Pivotable Coring Bit Assembly for Extended Core Samples
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Solution Overview
Problem
Conventional sidewall coring tools face challenges in obtaining large volume core samples due to dimensional limitations, limited stroke length, and complexity in actuating the coring bit, which affects the accuracy of formation evaluations and hydrocarbon reserve estimates.
Innovation Solution
A selectively pivotable coring tool with a gear box-driven coring bit assembly that allows for extended core sample lengths and diameters, enabling larger core samples to be obtained with improved actuation mechanisms and energy efficiency, while maintaining a compact tool diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional sidewall coring tools are used, then the tool structure is simple, but the core sample volume is limited due to dimensional constraints
Solution Approach 1:
The coring bit assembly is nested within the tool housing, allowing the coring mechanism to be compact while still producing large volume core samples. The bit can be extended radially from the housing when needed, then retracted back inside, effectively nesting the moving coring components within the stationary housing structure.
Solution Approach 2:
The coring bit assembly is made dynamically extendable and retractable via actuation mechanisms. This allows the tool to transition between a compact configuration (when not coring) and an extended configuration (when obtaining core samples), enabling large core volume extraction without permanently increasing the tool's external dimensions.
2Length of moving object
If the coring bit stroke length is extended to obtain larger core samples, then the core sample length increases, but the actuation mechanism becomes more complex
Solution Approach 1:
The actuation system is segmented into multiple independent components including hydraulic actuators, mechanical linkages, and control systems. This segmentation allows each component to be optimized independently and simplifies the overall control architecture, managing the complexity of achieving extended stroke lengths.
Solution Approach 2:
Hydraulic actuation mechanisms are employed to provide the force and stroke length needed for extended coring operations. The hydraulic system offers smooth, controlled movement over extended distances while maintaining compact actuator sizes, thereby achieving long core samples without proportionally increasing mechanism complexity.
3Area of moving object
If the tool diameter is kept compact for easy deployment, then the tool is easier to deploy, but the core sample diameter is limited
Solution Approach 1:
The coring bit is nested within the tool housing, allowing the tool to maintain a compact external diameter for easy deployment while housing a larger diameter coring bit inside. The bit extends radially outward only during the coring operation, enabling large core diameter extraction without permanently increasing the tool's deployment diameter.
Solution Approach 2:
The coring bit is positioned to extend in a radial direction perpendicular to the tool's longitudinal axis rather than extending the tool's length. This dimensional change allows the tool to maintain a compact length and diameter for deployment while still achieving large core sample dimensions during the coring operation.
4Productivity
If more energy is provided to the coring bit actuation system, then the coring operation becomes more efficient, but the energy consumption increases
Solution Approach 1:
Hydraulic actuation systems are used to provide high force and power for the coring operation with relatively compact components. Hydraulic systems are highly efficient at converting energy to mechanical work, providing the necessary actuation power while minimizing energy losses, thus improving coring efficiency without proportionally increasing energy consumption.
Solution Approach 2:
The actuation system parameters (pressure, flow rate, actuation timing) are optimized to match the specific coring requirements. By adjusting these parameters, the system delivers maximum energy efficiency at the point of need during coring operations, improving productivity while controlling overall energy consumption through precise parameter management.
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 solution enables core samples with increased length and diameter, enhancing the accuracy of formation evaluations and hydrocarbon reserve estimates by providing a larger testable volume, which is more suitable for laboratory analysis without the need for wrapping or padding.
Implementation Method 1
The gear drive, the key member, the pinion and the motor are configured to pivot in unison with the housing
Implementation Method 2
A selectively pivotable coring tool with a gear box-driven coring bit assembly
Implementation Method 3
a coring bit assembly having a cutting end
Implementation Method 4
The coring bit may extend and retract longitudinally through the coring aperture
Implementation Method 5
a series of pivotably connected extension link arms having a first end pivotably coupled to the bit housing and a second end pivotably coupled to the tool housing
Implementation Method 6
a first actuator operably coupled to the series of extension link arms and adapted to longitudinally translate the coring bit
Data Source
AI summary
A coring bit assembly for conveyance via wireline or drillstring in a wellbore extending into a subterranean formation. The coring bit assembly includes a coring shaft and a thrust ring coupled to an end of the coring shaft. A static sleeve is disposed inside the coring shaft and having a flange coupled to the thrust ring to space the static sleeve from the coring shaft to form a drilling fluid passageway between the coring shaft and the static sleeve. An axial fluid pump is disposed on the coring shaft to engage with the static sleeve to drive drilling fluid through the drilling fluid passageway formation.