Pressure relief method and device for bypass valve of screw drill
A screw drilling tool and bypass valve technology, which is used in earth-moving drilling, wellbore/well components, flushing wellbore, etc., can solve the problems of motor assembly damage, enlargement, and excess, and prevent motor assembly from being damaged. Effect
Pending Publication Date: 2022-01-28
YANGTZE UNIVERSITY
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Problems solved by technology
[0005] However, during the drilling process, due to misoperation or equipment failure, the instantaneous flow rate of drilling fluid in the drill string may suddenly increase sharply, and the existing bypass valve does not have a pressure relief function. The flow rate of the drilling fluid may exceed its maximum allowable value, causing damage to the motor assembly
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[0027] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.
[0028] Please refer to figure 1 with figure 2 , The present invention provides a pressure relief method for a screw drilling tool bypass valve, comprising installing a pressure relief mechanism 2 on the valve body 1 of the screw drilling tool bypass valve.
[0029] Please refer to Figure 1-Figure 3 , the valve body 1 has a first guide chamber 11 extending along the length direction of the valve body 1 and a pressure relief chamber 12 communicating with the first guide chamber 11 , the side wall of the valve body 1 A pressure relief hole 13 communicating with the pressure relief chamber 12...
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The invention discloses a pressure relief method and device for a bypass valve of a screw drill. The device comprises a valve body and a pressure relief mechanism, wherein the pressure relief mechanism comprises a piston body and a first elastic piece, the piston body is arranged in the pressure relief cavity in a sliding mode, the piston body can slide to a first position or a second position, when the piston body is located at the first position, the first flow guide cavity is communicated with the pressure relief hole, and when the piston body is located at the second position, the first flow guide cavity and the pressure relief hole are separated by the piston body. The device is advantaged in that during drilling, when the flow velocity of drilling fluid in the first flow guide cavity exceeds a preset value, the piston body moves to a first position in the pressure relief cavity under the pressure of the drilling fluid in the pressure relief cavity, and the first flow guide cavity is communicated with the pressure relief hole; therefore, the high-pressure drilling fluid in the first flow guide cavity is sprayed out from the pressure relief hole, the pressure of the drilling fluid in the first flow guide cavity is reduced, and the situation that the flow speed of the drilling fluid entering the motor assembly exceeds the maximum allowable value, and consequently the motor assembly is damaged can be prevented.
Description
technical field [0001] The invention relates to the technical field of screw drilling tools, in particular to a pressure relief method and device for a bypass valve of a screw drilling tool. Background technique [0002] The screw drilling tool is a volumetric downhole power drilling tool that uses drilling fluid as power and converts fluid pressure energy into mechanical energy. The screw drilling tool mainly includes a bypass valve, a motor assembly, a universal joint shaft assembly and a transmission shaft assembly, and the bypass valve, the motor assembly, the universal joint shaft assembly and the transmission shaft assembly are connected sequentially from top to bottom. [0003] The bypass valve is one of the important components of the screw drilling tool. The bypass valve is composed of a valve body, a valve core and a spring (see the Chinese invention patent application number CN201420336251.2 for details). Under the pressure of the drilling fluid The spool slides ...
Claims
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Login to View More IPC IPC(8): E21B21/10
CPCE21B21/103
Inventor 易先中张仕帆陈霖王宴滨刁斌斌柯扬船高德利刘航铭易军
Owner YANGTZE UNIVERSITY