地热钻井中录井及各地层界面的判定方法探讨——以天津市东丽区民和巷DL-81地热井为例

Discussion on the ways to predicate stratum and well logging in well drilling:an example of DL-81 geothermal well in Dongli district Mehe Lane, Tianjin city

地质录井是地热钻井中的一项重要工作。在地热钻井中,经常由于地质工作不到位,产生工程事故,影响成井进度,造成经济损失。东丽区民和巷DL-81地热井井深3 200 m,自上而下揭露地层比较完整,钻遇了地热钻井中多个较重要的地层界面。本文结合该地热井施工过程,阐述了通过岩屑录井、观察钻时变化、物探测井、记录钻井液漏失等地质录井工作,准确判定地层界面,及时有效地采取相应工序,来防止工程风险,为顺利成井做好地质上的保障工作。本文对天津及周边地区类似地热钻井的施工有一定的实际借鉴意义。

Well logging is one of the important jobs in geothermal well drilling. During the process of the drilling,due to geological work not in place, the engineering accidents often take place resulting in economic losses. In the Dongli district Minhe lane, Tianjin city, DL-81 geothermal well depth reaches 3200 m, from top to bottom to expose the sedimentary formation relative completely, and it drilled through more important geological interface.In this paper, we discus how to make use the ways like penetration time logging, geophysical logging and drilling fluid logging etc.to predicate the drilling stratum, prevent the well drilling dangers effectively,and do well on the geological security work smoothly. This paper has the certain actual reference for similar geothermal drilling in Tianjin and the surrounding area.