Magnetic coupling driving numerical control plug

Abstract

The invention discloses a magnetic coupling driving numerical control plug. The magnetic coupling driving numerical control plug comprises a lower plug, a plug main body, a titanium alloy plug, a permanent magnet sheet fixing sleeve, a coupling, a valve sleeve, a valve core, a rubber ring, a driving shaft, permanent magnet sheets, a speed reducer, an absolute value encoder and a permanent magnet shaft, the plug main body achieves static sealing by using a first O-shaped ring group, one permanent magnet sheet is arranged in each permanent magnet sheet mounting hole of the permanent magnet sheetfixing sleeve, and one end of the permanent magnet sheet fixing sleeve is connected to the output shaft of the speed reducer through the coupling; and the titanium alloy plug is placed in the hole ofthe permanent magnet sheet fixing sleeve in a sleeved mode, the titanium alloy plug is in clearance fit with the permanent magnet sheet fixing sleeve, the permanent magnet shaft and the driving shaftare connected by adopting a mortise and tenon structure, the permanent magnet shaft rotates under the action the high magnetic field in the permanent magnet sheet fixing sleeve, a driving thread is arranged on the upper part of the driving shaft and matched with the thread of the plug main body, the output end of a high torque DC motor is connected to the speed reducer, and the absolute value encoder is mounted at the tail of the high torque DC motor and used for recording the rotating ring number of the high torque DC motor so as to indirectly determine the position of the valve core.

Description

technical field [0001] The invention relates to a layered flow control device for water injection wells used in the technical field of downhole water injection flow control in oil field production. Background technique [0002] Water injection is currently an important means of increasing oil recovery and has been widely used and promoted in major oil fields. In order to improve the quality of water flooding, the water injection process has gradually developed from the general water injection technology to the current subdivided fine water injection technology. Intelligence and efficiency have become the development direction of layered water injection. Among them, the intelligent water distributor is the current intelligent layered water injection process. The core tool, the intelligent water distributor can realize the real-time measurement and adjustment of the downhole flow from the uphole, and the main execution part is the numerical control plug. However, the existing...

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Problems solved by technology

[0003] In order to solve the technical problems mentioned in the background technology, the present invention provides a magnetic coupling transmission digital control plug, which uses magnetic coupling transmission technology to convert dynamic seals into static seals, avoiding complicated dynamic seals The problem of structure and processing cost greatly reduces the difficulty of sealing, and combines the magnetic transmission technology and the absolute value encoder to control the absolute position of the valve core to realize the dynamic balance of the pressure at the valve, and solve the problem of the blockage caused by the high pressure at the outlet of the valve during the water distribution process. The problem of turning, and realize the purpose of numerical control to adjust the flow, the flow control accuracy is high

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