Fluid-Actuated Hammer Bit Valve Mechanism
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Solution Overview
Problem
Traditional downhole hammer systems activated by drilling fluid lack efficient mechanisms to cyclically vary the weight loaded to the drill bit, limiting their ability to effectively penetrate formations through vibrations.
Innovation Solution
A drilling assembly with a continuous fluid passageway and a valve mechanism that cyclically builds up and releases pressure, causing radial expansion and contraction, thereby varying the weight loaded to the drill bit, which induces vibrations to enhance drilling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional downhole hammer systems are activated by drilling fluid, then the drill string can apply drilling power to the formation, but the system lacks efficient mechanisms to cyclically vary the weight loaded to the drill bit, limiting vibration capability
Solution Approach 1:
The fluid passageway is designed with expandable and contractible portions that dynamically change volume in response to pressure variations. This dynamic structure allows the system to cyclically vary the weight loaded to the drill bit without adding complex mechanical vibration mechanisms, thereby improving drilling efficiency while maintaining relatively simple device architecture.
Solution Approach 2:
The invention uses drilling fluid pressure pulses to actuate the expandable and contractible portions of the fluid passageway. By controlling fluid pressure cyclically, the system generates vibrations in the drill bit that enhance penetration into the formation, replacing traditional mechanical activation systems with a hydraulic/pneumatic approach.
2Force
If pressure is cyclically built up and released in the fluid passageway, then vibrations are induced to enhance penetration, but the mechanism requires complex valve control
Solution Approach 1:
The valve mechanism is designed to automatically respond to pressure conditions within the fluid passageway system. Rather than requiring external control signals or complex timing mechanisms, the valve opens and closes based on pressure differential thresholds, enabling cyclic pressure variation and resulting impulse forces on the drill bit through self-regulating behavior.
3Productivity
If the fluid passageway expands and contracts radially, then weight variation is achieved, but the structural integrity may be compromised
Solution Approach 1:
The fluid passageway incorporates flexible or elastomeric portions that can radially expand and contract in response to pressure changes. These flexible sections are designed with appropriate material properties and geometric configurations that allow controlled deformation while maintaining structural integrity, enabling weight variation capability without compromising the overall strength of the drill bit assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cyclic variation of weight loaded to the drill bit increases drilling efficiency by inducing vibrations that resonate with the formation, making it easier to break up and penetrate through various subterranean formations.
Implementation Method 1
pressure is substantially cyclically built up and released within the fluid passageway such that a pressure build-up results in radial expansion of at least a portion of the fluid passageway
Implementation Method 2
a pressure build-up results in radial expansion of at least a portion of the fluid passageway and wherein a pressure release results in a contraction of the portion of the fluid passageway
Implementation Method 3
The expansion and contraction of the portion of the fluid passageway varies a weight loaded to the drill bit, which induces vibrations to enhance drilling efficiency
Data Source
AI summary
In one aspect of the present invention, a drilling assembly has a string of downhole tools connected to a drill bit with a bit body intermediate a shank and a working face. The drill bit is connected to the string of tools at the shank. A continuous fluid passageway is formed within the bit body and the string of tools. A valve mechanism disposed within the fluid passageway is adapted to substantially cyclically build-up and release pressure within the fluid passageway such that a pressure build-up results in radial expansion of at least a portion of the fluid passageway and wherein a pressure release results in a contraction of the portion of the fluid passageway. The expansion and contraction of the portion of the fluid passageway varies a weight loaded to the drill bit.