Downhole blow-out preventer with automatic controlling and anchoring function

Abstract

The invention relates to a downhole blow-out preventer with an automatic controlling and anchoring function, which is used in a condition of occurring well kick or blowout in a drilling process of an oil and gas field. The downhole blow-out preventer can be used for automatically turning on a shut-in well underground, and can be used for de-blocking the preventer in time according to demands. According to the technical scheme, an underground safety valve is mounted in a drill column on a drill pipe; a base sealing and anchoring device is mounted on the downhole blow-out preventer; a lower joint is connected with a lower part drill pipe; an outer wall one-way valve assembly is mounted on an outer cylinder; a switching-on pin is mounted on the outer cylinder and a pressurizing piston; the outer cylinder is fixed by the lower joint; the pressurizing piston is mounted outside a center pipe; a rubber cylinder base is in close contact with a separation ring; the lower end of an outer center pipe is in contact with the rubber cylinder base, and a distance is reserved between the upper end of the outer center pipe and an anchoring tilt cone; a blow-out prevention sealing rubber cylinder is in tight contact with the outer center pipe; and an anchoring tile, the center pipe and an anchoring tile sleeve are fixedly arranged by an upper joint. The downhole blow-out preventer can be used for effectively preventing the blowout underground, so anchoring, blowout prevention and operation while drilling when the well kicks can be realized; the reliable operation is realized; and the drilling efficiency can be improved.

Description

technical field [0001] The invention relates to a downhole blowout preventer with automatic control and anchoring functions, which is installed on the wall of the downhole blowout preventer and is controlled by a valve when well kick or blowout occurs in the drilling process of oil and gas fields. Background technique [0002] The well control blowout prevention equipment currently in use mainly includes two types: the external blowout preventer installed at the wellhead and the blowout preventer installed in the drill string. The external blowout preventer mainly refers to the wellhead blowout preventer group. The common ones are: Combination of rotary blowout preventer, ring blowout preventer and various types of ram blowout preventer. The blowout preventer in the drill string mainly includes: upper and lower cocks of kelly, kelly protection valve, drilling tool back pressure valve, drop-in check valve and drilling fluid automatic blowout preventer, etc. When the above-me...

AI Technical Summary

Problems solved by technology

The above-mentioned blowout preventers all need to transmit the detected abnormal signals to the well through the downhole electronic control components, and then complete the downhole blowout prevention work through the uphole control. However, there are a series of difficulties in the acquisition and transmission of electrical signals, and it has been difficult to popularize so far.

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