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Advantages of Casing Drilling

Date:2019-12-24    keywords: well casing, drilling, casing advantages
Oil well casing refers to the use of casing instead of drill pipe to apply torque and drilling pressure to the bit to achieve bit rotation and drilling. The whole drilling process no longer uses drill rods, drill collars, etc. The drill bit is fished with steel wire ropes, and the drill bit is lifted in the casing, that is, the drill bit is replaced without lifting. Reduced accidents such as tripping, blowout, stuck stuck, etc., improving drilling safety and reducing drilling costs.

1. Reduce the time of starting and drilling. It is about 5-10 times faster to replace the drill bit with a wire rope than with a traditional drill pipe.
2. Save on the purchase, transportation, inspection, maintenance and replacement costs related to drill pipes and drill collars;
3. Because there is always a casing in the wellbore, and there is no longer the pumping effect on the wellbore when the drill pipe is lowered, the well control situation is improved;
4. Eliminate the pumping effect and pressure pulsation caused by the lower drill pipe;
5. When the drill bit is lifted with a wire rope, the mud can be continuously circulated to prevent the accumulation of cuttings and reduce the occurrence of well surges.
6. Improved annulus return speed and wellbore cleaning. When the mud is pumped into the casing, its inner diameter is larger than that of the drill pipe, which reduces the hydraulic loss, which can reduce the power of the drilling rig mud pump. When the mud returns from the annular space between the casing and the wall of the well, the area of the annulus is reduced, which increases the return speed and improves the carry-out of cuttings;
7. It can reduce the size of the rig, simplify the structure of the rig, and reduce the cost of the rig. The reasons are as follows:
(1) The improvement of hydraulic parameters has reduced the demand for drilling rig mud pump power.
(2) It is possible to eliminate the second floor platform and the drill pipe box that discharges the drill pipe.
(3) no longer use drill pipe,
(4) Casing drilling is based on a single casing. It is no longer necessary to use a vertical root drilling method similar to two or three drill pipes. Therefore, the height of the derrick can be reduced and the weight of the base can be reduced. To build a single drilling rig, the structure and weight of the derrick and base are much simpler than that of a vertical drilling rig;
8. The rig is more portable and easy to move and operate. Both manual labor and costs will be reduced.

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