Conical valve type automatic downhole blowout preventer and using method thereof

Abstract

The invention relates to a conical valve type automatic downhole blowout preventer and a using method thereof. The blowout preventer comprises an upper drill rod casing pipe, an inner pipe, a drillingfluid inflow hole, an annular piston, an annular piston rod, a drilling fluid outflow hole, a guide ring fixation rod, a rectangular guiding ring, a rectangular-section guiding rod, a lead screw, a rubber cylinder, a motor fixation rod, a linear motor system, a rubber cylinder positioning ring, a conical valve core, a lower drill rod casing pipe, a drill pipe, and a wellbore. The blowout preventer is controlled by a while-drilling pressure sensor; an acoustic pulse signal transmitted by the drill rod is used for communication; and a signal receiver is installed inside the linear motor system.When the drill bit drills a high pressure layer, the pressure sensor detects the high pressure and sends a pulse signal to the linear motor system; the linear motor is started when the signal is received; the lead screw connected to the conical valve core is drive to rise; and the outlet of the drilling liquid in the pipe is closed. And then the drilling liquid enters the piston cylinder to pushthe piston to move down and the rubber cylinder is extruded to be expanded, so that the annular space in the wellhole is turned off.

Description

technical field [0001] The invention relates to the technical fields of well control equipment and oil and gas exploitation, and relates to a cone valve type automatic downhole blowout preventer device. Background technique [0002] The blowout preventer is the core equipment in the well control equipment. During the drilling operation, in case of emergencies such as flow, well kick and blowout, the blowout preventer should be quickly activated to shut down the well. The blowout preventer is one of the key equipment to ensure the smooth progress of drilling operations and personal safety. [0003] For example, the U.S. Patent No. US4712613A proposes a plug valve downhole blowout preventer. Its main features are the use of mud pulses to transmit control signals, the use of solenoid valves to control the opening and closing of flow channels, drilling fluid as a power source, and plug valve isolation drills. Columns and expandable packers seal off the annulus. Its disadvantag...

AI Technical Summary

Problems solved by technology

Its disadvantage is that there is no circulation channel above the isolation position, and the flapper valve cannot withstand high pressure

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