Drilling fluid recycling method and negative pressure vibrating screen

A technology of drilling fluid and vibrating screen, applied in the field of drilling fluid, which can solve the problems of small processing capacity, inability to eliminate mud bubbles, and increased well control risks

Pending Publication Date: 2021-07-30
陕西省能源化工研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Drilling fluid recycling method and negative pressure vibrating screen

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Comparison scheme
Effect test

Embodiment 1

[0054] If the density of drilling fluid is 1.66g / cm 3 , When the viscosity is 56s, after using the negative pressure device, a vibrating screen can recover drilling fluid more than 37% in the discharged cuttings (519kg / hour, about 0.31m 3 / hour), if three vibrating screens are used, 1557kg / hour of drilling fluid can be recovered (about 0.93m 3 / hour), according to the calculation of 8 hours per day, 12.45 tons of drilling fluid (about 7.44 m 3 ), 373 tons of drilling fluid (about 223.2 m 3 ), and the vibrating screen using the negative pressure device can ensure that the mud handling capacity is greater than 60m in the case of using a high mesh (200 mesh) screen 3 / Hour.

Embodiment 2

[0056] The negative pressure vibrating screen (4 screens) recovers about 60% more available drilling fluid from the cuttings discharged when the negative pressure is turned on than when the negative pressure is turned off; The negative pressure system transformation and upgrading above the screen) can at least improve the recovery rate of drilling fluid in the cuttings by more than 35%. For example, a well team produces 1000m 3 350m of solid waste can be recovered every month after transformation 3 above available mud while reducing 350m 3 the cost of solid waste treatment. Not only reduces the amount of mud loss, but also reduces the cost of solid waste treatment.

[0057] After the negative pressure vibrating screen is used in the present invention, the mesh number (≥200 mesh) of the screen can be increased on the original processing capacity, and the solid control efficiency and effect can be improved without the mud running through the vibrating screen, and the dosage of...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/06
CPCE21B21/065E21B21/066
Inventor 魏涛习伟东巨浩波李胜忠刘杰高岩潘童唐道见陈曦韩俊郑化安赵军刘立鹏徐钰佳
Owner 陕西省能源化工研究院
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