世界核地质科学2024，Vol.41Issue(1)：117-128,12.DOI:10.3969/j.issn.1672-0636.2024.01.011
西藏谷露地热田ZK401高温地热井钻井工艺技术
Drilling technology of ZK401 high temperature geothermal well in Gulu geothermal field,Xizang
吴儒杰 1郑冉 2张松 1万汉平 1郝伟林 1唐伟军 1张健1
作者信息
- 1. 核工业北京地质研究院,北京 100029||中核集团地热勘查技术研究中心,北京 100029
- 2. 西藏自治区土地矿权交易和资源储量评审中心,西藏 拉萨 850011
- 折叠
摘要
Abstract
The Gulu geothermal field is a typical hydrothermal high temperature geothermal field in the Naqu-Nimu geothermal belt of Xizang.The safe,economical,and efficient drilling technology largely determines the potential for the development and utilization of its high-temperature geothermal resources.ZK401 well is a high-quality and high-yield exploration and production combined well implemented in the Gulu geothermal field.The rock is mainly composed of granite,which has high rock hardness,low mechanical drilling speed,and short drill bit service life.Multiple layers of thermal storage were exposed from top to bottom,and the medium temperature geothermal fluid of 124.8℃was exposed from depth 35 to 41 m,and the total amount of steam and water is about 40 t·h-1.The medium temperature thermal storage of more than 120℃was exposed at the depth of 50 to 320 m,and the total amount of steam and water is about 30 to 35 t·h-1.320 to 1 320 meters exposed 186.9℃high-temperature thermal storage,with a total amount of steam and water of up to 348 t·h-1.It has the characteristics of shallow thermal storage depth,high temperature,developed fault structures,and large formation water output.High temperature and water invasion can easily cause drilling fluid failure,high risk of blowout,and difficulty in safe drilling.In order to solve the above difficulties in drilling construction,the key technologies of high-temperature geothermal drilling were studied.Through the use of special-shaped PDC bit and rock thermal cracking technology,the penetration of a single special-shaped PDC bit was increased by 23%～48%compared with the same size cone bit,and the average mechanical drilling speed of the granite in the third drilling has been increased to 3.18 m·h-1.By optimizing the wellbore structure,adopting simple pressure control drilling technology,and using low-temperature clean water as as circulating drilling fluid for second and third drilling,the purpose of timely discovering and effective protection of thermal reservoirs and control of blowout risks has been achieved.The ZK401 well has achieved safe and continuous drilling under harsh conditions of exposing 186.9℃high-temperature thermal storage at 520 m and a total steam and water of 348 t·h-1.The non production time has been shortened by 37%compared to adjacent wells using conventional drilling techniques,which greatly reduced drilling costs and improved the potential for the development and utilization of high-temperature geothermal resources,this provide reference for solving the drilling construction of high-temperature geothermal wells in the region and even other regions in the future.关键词
谷露地热田/钻井工艺/简易控压钻井/高温地热井/井喷Key words
Gulu geothermal field/drilling technology/simple press-control well drilling/high-temperature geothermal well/blowout分类
天文与地球科学引用本文复制引用
吴儒杰,郑冉,张松,万汉平,郝伟林,唐伟军,张健..西藏谷露地热田ZK401高温地热井钻井工艺技术[J].世界核地质科学,2024,41(1):117-128,12.
