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Advantages of casing Drilling
Jul 13, 2018

Advantages of casing Drilling:

1, reduce the time to drill down.
It is about 5-10 times faster to replace the bit with a wire rope than the traditional drill pipe.
2. Save the cost of purchasing, transportation, inspection, maintenance and replacement related to drill pipe and drill collar;
3, because there is always casing in the wellbore, there is no longer a drill pipe in the wellbore in the swabbing role, so that the well control situation has been improved;
4. Eliminate the swabbing effect and pressure pulsation caused by the drill pipe;
5, the use of steel wire rope when the drill to keep the mud continuous cycle, can prevent the accumulation of cuttings, but also reduce the occurrence of wells;

6, improve the annulus speed and the condition of cleaning the wellbore. When the slurry is pumped into the casing, its inner diameter is larger than that of the drill pipe, thus reducing the hydraulic loss, which can reduce the power of the rig mud pump.
When the mud is returned from the annular space between the casing and the wellbore, because of the decrease of annular area, the upper return speed is improved, and the carrying condition of the cuttings is enhanced.

7, can reduce the size of the rig, simplifying the rig structure, reduce drilling rig costs.
The reasons are as follows:
(1) The improvement of hydraulic parameters reduces the demand of drilling rig pump power.
(2) can cancel two layer platform and discharge drill pipe box,
(3) No longer use the drill pipe,

(4) Casing drilling is based on a single casing, no longer need to use similar to the double root or three drill pipe formation of vertical drilling method, so the derrick height can be reduced, the base weight can be reduced; for deep wells, a rig based on a single drill is built,
The structure and weight of the derrick and the base are much simpler than the drilling rig based on the vertical root drilling;

8, drilling rig more lightweight, easy to move and operate.
The amount and cost of manual labor will be reduced; 9. According to the Tesco company's calculations, a 10000-foot well can save about 30% of the drilling time.

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