Spring-Loaded Tapered Tube Drill Bit Obstruction Removal
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Solution Overview
Problem
Drill bits often become clogged with obstructions like rocks or debris during wellbore drilling, requiring costly and time-consuming procedures to clear obstructions without pulling the drill bit out of the wellbore or using additional equipment or chemicals.
Innovation Solution
A spring-loaded shoe or tube mechanism within the drill bit's fluid channel moves under fluidic pressure to push and remove obstructions, utilizing a tapered tube and shoulders to constrain and rotate the shoe or tube, effectively clearing blockages without the need for additional equipment or chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill bit operates continuously in the wellbore, then drilling productivity is maintained, but obstructions accumulate in the fluid channel causing clogging
Solution Approach 1:
The system uses the existing drilling fluid flow to power the obstruction removal mechanism. The fluid pressure automatically activates the tapered tube to push obstructions out of the fluid channel, eliminating the need for external intervention or additional equipment while maintaining continuous operation
Solution Approach 2:
The tapered tube is designed to be movable rather than fixed, allowing it to dynamically respond to fluid pressure changes. The tube moves in response to pressure differentials to actively clear obstructions, transforming the static fluid channel into a self-cleaning dynamic system
2Reliability
If additional equipment or chemicals are used to clear obstructions, then obstruction removal effectiveness is improved, but device complexity and operational costs increase
Solution Approach 1:
The drill bit's own drilling fluid circulation system is utilized to power the obstruction removal function. The existing fluid flow provides the pressure needed to actuate the tapered tube, eliminating the need for separate power sources, additional equipment, or chemical treatments
Solution Approach 2:
The drilling fluid serves dual purposes: it performs the primary drilling function and simultaneously powers the obstruction removal mechanism. This multi-functionality eliminates the need for dedicated obstruction removal equipment or chemicals
3Reliability
If the drill bit is pulled out of the wellbore to clear obstructions, then complete obstruction removal is achieved, but drilling time and operational costs increase
Solution Approach 1:
The obstruction removal mechanism is pre-positioned within the drill bit structure, with the tapered tube ready to be activated by fluid pressure. This allows immediate clearance action without needing to retrieve or reposition components, enabling rapid obstruction removal while the drill bit remains in place
Solution Approach 2:
The system performs self-maintenance by automatically clearing obstructions using its own fluid circulation system, eliminating the need for human intervention or drill bit retrieval. The mechanism activates on-demand to maintain continuous drilling operations
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
Enables efficient and non-invasive obstruction removal within the drill bit, maintaining drilling efficiency and reducing operational costs by clearing obstructions without pulling the drill bit out of the wellbore or using solvents, thus improving the overall drilling process.
Implementation Method 1
The shoe is movable under fluidic pressure in the flow direction to compress or extend the spring. The tube pushes an obstruction in the fluid channel out of the fluid channel upon movement of the tube.
Implementation Method 2
The spring is coupled to and is disposed between the inwardly projecting shoulder and the rim of the tapered tube. The tapered tube is movable under fluidic pressure in the flow direction to compress or extend the spring.
Implementation Method 3
The tapered tube is rotatable about a central longitudinal axis of the internal fluid channel. The tapered tube moves along the internal fluid channel and rotates, under fluidic pressure of the drilling fluid, pushing the obstruction disposed downstream of the tapered tube.
Data Source
AI summary
A wellbore assembly includes a drill string and a drill bit in fluid communication with the drill string. The drill bit has a tubular wall, an internal fluid channel, a tapered tube, and a spring. The fluid channel receives and flows the drilling fluid from the drill bit bore and out the drill bit. The fluid channel includes an inwardly projecting shoulder. The tapered tube is disposed inside the fluid channel. The tube has a rim and a wall extending from and converging away from the rim in a flow direction of the drilling fluid. The spring is disposed between the inwardly projecting shoulder and the rim. The tapered tube is movable under fluidic pressure in the flow direction to compress or extend the spring. The tube pushes an obstruction in the fluid channel out of the fluid channel upon movement of the tube.