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第三讲 冻结法凿井工艺 冻结法凿井工艺主要包括钻冻结孔(打钻)、冻结、井筒掘砌三大内容。其次,冻结站安装与打钻平行作业,收尾工程放在井筒掘砌完了进行。 一、打钻 1.钻孔布置 冻结法凿井中的钻孔就其用途可分冻结孔、水文观察孔和测温孔三种。 冻结孔数量多、要求垂直度高。冻结孔内安装冻结器,是地热和低温盐水的热交换器,冻结壁形成好坏全靠冻结孔的施工质量。冻结孔等距布置在与井筒同心的圆周上,圈径应视井筒净径、井壁厚度、冻结壁
Lecture 3 Freezing method Sinking process Freezing method Sinking process mainly includes drilling frozen hole (drilling), freezing, wellbore excavation three content. Second, the freezing station installation and drilling parallel operation, finishing work on the wellbore excavation finished. First, the drilling 1. Drilling arrangement Frozen method Drilling wells in its use can be frozen hole, hydrological observation hole and temperature hole three. Frozen hole number, requiring high verticality. Freezing hole to install the freezer, is a heat exchanger of geothermal and low temperature brine, frozen wall formation depends on the quality of construction of the frozen hole. The freezing holes are arranged equidistantly on the circumference concentric with the wellbore. The diameter of the freezing circle shall be taken as the diameter of the wellbore, the thickness of the wellbore, the thickness of the frozen wall