Well drilling device for generating hydraulic pulse

Abstract

The invention discloses a well drilling device for generating hydraulic pulse, which is characterized in that a core shaft of the device is connected with a transmission shaft of a screw drill, an upper body is connected with a shell of the screw drill, the upper body is in threaded connection with a lower body, power transmitted to the core shaft by the transmission shaft is transmitted to a drill bit after passing through a transmission nipple, and the core shaft is provided with a fluctuating surface; the hydraulic piston is provided with a roller and is matched with the lower body through a spline, when the transmission shaft drives the mandrel to rotate, the hydraulic piston periodically and axially moves, when the hydraulic piston moves upwards, the hydraulic piston extrudes fluid in the cavity above into the mandrel, in the process, a fluid channel between the cavity and a well annulus is closed, and the hydraulic piston is driven to rotate. When the hydraulic piston moves downwards, the one-way valve is closed, but fluid can flow from the outer annulus of the wellbore to the cavity above the hydraulic piston. The device can provide hydraulic pulse for a rock breaking drill bit on the basis of a conventional sliding drilling tool, and is used for improving rock breaking efficiency and accelerating migration of rock debris at the bottom of a well.

Description

technical field [0001] The invention relates to a drilling device, in particular to a drilling device for generating hydraulic pulses, belonging to the technical field of mechanical engineering or drilling engineering. Background technique [0002] During the drilling process, with the continuous progress of drilling, the depth of the well increases, and the strength and hardness of the rock also increase, resulting in problems such as low ROP and difficult cuttings migration. The continuous injection of drilling fluid at the bottom of the hole is modulated into pulse injection, which can reduce the difficulty of rock crushing and effectively improve the cleaning ability of bottom-hole cuttings, thereby achieving the purpose of increasing the drilling rate. [0003] The common downhole pulse jet generating device uses a specially designed mechanism to realize the on-resistance change or periodic oscillation of the fluid at the bottom of the well without changing the ground e...

AI Technical Summary

Problems solved by technology

However, this type of design has the following problems: (1) This type of device only redistributes the energy of the original drilling fluid, not only does not introduce external energy, but also loses part of the energy; (2) The energy of the drilling fluid increases with the As the well depth increases, the speed-up effect of the device will also be affected.

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