Drill column vibration and hydraulic pulse coupling downhole drilling tool

Abstract

The invention discloses a drill column vibration and hydraulic pulse coupling downhole drilling tool which comprises an upper joint, an outer cylinder, a locking nut, a core shaft and a lower joint. The outer cylinder and the core shaft are in sliding key fit; a disc-shaped spring is arranged between the outer cylinder and the core shaft; a pressurized flow dividing structure is arranged at the upper end of the core shaft; a main flow hole channel of the pressurized flow dividing structure communicates with a fluid channel in the center of the core shaft; flow diving hole channels are formed in the periphery of the main flow hole channel; the upper portion of the outer cylinder, a pressurized flow dividing channel and the upper portion of the core shaft form an annular pressurized cavity; the flow diving hole channels communicate with the annular pressurized cavity; the annular pressurized cavity communicates with the main flow hole channel through a jet flow hole channel; and when the outer cylinder and the core shaft relatively move, the size of the annular pressurized cavity can be changed, and the jet flow hole channel is closed periodically. According to the drill column vibration and hydraulic pulse coupling downhole drilling tool, through alternating load coupling generated by a hydraulic pulse jet flow and drill column vibration, shaft bottom rock is effectively stripped from the shaft bottom, meanwhile, the pulse jet flow improves the cleaning ability of rock debris, and thus the drilling speed is increased.

Description

technical field [0001] The invention relates to a downhole percussion drilling tool coupled with drill string vibration and hydraulic pulse jet flow, and belongs to the technical field of petroleum drilling tool design. Background technique [0002] Improving the drilling speed of deep and ultra-deep wells is crucial to the exploration and development of oil and gas resources in deep formations. During conventional operations, the cutting and extrusion of the drill bit and the longitudinal vibration of the drill bit are mainly used to improve the rock breaking efficiency. The development of downhole booster pumps, the design of hydraulic pulse tools and rotary percussion drilling tools can effectively use the energy of drilling fluid to increase the rate of penetration. Studies have shown that when the bottom hole drilling fluid pressure is increased to about 100 MPa by using the downhole booster device, the purpose of ultra-high pressure jet or auxiliary rock breaking can b...

AI Technical Summary

Problems solved by technology

Studies have shown that when the bottom hole drilling fluid pressure is increased to about 100MPa by using the downhole booster device, the purpose of ultra-high pressure jet flow or assisting rock breaking can be achieved, but the life of this booster tool has not been effectively solved.

However, in most cases, the cuttings cannot be washed away from the bottom of the well in time, resulting in repeated fragmentation, and even cause bit balling, resulting in a decrease in drilling speed

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