A downhole multifunctional energy synergistic control drilling speed increasing tool and method

By using a downhole multi-functional energy-coordinated drilling speed-up tool, the vibration of the pressure-reducing cylinder is converted into torsional force. Combined with an amplitude transformer and a magnetostrictive transducer, the problem of deep well drill bit vibration is solved, thereby increasing drilling speed and effectively reducing the pressure of the drilling fluid at the bottom of the well.

CN120968423BActive Publication Date: 2026-07-24CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Filing Date
2025-09-30
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In deep well drilling, drill bit vibration is a serious problem, leading to drill bit fatigue damage and high drilling costs. How to reduce vibration and increase drilling speed has become a key issue.

Method used

The downhole multi-functional energy-coordinated control drilling speed-up tool utilizes the axially movable and radially rotatable connection between the upper mandrel and the pressure-reducing cylinder, the setting of the elastic reset component, and the cooperation of the upper and lower torsion transmission mechanisms. By converting the axial force into torsional force through the up-and-down vibration of the pressure-reducing cylinder, additional torsional impact force is applied. During vibration reset, the axial force and torsional force of the main drill bit are maintained. Combined with the amplitude transformer and magnetostrictive transducer, the continuous rock breaking of the main drill bit and the periodic pressure reduction of the drilling fluid at the bottom of the well are achieved.

Benefits of technology

It achieves continuous rock breaking by the main drill bit, periodic accelerated rock breaking, and periodic pressure reduction of the drilling fluid at the bottom of the well, reducing drill bit vibration, increasing drilling speed, and maintaining drilling stability.

✦ Generated by Eureka AI based on patent content.

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    Figure CN120968423B_ABST
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Abstract

This invention discloses a multifunctional energy-coordinated drilling acceleration tool and method for downhole drilling, belonging to the field of drilling engineering technology. It includes an upper connector, a pressure-reducing cylinder, a mandrel, and a main drill bit. The mandrel comprises an upper mandrel and a lower mandrel. The upper mandrel is located inside the pressure-reducing cylinder, and its outer wall surface can slide axially or rotate radially relative to the inner wall surface of the pressure-reducing cylinder. The main drill bit is located at the bottom end of the lower mandrel. An elastic reset component is provided at the top end of the upper mandrel. An upward torque transmission mechanism is provided at the bottom end of the pressure-reducing cylinder, and a downward torque transmission mechanism is provided at the top end of the lower mandrel. Through the connection between the upper mandrel and the pressure-reducing cylinder, the provision of the elastic reset component, and the coordination between the upward and downward torque transmission mechanisms, this invention transforms the axial force of the downward vibration of the pressure-reducing cylinder into a torsional force when the pressure-reducing cylinder vibrates downward, applying additional torsional impact force to the main drill bit and accelerating rock breaking. When the pressure-reducing cylinder vibrates upward, the mandrel and the main drill bit do not follow the upward vibration, thus achieving a downhole vibration absorption effect.
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