Drilling fluid mud negative pressure screening system

Abstract

The invention provides a drilling fluid mud negative pressure screening system, and relates to the technical field of drilling fluid treatment. The drilling fluid mud negative pressure screening system comprises an annular filter belt and a first driving mechanism for driving the filter belt to rotate and vibrate in the circumferential direction, wherein a tensioning mechanism for tightening a filter part of the filter belt is arranged on the filter belt, a liquid inlet mechanism is arranged above the filter part, a direct impact prevention mechanism is arranged in the liquid inlet mechanism, a negative pressure hopper is arranged below the filter part, and the negative pressure hopper is sequentially connected with a solid-liquid separation device, a gas-liquid separation device and a negative pressure generation device. The solid-liquid separation device comprises a cyclone shell and a rotating impeller arranged in the cyclone shell in a spaced mode, the rotating impeller is driven by a second driving mechanism to rotate, a deformation mud scraping mechanism is arranged below the rotating impeller, and a variable diameter part can expand the deformation mud scraping mechanism along with extension of a telescopic air cylinder and drive the deformation mud scraping mechanism to rotate. The problems that in the prior art, drilling fluid solid-liquid separation equipment is large in occupied area and poor in separation effect are solved.

Description

technical field [0001] The invention relates to the technical field of drilling fluid treatment, in particular to a drilling fluid mud negative pressure screening system. Background technique [0002] The drilling fluid produced in the process of oil and other energy extraction contains toxic and harmful components such as additives. Direct discharge into the environment will cause environmental pollution, such as polluting surface and groundwater resources. Heavy metals remain in the soil and affect the growth of plants and the reproduction of microorganisms. , At the same time, because of the absorption and enrichment of plants, it will endanger the health of humans and animals. Therefore, before the drilling fluid is discharged, it is necessary to treat the drilling fluid to meet the environmental protection requirements. [0003] Drilling fluid purification in the prior art usually includes: using a vibrating screen to screen large solid particles, and the screened drill...

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Problems solved by technology

[0005] Aiming at the above-mentioned problems in the prior art, the present invention provides a drilling fluid mud negative pressure screening system, which solves the problems in the prior art that the drilling fluid solid-liquid separation equipment occupies a large area and the separation effect is poor

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