Drilling mud negative pressure screen

Abstract

The invention discloses a drilling mud negative pressure screen which comprises a screen body shell, a mud inlet is formed in the upper end of the screen body shell, a screening device is arranged below the mud inlet and comprises a horizontal soft screen, and the two ends of the screen are wound around a first winding drum and a second winding drum respectively. A plurality of vibration cylinders are arranged between the first winding drum and the second winding drum and located between the two layers of screens, a plurality of negative pressure exhaust pipes are arranged among the vibration cylinders in a crossed mode, and the negative pressure exhaust pipes are connected with a first negative pressure device; a first water receiving disc is arranged below the vibration cylinder and the negative pressure exhaust pipe, and is communicated with a slurry discharging opening in the screen body shell; a conveying belt is arranged below the first winding drum and located above the discharging port. The scheme can enhance oil well control and reduce environmental risks. Completely closed processing is performed, the air negative pressure principle and the conveying belt are adopted, oil mist emission is avoided, noise generated by low-frequency vibration is avoided, and the working environment can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a drilling mud negative pressure screen. Background technique [0002] The traditional vibrating screen uses a pre-tensioned screen in the frame, and the G force is as high as 7.5G, which brings the separation of fluid and cuttings. But applying such a large G force on a pre-tensioned screen causes particles that are larger than the screen openings to also be squeezed through the screen openings, and also causes degradation of the particles, allowing more particles small enough to pass through The opening of the screen, which will contaminate the otherwise clean mud. Contents of the invention [0003] Aiming at the above-mentioned deficiencies of the prior art, the present invention provides a negative pressure screen for drilling mud that uses air negative pressure to separate solid and liquid. [0004] In order to achieve the above-mentioned purpose of the invention, the t...

AI Technical Summary

Problems solved by technology

But applying such a large G force on a pre-tensioned screen causes particles that are larger than the screen openings to also be squeezed through the screen openings, and also causes degradation of the particles, allowing more particles small enough to pass through openings in the screen, which would contaminate the otherwise clean mud

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