What are the common problems in the long distance horizontal directional drilling rig construction

 　　(1) During directional construction: the main problem is that it is difficult to control the direction of the drill pipe instability, and it is difficult to measure the drilling trajectory in real time.

　　(2) During the reaming construction: there are dangers such as "holding poles" and "collapsed holes".

　　(3) When the pipeline is towed back: Excessive drag of the drilling rig causes the pipeline to be easily damaged and deformed, and the foundation of the drilling rig may slip and lose stability when it is towed.

　　(4) Mud ratio problem: Mud is the blood that traverses horizontally and directionally. During long distance construction, there will be clay, silt, hard rock, gravel, silt, sand, etc. in the strata that the drill pipe will pass through. Therefore, the mud is required to have good rheology to ensure a strong ability to carry drill cuttings; it has a low coefficient of friction to ensure good lubrication performance; it has a strong wall protection effect and can form a certain mechanical strength mud on the hole wall. Skin, maintain the stability of the hole wall, and prevent mud leakage.

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