Sidewall Coring Tool Fluid Flow for Heat and Cuttings Control
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Solution Overview
Problem
Mechanical sidewall coring tools face issues with heat build-up, cutter degradation, and inefficient cutting performance due to the lack of active fluid flow to remove cuttings, leading to bit stalling and reduced efficiency.
Innovation Solution
The implementation of a sidewall coring tool assembly with features such as scoops, internal grooves, fins, and cutout slots to create a defined and directed flow of drilling mud, facilitating the removal of cuttings and heat dissipation, thereby enhancing cutting efficiency and preventing bit stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hollow coring shaft design is used, then core sample extraction is achieved, but heat build-up and cutter degradation occur due to lack of active fluid flow
Solution Approach 1:
The patent introduces active fluid flow through the coring shaft using hydraulic principles. Fluid enters through inlet ports in the coring shaft and is directed through internal passages to the coring bit, creating forced convection that removes heat and cuttings from the cutting zone, preventing heat build-up and cutter degradation
Solution Approach 2:
The patent uses drilling fluid as an intermediary medium between the coring bit and the surrounding environment. The fluid acts as a heat sink and cuttings carrier, absorbing heat from the cutting zone and transporting cuttings away from the bit, thereby resolving the heat build-up problem without compromising cutter performance
2Productivity
If conventional coring bit design is used, then core cutting is achieved, but cutting efficiency is reduced due to debris accumulation
Solution Approach 1:
The patent employs hydraulic flow through the coring bit to actively remove cuttings from the cutting zone. The fluid flows through passages in the coring shaft and exits at the bit face, creating a directed flow that prevents debris accumulation and maintains high cutting efficiency throughout the coring operation
Solution Approach 2:
The patent converts the harmful effect of cuttings accumulation into a beneficial flushing action. By directing fluid flow through the coring shaft and bit, the system uses the presence of cuttings to drive fluid circulation, which then removes the cuttings, transforming the problem of debris accumulation into an active cleaning mechanism that sustains cutting efficiency
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 directed flow system increases cutting efficiency by up to 19-81% and reduces cutter degradation, ensuring effective core sample extraction with minimal debris accumulation.
Implementation Method 1
features such as scoops, internal grooves, fins, and cutout slots to create a defined and directed flow of drilling mud, facilitating the removal of cuttings
Implementation Method 2
facilitating the removal of cuttings and heat dissipation
Data Source
AI summary
Systems and methods presented herein include sidewall coring tool assemblies used to return core plugs of rock from a sidewall of a wellbore as part of a data collection exercise for exploration and production of hydrocarbons. A coring bit and a coring shaft of the present disclosure allow space for cuttings to move away from the bit face when drilling into a formation. In addition, certain embodiments include a plurality of inlets disposed circumferentially on an external surface at a first axial end of the coring shaft, a plurality of internal grooves disposed on an internal surface of the coring shaft, and/or a plurality of fins disposed on the external surface to direct flow of drilling and debris away from the coring bit. In addition to providing more space for cuttings to move away from the coring bit, the torque needed to drive the bit is lessened as the surface area of the bit contacting or engaging the formation is reduced.