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Overcoming Challenges in Ultra-Long-Distance HDD

What are the common problems of ultra-long-distance horizontal directional drilling when crossing pipelines?

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

(2) During the reaming construction: there are dangers such as “holding pole” and “collapsed hole”.

(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 blood that traverses horizontally. During long-distance construction, there will be clay, silt, hard rocks, gravel, silt, sand, etc. 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.

hdd machine
hdd machine

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