process， providing valuable experience and technical support for future exploration and drilling for similar geothermal resources.