A Downhole Drilling Tool Coupling Drill String Vibration and Hydraulic Pulse

Abstract

The invention discloses a downhole drilling tool coupled with drill string vibration and hydraulic pulse, which comprises an upper joint, an outer cylinder, a lock nut, a mandrel and a lower joint. Belleville springs are arranged between the mandrels, and a pressurized flow distribution structure is arranged on the upper end of the mandrels, the main channel on the pressurized flow structure communicates with the fluid channel in the center of the mandrel, and a flow channel is provided around the main flow channel. The upper part of the outer cylinder, the pressurized diversion channel and the upper part of the mandrel form an annular pressurized chamber, the diverter channel communicates with the annular pressurized chamber, and the annular pressurized chamber communicates with the main channel through the jet channel. When the outer cylinder and the mandrel move relative to each other , can change the size of the annular pressurized cavity, and make the jet channel open and close periodically. The invention couples the hydraulic pulse jet with the alternating load generated by the vibration of the drill string to effectively strip the rock at the bottom of the well, and at the same time, the pulse jet improves the cleaning ability of cuttings, thereby increasing the drilling speed.

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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