Downhole fluid one-way conduction high-speed stop valve and using method thereof

Abstract

The invention discloses an underground fluid one-way conduction high-speed stop valve which comprises a center pipe and an outer pipe, a containing space is formed between the center pipe and the outer pipe, a multi-stage outer guide cylinder, a multi-stage inner guide cylinder, an outer circular guide cylinder and an inner circular guide cylinder are further arranged in the containing space, and the upper end of the outer pipe is in positioning connection with the center pipe through an upper gland. The lower end of the outer pipe is connected with the central pipe in a positioning mode through a lower pressing cover, gaps are formed among the inner flow guide cylinder, the outer flow guide cylinder, the outer circular flow guide cylinder and the inner circular flow guide cylinder at intervals, and the gaps form a continuous structure channel in the containing space. The flow velocity is controlled through the flow guide and backflow effects of the continuous structure channel, and oil well exploitation safety is guaranteed. The invention further discloses a method for applying the downhole fluid one-way conduction high-speed stop valve, and the fluid is injected into the stratum through the method. The valve body of the device is free of moving parts, high in reliability and easy to construct and install.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oil exploitation, in particular to a one-way high-speed cut-off valve for downhole fluid and a method for using the same. Background technique [0002] At present, in oil production well fluid-controlled layered water injection and oil production process strings, the one-way valve used in the downhole usually uses a ball or spring to achieve one-way conduction. When the other direction is pressurized, the one-way valve will be blocked. channel, and then realize the functions of preventing anti-spitting sand, well control safety, and ensuring the safety of oil well production. [0003] In the production process, in order to adapt to the actual working conditions, it is necessary to inject or extract the fluid under the condition that the low-speed flow of the oil well fluid is safely controlled. When the existing one-way pilot valve is used, when the fluid velocity increases to the desig...

AI Technical Summary

Problems solved by technology

[0003] In the production process, in order to adapt to the actual working conditions, it is necessary to inject or extract the fluid under the condition that the low-speed flow of the oil well fluid is safely controlled. When the existing one-way pilot valve is used, when the fluid velocity increases to the designed critical value, Because there is no corresponding flow rate control structure in the check valve, the flow rate is not easy to be controlled. At this time, the oil layer is easily damaged by impact due to the excessive fluid velocity injected by the water injection well, or the oil reservoir is easily damaged by the excessive fluid velocity injected by the water injection well. Excessive oil production leads to well kick, blowout and other abnormalities

Images