Sand-proof bypass valve device for drill rod

Abstract

The invention relates to a sand-proof bypass valve device for a drill rod. The sand-proof bypass valve device for the drill rod comprises a valve body and valve core, the lower portion of the valve body is provided with an external tapered thread joint, the inside of the valve body is provided with a through hole, the upper portion of the through hole is provided with an internal tapered thread joint, one surface of the valve core, which is adjacent to the valve body, is an inclined plane I, the lower end of the inclined plane I is provided with a limit plane I, horizontal holes are formed inside the valve body, the tail end of each horizontal hole is provided with a limit protrusion I, springs and reset blocks are arranged inside the horizontal holes, the reset blocks are arranged at the ends of the horizontal holes, one end of each reset block is a plane connected with the corresponding spring, the other end of the reset block is an inclined plane II adjacent to the valve core, one end of each reset block, which is connected with the corresponding spring, is provided with a limit protrusion II, one end of each limit protrusion II, which is close to the limit protrusion I, is provided with sealing rubber, and the lower end of each horizontal hole is further provided with a limit horizontal plane II. By means of the sand-proof bypass valve device for the drill rod, sediment in reflux cannot enter the horizontal holes, further spring corrosion and blocking can be avoided, vertical movement is transformed into horizontal movement through the inclined planes, amount of compression of the springs can be reduced, over-compression of the spring can be prevented, the service life of the spring is prolonged and further the service life of the whole bypass valve can be improved.

Description

technical field [0001] The invention relates to the field of screw drilling tools, in particular to a sand prevention bypass valve device for drilling rods. Background technique [0002] A large number of screw drilling tools are used in the oil and gas industry. The screw drilling tool is composed of four parts, which are bypass valve, motor, cardan shaft and transmission shaft. The existing bypass valve is an auxiliary part of the screw drilling tool, which is installed on the upper end of the screw drilling tool. Its function is first to connect the drill collar and the centralizer joint, and second, when the pump is turned on, the drilling fluid flows through the side under pressure. When the through hole in the valve is opened, the spool of the bypass valve moves downward and vertically until it is closed, and the drilling fluid is used to drive the screw drilling tool to work and circulate; when the pump is stopped, the space in the through hole in the bypass valve is...

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