Mud cyclic purification system and mud purification method during drilling

Abstract

The invention discloses a mud cyclic purification system during drilling and a mud purification method thereof. The mud cyclic purification system is characterized in that a swirler (7) comprises a cylinder body (7.1), an inverted cone body (7.2) and an inverted cone hopper (7.3); a sand outlet (7.5) in the bottom of the inverted cone body (7.2) is in threaded connection with the inverted cone hopper (7.3) through an upper flange plate (8) and a lower flange plate (9); a sand outlet pipe (19) is fixed to the bottom end of the inverted cone hopper (7.3) of the swirler (7); and a first flow regulating valve (20) is arranged on the sand outlet pipe (19). The method comprises the key steps that mud in the swirler (7) is classified under the action of centrifugal force; and most drilling slags are thrown to the cylinder wall of a working cylinder, and rotate downwards to pass through the sand outlet (7.5), the inverted cone hopper (7.3) and the sand outlet pipe (19) to be completely discharged from the mud circulation. According to the purification system and the purification method, the energy consumption can be reduced, and the hole cleaning and deslagging efficiency is improved.

Description

technical field [0001] The invention relates to the field of drilling construction in civil engineering, in particular to a mud circulation purification system during drilling and a mud purification method during drilling. Background technique [0002] When the drill pipe is drilled, a large amount of mud is needed. The mud mainly plays the role of protecting the wall, cooling the drill bit, taking away the drilling slag and softening the soil. The mud can be pre-prepared and stored in the slurry tank. When the drill pipe is drilled, the mud is pumped into the borehole. Of course, when drilling in the cohesive soil layer, the mud can also be directly injected to reduce the amount of prefabricated mud. cut costs. [0003] Of course, to use the viscosity of the mud to take away the drilling slag, it is necessary to use a mud circulation purification system to circulate the mud. The mud circulation and purification system in the prior art includes a hollow drill pipe, a mud o...

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Problems solved by technology

[0006] The mud circulating purification system of the above-mentioned prior art has the following drawbacks: 1. When the circulating purification system is working, the motor of the desander works continuously to drive the screen to swing, and its energy consumption is relatively large; 2. And more critically, The system has a low purification and slag removal efficiency. Even if the mud discharged from the sand outlet is re-screened by the screen, there is still a considerable part of the small drilling slag that cannot be removed, and this part of the drilling slag is recycled back to the borehole, so , During the drilling process, it is often necessary to circulate the mud several times to meet the needs of clearing the hole

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