Mud splash-proof valve for oil drilling

Abstract

The invention discloses a mud splash-proof valve for oil drilling. A shell is in a circular pipe shape, and an overall valve element is supported on a second step of an inner hole; a valve element body is in a cylinder shape with the lower end open, four steps are sequentially machined in a cylinder from bottom to top, and a valve seat is mounted on the upward cylinder wall of the first step in anattached mode; and during pump starting, mud enters the upper inner hole of the shell from an upper drilling tool, and enters a deceleration groove shaped like the Chinese character 'chuan' through three flow channels shaped like the Chinese character 'nian' to form an even and stable mud flow to enter the cylinder of the valve element body, and thus the valve element ascends to the upper parts of the flow channels shaped like the Chinese character 'nian' and an opening in the cylinder along with a piston. A soft-to-hard sealing pair is formed between the valve element and the valve seat, thus the sealing reliability is improved, the valve seat is supported through a supporting pin, a supporting seat and a strong spring, machining and mounting processes are simplified, and the product cost is lowered.

Description

technical field [0001] The invention relates to the technical field of an anti-splash valve for drilling in petroleum industry—a mud anti-splash valve, in particular to a mud anti-splash valve for oil drilling. Background technique [0002] In oil, natural gas and other drilling and workover operations, in order to prevent the mud in the kelly and its upper pipe string from spraying onto the drill floor when connecting a single root, pollute the environment, affect operations, cause waste, and increase potential safety hazards , and the anti-splash valve is installed at the lower part of the cock valve under the kelly or the kelly. Most of the anti-splash valves currently used have complex structures, poor workmanship, unreasonable valve core structure, fast mud flow rate and serious erosion, and high processing and use costs. , The hard-to-hard sealing structure has unreliable sealing performance under low pressure. When stuck, the resistance is large and normal drilling op...

AI Technical Summary

Problems solved by technology

[0002] In oil, natural gas and other drilling and workover operations, in order to prevent the mud in the kelly and its upper pipe string from spraying onto the drill floor when connecting a single root, pollute the environment, affect operations, cause waste, and increase potential safety hazards , and the anti-splash valve is installed at the lower part of the cock valve under the kelly or the kelly. Most of the anti-splash valves currently used have complex structures, poor workmanship, unreasonable valve core structure, fast mud flow rate and serious erosion, and high processing and use costs. , the hard-to-hard sealing structure has unreliable sealing performance under low pressure, and when it is stuck, the resistance is large and affects normal drilling operations. The failure rate is high, the reliability is low, and the service life is short, threatening the safety of relevant personnel and facilities.

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