1、 From the two aspects of management and technology, the management is summarized as investigating the site, preparing the scheme and organizing the application, and the technology is summarized as site layout, drilling rig commissioning and pipe connection.
Variation refers to the sudden change of drilling trajectory, the sudden change of pullback force, the change of geological conditions, and the deformation of nearby structures exceeds the allowable control value.
back dragging construction VI.
7、 There are seven items in the textbook about the situation of stopping homework.
guide hole drilling IV.
Let’s sum it up.
8、 The pipeline quality inspection standard requires that the materials and construction shall comply with relevant national standards and design requirements…
Next, from the construction process of horizontal directional drilling, we will master the contents of the textbook from the following 8 aspects.
We remember them by the word “deterioration”.
Scope of application of horizontal directional drilling: there are many repeated contents in the textbook.
Bad refers to equipment damage and pipeline damage.
mud (liquid) preparation in order to stabilize the hole wall, reduce the pipe pulling resistance, prevent the pipe wall from abrasion and cool the bit, the mud (liquid) shall be injected into the hole in time during guide drilling, reaming and back dragging.
The construction of horizontal directional drilling is to use the horizontal directional drilling rig to drill a guide hole as accurately as possible according to the design curve; Then expand the guide hole, and drag the pipe (generally PE pipe, optical cable sleeve and steel pipe) back to the guide hole along the expanded guide hole to complete the pipeline crossing.
In addition, it contains collapse and shrinkage.
reaming and hole cleaning v.
2、 Guide hole trajectory design III.
