22
2021
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03
What should I do if the small rotary drilling rig encounters mudstone during construction?
Mudstone is generally inferior in plasticity, fine crystal particles, and bedding structure, resulting in a smooth surface. Coupled with the mud lubrication and softening treatment of the rock formation during the construction process, it is prone to slipping, tooth jamming, muddy bottom and other phenomena.
Mudstone is generally inferior in plasticity, fine crystal particles, and bedding structure, resulting in a smooth surface. Coupled with the mud lubrication and softening treatment of the rock formation during the construction process, it is prone to slipping, tooth jamming, muddy bottom and other phenomena. Although the poles and broken ends are light, they also have a lot of impact on the construction and require special attention.
Generally, when I encounter this kind of mudstone, I first consider the configuration of the machine. I need to be equipped with a friction drill pipe and a flat-tooth open-body drill bucket. This is efficient and can effectively slow down the mudstone jamming and muddy bottom. .
The construction process is as follows:
At first the engine throttle is kept at 5~6 gears, the power head has a low speed of 8~12rpm, floating normally open, the pressure method is: long stroke continuous pressure, until the load rises, that is, after seeing the bucket teeth cut into the mudstone, change to follow up Point pressurization method, if the pressurization is too much, the point back pressure method can be used to relieve the pressure. At this time, the engine throttle is generally adjusted to 8~10 gears, and the power head rotates the maximum flow output. This mode of operation ensures maximum cutting into the mudstone at the initial stage and provides a reaction force for the friction drill pipe. After cutting, the follow-up point is pressurized to prevent mud from entering the drill teeth and the cut geology to increase the friction coefficient. Back pressure can protect the side teeth.
To sum up, there are two parts to be paid attention to when drilling mudstone with rotary drilling rigs:
The first is the characteristics of mudstone, mainly to prevent the softening of the teeth and the muddy bottom phenomenon;
The second is the strength of mudstone. It is very necessary to select and control the host according to the strength. In summary, I hope my colleagues in the industry can correct me if there is something wrong.
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