Drilling fluid recycling method and negative pressure vibrating screen

Abstract

The invention discloses a drilling fluid recycling method and a negative pressure vibrating screen. The drilling fluid recycling method comprises the following steps that an air compressor is started and continuously works to generate high-speed flowing air; an air pressure difference is formed between the upper part and the lower part of a screen mesh through a negative pressure suction cup mounted below the screen mesh of the vibrating screen, so that viscous drilling fluid is stored in a negative pressure storage tank through the screen mesh, and residues in the drilling fluid are saved; then drilling fluid is pressed into a drilling fluid storage tank through a one-way valve, the negative pressure storage tank is emptied, besides, a pressure difference opposite to a negative pressure state is formed on the upper surface and the lower surface of the screen mesh through the negative pressure suction cup mounted below the screen mesh of the vibrating screen, and residues adhering to the screen mesh are removed; and the negative pressure suction cup forms pulsating airflow with a certain frequency at the screen mesh of the vibrating screen, and double filtration of drilling fluid through vibration and negative pressure is achieved. The drilling fluid solid control efficiency can be improved, drilling fluid consumption can be reduced, the drilling fluid rock debris content can be reduced, drilling acceleration can be assisted, and the drilling equipment level can be improved.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid, and particularly relates to a drilling fluid recycling method and a negative pressure vibrating screen. Background technique [0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with various functions during the drilling process. It is one of the main sources of pollution in the oil and gas industry. The vibrating screen is the core equipment for drilling fluid purification. It is used to separate the solid phase from the circulating drilling fluid. For the purpose of solid waste reduction, this technology can also be counted as a filtration technology. [0003] For the drilling fluid vibrating screen, the screen mesh that can be used in the original drilling process is generally between 40 meshes and 140 meshes. According to modern drilling requirements, the number of screen meshes installed in the drilling fluid vibrating screen ...

AI Technical Summary

Problems solved by technology

[0004] After the traditional vibrating screen increases the mesh number, there will be problems of slurry running and small processing capacity. The traditional vibrating screen cannot eliminate the air bubbles in the mud, which will affect the water supply efficiency of the mud pump and increase the risk of well control

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