1. Reduce the time of tripping and drilling. It is about 5-10 times faster to use a wire rope to lift and change the drill bit than a traditional drill rod;
2. Save the cost of procurement, transportation, inspection, maintenance, and replacement related to drill pipes and drill collars;
3. Because there is always a casing in the well-born, there is no longer a pumping effect on the wellbore when the drill pipe is pulled down so that the good control situation is improved;
4. Eliminate the swabbing effect and pressure pulsation caused by lowering the drill pipe;
5. The continuous mud circulation can be maintained when the drill bit is lifted with the wire rope, which can prevent the accumulation of drill cuttings and reduce the occurrence of well kick;
6. Improved the annulus up and down speed and the condition of cleaning well-born. When the mud is pumped into the casing, the inner diameter is larger than that of the drill pipe, which reduces the hydraulic loss, thereby reducing the power of the drilling rig’s mud pump. When the mud returns from the annular space between the casing and the good wall, due to the reduction of the annulus area, the upward return speed is increased, and the carrying out of drill cuttings is improved;
7. It can reduce the size of the rig, simplify the structure of the rig, and reduce the cost of the rig.
8. The drilling rig is lighter and easier to move and operate. The amount of manual labor and costs will be reduced;
9. No longer need to use a drill pipe
10. Casing drilling is based on a single casing, and it is no longer necessary to use a vertical drilling method similar to double or three drill pipes. Therefore, the height of the derrick can be reduced and the weight of the base can be reduced; for deep well-turning machines, construction A drilling rig based on single drilling, the structure and weight of the derrick and substructure are much simpler than those based on standing drilling