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一、井管偏斜的原因(一)基本因素1.井孔偏斜。井管外砾料厚度不均,甚至有的井管紧擦孔壁;2.天车、井管、井孔不同心,井管不在井孔中心;3.深机井,采用钢丝绳托盘下管,不易保证井管垂直;4.用钻杆托盘下管,没有在钻杆上间隔安装内扶正器。(二)托盘方面1.托盘与托盘颈焊接不正;反螺纹接头在托盘颈上焊接不正;2.托盘下的导正装置(找中器)与托盘不同心;3.托盘上的导向管或钢筋(固定井管用)焊接钩与托盘不垂直或不同心;导向管或钢筋形成圆的内径比井管
First, the well tube deflection causes (a) the basic factors 1. well bore deviation. Well tube gravel thickness unevenness, and even some well tube wall friction tight; 2. Crane, well tube, well bore different heart, well tube is not in the center of the well; 3. Deep wells, the use of wire rope tray under the tube, Not easy to ensure the vertical well tube; 4. With the drill pipe under the tube, not in the drill pipe installation of internal centralizer interval. (B) the tray aspects 1. Tray and tray neck welding is not correct; anti-threaded joints welded on the neck of the tray is not correct; 2. Under the tray guide device (finder) and the tray is not in the heart; 3. Tray on the guide tube or Reinforced (fixed well pipe) welding hook and the tray is not vertical or not the same; guide pipe or steel to form a round of the diameter than the well